Adds support to reply to Yaks with another voice message.

amethyst/src/main/AndroidManifest.xml

@@ -23,6 +23,9 @@
     <!-- To take pictures -->
     <uses-permission android:name="android.permission.CAMERA" />
 
+    <!-- To record audio messages -->
+    <uses-permission android:name="android.permission.RECORD_AUDIO" />
+
     <!-- To read NFCs that contain nostr:<NIP19> -->
     <uses-permission android:name="android.permission.NFC" />
 

amethyst/src/main/java/com/vitorpamplona/amethyst/model/Account.kt

@@ -204,6 +204,8 @@ import com.vitorpamplona.quartz.nip94FileMetadata.mimeType
 import com.vitorpamplona.quartz.nip94FileMetadata.originalHash
 import com.vitorpamplona.quartz.nip94FileMetadata.tags.DimensionTag
 import com.vitorpamplona.quartz.nip98HttpAuth.HTTPAuthorizationEvent
+import com.vitorpamplona.quartz.nipA0VoiceMessages.VoiceEvent
+import com.vitorpamplona.quartz.nipA0VoiceMessages.VoiceReplyEvent
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.DelicateCoroutinesApi
 import kotlinx.coroutines.Dispatchers
@@ -960,6 +962,27 @@ class Account(
         cache.getNoteIfExists(signedEvent.id)?.let { onReady(it) }
     }
 
+    suspend fun sendVoiceMessage(
+        url: String,
+        mimeType: String?,
+        hash: String,
+        duration: Int,
+        waveform: List<Int>,
+    ) {
+        signAndComputeBroadcast(VoiceEvent.build(url, mimeType, hash, duration, waveform))
+    }
+
+    suspend fun sendVoiceReplyMessage(
+        url: String,
+        mimeType: String?,
+        hash: String,
+        duration: Int,
+        waveform: List<Int>,
+        replyTo: EventHintBundle<VoiceEvent>,
+    ) {
+        signAndComputeBroadcast(VoiceReplyEvent.build(url, mimeType, hash, duration, waveform, replyTo))
+    }
+
     suspend fun sendAllAsOnePictureEvent(
         urlHeaderInfo: Map<String, FileHeader>,
         caption: String?,

amethyst/src/main/java/com/vitorpamplona/amethyst/model/LocalCache.kt

@@ -782,6 +782,8 @@ object LocalCache : ILocalCache {
             is TextNoteEvent -> event.tagsWithoutCitations().mapNotNull { checkGetOrCreateNote(it) }
             is CommentEvent -> event.tagsWithoutCitations().mapNotNull { checkGetOrCreateNote(it) }
 
+            is VoiceReplyEvent -> event.markedReplyTos().mapNotNull { checkGetOrCreateNote(it) }
+
             is ChatMessageEvent -> event.taggedEvents().mapNotNull { checkGetOrCreateNote(it) }
             is ChatMessageEncryptedFileHeaderEvent -> event.taggedEvents().mapNotNull { checkGetOrCreateNote(it) }
 

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/actions/uploads/RecordAudio.kt

@@ -0,0 +1,84 @@
+/**
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.amethyst.ui.actions.uploads
+
+import android.Manifest
+import android.widget.Toast
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
+import com.google.accompanist.permissions.ExperimentalPermissionsApi
+import com.google.accompanist.permissions.isGranted
+import com.google.accompanist.permissions.rememberPermissionState
+import com.vitorpamplona.amethyst.R
+import com.vitorpamplona.amethyst.ui.components.ClickAndHoldBoxComposable
+import com.vitorpamplona.amethyst.ui.stringRes
+
+@OptIn(ExperimentalPermissionsApi::class)
+@Composable
+fun RecordAudioBox(
+    modifier: Modifier,
+    onRecordTaken: (RecordingResult) -> Unit,
+    content: @Composable (Boolean) -> Unit,
+) {
+    val mediaRecorder = remember { mutableStateOf<VoiceMessageRecorder?>(null) }
+    val context = LocalContext.current
+
+    ClickAndHoldBoxComposable(
+        modifier = modifier,
+        onPress = {
+            val recordPermissionState = rememberPermissionState(Manifest.permission.RECORD_AUDIO)
+            val scope = rememberCoroutineScope()
+            LaunchedEffect(Unit) {
+                if (!recordPermissionState.status.isGranted) {
+                    recordPermissionState.launchPermissionRequest()
+                } else {
+                    mediaRecorder.value = VoiceMessageRecorder()
+                    mediaRecorder.value?.start(context, scope)
+                }
+            }
+        },
+        onRelease = {
+            val result = mediaRecorder.value?.stop()
+            if (result != null) {
+                onRecordTaken(result)
+            } else {
+                // less disruptive than error messages
+                Toast
+                    .makeText(
+                        context,
+                        stringRes(context, R.string.record_a_message_description),
+                        Toast.LENGTH_SHORT,
+                    ).show()
+            }
+        },
+        onCancel = {
+            mediaRecorder.value?.stop()
+        },
+        content,
+    )
+}

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/actions/uploads/TakePicture.kt

@@ -129,7 +129,7 @@ fun PictureButton(onClick: () -> Unit) {
     ) {
         Icon(
             imageVector = Icons.Default.CameraAlt,
-            contentDescription = stringRes(id = R.string.upload_image),
+            contentDescription = stringRes(id = R.string.take_a_picture),
             modifier = Modifier.height(22.dp),
             tint = MaterialTheme.colorScheme.onBackground,
         )

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/actions/uploads/VoiceMessageRecorder.kt

@@ -0,0 +1,106 @@
+/**
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.amethyst.ui.actions.uploads
+
+import android.content.Context
+import android.media.MediaRecorder
+import android.os.Build
+import androidx.media3.common.MimeTypes
+import com.vitorpamplona.quartz.utils.RandomInstance
+import com.vitorpamplona.quartz.utils.TimeUtils
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
+import java.io.File
+
+class RecordingResult(
+    val file: File,
+    val mimeType: String,
+    val amplitudes: List<Int>,
+    val duration: Int,
+)
+
+class VoiceMessageRecorder {
+    private var recorder: MediaRecorder? = null
+    private var outputFile: File? = null
+    private var startTime: Long = 0
+    private var job: Job? = null
+    private var amplitudes: MutableList<Int> = mutableListOf()
+
+    private fun createRecorder(context: Context): MediaRecorder =
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.S) {
+            MediaRecorder(context)
+        } else {
+            MediaRecorder()
+        }
+
+    suspend fun start(
+        context: Context,
+        scope: CoroutineScope,
+    ) {
+        val fileName = RandomInstance.randomChars(16) + ".mp4"
+        val outputFile = File(context.cacheDir, "/voice/$fileName")
+        outputFile.parentFile?.mkdirs()
+        this.outputFile = outputFile
+        this.startTime = TimeUtils.now()
+        this.amplitudes.clear()
+
+        createRecorder(context).apply {
+            setAudioSource(MediaRecorder.AudioSource.MIC)
+            setOutputFormat(MediaRecorder.OutputFormat.MPEG_4)
+            setAudioEncoder(MediaRecorder.AudioEncoder.AAC)
+            setOutputFile(outputFile)
+
+            prepare()
+            start()
+
+            recorder = this
+        }
+
+        job?.cancel()
+        job =
+            scope.launch {
+                while (recorder != null) {
+                    amplitudes.add(((recorder?.maxAmplitude ?: 0) / 100).toInt())
+                    delay(1000)
+                }
+            }
+    }
+
+    suspend fun stop(): RecordingResult? {
+        recorder?.stop()
+        recorder?.reset()
+        recorder = null
+        val currentTime = TimeUtils.now()
+        val file = outputFile
+        return if (currentTime - startTime >= 1 && file != null) {
+            RecordingResult(
+                file,
+                MimeTypes.AUDIO_AAC,
+                amplitudes,
+                (currentTime - startTime).toInt(),
+            )
+        } else {
+            null
+        }
+    }
+}

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/components/ClickableBox.kt

@@ -20,15 +20,29 @@
  */
 package com.vitorpamplona.amethyst.ui.components
 
+import android.R.attr.onClick
+import androidx.compose.animation.animateColorAsState
+import androidx.compose.animation.core.animateFloatAsState
+import androidx.compose.animation.core.tween
 import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.combinedClickable
 import androidx.compose.foundation.interaction.MutableInteractionSource
+import androidx.compose.foundation.interaction.PressInteraction
+import androidx.compose.foundation.interaction.collectIsPressedAsState
 import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.material3.MaterialTheme
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.scale
 import androidx.compose.ui.semantics.Role
 import com.vitorpamplona.amethyst.ui.theme.ripple24dp
 
@@ -51,6 +65,115 @@ fun ClickableBox(
     }
 }
 
+@Composable
+fun ClickAndHoldBox(
+    modifier: Modifier = Modifier,
+    onPress: () -> Unit,
+    onRelease: () -> Unit,
+    content: @Composable (Boolean) -> Unit,
+) {
+    val interactionSource = remember { MutableInteractionSource() }
+    val isPressed by interactionSource.collectIsPressedAsState()
+
+    LaunchedEffect(isPressed) {
+        if (isPressed) {
+            // Button is pressed
+            onPress()
+        } else {
+            // Button is released
+            onRelease()
+        }
+    }
+
+    // Animation for the button scale
+    val scale by animateFloatAsState(
+        targetValue = if (isPressed) 1.5f else 1.0f, // Scale up when recording
+        animationSpec = tween(durationMillis = 150), // Smooth animation
+    )
+
+    // Animation for the button color
+    val backgroundColor by animateColorAsState(
+        targetValue = if (isPressed) MaterialTheme.colorScheme.primary else MaterialTheme.colorScheme.background,
+        animationSpec = tween(durationMillis = 150),
+    )
+
+    Box(
+        modifier
+            .scale(scale)
+            .background(backgroundColor, CircleShape)
+            .clickable(
+                role = Role.Button,
+                interactionSource = interactionSource,
+                indication = ripple24dp,
+                onClick = { },
+            ),
+        contentAlignment = Alignment.Center,
+    ) {
+        content(isPressed)
+    }
+}
+
+@Composable
+fun ClickAndHoldBoxComposable(
+    modifier: Modifier = Modifier,
+    onPress: @Composable () -> Unit,
+    onRelease: suspend () -> Unit,
+    onCancel: suspend () -> Unit,
+    content: @Composable (Boolean) -> Unit,
+) {
+    val interactionSource = remember { MutableInteractionSource() }
+    var isPressed by remember { mutableStateOf(false) }
+
+    if (isPressed) {
+        onPress()
+    }
+
+    LaunchedEffect(interactionSource) {
+        val pressInteractions = mutableListOf<PressInteraction.Press>()
+        interactionSource.interactions.collect { interaction ->
+            when (interaction) {
+                is PressInteraction.Press -> pressInteractions.add(interaction)
+                is PressInteraction.Release -> {
+                    onRelease()
+                    pressInteractions.remove(interaction.press)
+                }
+                is PressInteraction.Cancel -> {
+                    onCancel()
+                    pressInteractions.remove(interaction.press)
+                }
+            }
+            isPressed = pressInteractions.isNotEmpty()
+        }
+    }
+
+    // Animation for the button scale
+    val scale by animateFloatAsState(
+        targetValue = if (isPressed) 1.5f else 1.0f, // Scale up when recording
+        animationSpec = tween(durationMillis = 150), // Smooth animation
+    )
+
+    // Animation for the button color
+    val backgroundColor by animateColorAsState(
+        targetValue = if (isPressed) MaterialTheme.colorScheme.primary else MaterialTheme.colorScheme.background,
+        animationSpec = tween(durationMillis = 150),
+    )
+
+    Box(
+        modifier
+            .scale(scale)
+            .background(backgroundColor, CircleShape)
+            .clickable(
+                role = Role.Button,
+                interactionSource = interactionSource,
+                indication = ripple24dp,
+                onClick = { },
+            ),
+        contentAlignment = Alignment.Center,
+    ) {
+        content(isPressed)
+    }
+}
+
 @OptIn(ExperimentalFoundationApi::class)
 @Composable
 fun ClickableBox(

