Storing and Counting followers of the main account.

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

@@ -18,7 +18,7 @@ class User(val pubkey: ByteArray) {
     val follows = Collections.synchronizedSet(mutableSetOf<User>())
     val taggedPosts = Collections.synchronizedSet(mutableSetOf<Note>())
 
-    var follower: Number? = null
+    val followers = Collections.synchronizedSet(mutableSetOf<User>())
 
     fun toBestDisplayName(): String {
         return bestDisplayName() ?: bestUsername() ?: pubkeyDisplayHex
@@ -37,9 +37,26 @@ class User(val pubkey: ByteArray) {
         return info.picture ?: "https://robohash.org/${pubkeyHex}.png"
     }
 
+    fun follow(user: User) {
+        follows.add(user)
+        user.followers.add(this)
+    }
+    fun unfollow(user: User) {
+        follows.remove(user)
+        user.followers.remove(this)
+    }
+
     fun updateFollows(newFollows: List<User>, updateAt: Long) {
-        follows.clear()
+        val toBeAdded = newFollows - follows
-        follows.addAll(newFollows)
+        val toBeRemoved = follows - newFollows
+
+        toBeAdded.forEach {
+            follow(it)
+        }
+        toBeRemoved.forEach {
+            unfollow(it)
+        }
+
         updatedFollowsAt = updateAt
 
         live.refresh()

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

@@ -2,8 +2,11 @@ package com.vitorpamplona.amethyst.service
 
 import com.vitorpamplona.amethyst.model.LocalCache
 import com.vitorpamplona.amethyst.model.Note
+import com.vitorpamplona.amethyst.service.model.ReactionEvent
+import com.vitorpamplona.amethyst.service.model.RepostEvent
 import java.util.Collections
 import nostr.postr.JsonFilter
+import nostr.postr.events.TextNoteEvent
 
 object NostrSingleEventDataSource: NostrDataSource("SingleEventFeed") {
   val eventsToWatch = Collections.synchronizedList(mutableListOf<String>())
@@ -15,7 +18,9 @@ object NostrSingleEventDataSource: NostrDataSource("SingleEventFeed") {
       return null
     }
 
+    // downloads all the reactions to a given event.
     return JsonFilter(
+      kinds = listOf(TextNoteEvent.kind, ReactionEvent.kind, RepostEvent.kind),
       tags = mapOf("e" to reactionsToWatch)
     )
   }
@@ -39,6 +44,7 @@ object NostrSingleEventDataSource: NostrDataSource("SingleEventFeed") {
       return null
     }
 
+    // downloads linked events to this event.
     return JsonFilter(
       ids = interestedEvents
     )

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

@@ -118,11 +118,11 @@ fun ProfileContent(accountUser: User?, modifier: Modifier = Modifier) {
         Text(" @${accountUser?.bestUsername()}", color = Color.LightGray)
         Row(modifier = Modifier.padding(top = 15.dp)) {
             Row() {
-                Text("${accountUser?.follows?.size}", fontWeight = FontWeight.Bold)
+                Text("${accountUser?.follows?.size ?: "--"}", fontWeight = FontWeight.Bold)
                 Text(" Following")
             }
             Row(modifier = Modifier.padding(start = 10.dp)) {
-                Text("${accountUser?.follower ?: "--"}", fontWeight = FontWeight.Bold)
+                Text("${accountUser?.followers?.size ?: "--"}", fontWeight = FontWeight.Bold)
                 Text(" Followers")
             }
         }