Base Streaming view

app/src/main/java/com/vitorpamplona/amethyst/LocalPreferences.kt

@@ -55,6 +55,7 @@ private object PrefKeys {
     const val DEFAULT_HOME_FOLLOW_LIST = "defaultHomeFollowList"
     const val DEFAULT_STORIES_FOLLOW_LIST = "defaultStoriesFollowList"
     const val DEFAULT_NOTIFICATION_FOLLOW_LIST = "defaultNotificationFollowList"
+    const val DEFAULT_DISCOVERY_FOLLOW_LIST = "defaultDiscoveryFollowList"
     const val ZAP_PAYMENT_REQUEST_SERVER = "zapPaymentServer"
     const val LATEST_CONTACT_LIST = "latestContactList"
     const val HIDE_DELETE_REQUEST_DIALOG = "hide_delete_request_dialog"
@@ -216,6 +217,7 @@ object LocalPreferences {
             putString(PrefKeys.DEFAULT_HOME_FOLLOW_LIST, account.defaultHomeFollowList)
             putString(PrefKeys.DEFAULT_STORIES_FOLLOW_LIST, account.defaultStoriesFollowList)
             putString(PrefKeys.DEFAULT_NOTIFICATION_FOLLOW_LIST, account.defaultNotificationFollowList)
+            putString(PrefKeys.DEFAULT_DISCOVERY_FOLLOW_LIST, account.defaultDiscoveryFollowList)
             putString(PrefKeys.ZAP_PAYMENT_REQUEST_SERVER, gson.toJson(account.zapPaymentRequest))
             putString(PrefKeys.LATEST_CONTACT_LIST, Event.gson.toJson(account.backupContactList))
             putBoolean(PrefKeys.HIDE_DELETE_REQUEST_DIALOG, account.hideDeleteRequestDialog)
@@ -256,6 +258,7 @@ object LocalPreferences {
             val defaultHomeFollowList = getString(PrefKeys.DEFAULT_HOME_FOLLOW_LIST, null) ?: KIND3_FOLLOWS
             val defaultStoriesFollowList = getString(PrefKeys.DEFAULT_STORIES_FOLLOW_LIST, null) ?: GLOBAL_FOLLOWS
             val defaultNotificationFollowList = getString(PrefKeys.DEFAULT_NOTIFICATION_FOLLOW_LIST, null) ?: GLOBAL_FOLLOWS
+            val defaultDiscoveryFollowList = getString(PrefKeys.DEFAULT_DISCOVERY_FOLLOW_LIST, null) ?: GLOBAL_FOLLOWS
 
             val zapAmountChoices = gson.fromJson(
                 getString(PrefKeys.ZAP_AMOUNTS, "[]"),
@@ -349,6 +352,7 @@ object LocalPreferences {
                 defaultHomeFollowList = defaultHomeFollowList,
                 defaultStoriesFollowList = defaultStoriesFollowList,
                 defaultNotificationFollowList = defaultNotificationFollowList,
+                defaultDiscoveryFollowList = defaultDiscoveryFollowList,
                 zapPaymentRequest = zapPaymentRequestServer,
                 hideDeleteRequestDialog = hideDeleteRequestDialog,
                 hideBlockAlertDialog = hideBlockAlertDialog,

app/src/main/java/com/vitorpamplona/amethyst/ServiceManager.kt

@@ -14,6 +14,7 @@ import com.vitorpamplona.amethyst.service.HttpClient
 import com.vitorpamplona.amethyst.service.NostrAccountDataSource
 import com.vitorpamplona.amethyst.service.NostrChannelDataSource
 import com.vitorpamplona.amethyst.service.NostrChatroomListDataSource
+import com.vitorpamplona.amethyst.service.NostrDiscoveryDataSource
 import com.vitorpamplona.amethyst.service.NostrHomeDataSource
 import com.vitorpamplona.amethyst.service.NostrSingleChannelDataSource
 import com.vitorpamplona.amethyst.service.NostrSingleEventDataSource
@@ -66,6 +67,7 @@ object ServiceManager {
             NostrHomeDataSource.account = myAccount
             NostrChatroomListDataSource.account = myAccount
             NostrVideoDataSource.account = myAccount
+            NostrDiscoveryDataSource.account = myAccount
             ImageUploader.account = myAccount
 
             // Notification Elements
@@ -87,6 +89,7 @@ object ServiceManager {
         NostrHomeDataSource.stop()
         NostrChannelDataSource.stop()
         NostrChatroomListDataSource.stop()
+        NostrDiscoveryDataSource.stop()
 
         NostrSingleChannelDataSource.stop()
         NostrSingleEventDataSource.stop()

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

@@ -62,6 +62,7 @@ class Account(
     var defaultHomeFollowList: String = KIND3_FOLLOWS,
     var defaultStoriesFollowList: String = GLOBAL_FOLLOWS,
     var defaultNotificationFollowList: String = GLOBAL_FOLLOWS,
+    var defaultDiscoveryFollowList: String = GLOBAL_FOLLOWS,
     var zapPaymentRequest: Nip47URI? = null,
     var hideDeleteRequestDialog: Boolean = false,
     var hideBlockAlertDialog: Boolean = false,
@@ -899,6 +900,12 @@ class Account(
         saveable.invalidateData()
     }
 
+    fun changeDefaultDiscoveryFollowList(name: String) {
+        defaultDiscoveryFollowList = name
+        live.invalidateData()
+        saveable.invalidateData()
+    }
+
     fun changeZapAmounts(newAmounts: List<Long>) {
         zapAmountChoices = newAmounts
         live.invalidateData()

app/src/main/java/com/vitorpamplona/amethyst/model/Note.kt

@@ -279,6 +279,20 @@ open class Note(val idHex: String) {
         }
     }
 
+    fun publicZapAuthors(): Set<HexKey> {
+        // Zaps who the requester was the user
+        return zaps.mapNotNull {
+            it.key.author?.pubkeyHex
+        }.toSet()
+    }
+
+    fun reactionAuthors(): Set<HexKey> {
+        // Zaps who the requester was the user
+        return reactions.values.map {
+            it.mapNotNull { it.author?.pubkeyHex }
+        }.flatten().toSet()
+    }
+
     fun isReactedBy(user: User): String? {
         return reactions.filter {
             it.value.any { it.author?.pubkeyHex == user.pubkeyHex }

app/src/main/java/com/vitorpamplona/amethyst/service/NostrDiscoveryDataSource.kt

@@ -0,0 +1,57 @@
+package com.vitorpamplona.amethyst.service
+
+import com.vitorpamplona.amethyst.model.Account
+import com.vitorpamplona.amethyst.service.model.ChannelCreateEvent
+import com.vitorpamplona.amethyst.service.model.ChannelMessageEvent
+import com.vitorpamplona.amethyst.service.model.ChannelMetadataEvent
+import com.vitorpamplona.amethyst.service.model.LiveActivitiesChatMessageEvent
+import com.vitorpamplona.amethyst.service.model.LiveActivitiesEvent
+import com.vitorpamplona.amethyst.service.relays.FeedType
+import com.vitorpamplona.amethyst.service.relays.JsonFilter
+import com.vitorpamplona.amethyst.service.relays.TypedFilter
+
+object NostrDiscoveryDataSource : NostrDataSource("DiscoveryFeed") {
+    lateinit var account: Account
+
+    fun createContextualFilter(): TypedFilter {
+        val follows = account.selectedUsersFollowList(account.defaultDiscoveryFollowList)
+
+        val followKeys = follows?.map {
+            it.substring(0, 6)
+        }
+
+        return TypedFilter(
+            types = setOf(FeedType.GLOBAL),
+            filter = JsonFilter(
+                authors = followKeys,
+                kinds = listOf(ChannelCreateEvent.kind, ChannelMetadataEvent.kind, ChannelMessageEvent.kind, LiveActivitiesChatMessageEvent.kind, LiveActivitiesEvent.kind),
+                limit = 1000
+            )
+        )
+    }
+
+    fun createFollowTagsFilter(): TypedFilter? {
+        val hashToLoad = account.selectedTagsFollowList(account.defaultDiscoveryFollowList)
+
+        if (hashToLoad.isNullOrEmpty()) return null
+
+        return TypedFilter(
+            types = setOf(FeedType.GLOBAL),
+            filter = JsonFilter(
+                kinds = listOf(ChannelCreateEvent.kind, ChannelMetadataEvent.kind, ChannelMessageEvent.kind, LiveActivitiesChatMessageEvent.kind, LiveActivitiesEvent.kind),
+                tags = mapOf(
+                    "t" to hashToLoad.map {
+                        listOf(it, it.lowercase(), it.uppercase(), it.capitalize())
+                    }.flatten()
+                ),
+                limit = 1000
+            )
+        )
+    }
+
+    val discoveryFeedChannel = requestNewChannel()
+
+    override fun updateChannelFilters() {
+        discoveryFeedChannel.typedFilters = listOfNotNull(createContextualFilter(), createFollowTagsFilter()).ifEmpty { null }
+    }
+}