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/navigation/AppNavigation.kt

@@ -78,6 +78,7 @@ import com.vitorpamplona.amethyst.ui.screen.loggedIn.hashtag.HashtagScreen
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.home.HomeScreen
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.home.ShortNotePostScreen
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.notifications.NotificationScreen
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.notifications.publicMessages.NewPublicMessageScreen
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.privacy.PrivacyOptionsScreen
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.profile.ProfileScreen
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.redirect.LoadRedirectScreen
@@ -172,6 +173,14 @@ fun AppNavigation(
                 )
             }
 
+            composableFromBottomArgs<Route.NewPublicMessage> {
+                NewPublicMessageScreen(
+                    to = it.toKey(),
+                    accountViewModel,
+                    nav,
+                )
+            }
+
             composableFromBottomArgs<Route.HashtagPost> {
                 HashtagPostScreen(
                     hashtag = it.hashtag,

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/navigation/routes/RouteMaker.kt

@@ -29,6 +29,7 @@ import com.vitorpamplona.amethyst.model.nip28PublicChats.PublicChatChannel
 import com.vitorpamplona.amethyst.model.nip53LiveActivities.LiveActivitiesChannel
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
 import com.vitorpamplona.quartz.experimental.ephemChat.chat.RoomId
+import com.vitorpamplona.quartz.experimental.publicMessages.PublicMessageEvent
 import com.vitorpamplona.quartz.nip01Core.core.AddressableEvent
 import com.vitorpamplona.quartz.nip01Core.core.Event
 import com.vitorpamplona.quartz.nip01Core.core.HexKey
@@ -200,6 +201,7 @@ fun routeReplyTo(
 ): Route? {
     val noteEvent = note.event
     return when (noteEvent) {
+        is PublicMessageEvent -> Route.NewPublicMessage(noteEvent.groupKeySet() - account.userProfile().pubkeyHex)
         is TextNoteEvent -> Route.NewPost(baseReplyTo = note.idHex)
         is PrivateDmEvent ->
             routeToMessage(

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/navigation/routes/Routes.kt

@@ -138,6 +138,16 @@ sealed class Route {
         fun toKey(): ChatroomKey = ChatroomKey(id.split(",").toSet())
     }
 
+    @Serializable data class NewPublicMessage(
+        val to: String,
+    ) : Route() {
+        constructor(users: Set<HexKey>) : this(
+            to = users.joinToString(","),
+        )
+
+        fun toKey(): Set<HexKey> = to.split(",").toSet()
+    }
+
     @Serializable data class RoomByAuthor(
         val id: String,
     ) : Route()

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/Icons.kt

@@ -39,6 +39,7 @@ import androidx.compose.material.icons.filled.PushPin
 import androidx.compose.material.icons.filled.Share
 import androidx.compose.material.icons.outlined.AddReaction
 import androidx.compose.material.icons.outlined.Close
+import androidx.compose.material.icons.outlined.Mic
 import androidx.compose.material.icons.outlined.PlayCircle
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
@@ -314,6 +315,19 @@ fun ExpandMoreIcon(
     )
 }
 
+@Composable
+fun VoiceReplyIcon(
+    iconSizeModifier: Modifier,
+    tint: Color,
+) {
+    Icon(
+        imageVector = Icons.Outlined.Mic,
+        contentDescription = stringRes(id = R.string.record_a_message),
+        tint = tint,
+        modifier = iconSizeModifier,
+    )
+}
+
 @Composable
 fun CommentIcon(
     iconSizeModifier: Modifier,

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/note/ReactionsRow.kt

@@ -93,6 +93,7 @@ import androidx.compose.ui.unit.sp
 import androidx.compose.ui.window.Popup
 import androidx.compose.ui.window.PopupProperties
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
+import com.google.accompanist.permissions.ExperimentalPermissionsApi
 import com.vitorpamplona.amethyst.R
 import com.vitorpamplona.amethyst.commons.emojicoder.EmojiCoder
 import com.vitorpamplona.amethyst.model.FeatureSetType
@@ -109,6 +110,7 @@ import com.vitorpamplona.amethyst.service.relayClient.reqCommand.event.observeNo
 import com.vitorpamplona.amethyst.service.relayClient.reqCommand.event.observeNoteZaps
 import com.vitorpamplona.amethyst.service.relayClient.reqCommand.nwc.NWCFinderFilterAssemblerSubscription
 import com.vitorpamplona.amethyst.ui.actions.CrossfadeIfEnabled
+import com.vitorpamplona.amethyst.ui.actions.uploads.RecordAudioBox
 import com.vitorpamplona.amethyst.ui.components.AnimatedBorderTextCornerRadius
 import com.vitorpamplona.amethyst.ui.components.ClickableBox
 import com.vitorpamplona.amethyst.ui.components.GenericLoadable
@@ -156,6 +158,7 @@ import com.vitorpamplona.quartz.nip10Notes.BaseThreadedEvent
 import com.vitorpamplona.quartz.nip17Dm.base.ChatroomKeyable
 import com.vitorpamplona.quartz.nip30CustomEmoji.CustomEmoji
 import com.vitorpamplona.quartz.nip57Zaps.zapraiser.zapraiserAmount
+import com.vitorpamplona.quartz.nipA0VoiceMessages.BaseVoiceEvent
 import kotlinx.collections.immutable.ImmutableList
 import kotlinx.collections.immutable.ImmutableSet
 import kotlinx.collections.immutable.persistentListOf
@@ -578,8 +581,37 @@ private fun ReplyReactionWithDialog(
     accountViewModel: AccountViewModel,
     nav: INav,
 ) {
-    ReplyReaction(baseNote, grayTint, accountViewModel) {
+    if (baseNote.event is BaseVoiceEvent) {
-        nav.nav { routeReplyTo(baseNote, accountViewModel.account) }
+        ReplyViaVoiceReaction(baseNote, grayTint, accountViewModel)
+    } else {
+        ReplyReaction(baseNote, grayTint, accountViewModel) {
+            nav.nav { routeReplyTo(baseNote, accountViewModel.account) }
+        }
+    }
+}
+
+@OptIn(ExperimentalPermissionsApi::class)
+@Composable
+fun ReplyViaVoiceReaction(
+    baseNote: Note,
+    grayTint: Color,
+    accountViewModel: AccountViewModel,
+    showCounter: Boolean = true,
+    iconSizeModifier: Modifier = Size19Modifier,
+) {
+    val context = LocalContext.current
+
+    RecordAudioBox(
+        modifier = iconSizeModifier,
+        onRecordTaken = { audio ->
+            accountViewModel.sendVoiceReply(baseNote, audio, context)
+        },
+    ) {
+        VoiceReplyIcon(iconSizeModifier, grayTint)
+    }
+
+    if (showCounter) {
+        ReplyCounter(baseNote, grayTint, accountViewModel)
     }
 }
 

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/AccountViewModel.kt

@@ -28,6 +28,7 @@ import android.util.LruCache
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.Immutable
 import androidx.compose.runtime.Stable
+import androidx.core.net.toUri
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.ViewModelProvider
 import androidx.lifecycle.viewModelScope
@@ -65,8 +66,12 @@ import com.vitorpamplona.amethyst.service.cashu.CashuToken
 import com.vitorpamplona.amethyst.service.cashu.melt.MeltProcessor
 import com.vitorpamplona.amethyst.service.checkNotInMainThread
 import com.vitorpamplona.amethyst.service.lnurl.LightningAddressResolver
+import com.vitorpamplona.amethyst.service.uploads.CompressorQuality
+import com.vitorpamplona.amethyst.service.uploads.UploadOrchestrator
+import com.vitorpamplona.amethyst.service.uploads.UploadingState
 import com.vitorpamplona.amethyst.ui.actions.Dao
 import com.vitorpamplona.amethyst.ui.actions.MediaSaverToDisk
+import com.vitorpamplona.amethyst.ui.actions.uploads.RecordingResult
 import com.vitorpamplona.amethyst.ui.components.UrlPreviewState
 import com.vitorpamplona.amethyst.ui.components.toasts.ToastManager
 import com.vitorpamplona.amethyst.ui.feeds.FeedState
@@ -104,6 +109,7 @@ import com.vitorpamplona.quartz.nip19Bech32.bech32.bechToBytes
 import com.vitorpamplona.quartz.nip19Bech32.entities.NAddress
 import com.vitorpamplona.quartz.nip19Bech32.entities.NEmbed
 import com.vitorpamplona.quartz.nip19Bech32.entities.NEvent
+import com.vitorpamplona.quartz.nip19Bech32.entities.NNote
 import com.vitorpamplona.quartz.nip19Bech32.entities.NProfile
 import com.vitorpamplona.quartz.nip19Bech32.entities.NPub
 import com.vitorpamplona.quartz.nip19Bech32.entities.NRelay
@@ -123,6 +129,7 @@ import com.vitorpamplona.quartz.nip59Giftwrap.wraps.GiftWrapEvent
 import com.vitorpamplona.quartz.nip65RelayList.AdvertisedRelayListEvent
 import com.vitorpamplona.quartz.nip90Dvms.NIP90ContentDiscoveryResponseEvent
 import com.vitorpamplona.quartz.nip94FileMetadata.tags.DimensionTag
+import com.vitorpamplona.quartz.nipA0VoiceMessages.VoiceEvent
 import com.vitorpamplona.quartz.utils.Hex
 import com.vitorpamplona.quartz.utils.TimeUtils
 import com.vitorpamplona.quartz.utils.mapNotNullAsync
@@ -1249,6 +1256,54 @@ class AccountViewModel(
         super.onCleared()
     }
 
