Shows WoT Followers

amethyst/src/main/java/com/vitorpamplona/amethyst/model/trustedAssertions/UserCardsCache.kt

@@ -32,6 +32,7 @@ import kotlinx.coroutines.flow.emitAll
 import kotlinx.coroutines.flow.flowOn
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.update
+import java.text.NumberFormat
 
 class UserCardsCache : UserDependencies {
     val receivedCards = MutableStateFlow(mapOf<User, AddressableNote>())
@@ -107,4 +108,38 @@ class UserCardsCache : UserDependencies {
         }.map {
             (it?.note?.event as? ContactCardEvent)?.rank()
         }.flowOn(Dispatchers.IO)
+
+    val formatter = NumberFormat.getInstance()
+
+    fun followerCountStrFlow(trustProviderList: TrustProviderListState) =
+        combineTransform(receivedCards, trustProviderList.liveUserFollowerCount) { cards, provider ->
+            if (provider != null) {
+                val flow =
+                    cards.firstNotNullOfOrNull {
+                        if (it.key.pubkeyHex == provider.pubkey) {
+                            it.value
+                                .flow()
+                                .metadata.stateFlow
+                        } else {
+                            null
+                        }
+                    }
+
+                if (flow != null) {
+                    emitAll(flow)
+                } else {
+                    emit(null)
+                }
+            } else {
+                emit(null)
+            }
+        }.map {
+            val value = (it?.note?.event as? ContactCardEvent)?.followerCount()
+
+            if (value != null && value > 0) {
+                formatter.format(value)
+            } else {
+                "--"
+            }
+        }.flowOn(Dispatchers.IO)
 }

amethyst/src/main/java/com/vitorpamplona/amethyst/service/relayClient/reqCommand/user/UserObservers.kt

@@ -616,6 +616,21 @@ fun observeUserContactCardsScore(
     return flow.collectAsStateWithLifecycle(null)
 }
 
+@OptIn(ExperimentalCoroutinesApi::class, FlowPreview::class)
+@Composable
+fun observeUserContactCardsFollowerCount(
+    user: User,
+    accountViewModel: AccountViewModel,
+): State<String> {
+    // Subscribe in the relay for changes in the metadata of this user.
+    UserFinderFilterAssemblerSubscription(user, accountViewModel)
+
+    // Subscribe in the LocalCache for changes that arrive in the device
+    val flow = remember(user) { user.cards().followerCountStrFlow(accountViewModel.account.trustProviderList) }
+
+    return flow.collectAsStateWithLifecycle("--")
+}
+
 @OptIn(ExperimentalCoroutinesApi::class, FlowPreview::class)
 @Composable
 fun observeUserStatuses(

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/navigation/drawer/DrawerContent.kt

@@ -20,6 +20,7 @@
  */
 package com.vitorpamplona.amethyst.ui.navigation.drawer
 
+import android.R.attr.fontWeight
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.border
 import androidx.compose.foundation.clickable
@@ -95,7 +96,7 @@ import com.vitorpamplona.amethyst.R
 import com.vitorpamplona.amethyst.model.Account
 import com.vitorpamplona.amethyst.model.User
 import com.vitorpamplona.amethyst.service.relayClient.reqCommand.event.observeNote
-import com.vitorpamplona.amethyst.service.relayClient.reqCommand.user.observeUserFollowerCount
+import com.vitorpamplona.amethyst.service.relayClient.reqCommand.user.observeUserContactCardsFollowerCount
 import com.vitorpamplona.amethyst.service.relayClient.reqCommand.user.observeUserInfo
 import com.vitorpamplona.amethyst.ui.components.CreateTextWithEmoji
 import com.vitorpamplona.amethyst.ui.components.RobohashFallbackAsyncImage
@@ -121,6 +122,7 @@ import com.vitorpamplona.amethyst.ui.theme.bannerModifier
 import com.vitorpamplona.amethyst.ui.theme.drawerSpacing
 import com.vitorpamplona.amethyst.ui.theme.placeholderText
 import com.vitorpamplona.amethyst.ui.theme.profileContentHeaderModifier
+import com.vitorpamplona.quartz.experimental.trustedAssertions.list.tags.ProviderTypes.followerCount
 import com.vitorpamplona.quartz.nip01Core.core.Address
 import com.vitorpamplona.quartz.nip01Core.core.HexKey
 import com.vitorpamplona.quartz.nip01Core.core.ImmutableListOfLists
@@ -395,29 +397,41 @@ private fun FollowingAndFollowerCounts(
     Row(
         modifier = drawerSpacing.clickable(onClick = onClick),
     ) {
-        val followingCount = baseAccountUser.kind3FollowList.flow.collectAsStateWithLifecycle()
-        val followerCount by observeUserFollowerCount(baseAccountUser.userProfile(), accountViewModel)
-
-        Text(
-            text =
-                followingCount.value.authors.size
-                    .toString(),
-            fontWeight = FontWeight.Bold,
-        )
+        DisplayFollowingCount(baseAccountUser)
 