app/src/main/java/com/vitorpamplona/amethyst/service/model/LiveActivitiesEvent.kt

@@ -25,15 +25,27 @@ class LiveActivitiesEvent(
     fun streaming() = tags.firstOrNull { it.size > 1 && it[0] == "streaming" }?.get(1)
     fun starts() = tags.firstOrNull { it.size > 1 && it[0] == "starts" }?.get(1)
     fun ends() = tags.firstOrNull { it.size > 1 && it[0] == "ends" }?.get(1)
-    fun status() = tags.firstOrNull { it.size > 1 && it[0] == "status" }?.get(1)
+    fun status() = checkStatus(tags.firstOrNull { it.size > 1 && it[0] == "status" }?.get(1))
     fun currentParticipants() = tags.firstOrNull { it.size > 1 && it[0] == "current_participants" }?.get(1)
     fun totalParticipants() = tags.firstOrNull { it.size > 1 && it[0] == "total_participants" }?.get(1)
 
     fun participants() = tags.filter { it.size > 1 && it[0] == "p" }.map { Participant(it[1], it.getOrNull(2)) }
 
+    fun checkStatus(eventStatus: String?): String? {
+        return if (eventStatus == STATUS_LIVE && createdAt < Date().time / 1000 - (60 * 60 * 8)) { // 2 hours {
+            STATUS_ENDED
+        } else {
+            eventStatus
+        }
+    }
+
     companion object {
         const val kind = 30311
 
+        const val STATUS_LIVE = "live"
+        const val STATUS_PLANNED = "planned"
+        const val STATUS_ENDED = "ended"
+
         fun create(
             privateKey: ByteArray,
             createdAt: Long = Date().time / 1000

app/src/main/java/com/vitorpamplona/amethyst/ui/dal/DiscoverFeedFilter.kt

@@ -0,0 +1,66 @@
+package com.vitorpamplona.amethyst.ui.dal
+
+import com.vitorpamplona.amethyst.model.Account
+import com.vitorpamplona.amethyst.model.GLOBAL_FOLLOWS
+import com.vitorpamplona.amethyst.model.LocalCache
+import com.vitorpamplona.amethyst.model.Note
+import com.vitorpamplona.amethyst.service.model.*
+import com.vitorpamplona.amethyst.service.model.LiveActivitiesEvent.Companion.STATUS_ENDED
+import com.vitorpamplona.amethyst.service.model.LiveActivitiesEvent.Companion.STATUS_LIVE
+import com.vitorpamplona.amethyst.service.model.LiveActivitiesEvent.Companion.STATUS_PLANNED
+
+class DiscoverFeedFilter(val account: Account) : AdditiveFeedFilter<Note>() {
+    override fun feedKey(): String {
+        return account.userProfile().pubkeyHex + "-" + account.defaultDiscoveryFollowList
+    }
+
+    override fun feed(): List<Note> {
+        val allChannelNotes = LocalCache.channels.values.mapNotNull { LocalCache.getNoteIfExists(it.idHex) }
+        val allMessageNotes = LocalCache.channels.values.map { it.notes.values }.flatten()
+
+        val notes = innerApplyFilter(allChannelNotes + allMessageNotes)
+
+        return sort(notes)
+    }
+
+    override fun applyFilter(collection: Set<Note>): Set<Note> {
+        return innerApplyFilter(collection)
+    }
+
+    private fun innerApplyFilter(collection: Collection<Note>): Set<Note> {
+        val now = System.currentTimeMillis() / 1000
+        val isGlobal = account.defaultDiscoveryFollowList == GLOBAL_FOLLOWS
+
+        val followingKeySet = account.selectedUsersFollowList(account.defaultDiscoveryFollowList) ?: emptySet()
+        val followingTagSet = account.selectedTagsFollowList(account.defaultDiscoveryFollowList) ?: emptySet()
+
+        val activities = collection
+            .asSequence()
+            .filter { it.event is LiveActivitiesEvent }
+            .filter { isGlobal || it.author?.pubkeyHex in followingKeySet }
+            .filter { account.isAcceptable(it) }
+            .filter { (it.createdAt() ?: 0) <= now }
+            .toSet()
+
+        return activities
+    }
+
+    override fun sort(collection: Set<Note>): List<Note> {
+        return collection.sortedWith(
+            compareBy(
+                { convertStatusToOrder((it.event as? LiveActivitiesEvent)?.status()) },
+                { it.createdAt() },
+                { it.idHex }
+            )
+        ).reversed()
+    }
+
+    fun convertStatusToOrder(status: String?): Int {
+        return when (status) {
+            STATUS_LIVE -> 2
+            STATUS_PLANNED -> 1
+            STATUS_ENDED -> 0
+            else -> 0
+        }
+    }
+}

app/src/main/java/com/vitorpamplona/amethyst/ui/dal/HomeLiveActivitiesFeedFilter.kt

@@ -7,6 +7,7 @@ import com.vitorpamplona.amethyst.model.Note
 import com.vitorpamplona.amethyst.service.OnlineChecker
 import com.vitorpamplona.amethyst.service.checkNotInMainThread
 import com.vitorpamplona.amethyst.service.model.LiveActivitiesEvent
+import com.vitorpamplona.amethyst.service.model.LiveActivitiesEvent.Companion.STATUS_LIVE
 import java.util.Date
 
 class HomeLiveActivitiesFeedFilter(val account: Account) : AdditiveFeedFilter<Note>() {
@@ -41,7 +42,7 @@ class HomeLiveActivitiesFeedFilter(val account: Account) : AdditiveFeedFilter<No
             .asSequence()
             .filter { it ->
                 val noteEvent = it.event
-                (noteEvent is LiveActivitiesEvent && noteEvent.createdAt > twoHrs && noteEvent.status() == "live" && OnlineChecker.isOnline(noteEvent.streaming())) &&
+                (noteEvent is LiveActivitiesEvent && noteEvent.createdAt > twoHrs && noteEvent.status() == STATUS_LIVE && OnlineChecker.isOnline(noteEvent.streaming())) &&
                     (isGlobal || it.author?.pubkeyHex in followingKeySet || noteEvent.isTaggedHashes(followingTagSet)) &&
                     // && account.isAcceptable(it)  // This filter follows only. No need to check if acceptable
                     it.author?.let { !account.isHidden(it.pubkeyHex) } ?: true

app/src/main/java/com/vitorpamplona/amethyst/ui/navigation/AppBottomBar.kt

@@ -48,6 +48,7 @@ val bottomNavigationItems = listOf(
     Route.Home,
     Route.Message,
     Route.Video,
+    Route.Discover,
     Route.Notification
 )
 