+    fun sendVoiceReply(
+        note: Note,
+        recording: RecordingResult,
+        context: Context,
+    ) {
+        if (isWriteable()) {
+            val hint = note.toEventHint<VoiceEvent>()
+            if (hint == null) return
+
+            runIOCatching {
+                val uploader = UploadOrchestrator()
+                val result =
+                    uploader.upload(
+                        uri = recording.file.toUri(),
+                        mimeType = recording.mimeType,
+                        alt = null,
+                        contentWarningReason = null,
+                        compressionQuality = CompressorQuality.UNCOMPRESSED,
+                        server = account.settings.defaultFileServer,
+                        account = account,
+                        context = context,
+                    )
+
+                if (result is UploadingState.Finished && result.result is UploadOrchestrator.OrchestratorResult.ServerResult) {
+                    account.sendVoiceReplyMessage(
+                        result.result.url,
+                        result.result.fileHeader.mimeType ?: recording.mimeType,
+                        result.result.fileHeader.hash,
+                        recording.duration,
+                        recording.amplitudes,
+                        hint,
+                    )
+                } else if (result is UploadingState.Error) {
+                    toastManager.toast(
+                        R.string.failed_to_upload_media_no_details,
+                        result.errorResource,
+                        *result.params,
+                    )
+                }
+            }
+        } else {
+            toastManager.toast(
+                R.string.read_only_user,
+                R.string.login_with_a_private_key_to_be_able_to_reply,
+            )
+        }
+    }
+
     fun loadThumb(
         context: Context,
         thumbUri: String,
@@ -1673,7 +1728,7 @@ class AccountViewModel(
                         is NSec -> {}
                         is NPub -> {}
                         is NProfile -> {}
-                        is com.vitorpamplona.quartz.nip19Bech32.entities.NNote -> {
+                        is NNote -> {
                             LocalCache.checkGetOrCreateNote(parsed.hex)?.let { note ->
                                 returningNote = note
                             }

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/notifications/publicMessages/NewPublicMessageScreen.kt

@@ -0,0 +1,379 @@
+/**
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.amethyst.ui.screen.loggedIn.notifications.publicMessages
+
+import androidx.compose.foundation.horizontalScroll
+import androidx.compose.foundation.layout.Arrangement.Absolute.spacedBy
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.consumeWindowInsets
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.heightIn
+import androidx.compose.foundation.layout.imePadding
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.HorizontalDivider
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedTextFieldDefaults
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment.Companion.CenterVertically
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.focusRequester
+import androidx.compose.ui.focus.onFocusChanged
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.LocalSoftwareKeyboardController
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.viewmodel.compose.viewModel
+import com.vitorpamplona.amethyst.R
+import com.vitorpamplona.amethyst.ui.actions.UrlUserTagTransformation
+import com.vitorpamplona.amethyst.ui.actions.mediaServers.ServerType
+import com.vitorpamplona.amethyst.ui.actions.uploads.SelectFromGallery
+import com.vitorpamplona.amethyst.ui.actions.uploads.TakePictureButton
+import com.vitorpamplona.amethyst.ui.components.ThinPaddingTextField
+import com.vitorpamplona.amethyst.ui.navigation.navs.INav
+import com.vitorpamplona.amethyst.ui.navigation.navs.Nav
+import com.vitorpamplona.amethyst.ui.navigation.topbars.PostingTopBar
+import com.vitorpamplona.amethyst.ui.note.creators.contentWarning.ContentSensitivityExplainer
+import com.vitorpamplona.amethyst.ui.note.creators.contentWarning.MarkAsSensitiveButton
+import com.vitorpamplona.amethyst.ui.note.creators.emojiSuggestions.ShowEmojiSuggestionList
+import com.vitorpamplona.amethyst.ui.note.creators.emojiSuggestions.WatchAndLoadMyEmojiList
+import com.vitorpamplona.amethyst.ui.note.creators.invoice.AddLnInvoiceButton
+import com.vitorpamplona.amethyst.ui.note.creators.invoice.NewPostInvoiceRequest
+import com.vitorpamplona.amethyst.ui.note.creators.location.AddGeoHashButton
+import com.vitorpamplona.amethyst.ui.note.creators.location.LocationAsHash
+import com.vitorpamplona.amethyst.ui.note.creators.previews.DisplayPreviews
+import com.vitorpamplona.amethyst.ui.note.creators.secretEmoji.AddSecretEmojiButton
+import com.vitorpamplona.amethyst.ui.note.creators.secretEmoji.SecretEmojiRequest
+import com.vitorpamplona.amethyst.ui.note.creators.uploads.ImageVideoDescription
+import com.vitorpamplona.amethyst.ui.note.creators.userSuggestions.ShowUserSuggestionList
+import com.vitorpamplona.amethyst.ui.note.creators.zapraiser.AddZapraiserButton
+import com.vitorpamplona.amethyst.ui.note.creators.zapraiser.ZapRaiserRequest
+import com.vitorpamplona.amethyst.ui.note.creators.zapsplits.ForwardZapTo
+import com.vitorpamplona.amethyst.ui.note.creators.zapsplits.ForwardZapToButton
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.privateDM.send.MessageFieldRow
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.privateDM.send.SendDirectMessageTo
+import com.vitorpamplona.amethyst.ui.stringRes
+import com.vitorpamplona.amethyst.ui.theme.DividerThickness
+import com.vitorpamplona.amethyst.ui.theme.Font14SP
+import com.vitorpamplona.amethyst.ui.theme.Size10dp
+import com.vitorpamplona.amethyst.ui.theme.Size5dp
+import com.vitorpamplona.amethyst.ui.theme.placeholderText
+import com.vitorpamplona.quartz.nip01Core.core.HexKey
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.FlowPreview
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
+
+@OptIn(ExperimentalMaterial3Api::class, FlowPreview::class)
+@Composable
+fun NewPublicMessageScreen(
+    to: Set<HexKey>? = null,
+    accountViewModel: AccountViewModel,
+    nav: Nav,
+) {
+    val postViewModel: NewPublicMessageViewModel = viewModel()
+    postViewModel.init(accountViewModel)
+
+    LaunchedEffect(Unit) {
+        withContext(Dispatchers.IO) {
+            to?.let {
+                postViewModel.load(it)
+            }
+        }
+    }
+
+    WatchAndLoadMyEmojiList(accountViewModel)
+
+    Scaffold(
+        topBar = {
+            PostingTopBar(
+                titleRes = R.string.public_message,
+                isActive = postViewModel::canPost,
+                onCancel = {
+                    // uses the accountViewModel scope to avoid cancelling this
+                    // function when the postViewModel is released
+                    accountViewModel.runIOCatching {
+                        postViewModel.sendDraftSync()
+                        delay(100)
+                        nav.popBack()
+                        postViewModel.cancel()
+                    }
+                },
+                onPost = {
+                    // uses the accountViewModel scope to avoid cancelling this
+                    // function when the postViewModel is released
+                    accountViewModel.runIOCatching {
+                        postViewModel.sendPostSync()
+                        nav.popBack()
+                        postViewModel.cancel()
+                    }
+                    nav.popBack()
+                },
+            )
+        },
+    ) { pad ->
+        Surface(
+            modifier =
+                Modifier
+                    .padding(pad)
+                    .consumeWindowInsets(pad)
+                    .imePadding(),
+        ) {
+            PublicMessageScreenContent(postViewModel, accountViewModel, nav)
+        }
+    }
+}
+
+@Composable
+fun PublicMessageScreenContent(
+    postViewModel: NewPublicMessageViewModel,
+    accountViewModel: AccountViewModel,
+    nav: INav,
+) {
+    val scrollState = rememberScrollState()
+
+    Column(Modifier.fillMaxSize()) {
+        Row(Modifier.fillMaxWidth().padding(horizontal = Size10dp).weight(1f)) {
+            Column(
+                Modifier.fillMaxWidth().verticalScroll(scrollState),
+                verticalArrangement = spacedBy(Size10dp),
+            ) {
+                SendDirectMessageTo(postViewModel, accountViewModel)
+
+                MessageFieldRow(postViewModel, accountViewModel)
+
+                DisplayPreviews(postViewModel.urlPreviews, accountViewModel, nav)
+
+                if (postViewModel.wantsToMarkAsSensitive) {
+                    ContentSensitivityExplainer()
+                }
+
+                if (postViewModel.wantsToAddGeoHash) {
+                    LocationAsHash(postViewModel)
+                }
+
+                if (postViewModel.wantsForwardZapTo) {
+                    ForwardZapTo(postViewModel, accountViewModel)
+                }
+
+                postViewModel.multiOrchestrator?.let {
+                    Row(
+                        verticalAlignment = CenterVertically,
+                        modifier = Modifier.padding(vertical = Size5dp, horizontal = Size10dp),
+                    ) {
+                        val context = LocalContext.current
+                        ImageVideoDescription(
+                            it,
+                            accountViewModel.account.settings.defaultFileServer,
+                            onAdd = { alt, server, sensitiveContent, mediaQuality ->
+                                postViewModel.upload(alt, if (sensitiveContent) "" else null, mediaQuality, server, accountViewModel.toastManager::toast, context)
+                                if (server.type != ServerType.NIP95) {
+                                    accountViewModel.account.settings.changeDefaultFileServer(server)
+                                }
+                            },
+                            onDelete = postViewModel::deleteMediaToUpload,
+                            onCancel = { postViewModel.multiOrchestrator = null },
+                            accountViewModel = accountViewModel,
+                        )
+                    }
+                }
+
+                if (postViewModel.wantsInvoice) {
+                    NewPostInvoiceRequest(
+                        onSuccess = {
+                            postViewModel.insertAtCursor(it)
+                            postViewModel.wantsInvoice = false
+                        },
+                        accountViewModel,
+                    )
+                }
+
+                if (postViewModel.wantsSecretEmoji) {
+                    SecretEmojiRequest {
+                        postViewModel.insertAtCursor(it)
+                        postViewModel.wantsSecretEmoji = false
+                    }
+                }
+
+                if (postViewModel.wantsZapraiser && postViewModel.hasLnAddress()) {
+                    ZapRaiserRequest(
+                        stringRes(id = R.string.zapraiser),
+                        postViewModel,
+                    )
+                }
+            }
+        }
+
+        postViewModel.userSuggestions?.let {
+            ShowUserSuggestionList(
+                it,
+                postViewModel::autocompleteWithUser,
+                accountViewModel,
+                Modifier.heightIn(0.dp, 300.dp),
+            )
+        }
+
+        postViewModel.emojiSuggestions?.let {
+            ShowEmojiSuggestionList(
+                it,
+                postViewModel::autocompleteWithEmoji,
+                postViewModel::autocompleteWithEmojiUrl,
+                accountViewModel,
+                Modifier.heightIn(0.dp, 300.dp),
+            )
+        }
+
+        BottomRowActions(postViewModel, accountViewModel)
+    }
+}
+
+@Composable
+private fun BottomRowActions(
+    postViewModel: NewPublicMessageViewModel,
+    accountViewModel: AccountViewModel,
+) {
+    val scrollState = rememberScrollState()
+    Row(
+        modifier =
+            Modifier
+                .horizontalScroll(scrollState)
+                .fillMaxWidth()
+                .height(50.dp),
+        verticalAlignment = CenterVertically,
+    ) {
+        SelectFromGallery(
+            isUploading = postViewModel.isUploadingImage,
+            tint = MaterialTheme.colorScheme.onBackground,
+            modifier = Modifier,
+        ) {
+            postViewModel.selectImage(it)
+        }
+
+        TakePictureButton(
+            onPictureTaken = {
+                postViewModel.selectImage(it)
+            },
+        )
+
+        ForwardZapToButton(postViewModel.wantsForwardZapTo) {
+            postViewModel.wantsForwardZapTo = !postViewModel.wantsForwardZapTo
+        }
+
+        if (postViewModel.canAddZapRaiser) {
+            AddZapraiserButton(postViewModel.wantsZapraiser) {
+                postViewModel.wantsZapraiser = !postViewModel.wantsZapraiser
+            }
+        }
+
+        MarkAsSensitiveButton(postViewModel.wantsToMarkAsSensitive) {
+            postViewModel.toggleMarkAsSensitive()
+        }
+
+        AddGeoHashButton(postViewModel.wantsToAddGeoHash) {
+            postViewModel.wantsToAddGeoHash = !postViewModel.wantsToAddGeoHash
+        }
+
+        AddSecretEmojiButton(postViewModel.wantsSecretEmoji) {
+            postViewModel.wantsSecretEmoji = !postViewModel.wantsSecretEmoji
+        }
+
+        if (postViewModel.canAddInvoice && postViewModel.hasLnAddress()) {
+            AddLnInvoiceButton(postViewModel.wantsInvoice) {
+                postViewModel.wantsInvoice = !postViewModel.wantsInvoice
+            }
+        }
+    }
+}
+
+@Composable
+fun SendDirectMessageTo(
+    postViewModel: NewPublicMessageViewModel,
+    accountViewModel: AccountViewModel,
+) {
+    val focusRequester = remember { FocusRequester() }
+    val keyboardController = LocalSoftwareKeyboardController.current
+
+    LaunchedEffect(Unit) {
+        launch {
+            delay(200)
+            focusRequester.requestFocus()
+        }
+    }
+
+    Column(Modifier.fillMaxWidth()) {
+        Row(
+            verticalAlignment = CenterVertically,
+            modifier = Modifier.fillMaxWidth(),
+        ) {
+            Text(
+                text = stringRes(R.string.messages_new_message_to),
+                fontSize = Font14SP,
+                fontWeight = FontWeight.W500,
+            )
+
+            ThinPaddingTextField(
+                value = postViewModel.toUsers,
+                onValueChange = postViewModel::updateToUsers,
+                modifier =
+                    Modifier
+                        .weight(1f)
+                        .focusRequester(focusRequester)
+                        .onFocusChanged {
+                            if (it.isFocused) {
+                                keyboardController?.show()
+                            }
+                        },
+                placeholder = {
+                    Text(
+                        text = stringRes(R.string.messages_new_message_to_caption),
+                        color = MaterialTheme.colorScheme.placeholderText,
+                    )
+                },
+                visualTransformation =
+                    UrlUserTagTransformation(
+                        MaterialTheme.colorScheme.primary,
+                    ),
+                colors =
+                    OutlinedTextFieldDefaults.colors(
+                        unfocusedBorderColor = Color.Transparent,
+                        focusedBorderColor = Color.Transparent,
+                    ),
+            )
+        }
+
+        HorizontalDivider(thickness = DividerThickness)
+    }
+}