         Text(stringRes(R.string.following))
 
         Spacer(modifier = DoubleHorzSpacer)
 
-        Text(
-            text = if (followerCount > 0) followerCount.toString() else "--",
-            fontWeight = FontWeight.Bold,
-        )
+        DisplayFollowerCount(baseAccountUser, accountViewModel)
 
         Text(stringRes(R.string.followers))
     }
 }
 
+@Composable
+fun DisplayFollowingCount(baseAccountUser: Account) {
+    val followingCount by baseAccountUser.kind3FollowList.flow.collectAsStateWithLifecycle()
+
+    Text(
+        text = followingCount.authors.size.toString(),
+        fontWeight = FontWeight.Bold,
+    )
+}
+
+@Composable
+fun DisplayFollowerCount(
+    baseAccountUser: Account,
+    accountViewModel: AccountViewModel,
+) {
+    val followerCount by observeUserContactCardsFollowerCount(baseAccountUser.userProfile(), accountViewModel)
+
+    Text(
+        text = followerCount,
+        fontWeight = FontWeight.Bold,
+    )
+}
+
 @Composable
 fun ListContent(
     modifier: Modifier,

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/experimental/relationshipStatus/ContactCardEvent.kt

@@ -21,6 +21,7 @@
 package com.vitorpamplona.quartz.experimental.relationshipStatus
 
 import androidx.compose.runtime.Immutable
+import com.vitorpamplona.quartz.experimental.relationshipStatus.tags.FollowerCountTag
 import com.vitorpamplona.quartz.experimental.relationshipStatus.tags.PetNameTag
 import com.vitorpamplona.quartz.experimental.relationshipStatus.tags.RankTag
 import com.vitorpamplona.quartz.experimental.relationshipStatus.tags.SummaryTag
@@ -49,6 +50,8 @@ class ContactCardEvent(
 
     fun rank() = tags.firstNotNullOfOrNull(RankTag::parse)
 
+    fun followerCount() = tags.firstNotNullOfOrNull(FollowerCountTag::parse)
+
     fun petName() = tags.firstNotNullOfOrNull(PetNameTag::parse)
 
     fun summary() = tags.firstNotNullOfOrNull(SummaryTag::parse)

quartz/src/commonMain/kotlin/com/vitorpamplona/quartz/experimental/relationshipStatus/tags/FollowerCountTag.kt

@@ -0,0 +1,39 @@
+/**
+ * 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.experimental.relationshipStatus.tags
+
+import com.vitorpamplona.quartz.nip01Core.core.has
+import com.vitorpamplona.quartz.utils.ensure
+
+class FollowerCountTag {
+    companion object {
+        const val TAG_NAME = "followers"
+
+        fun parse(tag: Array<String>): Int? {
+            ensure(tag.has(1)) { return null }
+            ensure(tag[0] == TAG_NAME) { return null }
+            ensure(tag[1].isNotEmpty()) { return null }
+            return tag[1].toIntOrNull()
+        }
+
+        fun assemble(followerCount: Int) = arrayOf(TAG_NAME, followerCount.toString())
+    }
+}