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

@@ -12,6 +12,7 @@ import androidx.navigation.compose.composable
 import com.vitorpamplona.amethyst.ui.note.UserReactionsViewModel
 import com.vitorpamplona.amethyst.ui.screen.NostrChatroomListKnownFeedViewModel
 import com.vitorpamplona.amethyst.ui.screen.NostrChatroomListNewFeedViewModel
+import com.vitorpamplona.amethyst.ui.screen.NostrDiscoverFeedViewModel
 import com.vitorpamplona.amethyst.ui.screen.NostrHomeFeedLiveActivitiesViewModel
 import com.vitorpamplona.amethyst.ui.screen.NostrHomeFeedViewModel
 import com.vitorpamplona.amethyst.ui.screen.NostrHomeRepliesFeedViewModel
@@ -22,6 +23,7 @@ import com.vitorpamplona.amethyst.ui.screen.loggedIn.BookmarkListScreen
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.ChannelScreen
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.ChatroomListScreen
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.ChatroomScreen
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.DiscoverScreen
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.HashtagScreen
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.HiddenUsersScreen
 import com.vitorpamplona.amethyst.ui.screen.loggedIn.HomeScreen
@@ -42,6 +44,7 @@ fun AppNavigation(
     knownFeedViewModel: NostrChatroomListKnownFeedViewModel,
     newFeedViewModel: NostrChatroomListNewFeedViewModel,
     videoFeedViewModel: NostrVideoFeedViewModel,
+    discoveryFeedViewModel: NostrDiscoverFeedViewModel,
     notifFeedViewModel: NotificationViewModel,
     userReactionsStatsModel: UserReactionsViewModel,
 
@@ -106,6 +109,16 @@ fun AppNavigation(
             })
         }
 
+        Route.Discover.let { route ->
+            composable(route.route, route.arguments, content = {
+                DiscoverScreen(
+                    discoveryFeedViewModel = discoveryFeedViewModel,
+                    accountViewModel = accountViewModel,
+                    nav = nav
+                )
+            })
+        }
+
         Route.Search.let { route ->
             composable(route.route, route.arguments, content = {
                 SearchScreen(

app/src/main/java/com/vitorpamplona/amethyst/ui/navigation/AppTopBar.kt

@@ -118,6 +118,7 @@ private fun RenderTopRouteBar(
         // Route.Profile.route -> TopBarWithBackButton(nav)
         Route.Home.base -> HomeTopBar(followLists, scaffoldState, accountViewModel, nav)
         Route.Video.base -> StoriesTopBar(followLists, scaffoldState, accountViewModel, nav)
+        Route.Discover.base -> DiscoveryTopBar(followLists, scaffoldState, accountViewModel, nav)
         Route.Notification.base -> NotificationTopBar(followLists, scaffoldState, accountViewModel, nav)
         else -> MainTopBar(scaffoldState, accountViewModel, nav)
     }
@@ -178,6 +179,23 @@ fun NotificationTopBar(followLists: FollowListViewModel, scaffoldState: Scaffold
     }
 }
 
+@Composable
+fun DiscoveryTopBar(followLists: FollowListViewModel, scaffoldState: ScaffoldState, accountViewModel: AccountViewModel, nav: (String) -> Unit) {
+    GenericTopBar(scaffoldState, accountViewModel, nav) { accountViewModel ->
+        val list by accountViewModel.accountLiveData.map {
+            it.account.defaultDiscoveryFollowList
+        }.observeAsState(GLOBAL_FOLLOWS)
+
+        FollowList(
+            followLists,
+            list,
+            true
+        ) { listName ->
+            accountViewModel.account.changeDefaultDiscoveryFollowList(listName)
+        }
+    }
+}
+
 @Composable
 fun MainTopBar(scaffoldState: ScaffoldState, accountViewModel: AccountViewModel, nav: (String) -> Unit) {
     GenericTopBar(scaffoldState, accountViewModel, nav) {

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

@@ -57,6 +57,11 @@ sealed class Route(
         icon = R.drawable.ic_video
     )
 
+    object Discover : Route(
+        route = "Discover",
+        icon = R.drawable.ic_sensors
+    )
+
     object Notification : Route(
         route = "Notification",
         icon = R.drawable.ic_notifications,