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/notifications/publicMessages/NewPublicMessageViewModel.kt

@@ -0,0 +1,644 @@
+/**
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.amethyst.ui.screen.loggedIn.notifications.publicMessages
+
+import android.content.Context
+import android.util.Log
+import androidx.compose.runtime.Stable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.text.input.TextFieldValue
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.vitorpamplona.amethyst.Amethyst
+import com.vitorpamplona.amethyst.R
+import com.vitorpamplona.amethyst.commons.compose.currentWord
+import com.vitorpamplona.amethyst.commons.compose.insertUrlAtCursor
+import com.vitorpamplona.amethyst.commons.compose.replaceCurrentWord
+import com.vitorpamplona.amethyst.model.Account
+import com.vitorpamplona.amethyst.model.LocalCache
+import com.vitorpamplona.amethyst.model.Note
+import com.vitorpamplona.amethyst.model.User
+import com.vitorpamplona.amethyst.model.nip30CustomEmojis.EmojiPackState
+import com.vitorpamplona.amethyst.service.location.LocationState
+import com.vitorpamplona.amethyst.service.uploads.MediaCompressor
+import com.vitorpamplona.amethyst.service.uploads.MultiOrchestrator
+import com.vitorpamplona.amethyst.service.uploads.UploadOrchestrator
+import com.vitorpamplona.amethyst.ui.actions.NewMessageTagger
+import com.vitorpamplona.amethyst.ui.actions.mediaServers.ServerName
+import com.vitorpamplona.amethyst.ui.actions.uploads.SelectedMedia
+import com.vitorpamplona.amethyst.ui.actions.uploads.SelectedMediaProcessing
+import com.vitorpamplona.amethyst.ui.note.creators.draftTags.DraftTagState
+import com.vitorpamplona.amethyst.ui.note.creators.emojiSuggestions.EmojiSuggestionState
+import com.vitorpamplona.amethyst.ui.note.creators.location.ILocationGrabber
+import com.vitorpamplona.amethyst.ui.note.creators.messagefield.IMessageField
+import com.vitorpamplona.amethyst.ui.note.creators.previews.PreviewState
+import com.vitorpamplona.amethyst.ui.note.creators.userSuggestions.UserSuggestionState
+import com.vitorpamplona.amethyst.ui.note.creators.zapraiser.IZapRaiser
+import com.vitorpamplona.amethyst.ui.note.creators.zapsplits.IZapField
+import com.vitorpamplona.amethyst.ui.note.creators.zapsplits.SplitBuilder
+import com.vitorpamplona.amethyst.ui.note.creators.zapsplits.toZapSplitSetup
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.chats.privateDM.send.IMetaAttachments
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.home.UserSuggestionAnchor
+import com.vitorpamplona.amethyst.ui.stringRes
+import com.vitorpamplona.quartz.experimental.nip95.data.FileStorageEvent
+import com.vitorpamplona.quartz.experimental.nip95.header.FileStorageHeaderEvent
+import com.vitorpamplona.quartz.experimental.publicMessages.PublicMessageEvent
+import com.vitorpamplona.quartz.experimental.publicMessages.tags.ReceiverTag
+import com.vitorpamplona.quartz.nip01Core.core.AddressableEvent
+import com.vitorpamplona.quartz.nip01Core.core.Event
+import com.vitorpamplona.quartz.nip01Core.core.HexKey
+import com.vitorpamplona.quartz.nip01Core.signers.EventTemplate
+import com.vitorpamplona.quartz.nip01Core.signers.SignerExceptions
+import com.vitorpamplona.quartz.nip01Core.tags.geohash.geohash
+import com.vitorpamplona.quartz.nip01Core.tags.geohash.getGeoHash
+import com.vitorpamplona.quartz.nip01Core.tags.hashtags.hashtags
+import com.vitorpamplona.quartz.nip01Core.tags.references.references
+import com.vitorpamplona.quartz.nip10Notes.content.findHashtags
+import com.vitorpamplona.quartz.nip10Notes.content.findNostrUris
+import com.vitorpamplona.quartz.nip10Notes.content.findURLs
+import com.vitorpamplona.quartz.nip18Reposts.quotes.quotes
+import com.vitorpamplona.quartz.nip18Reposts.quotes.taggedQuoteIds
+import com.vitorpamplona.quartz.nip19Bech32.toNpub
+import com.vitorpamplona.quartz.nip30CustomEmoji.CustomEmoji
+import com.vitorpamplona.quartz.nip30CustomEmoji.EmojiUrlTag
+import com.vitorpamplona.quartz.nip30CustomEmoji.emojis
+import com.vitorpamplona.quartz.nip36SensitiveContent.contentWarning
+import com.vitorpamplona.quartz.nip36SensitiveContent.isSensitive
+import com.vitorpamplona.quartz.nip37Drafts.DraftEvent
+import com.vitorpamplona.quartz.nip57Zaps.splits.ZapSplitSetup
+import com.vitorpamplona.quartz.nip57Zaps.splits.zapSplitSetup
+import com.vitorpamplona.quartz.nip57Zaps.splits.zapSplits
+import com.vitorpamplona.quartz.nip57Zaps.zapraiser.zapraiser
+import com.vitorpamplona.quartz.nip57Zaps.zapraiser.zapraiserAmount
+import com.vitorpamplona.quartz.nip92IMeta.IMetaTagBuilder
+import com.vitorpamplona.quartz.nip92IMeta.imetas
+import com.vitorpamplona.quartz.nip94FileMetadata.alt
+import com.vitorpamplona.quartz.nip94FileMetadata.blurhash
+import com.vitorpamplona.quartz.nip94FileMetadata.dims
+import com.vitorpamplona.quartz.nip94FileMetadata.hash
+import com.vitorpamplona.quartz.nip94FileMetadata.magnet
+import com.vitorpamplona.quartz.nip94FileMetadata.mimeType
+import com.vitorpamplona.quartz.nip94FileMetadata.originalHash
+import com.vitorpamplona.quartz.nip94FileMetadata.sensitiveContent
+import com.vitorpamplona.quartz.nip94FileMetadata.size
+import com.vitorpamplona.quartz.utils.Hex
+import kotlinx.collections.immutable.ImmutableList
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.collectLatest
+import kotlinx.coroutines.launch
+import kotlin.collections.plus
+
+@Stable
+class NewPublicMessageViewModel :
+    ViewModel(),
+    ILocationGrabber,
+    IMessageField,
+    IZapField,
+    IZapRaiser {
+    val draftTag = DraftTagState()
+
+    lateinit var accountViewModel: AccountViewModel
+    lateinit var account: Account
+
+    init {
+        viewModelScope.launch(Dispatchers.IO) {
+            draftTag.versions.collectLatest {
+                // don't save the first
+                if (it > 0) {
+                    sendDraftSync()
+                }
+            }
+        }
+    }
+
+    val iMetaAttachments = IMetaAttachments()
+    var nip95attachments by mutableStateOf<List<Pair<FileStorageEvent, FileStorageHeaderEvent>>>(emptyList())
+
+    override var message by mutableStateOf(TextFieldValue(""))
+
+    val urlPreviews = PreviewState()
+
+    var isUploadingImage by mutableStateOf(false)
+
+    var userSuggestions: UserSuggestionState? = null
+    var userSuggestionsMainMessage: UserSuggestionAnchor? = null
+
+    var emojiSuggestions: EmojiSuggestionState? = null
+
+    var toUsers by mutableStateOf(TextFieldValue(""))
+
+    // Images and Videos
+    var multiOrchestrator by mutableStateOf<MultiOrchestrator?>(null)
+
+    // Invoices
+    var canAddInvoice by mutableStateOf(false)
+    var wantsInvoice by mutableStateOf(false)
+
+    var wantsSecretEmoji by mutableStateOf(false)
+
+    // Forward Zap to
+    var wantsForwardZapTo by mutableStateOf(false)
+    override val forwardZapTo = mutableStateOf<SplitBuilder<User>>(SplitBuilder())
+    override val forwardZapToEditting = mutableStateOf(TextFieldValue(""))
+
+    // NSFW, Sensitive
+    var wantsToMarkAsSensitive by mutableStateOf(false)
+
+    // GeoHash
+    var wantsToAddGeoHash by mutableStateOf(false)
+    var location: StateFlow<LocationState.LocationResult>? = null
+
+    // ZapRaiser
+    var canAddZapRaiser by mutableStateOf(false)
+    var wantsZapraiser by mutableStateOf(false)
+    override var zapRaiserAmount = mutableStateOf<Long?>(null)
+
+    fun lnAddress(): String? = account.userProfile().info?.lnAddress()
+
+    fun hasLnAddress(): Boolean = account.userProfile().info?.lnAddress() != null
+
+    fun user(): User? = account.userProfile()
+
+    fun init(accountVM: AccountViewModel) {
+        this.accountViewModel = accountVM
+        this.account = accountVM.account
+        this.canAddInvoice = hasLnAddress()
+        this.canAddZapRaiser = hasLnAddress()
+
+        this.userSuggestions?.reset()
+        this.userSuggestions = UserSuggestionState(accountVM)
+
+        this.emojiSuggestions?.reset()
+        this.emojiSuggestions = EmojiSuggestionState(accountVM)
+    }
+
+    fun load(users: Set<HexKey>) {
+        val userSet = users - account.userProfile().pubkeyHex
+
+        toUsers =
+            TextFieldValue(