app/src/main/java/com/vitorpamplona/amethyst/ui/note/ChannelCardCompose.kt

@@ -0,0 +1,480 @@
+package com.vitorpamplona.amethyst.ui.note
+
+import androidx.compose.animation.Crossfade
+import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.combinedClickable
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.ExperimentalLayoutApi
+import androidx.compose.foundation.layout.FlowRow
+import androidx.compose.foundation.layout.aspectRatio
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material.MaterialTheme
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.MutableState
+import androidx.compose.runtime.derivedStateOf
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.livedata.observeAsState
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment.Companion.BottomStart
+import androidx.compose.ui.Alignment.Companion.TopEnd
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.compositeOver
+import androidx.compose.ui.layout.ContentScale
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.distinctUntilChanged
+import androidx.lifecycle.map
+import coil.compose.AsyncImage
+import com.vitorpamplona.amethyst.model.LocalCache
+import com.vitorpamplona.amethyst.model.Note
+import com.vitorpamplona.amethyst.model.User
+import com.vitorpamplona.amethyst.service.OnlineChecker
+import com.vitorpamplona.amethyst.service.model.LiveActivitiesEvent
+import com.vitorpamplona.amethyst.service.model.LiveActivitiesEvent.Companion.STATUS_ENDED
+import com.vitorpamplona.amethyst.service.model.LiveActivitiesEvent.Companion.STATUS_LIVE
+import com.vitorpamplona.amethyst.service.model.LiveActivitiesEvent.Companion.STATUS_PLANNED
+import com.vitorpamplona.amethyst.ui.screen.equalImmutableLists
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.AccountViewModel
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.ChannelHeader
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.EndedFlag
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.LiveFlag
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.OfflineFlag
+import com.vitorpamplona.amethyst.ui.screen.loggedIn.ScheduledFlag
+import com.vitorpamplona.amethyst.ui.theme.QuoteBorder
+import com.vitorpamplona.amethyst.ui.theme.Size35dp
+import com.vitorpamplona.amethyst.ui.theme.newItemBackgroundColor
+import kotlinx.collections.immutable.ImmutableList
+import kotlinx.collections.immutable.persistentListOf
+import kotlinx.collections.immutable.persistentSetOf
+import kotlinx.collections.immutable.toImmutableList
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+
+@OptIn(ExperimentalFoundationApi::class)
+@Composable
+fun ChannelCardCompose(
+    baseNote: Note,
+    routeForLastRead: String? = null,
+    modifier: Modifier = Modifier,
+    parentBackgroundColor: MutableState<Color>? = null,
+    accountViewModel: AccountViewModel,
+    nav: (String) -> Unit
+) {
+    val isBlank by baseNote.live().metadata.map {
+        it.note.event == null
+    }.distinctUntilChanged().observeAsState(baseNote.event == null)
+
+    Crossfade(targetState = isBlank) {
+        if (it) {
+            LongPressToQuickAction(baseNote = baseNote, accountViewModel = accountViewModel) { showPopup ->
+                BlankNote(
+                    remember {
+                        modifier.combinedClickable(
+                            onClick = { },
+                            onLongClick = showPopup
+                        )
+                    },
+                    false
+                )
+            }
+        } else {
+            CheckHiddenChannelCardCompose(
+                baseNote,
+                routeForLastRead,
+                modifier,
+                parentBackgroundColor,
+                accountViewModel,
+                nav
+            )
+        }
+    }
+}
+
+@Composable
+fun CheckHiddenChannelCardCompose(
+    note: Note,
+    routeForLastRead: String? = null,
+    modifier: Modifier = Modifier,
+    parentBackgroundColor: MutableState<Color>? = null,
+    accountViewModel: AccountViewModel,
+    nav: (String) -> Unit
+) {
+    val isHidden by accountViewModel.accountLiveData.map {
+        accountViewModel.isNoteHidden(note)
+    }.distinctUntilChanged().observeAsState(accountViewModel.isNoteHidden(note))
+
+    Crossfade(targetState = isHidden) {
+        if (!it) {
+            LoadedChannelCardCompose(
+                note,
+                routeForLastRead,
+                modifier,
+                parentBackgroundColor,
+                accountViewModel,
+                nav
+            )
+        }
+    }
+}
+
+@Composable
+fun LoadedChannelCardCompose(
+    note: Note,
+    routeForLastRead: String? = null,
+    modifier: Modifier = Modifier,
+    parentBackgroundColor: MutableState<Color>? = null,
+    accountViewModel: AccountViewModel,
+    nav: (String) -> Unit
+) {
+    var state by remember {
+        mutableStateOf(
+            NoteComposeReportState(
+                isAcceptable = true,
+                canPreview = true,
+                relevantReports = persistentSetOf()
+            )
+        )
+    }
+
+    val scope = rememberCoroutineScope()
+
+    WatchForReports(note, accountViewModel) { newIsAcceptable, newCanPreview, newRelevantReports ->
+        if (newIsAcceptable != state.isAcceptable || newCanPreview != state.canPreview) {
+            val newState = NoteComposeReportState(newIsAcceptable, newCanPreview, newRelevantReports)
+            scope.launch(Dispatchers.Main) {
+                state = newState
+            }
+        }
+    }
+
+    Crossfade(targetState = state) {
+        RenderChannelCardReportState(
+            it,
+            note,
+            routeForLastRead,
+            modifier,
+            parentBackgroundColor,
+            accountViewModel,
+            nav
+        )
+    }
+}
+
+@Composable
+fun RenderChannelCardReportState(
+    state: NoteComposeReportState,
+    note: Note,
+    routeForLastRead: String? = null,
+    modifier: Modifier = Modifier,
+    parentBackgroundColor: MutableState<Color>? = null,
+    accountViewModel: AccountViewModel,
+    nav: (String) -> Unit
+) {
+    var showReportedNote by remember { mutableStateOf(false) }
+
+    Crossfade(targetState = !state.isAcceptable && !showReportedNote) { showHiddenNote ->
+        if (showHiddenNote) {
+            HiddenNote(
+                state.relevantReports,
+                accountViewModel,
+                modifier,
+                false,
+                nav,
+                onClick = { showReportedNote = true }
+            )
+        } else {
+            NormalChannelCard(
+                note,
+                routeForLastRead,
+                modifier,
+                parentBackgroundColor,
+                accountViewModel,
+                nav
+            )
+        }
+    }
+}
+
+@Composable
+fun NormalChannelCard(
+    baseNote: Note,
+    routeForLastRead: String? = null,
+    modifier: Modifier = Modifier,
+    parentBackgroundColor: MutableState<Color>? = null,
+    accountViewModel: AccountViewModel,
+    nav: (String) -> Unit
+) {
+    LongPressToQuickAction(baseNote = baseNote, accountViewModel = accountViewModel) { showPopup ->
+        CheckNewAndRenderChannelCard(
+            baseNote,
+            routeForLastRead,
+            modifier,
+            parentBackgroundColor,
+            accountViewModel,
+            showPopup,
+            nav
+        )
+    }
+}
+
+@Composable
+private fun CheckNewAndRenderChannelCard(
+    baseNote: Note,
+    routeForLastRead: String? = null,
+    modifier: Modifier = Modifier,
+    parentBackgroundColor: MutableState<Color>? = null,
+    accountViewModel: AccountViewModel,
+    showPopup: () -> Unit,
+    nav: (String) -> Unit
+) {
+    val newItemColor = MaterialTheme.colors.newItemBackgroundColor
+    val defaultBackgroundColor = MaterialTheme.colors.background
+    val backgroundColor = remember { mutableStateOf<Color>(defaultBackgroundColor) }
+
+    LaunchedEffect(key1 = routeForLastRead, key2 = parentBackgroundColor?.value) {
+        launch(Dispatchers.IO) {
+            routeForLastRead?.let {
+                val lastTime = accountViewModel.account.loadLastRead(it)
+
+                val createdAt = baseNote.createdAt()
+                if (createdAt != null) {
+                    accountViewModel.account.markAsRead(it, createdAt)
+
+                    val isNew = createdAt > lastTime
+
+                    val newBackgroundColor = if (isNew) {
+                        if (parentBackgroundColor != null) {
+                            newItemColor.compositeOver(parentBackgroundColor.value)
+                        } else {
+                            newItemColor.compositeOver(defaultBackgroundColor)
+                        }
+                    } else {
+                        parentBackgroundColor?.value ?: defaultBackgroundColor
+                    }
+
+                    if (newBackgroundColor != backgroundColor.value) {
+                        launch(Dispatchers.Main) {
+                            backgroundColor.value = newBackgroundColor
+                        }
+                    }
+                }
+            } ?: run {
+                val newBackgroundColor = parentBackgroundColor?.value ?: defaultBackgroundColor
+
+                if (newBackgroundColor != backgroundColor.value) {
+                    launch(Dispatchers.Main) {
+                        backgroundColor.value = newBackgroundColor
+                    }
+                }
+            }
+        }
+    }
+
+    ClickableNote(
+        baseNote = baseNote,
+        backgroundColor = backgroundColor,
+        modifier = modifier,
+        accountViewModel = accountViewModel,
+        showPopup = showPopup,
+        nav = nav
+    ) {
+        InnerChannelCardWithReactions(
+            baseNote = baseNote,
+            accountViewModel = accountViewModel,
+            nav = nav
+        )
+    }
+}
+
+@Composable
+fun InnerChannelCardWithReactions(
+    baseNote: Note,
+    accountViewModel: AccountViewModel,
+    nav: (String) -> Unit
+) {
+    Column() {
+        RenderNoteRow(
+            baseNote,
+            accountViewModel,
+            nav
+        )
+    }
+}
+
+@Composable
+private fun RenderNoteRow(
+    baseNote: Note,
+    accountViewModel: AccountViewModel,
+    nav: (String) -> Unit
+) {
+    when (remember { baseNote.event }) {
+        is LiveActivitiesEvent -> {
+            RenderLiveActivityThumb(baseNote, accountViewModel, nav)
+        }
+    }
+}
+
+@OptIn(ExperimentalLayoutApi::class)
+@Composable
+fun RenderLiveActivityThumb(baseNote: Note, accountViewModel: AccountViewModel, nav: (String) -> Unit) {
+    val noteEvent = baseNote.event as? LiveActivitiesEvent ?: return
+
+    val eventUpdates by baseNote.live().metadata.observeAsState()
+
+    val media = remember(eventUpdates) { noteEvent.streaming() }
+    val cover by remember(eventUpdates) {
+        derivedStateOf {
+            noteEvent.image()?.ifBlank { null }
+        }
+    }
+    val subject = remember(eventUpdates) { noteEvent.title()?.ifBlank { null } }
+    val content = remember(eventUpdates) { noteEvent.summary() }
+    val participants = remember(eventUpdates) { noteEvent.participants() }
+    val status = remember(eventUpdates) { noteEvent.status() }
+
+    var isOnline by remember { mutableStateOf(false) }
+
+    LaunchedEffect(key1 = media) {
+        launch(Dispatchers.IO) {
+            val newIsOnline = OnlineChecker.isOnline(media)
+            if (isOnline != newIsOnline) {
+                isOnline = newIsOnline
+            }
+        }
+    }
+
+    var participantUsers by remember {
+        mutableStateOf<ImmutableList<User>>(
+            persistentListOf()
+        )
+    }
+
+    LaunchedEffect(key1 = eventUpdates) {
+        launch(Dispatchers.IO) {
+            val channel = LocalCache.getChannelIfExists(baseNote.idHex)
+            val repliesByFollows = channel?.notes?.mapNotNull { it.value.author?.pubkeyHex }?.toSet() ?: emptySet()
+
+            val zappers = baseNote.publicZapAuthors()
+            val likeAuthors = baseNote.reactionAuthors()
+
+            val allParticipants = (repliesByFollows + zappers + likeAuthors).filter { accountViewModel.isFollowing(it) }
+
+            val newParticipantUsers = (
+                participants.mapNotNull { part ->
+                    if (part.key != baseNote.author?.pubkeyHex) {
+                        LocalCache.checkGetOrCreateUser(part.key)
+                    } else {
+                        null
+                    }
+                } + allParticipants.mapNotNull {
+                    if (it != baseNote.author?.pubkeyHex) {
+                        LocalCache.checkGetOrCreateUser(it)
+                    } else {
+                        null
+                    }
+                }
+                ).toImmutableList()
+
+            if (!equalImmutableLists(newParticipantUsers, participantUsers)) {
+                participantUsers = newParticipantUsers
+            }
+        }
+    }
+
+    Column(
+        modifier = Modifier.fillMaxWidth()
+    ) {
+        Box(
+            contentAlignment = TopEnd,
+            modifier = Modifier
+                .aspectRatio(ratio = 16f / 9f)
+                .fillMaxWidth()
+        ) {
+            cover?.let {
+                AsyncImage(
+                    model = it,
+                    contentDescription = null,
+                    contentScale = ContentScale.Crop,
+                    modifier = Modifier
+                        .fillMaxSize()
+                        .clip(QuoteBorder)
+                )
+            } ?: run {
+                baseNote.author?.let {
+                    DisplayAuthorBanner(it)
+                }
+            }
+
+            Box(Modifier.padding(10.dp)) {
+                Crossfade(targetState = status) {
+                    when (it) {
+                        STATUS_LIVE -> {
+                            if (media.isNullOrBlank()) {
+                                LiveFlag()
+                            } else if (isOnline) {
+                                LiveFlag()
+                            } else {
+                                OfflineFlag()
+                            }
+                        }
+                        STATUS_ENDED -> {
+                            EndedFlag()
+                        }
+                        STATUS_PLANNED -> {
+                            ScheduledFlag()
+                        }
+                        else -> {
+                            EndedFlag()
+                        }
+                    }
+                }
+            }
+
+            Box(Modifier.padding(10.dp).align(BottomStart)) {
+                if (participantUsers.isNotEmpty()) {
+                    FlowRow() {
+                        participantUsers.forEach {
+                            ClickableUserPicture(it, Size35dp, accountViewModel)
+                        }
+                    }
+                }
+            }
+        }
+
+        ChannelHeader(
+            channelHex = remember { baseNote.idHex },
+            showVideo = false,
+            showBottomDiviser = false,
+            showFlag = false,
+            modifier = remember {
+                Modifier.padding(start = 0.dp, end = 0.dp, top = 5.dp, bottom = 5.dp)
+            },
+            accountViewModel = accountViewModel,
+            nav = nav
+        )
+    }
+}
+
+@Composable
+fun DisplayAuthorBanner(author: User) {
+    val picture by author.live().metadata.map {
+        it.user.info?.banner?.ifBlank { null } ?: it.user.info?.picture?.ifBlank { null }
+    }.observeAsState()
+
+    AsyncImage(
+        model = picture,
+        contentDescription = null,
+        contentScale = ContentScale.Crop,
+        modifier = Modifier
+            .fillMaxSize()
+            .clip(QuoteBorder)
+    )
+}

app/src/main/java/com/vitorpamplona/amethyst/ui/note/NoteCompose.kt

@@ -108,6 +108,8 @@ import com.vitorpamplona.amethyst.service.model.GenericRepostEvent
 import com.vitorpamplona.amethyst.service.model.HighlightEvent
 import com.vitorpamplona.amethyst.service.model.LiveActivitiesChatMessageEvent
 import com.vitorpamplona.amethyst.service.model.LiveActivitiesEvent
+import com.vitorpamplona.amethyst.service.model.LiveActivitiesEvent.Companion.STATUS_LIVE
+import com.vitorpamplona.amethyst.service.model.LiveActivitiesEvent.Companion.STATUS_PLANNED
 import com.vitorpamplona.amethyst.service.model.LongTextNoteEvent
 import com.vitorpamplona.amethyst.service.model.Participant
 import com.vitorpamplona.amethyst.service.model.PeopleListEvent
@@ -538,7 +540,7 @@ private fun CheckNewAndRenderNote(
 
 @Composable
 @OptIn(ExperimentalFoundationApi::class)
-private fun ClickableNote(
+fun ClickableNote(
     baseNote: Note,
     modifier: Modifier,
     backgroundColor: MutableState<Color>,
@@ -549,7 +551,7 @@ private fun ClickableNote(
 ) {
     val scope = rememberCoroutineScope()
 
-    val updatedModifier = remember(backgroundColor.value) {
+    val updatedModifier = remember(baseNote, backgroundColor.value) {
         modifier
             .combinedClickable(
                 onClick = {
@@ -1785,7 +1787,7 @@ private fun ReplyNoteComposition(
 }
 
 @Composable
-private fun SecondUserInfoRow(
+fun SecondUserInfoRow(
     note: Note,
     accountViewModel: AccountViewModel,
     nav: (String) -> Unit
@@ -1809,7 +1811,7 @@ private fun SecondUserInfoRow(
 }
 
 @Composable
-private fun FirstUserInfoRow(
+fun FirstUserInfoRow(
     baseNote: Note,
     showAuthorPicture: Boolean,
     accountViewModel: AccountViewModel,
@@ -1854,7 +1856,7 @@ private fun BoostedMark() {
 }
 
 @Composable
-private fun MoreOptionsButton(
+fun MoreOptionsButton(
     baseNote: Note,
     accountViewModel: AccountViewModel
 ) {
@@ -2690,12 +2692,12 @@ fun RenderLiveActivityEventInner(baseNote: Note, accountViewModel: AccountViewMo
 
         Crossfade(targetState = status) {
             when (it) {
-                "live" -> {
+                STATUS_LIVE -> {
                     if (isOnline) {
                         LiveFlag()
                     }
                 }
-                "planned" -> {
+                STATUS_PLANNED -> {
                     ScheduledFlag()
                 }
             }
@@ -2744,7 +2746,7 @@ fun RenderLiveActivityEventInner(baseNote: Note, accountViewModel: AccountViewMo
     }
 
     media?.let { media ->
-        if (status == "live") {
+        if (status == STATUS_LIVE) {
             if (isOnline) {
                 Row(
                     verticalAlignment = Alignment.CenterVertically,
@@ -2841,7 +2843,7 @@ private fun LongFormHeader(noteEvent: LongTextNoteEvent, note: Note, accountView
 }
 
 @Composable
-private fun CreateImageHeader(
+fun CreateImageHeader(
     note: Note,
     accountViewModel: AccountViewModel
 ) {

app/src/main/java/com/vitorpamplona/amethyst/ui/note/UsernameDisplay.kt

@@ -16,6 +16,7 @@ import androidx.compose.runtime.derivedStateOf
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.livedata.observeAsState
 import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalLifecycleOwner
@@ -33,20 +34,20 @@ import com.vitorpamplona.amethyst.ui.theme.StdHorzSpacer
 import com.vitorpamplona.amethyst.ui.theme.placeholderText
 