+                userSet.mapNotNull { runCatching { Hex.decode(it).toNpub() }.getOrNull() }.joinToString(", ") { "@$it" },
+            )
+    }
+
+    fun quote(quote: Note) {
+        message = TextFieldValue(message.text + "\nnostr:${quote.toNEvent()}")
+        urlPreviews.update(message)
+
+        // creates a split with that author.
+        val quotedAuthor = quote.author ?: return
+
+        if (quotedAuthor.pubkeyHex != accountViewModel.userProfile().pubkeyHex) {
+            if (forwardZapTo.value.items.none { it.key.pubkeyHex == quotedAuthor.pubkeyHex }) {
+                forwardZapTo.value.addItem(quotedAuthor)
+            }
+            if (forwardZapTo.value.items.none { it.key.pubkeyHex == accountViewModel.userProfile().pubkeyHex }) {
+                forwardZapTo.value.addItem(accountViewModel.userProfile())
+            }
+
+            val pos = forwardZapTo.value.items.indexOfFirst { it.key.pubkeyHex == quotedAuthor.pubkeyHex }
+            forwardZapTo.value.updatePercentage(pos, 0.9f)
+
+            wantsForwardZapTo = true
+        }
+    }
+
+    fun editFromDraft(draft: Note) {
+        val noteEvent = draft.event
+        val noteAuthor = draft.author
+
+        if (noteEvent is DraftEvent && noteAuthor != null) {
+            viewModelScope.launch(Dispatchers.IO) {
+                accountViewModel.createTempDraftNote(noteEvent)?.let { innerNote ->
+                    val oldTag = (draft.event as? AddressableEvent)?.dTag()
+                    if (oldTag != null) {
+                        draftTag.set(oldTag)
+                    }
+                    loadFromDraft(innerNote)
+                }
+            }
+        }
+    }
+
+    private fun loadFromDraft(draft: Note) {
+        val draftEvent = draft.event as? PublicMessageEvent ?: return
+
+        val localForwardZapTo = draftEvent.tags.zapSplitSetup()
+        val totalWeight = localForwardZapTo.sumOf { it.weight }
+        forwardZapTo.value = SplitBuilder()
+        localForwardZapTo.forEach {
+            if (it is ZapSplitSetup) {
+                val user = LocalCache.getOrCreateUser(it.pubKeyHex)
+                forwardZapTo.value.addItem(user, (it.weight / totalWeight).toFloat())
+            }
+            // don't support editing old-style splits.
+        }
+        forwardZapToEditting.value = TextFieldValue("")
+        wantsForwardZapTo = localForwardZapTo.isNotEmpty()
+
+        wantsToMarkAsSensitive = draftEvent.isSensitive()
+
+        val geohash = draftEvent.getGeoHash()
+        wantsToAddGeoHash = geohash != null
+
+        val zapraiser = draftEvent.zapraiserAmount()
+        wantsZapraiser = zapraiser != null
+        zapRaiserAmount.value = null
+        if (zapraiser != null) {
+            zapRaiserAmount.value = zapraiser
+        }
+
+        if (forwardZapTo.value.items.isNotEmpty()) {
+            wantsForwardZapTo = true
+        }
+
+        val userSet = draftEvent.groupKeys() - account.userProfile().pubkeyHex
+
+        toUsers =
+            TextFieldValue(
+                userSet.mapNotNull { runCatching { Hex.decode(it).toNpub() }.getOrNull() }.joinToString(", ") { "@$it" },
+            )
+
+        message = TextFieldValue(draftEvent.content)
+        urlPreviews.update(message)
+
+        iMetaAttachments.addAll(draftEvent.imetas())
+    }
+
+    override fun locationFlow(): StateFlow<LocationState.LocationResult> {
+        if (location == null) {
+            location = locationManager().geohashStateFlow
+        }
+
+        return location!!
+    }
+
+    suspend fun sendPostSync() {
+        val template = createTemplate() ?: return
+        val extraNotesToBroadcast = mutableListOf<Event>()
+
+        if (nip95attachments.isNotEmpty()) {
+            val usedImages = template.tags.taggedQuoteIds().toSet()
+            nip95attachments.forEach {
+                if (usedImages.contains(it.second.id)) {
+                    extraNotesToBroadcast.add(it.first)
+                    extraNotesToBroadcast.add(it.second)
+                }
+            }
+        }
+
+        accountViewModel.account.signAndComputeBroadcast(template, extraNotesToBroadcast)
+        accountViewModel.deleteDraft(draftTag.current)
+
+        cancel()
+    }
+
+    suspend fun sendDraftSync() {
+        val accountViewModel = accountViewModel
+
+        if (message.text.isBlank()) {
+            accountViewModel.account.deleteDraft(draftTag.current)
+        } else {
+            val template = createTemplate() ?: return
+            accountViewModel.account.createAndSendDraft(draftTag.current, template)
+
+            nip95attachments.forEach {
+                account.sendToPrivateOutboxAndLocal(it.first)
+                account.sendToPrivateOutboxAndLocal(it.second)
+            }
+        }
+    }
+
+    private suspend fun createTemplate(): EventTemplate<out Event>? {
+        val toUsersTagger = NewMessageTagger(this@NewPublicMessageViewModel.toUsers.text, null, null, accountViewModel)
+        toUsersTagger.run()
+
+        val tagger = NewMessageTagger(message.text, null, null, accountViewModel)
+        tagger.run()
+
+        val users = (toUsersTagger.pTags ?: emptyList()) + (tagger.pTags ?: emptyList())
+        val toUsers = users.mapTo(mutableSetOf()) { ReceiverTag(it.pubkeyHex, it.bestRelayHint()) }
+
+        val zapReceiver = if (wantsForwardZapTo) forwardZapTo.value.toZapSplitSetup() else null
+
+        val geoHash = (location?.value as? LocationState.LocationResult.Success)?.geoHash?.toString()
+        val localZapRaiserAmount = if (wantsZapraiser) zapRaiserAmount.value else null
+
+        val emojis = findEmoji(tagger.message, account.emoji.myEmojis.value)
+        val urls = findURLs(tagger.message)
+        val usedAttachments = iMetaAttachments.filterIsIn(urls.toSet())
+
+        val contentWarningReason = if (wantsToMarkAsSensitive) "" else null
+
+        return PublicMessageEvent.build(
+            to = toUsers.toList(),
+            msg = tagger.message,
+        ) {
+            hashtags(findHashtags(tagger.message))
+            references(findURLs(tagger.message))
+            quotes(findNostrUris(tagger.message))
+
+            geoHash?.let { geohash(it) }
+            localZapRaiserAmount?.let { zapraiser(it) }
+            zapReceiver?.let { zapSplits(it) }
+            contentWarningReason?.let { contentWarning(it) }
+
+            emojis(emojis)
+            imetas(usedAttachments)
+        }
+    }
+
+    fun findEmoji(
+        message: String,
+        myEmojiSet: List<EmojiPackState.EmojiMedia>?,
+    ): List<EmojiUrlTag> {
+        if (myEmojiSet == null) return emptyList()
+        return CustomEmoji.findAllEmojiCodes(message).mapNotNull { possibleEmoji ->
+            myEmojiSet.firstOrNull { it.code == possibleEmoji }?.let { EmojiUrlTag(it.code, it.link.url) }
+        }
+    }
+
+    fun upload(
+        alt: String?,
+        contentWarningReason: String?,
+        mediaQuality: Int,
+        server: ServerName,
+        onError: (title: String, message: String) -> Unit,
+        context: Context,
+    ) = try {
+        uploadUnsafe(alt, contentWarningReason, mediaQuality, server, onError, context)
+    } catch (e: SignerExceptions.ReadOnlyException) {
+        onError(
+            stringRes(context, R.string.read_only_user),
+            stringRes(context, R.string.login_with_a_private_key_to_be_able_to_sign_events),
+        )
+    }
+
+    fun uploadUnsafe(
+        alt: String?,
+        contentWarningReason: String?,
+        mediaQuality: Int,
+        server: ServerName,
+        onError: (title: String, message: String) -> Unit,
+        context: Context,
+    ) {
+        viewModelScope.launch(Dispatchers.Default) {
+            val myMultiOrchestrator = multiOrchestrator ?: return@launch
+
+            isUploadingImage = true
+
+            val results =
+                myMultiOrchestrator.upload(
+                    alt,
+                    contentWarningReason,
+                    MediaCompressor.intToCompressorQuality(mediaQuality),
+                    server,
+                    account,
+                    context,
+                )
+