 @Composable
-fun NoteUsernameDisplay(baseNote: Note, weight: Modifier = Modifier) {
+fun NoteUsernameDisplay(baseNote: Note, weight: Modifier = Modifier, showPlayButton: Boolean = true) {
     val authorState by baseNote.live().metadata.map {
         it.note.author
     }.observeAsState(baseNote.author)
 
     Crossfade(targetState = authorState, modifier = weight) {
         it?.let {
-            UsernameDisplay(it, weight)
+            UsernameDisplay(it, weight, showPlayButton)
         }
     }
 }
 
 @Composable
-fun UsernameDisplay(baseUser: User, weight: Modifier = Modifier) {
+fun UsernameDisplay(baseUser: User, weight: Modifier = Modifier, showPlayButton: Boolean = true) {
     val npubDisplay by remember {
         derivedStateOf {
             baseUser.pubkeyDisplayHex()
@@ -59,7 +60,7 @@ fun UsernameDisplay(baseUser: User, weight: Modifier = Modifier) {
 
     Crossfade(targetState = userMetadata, modifier = weight) {
         if (it != null) {
-            UserNameDisplay(it.bestUsername(), it.bestDisplayName(), npubDisplay, it.tags, weight)
+            UserNameDisplay(it.bestUsername(), it.bestDisplayName(), npubDisplay, it.tags, weight, showPlayButton)
         } else {
             NPubDisplay(npubDisplay, weight)
         }
@@ -72,14 +73,15 @@ private fun UserNameDisplay(
     bestDisplayName: String?,
     npubDisplay: String,
     tags: ImmutableListOfLists<String>?,
-    modifier: Modifier
+    modifier: Modifier,
+    showPlayButton: Boolean = true
 ) {
     if (bestUserName != null && bestDisplayName != null && bestDisplayName != bestUserName) {
-        UserAndUsernameDisplay(bestDisplayName, tags, bestUserName, modifier)
+        UserAndUsernameDisplay(bestDisplayName, tags, bestUserName, modifier, showPlayButton)
     } else if (bestDisplayName != null) {
-        UserDisplay(bestDisplayName, tags, modifier)
+        UserDisplay(bestDisplayName, tags, modifier, showPlayButton)
     } else if (bestUserName != null) {
-        UserDisplay(bestUserName, tags, modifier)
+        UserDisplay(bestUserName, tags, modifier, showPlayButton)
     } else {
         NPubDisplay(npubDisplay, modifier)
     }
@@ -100,9 +102,10 @@ private fun NPubDisplay(npubDisplay: String, modifier: Modifier) {
 private fun UserDisplay(
     bestDisplayName: String,
     tags: ImmutableListOfLists<String>?,
-    modifier: Modifier
+    modifier: Modifier,
+    showPlayButton: Boolean = true
 ) {
-    Row(modifier = modifier) {
+    Row(modifier = modifier, verticalAlignment = Alignment.CenterVertically) {
         CreateTextWithEmoji(
             text = bestDisplayName,
             tags = tags,
@@ -111,8 +114,10 @@ private fun UserDisplay(
             overflow = TextOverflow.Ellipsis,
             modifier = modifier
         )
-        Spacer(StdHorzSpacer)
-        DrawPlayName(bestDisplayName)
+        if (showPlayButton) {
+            Spacer(StdHorzSpacer)
+            DrawPlayName(bestDisplayName)
+        }
     }
 }
 
@@ -121,9 +126,10 @@ private fun UserAndUsernameDisplay(
     bestDisplayName: String,
     tags: ImmutableListOfLists<String>?,
     bestUserName: String,
-    modifier: Modifier
+    modifier: Modifier,
+    showPlayButton: Boolean = true
 ) {
-    Row(modifier = modifier) {
+    Row(modifier = modifier, verticalAlignment = Alignment.CenterVertically) {
         CreateTextWithEmoji(
             text = bestDisplayName,
             tags = tags,
@@ -138,8 +144,10 @@ private fun UserAndUsernameDisplay(
             overflow = TextOverflow.Ellipsis,
             modifier = modifier
         )
-        Spacer(StdHorzSpacer)
-        DrawPlayName(bestDisplayName)
+        if (showPlayButton) {
+            Spacer(StdHorzSpacer)
+            DrawPlayName(bestDisplayName)
+        }
     }
 }
 

app/src/main/java/com/vitorpamplona/amethyst/ui/screen/FeedViewModel.kt

@@ -21,6 +21,7 @@ import com.vitorpamplona.amethyst.ui.dal.ChannelFeedFilter
 import com.vitorpamplona.amethyst.ui.dal.ChatroomFeedFilter
 import com.vitorpamplona.amethyst.ui.dal.ChatroomListKnownFeedFilter
 import com.vitorpamplona.amethyst.ui.dal.ChatroomListNewFeedFilter
+import com.vitorpamplona.amethyst.ui.dal.DiscoverFeedFilter
 import com.vitorpamplona.amethyst.ui.dal.FeedFilter
 import com.vitorpamplona.amethyst.ui.dal.HashtagFeedFilter
 import com.vitorpamplona.amethyst.ui.dal.HomeConversationsFeedFilter
@@ -65,6 +66,15 @@ class NostrVideoFeedViewModel(val account: Account) : FeedViewModel(VideoFeedFil
         }
     }
 }
+
+class NostrDiscoverFeedViewModel(val account: Account) : FeedViewModel(DiscoverFeedFilter(account)) {
+    class Factory(val account: Account) : ViewModelProvider.Factory {
+        override fun <NostrDiscoverFeedViewModel : ViewModel> create(modelClass: Class<NostrDiscoverFeedViewModel>): NostrDiscoverFeedViewModel {
+            return NostrDiscoverFeedViewModel(account) as NostrDiscoverFeedViewModel
+        }
+    }
+}
+
 class NostrThreadFeedViewModel(val noteId: String) : FeedViewModel(ThreadFeedFilter(noteId)) {
     class Factory(val noteId: String) : ViewModelProvider.Factory {
         override fun <NostrThreadFeedViewModel : ViewModel> create(modelClass: Class<NostrThreadFeedViewModel>): NostrThreadFeedViewModel {

app/src/main/java/com/vitorpamplona/amethyst/ui/screen/RememberForeverStates.kt

@@ -17,6 +17,7 @@ object ScrollStateKeys {
     const val GLOBAL_SCREEN = "Global"
     const val NOTIFICATION_SCREEN = "Notifications"
     const val VIDEO_SCREEN = "Video"
+    const val DISCOVER_SCREEN = "Discover"
     val HOME_FOLLOWS = Route.Home.base + "Follows"
     val HOME_REPLIES = Route.Home.base + "FollowsReplies"
 }

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

@@ -13,6 +13,7 @@ import androidx.lifecycle.viewModelScope
 import com.vitorpamplona.amethyst.R
 import com.vitorpamplona.amethyst.model.Account
 import com.vitorpamplona.amethyst.model.AccountState
+import com.vitorpamplona.amethyst.model.HexKey
 import com.vitorpamplona.amethyst.model.Note
 import com.vitorpamplona.amethyst.model.User
 import com.vitorpamplona.amethyst.model.UserState
@@ -241,6 +242,10 @@ class AccountViewModel(val account: Account) : ViewModel() {
         return account.userProfile().isFollowingCached(user)
     }
 
+    fun isFollowing(user: HexKey): Boolean {
+        return account.userProfile().isFollowingCached(user)
+    }
+
     val hideDeleteRequestDialog: Boolean
         get() = account.hideDeleteRequestDialog
 