+            if (results.allGood) {
+                results.successful.forEach { state ->
+                    if (state.result is UploadOrchestrator.OrchestratorResult.NIP95Result) {
+                        val nip95 = account.createNip95(state.result.bytes, headerInfo = state.result.fileHeader, alt, contentWarningReason)
+                        nip95attachments = nip95attachments + nip95
+                        val note = nip95.let { it1 -> account?.consumeNip95(it1.first, it1.second) }
+
+                        note?.let {
+                            message = message.insertUrlAtCursor("nostr:" + it.toNEvent())
+                            urlPreviews.update(message)
+                        }
+                    } else if (state.result is UploadOrchestrator.OrchestratorResult.ServerResult) {
+                        val iMeta =
+                            IMetaTagBuilder(state.result.url)
+                                .apply {
+                                    hash(state.result.fileHeader.hash)
+                                    size(state.result.fileHeader.size)
+                                    state.result.fileHeader.mimeType
+                                        ?.let { mimeType(it) }
+                                    state.result.fileHeader.dim
+                                        ?.let { dims(it) }
+                                    state.result.fileHeader.blurHash
+                                        ?.let { blurhash(it.blurhash) }
+                                    state.result.magnet?.let { magnet(it) }
+                                    state.result.uploadedHash?.let { originalHash(it) }
+
+                                    alt?.let { alt(it) }
+                                    contentWarningReason?.let { sensitiveContent(contentWarningReason) }
+                                }.build()
+
+                        iMetaAttachments.replace(iMeta.url, iMeta)
+
+                        message = message.insertUrlAtCursor(state.result.url)
+                        urlPreviews.update(message)
+                    }
+                }
+
+                multiOrchestrator = null
+            } else {
+                val errorMessages = results.errors.map { stringRes(context, it.errorResource, *it.params) }.distinct()
+                onError(stringRes(context, R.string.failed_to_upload_media_no_details), errorMessages.joinToString(".\n"))
+            }
+
+            isUploadingImage = false
+        }
+    }
+
+    fun cancel() {
+        toUsers = TextFieldValue("")
+        message = TextFieldValue("")
+        multiOrchestrator = null
+
+        wantsInvoice = false
+        wantsZapraiser = false
+        zapRaiserAmount.value = null
+
+        wantsForwardZapTo = false
+        wantsToMarkAsSensitive = false
+        wantsToAddGeoHash = false
+        wantsSecretEmoji = false
+
+        forwardZapTo.value = SplitBuilder()
+        forwardZapToEditting.value = TextFieldValue("")
+
+        urlPreviews.reset()
+
+        userSuggestions?.reset()
+        userSuggestionsMainMessage = null
+
+        iMetaAttachments.reset()
+
+        emojiSuggestions?.reset()
+
+        draftTag.rotate()
+    }
+
+    fun deleteMediaToUpload(selected: SelectedMediaProcessing) {
+        this.multiOrchestrator?.remove(selected)
+    }
+
+    fun addToMessage(it: String) {
+        updateMessage(TextFieldValue(message.text + " " + it))
+    }
+
+    override fun updateMessage(newMessage: TextFieldValue) {
+        message = newMessage
+        urlPreviews.update(newMessage)
+
+        if (message.selection.collapsed) {
+            userSuggestionsMainMessage = UserSuggestionAnchor.MAIN_MESSAGE
+
+            val lastWord = message.currentWord()
+            userSuggestions?.processCurrentWord(lastWord)
+            emojiSuggestions?.processCurrentWord(lastWord)
+        }
+
+        draftTag.newVersion()
+    }
+
+    fun updateToUsers(newToUsersValue: TextFieldValue) {
+        toUsers = newToUsersValue
+
+        if (newToUsersValue.selection.collapsed) {
+            val lastWord = newToUsersValue.currentWord()
+            userSuggestionsMainMessage = UserSuggestionAnchor.TO_USERS
+            userSuggestions?.processCurrentWord(lastWord)
+        }
+
+        draftTag.newVersion()
+    }
+
+    override fun updateZapForwardTo(newZapForwardTo: TextFieldValue) {
+        forwardZapToEditting.value = newZapForwardTo
+        if (newZapForwardTo.selection.collapsed) {
+            val lastWord = newZapForwardTo.text
+            userSuggestionsMainMessage = UserSuggestionAnchor.FORWARD_ZAPS
+            userSuggestions?.processCurrentWord(lastWord)
+        }
+    }
+
+    fun autocompleteWithUser(item: User) {
+        userSuggestions?.let { userSuggestions ->
+            if (userSuggestionsMainMessage == UserSuggestionAnchor.MAIN_MESSAGE) {
+                val lastWord = message.currentWord()
+                message = userSuggestions.replaceCurrentWord(message, lastWord, item)
+                urlPreviews.update(message)
+            } else if (userSuggestionsMainMessage == UserSuggestionAnchor.FORWARD_ZAPS) {
+                forwardZapTo.value.addItem(item)
+                forwardZapToEditting.value = TextFieldValue("")
+            } else if (userSuggestionsMainMessage == UserSuggestionAnchor.TO_USERS) {
+                val lastWord = toUsers.currentWord()
+                toUsers = userSuggestions.replaceCurrentWord(toUsers, lastWord, item)
+            }
+
+            userSuggestionsMainMessage = null
+            userSuggestions.reset()
+        }
+
+        draftTag.newVersion()
+    }
+
+    fun autocompleteWithEmoji(item: EmojiPackState.EmojiMedia) {
+        val wordToInsert = ":${item.code}:"
+
+        message = message.replaceCurrentWord(wordToInsert)
+        urlPreviews.update(message)
+
+        emojiSuggestions?.reset()
+
+        draftTag.newVersion()
+    }
+
+    fun autocompleteWithEmojiUrl(item: EmojiPackState.EmojiMedia) {
+        val wordToInsert = item.link.url + " "
+
+        viewModelScope.launch(Dispatchers.IO) {
+            iMetaAttachments.downloadAndPrepare(item.link.url) {
+                Amethyst.instance.okHttpClients.getHttpClient(accountViewModel.account.privacyState.shouldUseTorForImageDownload(item.link.url))
+            }
+        }
+
+        message = message.replaceCurrentWord(wordToInsert)
+        urlPreviews.update(message)
+
+        emojiSuggestions?.reset()
+
+        draftTag.newVersion()
+    }
+
+    fun canPost(): Boolean =
+        message.text.isNotBlank() &&
+            !isUploadingImage &&
+            !wantsInvoice &&
+            (!wantsZapraiser || zapRaiserAmount.value != null) &&
+            (toUsers.text.isNotBlank()) &&
+            multiOrchestrator == null
+
+    fun insertAtCursor(newElement: String) {
+        message = message.insertUrlAtCursor(newElement)
+    }
+
+    fun selectImage(uris: ImmutableList<SelectedMedia>) {
+        multiOrchestrator = MultiOrchestrator(uris)
+    }
+
+    override fun onCleared() {
+        super.onCleared()
+        Log.d("Init", "OnCleared: ${this.javaClass.simpleName}")
+    }
+
+    override fun updateZapPercentage(
+        index: Int,
+        sliderValue: Float,
+    ) {
+        forwardZapTo.value.updatePercentage(index, sliderValue)
+
+        draftTag.newVersion()
+    }
+
+    override fun updateZapFromText() {
+        viewModelScope.launch(Dispatchers.Default) {
+            val tagger = NewMessageTagger(message.text, emptyList(), emptyList(), accountViewModel)
+            tagger.run()
+            tagger.pTags?.forEach { taggedUser ->
+                if (!forwardZapTo.value.items.any { it.key == taggedUser }) {
+                    forwardZapTo.value.addItem(taggedUser)
+                }
+            }
+        }
+    }
+
+    override fun updateZapRaiserAmount(newAmount: Long?) {
+        zapRaiserAmount.value = newAmount
+        draftTag.newVersion()
+    }
+
+    fun toggleMarkAsSensitive() {
+        wantsToMarkAsSensitive = !wantsToMarkAsSensitive
+        draftTag.newVersion()
+    }
+
+    override fun locationManager(): LocationState = Amethyst.instance.locationManager
+}