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

@@ -83,6 +83,7 @@ import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.amethyst.model.Note
 import com.vitorpamplona.amethyst.model.PublicChatChannel
 import com.vitorpamplona.amethyst.service.NostrChannelDataSource
+import com.vitorpamplona.amethyst.service.model.LiveActivitiesEvent.Companion.STATUS_LIVE
 import com.vitorpamplona.amethyst.ui.actions.NewChannelView
 import com.vitorpamplona.amethyst.ui.actions.NewMessageTagger
 import com.vitorpamplona.amethyst.ui.actions.NewPostViewModel
@@ -516,6 +517,7 @@ fun ChannelHeader(
     channelHex: String,
     showVideo: Boolean,
     showBottomDiviser: Boolean,
+    showFlag: Boolean = true,
     modifier: Modifier = StdPadding,
     accountViewModel: AccountViewModel,
     nav: (String) -> Unit
@@ -535,6 +537,7 @@ fun ChannelHeader(
             it,
             showVideo,
             showBottomDiviser,
+            showFlag,
             modifier,
             accountViewModel,
             nav
@@ -547,6 +550,7 @@ fun ChannelHeader(
     baseChannel: Channel,
     showVideo: Boolean,
     showBottomDiviser: Boolean,
+    showFlag: Boolean = true,
     modifier: Modifier = StdPadding,
     accountViewModel: AccountViewModel,
     nav: (String) -> Unit
@@ -564,27 +568,33 @@ fun ChannelHeader(
         val channelState by baseChannel.live.observeAsState()
         val channel = remember(channelState) { channelState?.channel } ?: return
 
-        val streamingUrl by remember(channelState) {
-            derivedStateOf {
-                val activity = channel as? LiveActivitiesChannel
-                val description = activity?.info?.title()
-                val url = activity?.info?.streaming()
-                if (url != null) {
-                    ZoomableUrlVideo(url, description = description)
-                } else {
-                    null
+        if (showVideo) {
+            val streamingUrl by remember(channelState) {
+                derivedStateOf {
+                    val activity = channel as? LiveActivitiesChannel
+                    val description = activity?.info?.title()
+                    val url = activity?.info?.streaming()
+                    if (url != null) {
+                        ZoomableUrlVideo(url, description = description)
+                    } else {
+                        null
+                    }
+                }
+            }
+
+            streamingUrl?.let {
+                CheckIfUrlIsOnline(it.url) {
+                    Row(
+                        verticalAlignment = Alignment.CenterVertically,
+                        modifier = remember { Modifier.heightIn(max = 300.dp) }
+                    ) {
+                        ZoomableContentView(
+                            content = it
+                        )
+                    }
                 }
             }
         }
-
-        if (streamingUrl != null && showVideo) {
-            Row(verticalAlignment = Alignment.CenterVertically, modifier = remember { Modifier.heightIn(max = 300.dp) }) {
-                ZoomableContentView(
-                    content = streamingUrl!!
-                )
-            }
-        }
-
         Column(modifier = modifier) {
             Row(verticalAlignment = Alignment.CenterVertically) {
                 if (channel is LiveActivitiesChannel) {
@@ -653,7 +663,7 @@ fun ChannelHeader(
                         ChannelActionOptions(channel, accountViewModel, nav)
                     }
                     if (channel is LiveActivitiesChannel) {
-                        LiveChannelActionOptions(channel, accountViewModel, nav)
+                        LiveChannelActionOptions(channel, showFlag, accountViewModel, nav)
                     }
                 }
             }
@@ -702,12 +712,13 @@ private fun ChannelActionOptions(
 @Composable
 private fun LiveChannelActionOptions(
     channel: LiveActivitiesChannel,
+    showFlag: Boolean = true,
     accountViewModel: AccountViewModel,
     nav: (String) -> Unit
 ) {
     val isLive by remember(channel) {
         derivedStateOf {
-            channel.info?.status() == "live"
+            channel.info?.status() == STATUS_LIVE
         }
     }
 
@@ -716,7 +727,7 @@ private fun LiveChannelActionOptions(
     }
 
     note?.let {
-        if (isLive) {
+        if (showFlag && isLive) {
             LiveFlag()
             Spacer(modifier = StdHorzSpacer)
         }

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

@@ -0,0 +1,160 @@
+package com.vitorpamplona.amethyst.ui.screen.loggedIn
+
+import androidx.compose.animation.Crossfade
+import androidx.compose.animation.core.tween
+import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.PaddingValues
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.lazy.LazyListState
+import androidx.compose.foundation.lazy.itemsIndexed
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.DisposableEffect
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.livedata.observeAsState
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalLifecycleOwner
+import androidx.compose.ui.unit.dp
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.LifecycleEventObserver
+import androidx.lifecycle.viewmodel.compose.viewModel
+import com.vitorpamplona.amethyst.service.NostrDiscoveryDataSource
+import com.vitorpamplona.amethyst.ui.note.ChannelCardCompose
+import com.vitorpamplona.amethyst.ui.screen.FeedEmpty
+import com.vitorpamplona.amethyst.ui.screen.FeedError
+import com.vitorpamplona.amethyst.ui.screen.FeedState
+import com.vitorpamplona.amethyst.ui.screen.FeedViewModel
+import com.vitorpamplona.amethyst.ui.screen.LoadingFeed
+import com.vitorpamplona.amethyst.ui.screen.NostrDiscoverFeedViewModel
+import com.vitorpamplona.amethyst.ui.screen.RefresheableView
+import com.vitorpamplona.amethyst.ui.screen.SaveableFeedState
+import com.vitorpamplona.amethyst.ui.screen.ScrollStateKeys
+
+@Composable
+fun DiscoverScreen(
+    discoveryFeedViewModel: NostrDiscoverFeedViewModel,
+    accountViewModel: AccountViewModel,
+    nav: (String) -> Unit
+) {
+    val lifeCycleOwner = LocalLifecycleOwner.current
+
+    WatchAccountForDiscoveryScreen(discoveryViewModel = discoveryFeedViewModel, accountViewModel = accountViewModel)
+
+    DisposableEffect(accountViewModel) {
+        val observer = LifecycleEventObserver { _, event ->
+            if (event == Lifecycle.Event.ON_RESUME) {
+                println("Discovery Start")
+                NostrDiscoveryDataSource.start()
+            }
+            if (event == Lifecycle.Event.ON_PAUSE) {
+                println("Discovery Stop")
+                NostrDiscoveryDataSource.stop()
+            }
+        }
+
+        lifeCycleOwner.lifecycle.addObserver(observer)
+        onDispose {
+            lifeCycleOwner.lifecycle.removeObserver(observer)
+        }
+    }
+
+    Column(Modifier.fillMaxHeight()) {
+        Column(
+            modifier = Modifier.padding(vertical = 0.dp)
+        ) {
+            RefresheableView(discoveryFeedViewModel, true) {
+                SaveableFeedState(discoveryFeedViewModel, scrollStateKey = ScrollStateKeys.DISCOVER_SCREEN) { listState ->
+                    RenderDiscoverFeed(discoveryFeedViewModel, accountViewModel, listState, nav)
+                }
+            }
+        }
+    }
+}
+
+@Composable
+private fun RenderDiscoverFeed(
+    viewModel: FeedViewModel,
+    accountViewModel: AccountViewModel,
+    listState: LazyListState,
+    nav: (String) -> Unit
+) {
+    val feedState by viewModel.feedContent.collectAsState()
+
+    Crossfade(
+        targetState = feedState,
+        animationSpec = tween(durationMillis = 100)
+    ) { state ->
+        when (state) {
+            is FeedState.Empty -> {
+                FeedEmpty {
+                    viewModel.invalidateData()
+                }
+            }
+
+            is FeedState.FeedError -> {
+                FeedError(state.errorMessage) {
+                    viewModel.invalidateData()
+                }
+            }
+
+            is FeedState.Loaded -> {
+                DiscoverFeedLoaded(
+                    state,
+                    listState,
+                    accountViewModel,
+                    nav
+                )
+            }
+
+            is FeedState.Loading -> {
+                LoadingFeed()
+            }
+        }
+    }
+}
+
+@Composable
+fun WatchAccountForDiscoveryScreen(discoveryViewModel: NostrDiscoverFeedViewModel, accountViewModel: AccountViewModel) {
+    val accountState by accountViewModel.accountLiveData.observeAsState()
+
+    LaunchedEffect(accountViewModel, accountState?.account?.defaultDiscoveryFollowList) {
+        NostrDiscoveryDataSource.resetFilters()
+        discoveryViewModel.checkKeysInvalidateDataAndSendToTop()
+    }
+}
+
+@OptIn(ExperimentalFoundationApi::class)
+@Composable
+private fun DiscoverFeedLoaded(
+    state: FeedState.Loaded,
+    listState: LazyListState,
+    accountViewModel: AccountViewModel,
+    nav: (String) -> Unit
+) {
+    LazyColumn(
+        contentPadding = PaddingValues(
+            top = 10.dp,
+            bottom = 10.dp
+        ),
+        state = listState
+    ) {
+        itemsIndexed(state.feed.value, key = { _, item -> item.idHex }) { _, item ->
+            val defaultModifier = remember {
+                Modifier.padding(10.dp).animateItemPlacement()
+            }
+
+            ChannelCardCompose(
+                item,
+                modifier = defaultModifier,
+                accountViewModel = accountViewModel,
+                nav = nav
+            )
+        }
+    }
+}