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/profile/conversations/dal/UserProfileConversationsFeedFilter.kt

@@ -32,6 +32,7 @@ import com.vitorpamplona.quartz.nip22Comments.CommentEvent
 import com.vitorpamplona.quartz.nip28PublicChat.message.ChannelMessageEvent
 import com.vitorpamplona.quartz.nip35Torrents.TorrentCommentEvent
 import com.vitorpamplona.quartz.nip53LiveActivities.chat.LiveActivitiesChatMessageEvent
+import com.vitorpamplona.quartz.nipA0VoiceMessages.VoiceReplyEvent
 
 class UserProfileConversationsFeedFilter(
     val user: User,
@@ -65,6 +66,7 @@ class UserProfileConversationsFeedFilter(
                     it.event is ChannelMessageEvent ||
                     it.event is LiveActivitiesChatMessageEvent ||
                     it.event is CommentEvent ||
+                    it.event is VoiceReplyEvent ||
                     it.event is TorrentCommentEvent
             ) &&
             !it.isNewThread() &&

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/profile/datasource/FilterUserProfilePosts.kt

@@ -36,6 +36,8 @@ import com.vitorpamplona.quartz.nip35Torrents.TorrentEvent
 import com.vitorpamplona.quartz.nip51Lists.PinListEvent
 import com.vitorpamplona.quartz.nip54Wiki.WikiNoteEvent
 import com.vitorpamplona.quartz.nip84Highlights.HighlightEvent
+import com.vitorpamplona.quartz.nipA0VoiceMessages.VoiceEvent
+import com.vitorpamplona.quartz.nipA0VoiceMessages.VoiceReplyEvent
 
 val UserProfilePostKinds1 =
     listOf(
@@ -47,6 +49,7 @@ val UserProfilePostKinds1 =
         PollNoteEvent.KIND,
         HighlightEvent.KIND,
         WikiNoteEvent.KIND,
+        VoiceEvent.KIND,
     )
 
 val UserProfilePostKinds2 =
@@ -55,6 +58,7 @@ val UserProfilePostKinds2 =
         TorrentCommentEvent.KIND,
         InteractiveStoryPrologueEvent.KIND,
         CommentEvent.KIND,
+        VoiceReplyEvent.KIND,
     )
 
 fun filterUserProfilePosts(

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/profile/newthreads/dal/UserProfileNewThreadFeedFilter.kt

@@ -40,6 +40,7 @@ import com.vitorpamplona.quartz.nip35Torrents.TorrentEvent
 import com.vitorpamplona.quartz.nip54Wiki.WikiNoteEvent
 import com.vitorpamplona.quartz.nip84Highlights.HighlightEvent
 import com.vitorpamplona.quartz.nip99Classifieds.ClassifiedsEvent
+import com.vitorpamplona.quartz.nipA0VoiceMessages.VoiceEvent
 
 class UserProfileNewThreadFeedFilter(
     val user: User,
@@ -79,6 +80,7 @@ class UserProfileNewThreadFeedFilter(
                     it.event is InteractiveStoryPrologueEvent ||
                     it.event is AudioTrackEvent ||
                     it.event is AudioHeaderEvent ||
+                    it.event is VoiceEvent ||
                     it.event is TorrentEvent
             ) &&
             it.isNewThread() &&

amethyst/src/main/res/values/strings.xml

@@ -159,6 +159,10 @@
     <string name="video_saved_to_the_gallery">Video saved to the phone\'s video gallery</string>
     <string name="failed_to_save_the_video">Failed to save the video</string>
     <string name="upload_image">Upload Image</string>
+    <string name="take_a_picture">Take a picture</string>
+    <string name="record_a_message">Record a message</string>
+    <string name="record_a_message_title">Record a message</string>
+    <string name="record_a_message_description">Click and hold to record a message</string>
     <string name="uploading">Uploading…</string>
     <string name="user_does_not_have_a_lightning_address_setup_to_receive_sats">User does not have a lightning address set up to receive sats</string>
     <string name="reply_here">"reply here.. "</string>

quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/AudioMeta.kt

@@ -26,6 +26,7 @@ import com.vitorpamplona.quartz.nipA0VoiceMessages.tags.WaveformTag
 
 data class AudioMeta(
     val url: String,
+    val mimeType: String? = null,
     val hash: String? = null,
     val duration: Int? = null,
     val waveform: List<Int>? = null,
@@ -33,6 +34,7 @@ data class AudioMeta(
     fun toIMetaArray(): Array<String> =
         IMetaTagBuilder(url)
             .apply {
+                mimeType?.let { mimeType(it) }
                 hash?.let { hash(it) }
                 duration?.let { duration(it) }
                 waveform?.let { waveform(it) }
@@ -42,10 +44,11 @@ data class AudioMeta(
     companion object {
         fun parse(iMeta: IMetaTag): AudioMeta =
             AudioMeta(
-                iMeta.url,
+                url = iMeta.url,
-                iMeta.hash()?.firstOrNull(),
+                mimeType = iMeta.mimeType()?.firstOrNull(),
-                iMeta.duration()?.firstOrNull()?.toIntOrNull(),
+                hash = iMeta.hash()?.firstOrNull(),
-                iMeta.waveform()?.firstOrNull()?.let { WaveformTag.parseWave(it) },
+                duration = iMeta.duration()?.firstOrNull()?.toIntOrNull(),
+                waveform = iMeta.waveform()?.firstOrNull()?.let { WaveformTag.parseWave(it) },
             )
     }
 }

quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/BaseVoiceEvent.kt

@@ -50,6 +50,7 @@ open class BaseVoiceEvent(
             initializer: TagArrayBuilder<T>.() -> Unit = {},
         ) = eventTemplate(kind, voiceMessage.url, createdAt) {
             alt(alt)
+            audioIMeta(voiceMessage)
             initializer()
         }
     }

quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/IMetaTagBuilderExt.kt

@@ -24,6 +24,7 @@ import com.vitorpamplona.quartz.nip01Core.core.HexKey
 import com.vitorpamplona.quartz.nip92IMeta.IMetaTagBuilder
 import com.vitorpamplona.quartz.nipA0VoiceMessages.tags.DurationTag
 import com.vitorpamplona.quartz.nipA0VoiceMessages.tags.HashSha256Tag
+import com.vitorpamplona.quartz.nipA0VoiceMessages.tags.MimeTypeTag
 import com.vitorpamplona.quartz.nipA0VoiceMessages.tags.WaveformTag
 
 /**
@@ -34,3 +35,5 @@ fun IMetaTagBuilder.hash(hash: HexKey) = add(HashSha256Tag.TAG_NAME, hash)
 fun IMetaTagBuilder.duration(size: Int) = add(DurationTag.TAG_NAME, size.toString())
 
 fun IMetaTagBuilder.waveform(wave: List<Int>) = add(WaveformTag.TAG_NAME, WaveformTag.assembleWave(wave))
+
+fun IMetaTagBuilder.mimeType(mime: String) = add(MimeTypeTag.TAG_NAME, mime)

quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/IMetaTagExt.kt

@@ -23,6 +23,7 @@ package com.vitorpamplona.quartz.nipA0VoiceMessages
 import com.vitorpamplona.quartz.nip92IMeta.IMetaTag
 import com.vitorpamplona.quartz.nipA0VoiceMessages.tags.DurationTag
 import com.vitorpamplona.quartz.nipA0VoiceMessages.tags.HashSha256Tag
+import com.vitorpamplona.quartz.nipA0VoiceMessages.tags.MimeTypeTag
 import com.vitorpamplona.quartz.nipA0VoiceMessages.tags.WaveformTag
 
 fun IMetaTag.hash() = properties.get(HashSha256Tag.TAG_NAME)
@@ -30,3 +31,5 @@ fun IMetaTag.hash() = properties.get(HashSha256Tag.TAG_NAME)
 fun IMetaTag.duration() = properties.get(DurationTag.TAG_NAME)
 
 fun IMetaTag.waveform() = properties.get(WaveformTag.TAG_NAME)
+
+fun IMetaTag.mimeType() = properties.get(MimeTypeTag.TAG_NAME)

quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/TagArrayBuilderExt.kt

@@ -20,15 +20,21 @@
  */
 package com.vitorpamplona.quartz.nipA0VoiceMessages
 
+import com.vitorpamplona.quartz.nip01Core.core.HexKey
 import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
+import com.vitorpamplona.quartz.nip01Core.relay.normalizer.NormalizedRelayUrl
 import com.vitorpamplona.quartz.nip94FileMetadata.tags.HashSha256Tag
+import com.vitorpamplona.quartz.nipA0VoiceMessages.tags.ReplyAuthorTag
+import com.vitorpamplona.quartz.nipA0VoiceMessages.tags.ReplyEventTag
+import com.vitorpamplona.quartz.nipA0VoiceMessages.tags.ReplyKindTag
 
 fun <T : BaseVoiceEvent> TagArrayBuilder<T>.audioIMeta(
     url: String,
+    mimeType: String? = null,
     hash: String? = null,
     duration: Int? = null,
     waveform: List<Int>? = null,
-) = audioIMeta(AudioMeta(url, hash, duration, waveform))
+) = audioIMeta(AudioMeta(url, mimeType, hash, duration, waveform))
 
 fun <T : BaseVoiceEvent> TagArrayBuilder<T>.audioIMeta(imeta: AudioMeta): TagArrayBuilder<T> {
     add(imeta.toIMetaArray())
@@ -40,3 +46,18 @@ fun <T : BaseVoiceEvent> TagArrayBuilder<T>.audioIMeta(audioUrls: List<AudioMeta
     audioUrls.forEach { audioIMeta(it) }
     return this
 }
+
+fun TagArrayBuilder<VoiceReplyEvent>.replyEvent(
+    eventId: String,
+    relayHint: NormalizedRelayUrl?,
+    pubkey: String?,
+) = addUnique(ReplyEventTag.assemble(eventId, relayHint, pubkey))
+
+fun TagArrayBuilder<VoiceReplyEvent>.replyKind(kind: String) = addUnique(ReplyKindTag.assemble(kind))
+
+fun TagArrayBuilder<VoiceReplyEvent>.replyKind(kind: Int) = addUnique(ReplyKindTag.assemble(kind))
+
+fun TagArrayBuilder<VoiceReplyEvent>.replyAuthor(
+    pubKey: HexKey,
+    relay: NormalizedRelayUrl?,
+) = add(ReplyAuthorTag.assemble(pubKey, relay))

quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/VoiceEvent.kt

@@ -38,6 +38,14 @@ class VoiceEvent(
         const val KIND = 1222
         const val ALT_DESCRIPTION = "Voice message"
 
+        fun build(
+            url: String,
+            mimeType: String?,
+            hash: String,
+            duration: Int,
+            waveform: List<Int>,
+        ) = build(AudioMeta(url, mimeType, hash, duration, waveform))
+
         fun build(
             voiceMessage: AudioMeta,
             createdAt: Long = TimeUtils.now(),

quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/VoiceReplyEvent.kt

@@ -23,7 +23,12 @@ package com.vitorpamplona.quartz.nipA0VoiceMessages
 import androidx.compose.runtime.Immutable
 import com.vitorpamplona.quartz.nip01Core.core.HexKey
 import com.vitorpamplona.quartz.nip01Core.core.TagArrayBuilder
+import com.vitorpamplona.quartz.nip01Core.hints.EventHintBundle
+import com.vitorpamplona.quartz.nipA0VoiceMessages.tags.ReplyAuthorTag
+import com.vitorpamplona.quartz.nipA0VoiceMessages.tags.ReplyEventTag
+import com.vitorpamplona.quartz.nipA0VoiceMessages.tags.ReplyKindTag
 import com.vitorpamplona.quartz.utils.TimeUtils
+import com.vitorpamplona.quartz.utils.lastNotNullOfOrNull
 