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

@@ -33,6 +33,7 @@ import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
 import androidx.lifecycle.Lifecycle
 import androidx.lifecycle.LifecycleEventObserver
+import androidx.lifecycle.map
 import com.vitorpamplona.amethyst.R
 import com.vitorpamplona.amethyst.model.Note
 import com.vitorpamplona.amethyst.service.NostrHomeDataSource
@@ -211,12 +212,22 @@ private fun FeedLoaded(
 
 @Composable
 fun CheckIfLiveActivityIsOnline(note: Note, whenOnline: @Composable () -> Unit) {
-    val noteState by note.live().metadata.observeAsState()
+    val url by note.live().metadata.map {
+        (note.event as? LiveActivitiesEvent)?.streaming()
+    }.observeAsState()
+
+    url?.let {
+        CheckIfUrlIsOnline(it, whenOnline)
+    }
+}
+
+@Composable
+fun CheckIfUrlIsOnline(url: String, whenOnline: @Composable () -> Unit) {
     var online by remember { mutableStateOf(false) }
 
-    LaunchedEffect(key1 = noteState) {
+    LaunchedEffect(key1 = url) {
         launch(Dispatchers.IO) {
-            online = OnlineChecker.isOnline((note.event as? LiveActivitiesEvent)?.streaming())
+            online = OnlineChecker.isOnline(url)
         }
     }
 

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

@@ -43,6 +43,7 @@ import com.vitorpamplona.amethyst.ui.screen.AccountState
 import com.vitorpamplona.amethyst.ui.screen.AccountStateViewModel
 import com.vitorpamplona.amethyst.ui.screen.NostrChatroomListKnownFeedViewModel
 import com.vitorpamplona.amethyst.ui.screen.NostrChatroomListNewFeedViewModel
+import com.vitorpamplona.amethyst.ui.screen.NostrDiscoverFeedViewModel
 import com.vitorpamplona.amethyst.ui.screen.NostrHomeFeedLiveActivitiesViewModel
 import com.vitorpamplona.amethyst.ui.screen.NostrHomeFeedViewModel
 import com.vitorpamplona.amethyst.ui.screen.NostrHomeRepliesFeedViewModel
@@ -98,6 +99,11 @@ fun MainScreen(accountViewModel: AccountViewModel, accountStateViewModel: Accoun
         factory = NostrVideoFeedViewModel.Factory(accountViewModel.account)
     )
 
+    val discoveryFeedViewModel: NostrDiscoverFeedViewModel = viewModel(
+        key = accountViewModel.userProfile().pubkeyHex + "NostrDiscoveryFeedViewModel",
+        factory = NostrDiscoverFeedViewModel.Factory(accountViewModel.account)
+    )
+
     val notifFeedViewModel: NotificationViewModel = viewModel(
         key = accountViewModel.userProfile().pubkeyHex + "NotificationViewModel",
         factory = NotificationViewModel.Factory(accountViewModel.account)
@@ -136,6 +142,9 @@ fun MainScreen(accountViewModel: AccountViewModel, accountStateViewModel: Accoun
                     Route.Video.base -> {
                         videoFeedViewModel.sendToTop()
                     }
+                    Route.Discover.base -> {
+                        discoveryFeedViewModel.sendToTop()
+                    }
                     Route.Notification.base -> {
                         notifFeedViewModel.invalidateDataAndSendToTop()
                     }
@@ -184,6 +193,7 @@ fun MainScreen(accountViewModel: AccountViewModel, accountStateViewModel: Accoun
                     knownFeedViewModel,
                     newFeedViewModel,
                     videoFeedViewModel,
+                    discoveryFeedViewModel,
                     notifFeedViewModel,
                     userReactionsStatsModel,
                     navController,

app/src/main/java/com/vitorpamplona/amethyst/ui/theme/Shape.kt

@@ -51,6 +51,7 @@ val Size17dp = 17.dp
 val Size18dp = 18.dp
 val Size19dp = 19.dp
 val Size20dp = 20.dp
+val Size22dp = 22.dp
 val Size24dp = 24.dp
 val Size25dp = 25.dp
 val Size30dp = 30.dp

app/src/main/res/drawable/ic_sensors.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="48dp"
+    android:height="48dp"
+    android:viewportWidth="960"
+    android:viewportHeight="960">
+  <path
+      android:fillColor="#9c9c9c"
+      android:pathData="M142.11,817.89Q77.63,753.42 40.02,666.86 2.41,580.29 2.41,480q0,-100.29 37.61,-186.86 37.61,-86.56 102.08,-151.04l51.34,51.34q-54.92,54.92 -87.16,128.35 -32.24,73.43 -32.24,158.2 0,84.77 31.64,157.6 31.64,72.83 87.76,128.95zM277.03,682.97q-38.21,-38.21 -60.89,-90.14 -22.69,-51.94 -22.69,-112.83 0,-60.89 22.69,-112.83 22.69,-51.94 60.89,-90.14l51.34,51.34q-28.66,28.66 -45.97,67.46 -17.31,38.8 -17.31,84.17 0,45.37 16.72,83.58 16.72,38.21 46.56,68.06zM480,575.52q-39.4,0 -67.46,-28.06 -28.06,-28.06 -28.06,-67.46 0,-39.4 28.06,-67.46 28.06,-28.06 67.46,-28.06 39.4,0 67.46,28.06 28.06,28.06 28.06,67.46 0,39.4 -28.06,67.46 -28.06,28.06 -67.46,28.06zM682.97,682.97 L631.63,631.63q28.66,-28.66 45.97,-67.46 17.31,-38.8 17.31,-84.17 0,-45.37 -16.72,-83.58 -16.72,-38.21 -46.56,-68.06l51.34,-51.34q38.21,38.21 60.89,90.14 22.69,51.94 22.69,112.83 0,59.7 -22.69,111.64 -22.69,51.94 -60.89,91.34zM817.89,817.89 L766.55,766.55q54.92,-54.92 87.16,-128.35 32.24,-73.43 32.24,-158.2 0,-84.77 -31.64,-157.6 -31.64,-72.83 -87.76,-128.95l51.34,-51.34q64.47,65.67 102.08,152.23 37.61,86.56 37.61,185.66 0,99.1 -37.61,185.66 -37.61,86.56 -102.08,152.23z"
+      android:strokeWidth="1.19396"/>
+</vector>