 @Immutable
 class VoiceReplyEvent(
@@ -34,14 +39,45 @@ class VoiceReplyEvent(
     content: String,
     sig: HexKey,
 ) : BaseVoiceEvent(id, pubKey, createdAt, KIND, tags, content, sig) {
+    fun replyAuthor() = tags.firstNotNullOfOrNull(ReplyAuthorTag::parse)
+
+    fun replyAuthors() = tags.filter(ReplyAuthorTag::match)
+
+    fun replyAuthorKeys() = tags.mapNotNull(ReplyAuthorTag::parseKey)
+
+    fun replyAuthorHints() = tags.mapNotNull(ReplyAuthorTag::parseAsHint)
+
+    fun directReplies() = tags.filter { ReplyEventTag.match(it) }
+
+    fun directKinds() = tags.filter(ReplyKindTag::match)
+
+    fun markedReplyTos(): List<HexKey> = tags.mapNotNull(ReplyEventTag::parseKey)
+
+    fun replyingTo(): HexKey? = tags.lastNotNullOfOrNull(ReplyEventTag::parseKey)
+
     companion object {
         const val KIND = 1244
         const val ALT_DESCRIPTION = "Voice reply"
 
+        fun build(
+            url: String,
+            mimeType: String?,
+            hash: String,
+            duration: Int,
+            waveform: List<Int>,
+            replyingTo: EventHintBundle<VoiceEvent>,
+        ) = build(AudioMeta(url, mimeType, hash, duration, waveform), replyingTo)
+
         fun build(
             voiceMessage: AudioMeta,
+            replyingTo: EventHintBundle<VoiceEvent>,
             createdAt: Long = TimeUtils.now(),
             initializer: TagArrayBuilder<VoiceReplyEvent>.() -> Unit = {},
-        ) = build(voiceMessage, KIND, ALT_DESCRIPTION, createdAt, initializer)
+        ) = build(voiceMessage, KIND, ALT_DESCRIPTION, createdAt) {
+            replyEvent(replyingTo.event.id, replyingTo.relay, replyingTo.event.pubKey)
+            replyKind(replyingTo.event.kind)
+            replyAuthor(replyingTo.event.pubKey, replyingTo.authorHomeRelay)
+            initializer()
+        }
     }
 }

quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/tags/MimeTypeTag.kt

@@ -0,0 +1,46 @@
+/**
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nipA0VoiceMessages.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class MimeTypeTag {
+    companion object {
+        const val TAG_NAME = "m"
+
+        fun isIn(
+            tag: Array<String>,
+            mimeTypes: Set<String>,
+        ) = tag.has(1) && tag[0] == TAG_NAME && tag[1] in mimeTypes
+
+        @JvmStatic
+        fun parse(tag: Array<String>): String? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            return tag[1]
+        }
+
+        @JvmStatic
+        fun assemble(mimeType: String) = arrayOf(TAG_NAME, mimeType)
+    }
+}

quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/tags/ReplyAuthorTag.kt

@@ -0,0 +1,85 @@
+/**
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nipA0VoiceMessages.tags
+
+import androidx.compose.runtime.Immutable
+import com.vitorpamplona.quartz.nip01Core.core.HexKey
+import com.vitorpamplona.quartz.nip01Core.core.Tag
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.nip01Core.hints.types.PubKeyHint
+import com.vitorpamplona.quartz.nip01Core.relay.normalizer.NormalizedRelayUrl
+import com.vitorpamplona.quartz.nip01Core.relay.normalizer.RelayUrlNormalizer
+import com.vitorpamplona.quartz.nip01Core.tags.people.PubKeyReferenceTag
+import com.vitorpamplona.quartz.utils.arrayOfNotNull
+import com.vitorpamplona.quartz.utils.ensure
+
+@Immutable
+data class ReplyAuthorTag(
+    override val pubKey: HexKey,
+    override val relayHint: NormalizedRelayUrl? = null,
+) : PubKeyReferenceTag {
+    fun toTagArray() = assemble(pubKey, relayHint)
+
+    companion object {
+        const val TAG_NAME = "p"
+
+        @JvmStatic
+        fun match(tag: Tag) = tag.has(1) && tag[0] == TAG_NAME && tag[1].isNotEmpty()
+
+        @JvmStatic
+        fun parse(tag: Tag): ReplyAuthorTag? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].length == 64) { return null }
+
+            val hint = tag.getOrNull(2)?.let { RelayUrlNormalizer.normalizeOrNull(it) }
+
+            return ReplyAuthorTag(tag[1], hint)
+        }
+
+        @JvmStatic
+        fun parseKey(tag: Tag): HexKey? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].length == 64) { return null }
+            return tag[1]
+        }
+
+        @JvmStatic
+        fun parseAsHint(tag: Array<String>): PubKeyHint? {
+            ensure(tag.has(2)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].length == 64) { return null }
+            ensure(tag[2].isNotEmpty()) { return null }
+
+            val hint = RelayUrlNormalizer.normalizeOrNull(tag[2])
+            ensure(hint != null) { return null }
+
+            return PubKeyHint(tag[1], hint)
+        }
+
+        @JvmStatic
+        fun assemble(
+            pubkey: HexKey,
+            relayHint: NormalizedRelayUrl?,
+        ) = arrayOfNotNull(TAG_NAME, pubkey, relayHint?.url)
+    }
+}

quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/tags/ReplyEventTag.kt

@@ -0,0 +1,109 @@
+/**
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nipA0VoiceMessages.tags
+
+import androidx.compose.runtime.Immutable
+import com.vitorpamplona.quartz.nip01Core.core.HexKey
+import com.vitorpamplona.quartz.nip01Core.core.Tag
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.nip01Core.hints.types.EventIdHint
+import com.vitorpamplona.quartz.nip01Core.relay.normalizer.NormalizedRelayUrl
+import com.vitorpamplona.quartz.nip01Core.relay.normalizer.RelayUrlNormalizer
+import com.vitorpamplona.quartz.nip01Core.tags.events.EventReference
+import com.vitorpamplona.quartz.utils.Hex
+import com.vitorpamplona.quartz.utils.arrayOfNotNull
+import com.vitorpamplona.quartz.utils.ensure
+
+@Immutable
+class ReplyEventTag(
+    val ref: EventReference,
+) {
+    constructor(eventId: String, relayHint: NormalizedRelayUrl?, pubkey: String?) : this(EventReference(eventId, pubkey, relayHint))
+
+    fun toTagArray() = assemble(ref)
+
+    companion object {
+        const val TAG_NAME = "e"
+
+        @JvmStatic
+        fun match(tag: Tag) = tag.has(1) && tag[0] == TAG_NAME && tag[1].isNotEmpty()
+
+        @JvmStatic
+        fun isTagged(
+            tag: Array<String>,
+            eventId: String,
+        ) = tag.has(1) && tag[0] == TAG_NAME && tag[1] == eventId
+
+        @JvmStatic
+        fun isIn(
+            tag: Array<String>,
+            eventIds: Set<String>,
+        ) = tag.has(1) && tag[0] == TAG_NAME && tag[1] in eventIds
+
+        @JvmStatic
+        fun parse(tag: Array<String>): ReplyEventTag? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].length == 64) { return null }
+            return ReplyEventTag(tag[1], tag.getOrNull(2)?.let { RelayUrlNormalizer.normalizeOrNull(it) }, tag.getOrNull(3))
+        }
+
+        @JvmStatic
+        fun parseKey(tag: Array<String>): String? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].length == 64) { return null }
+            return tag[1]
+        }
+
+        @JvmStatic
+        fun parseValidKey(tag: Array<String>): String? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].length == 64) { return null }
+            ensure(Hex.isHex(tag[1])) { return null }
+            return tag[1]
+        }
+
+        @JvmStatic
+        fun parseAsHint(tag: Array<String>): EventIdHint? {
+            ensure(tag.has(2)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].length == 64) { return null }
+            ensure(tag[2].isNotEmpty()) { return null }
+
+            val relayHint = RelayUrlNormalizer.normalizeOrNull(tag[2])
+            ensure(relayHint != null) { return null }
+
+            return EventIdHint(tag[1], relayHint)
+        }
+
+        @JvmStatic
+        fun assemble(
+            eventId: HexKey,
+            relay: NormalizedRelayUrl?,
+            pubkey: String?,
+        ) = arrayOfNotNull(TAG_NAME, eventId, relay?.url, pubkey)
+
+        @JvmStatic
+        fun assemble(ref: EventReference) = assemble(ref.eventId, ref.relayHint, ref.author)
+    }
+}

quartz/src/main/java/com/vitorpamplona/quartz/nipA0VoiceMessages/tags/ReplyKindTag.kt

@@ -0,0 +1,76 @@
+/**
+ * Copyright (c) 2025 Vitor Pamplona
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
+ * Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+package com.vitorpamplona.quartz.nipA0VoiceMessages.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.Tag
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.nip73ExternalIds.ExternalId
+import com.vitorpamplona.quartz.utils.ensure
+
+class ReplyKindTag {
+    companion object {
+        const val TAG_NAME = "k"
+
+        @JvmStatic
+        fun match(tag: Tag) = tag.has(1) && tag[0] == TAG_NAME && tag[1].isNotEmpty()
+
+        @JvmStatic
+        fun isKind(
+            tag: Tag,
+            kind: String,
+        ) = tag.has(1) && tag[0] == TAG_NAME && tag[1] == kind
+
+        @JvmStatic
+        fun isTagged(
+            tag: Tag,
+            kind: String,
+        ) = tag.has(1) && tag[0] == TAG_NAME && tag[1] == kind
+
+        @JvmStatic
+        fun isIn(
+            tag: Tag,
+            kinds: Set<String>,
+        ) = tag.has(1) && tag[0] == TAG_NAME && tag[1] in kinds
+
+        @JvmStatic
+        fun parse(tag: Tag): String? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            return tag[1]
+        }
+
+        @JvmStatic
+        fun assemble(kind: String) = arrayOf(TAG_NAME, kind)
+
+        @JvmStatic
+        fun assemble(kind: Int) = arrayOf(TAG_NAME, kind.toString())
+
+        @JvmStatic
+        fun assemble(id: ExternalId) = assemble(id.toKind())
+
+        @JvmStatic
+        fun assemble(kinds: List<String>): List<Tag> = kinds.map { assemble(it) }
+
+        @JvmStatic
+        fun assemble(kinds: Set<String>): List<Tag> = kinds.map { assemble(it) }
+    }
+}