It works!

app/src/main/java/eu/steffo/twom/main/MainActivity.kt

@@ -19,6 +19,7 @@ import kotlinx.coroutines.launch
 import org.matrix.android.sdk.api.session.Session
 import org.matrix.android.sdk.api.session.room.model.create.CreateRoomParams
 import org.matrix.android.sdk.api.session.room.model.create.CreateRoomPreset
+import org.matrix.android.sdk.api.session.room.model.create.CreateRoomStateEvent
 
 
 class MainActivity : ComponentActivity() {
@@ -176,6 +177,52 @@ class MainActivity : ComponentActivity() {
                 createRoomParams.topic = description
                 createRoomParams.preset = CreateRoomPreset.PRESET_PRIVATE_CHAT
                 createRoomParams.roomType = TwoMMatrix.ROOM_TYPE
+                createRoomParams.initialStates = mutableListOf(
+                    CreateRoomStateEvent(
+                        type = "m.room.power_levels",
+                        content = mapOf(
+                            // Users start with a power level of 0
+                            "users_default" to 0,
+                            // Allow only the party creator to send arbitrary events
+                            "events_default" to 100,
+                            // Allow only the party creator to send arbitrary states
+                            "state_default" to 100,
+
+                            // Allow only party officers to send invites
+                            "invite" to 50,
+                            // Allow only party officers to kick invitees
+                            "kick" to 50,
+                            // Allow only party officers to ban invitees
+                            "ban" to 50,
+                            // Allow only party officers to redact other people's events
+                            "redact" to 50,
+
+                            "notifications" to mapOf(
+                                // Allow only party officers to ping the room
+                                "room" to 50,
+                            ),
+
+                            "events" to mapOf(
+                                // Allow party officers to rename the room
+                                "m.room.name" to 50,
+                                // Allow party officers to change the room avatar
+                                "m.room.avatar" to 50,
+                                // Allow party officers to change the room topic
+                                "m.room.topic" to 50,
+                                // Allow everyone to redact their own states
+                                "m.room.redaction" to 0,
+                                // Allow everyone to set RSVPs
+                                // FIXME: Do we really want everyone to set RSVPs? Maybe we should use m.room.member instead?
+                                "eu.steffo.twom.rsvp" to 0,
+                            ),
+
+                            "users" to mapOf(
+                                // Give ourselves admin permissions
+                                session!!.myUserId to 100,
+                            )
+                        )
+                    )
+                )
 
                 when (avatarUri?.toFile()?.isFile) {
                     false -> {

app/src/main/java/eu/steffo/twom/room/MemberListItem.kt

@@ -25,8 +25,8 @@ fun MemberListItem(
     modifier: Modifier = Modifier,
     memberId: String,
     onClickMember: (memberId: String) -> Unit = {},
-    rsvpAnswer: RSVPAnswer? = null,
-    rsvpComment: String = "",
+    rsvpAnswer: RSVPAnswer,
+    rsvpComment: String,
 ) {
     val session = LocalSession.current
 

app/src/main/java/eu/steffo/twom/room/RSVPAnswer.kt

@@ -1,6 +1,8 @@
 package eu.steffo.twom.room
 
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.State
+import androidx.compose.runtime.livedata.observeAsState
 import androidx.compose.ui.graphics.vector.ImageVector
 import eu.steffo.twom.R
 import eu.steffo.twom.theme.StaticColorRole
@@ -14,33 +16,37 @@ import eu.steffo.twom.theme.iconMaybe
 import eu.steffo.twom.theme.iconNoway
 import eu.steffo.twom.theme.iconSure
 import eu.steffo.twom.theme.iconUnknown
-import org.matrix.android.sdk.api.util.JsonDict
+import org.matrix.android.sdk.api.query.QueryStringValue
+import org.matrix.android.sdk.api.session.events.model.Event
+import org.matrix.android.sdk.api.session.room.Room
+import org.matrix.android.sdk.api.util.Optional
 
-enum class RSVPAnswer : JsonDict {
+enum class RSVPAnswer {
     SURE,
     LATER,
     MAYBE,
     NOWAY,
+    UNKNOWN,
 }
 
 @Composable
-fun RSVPAnswer?.toStaticColorRole(): StaticColorRole {
+fun RSVPAnswer.toStaticColorRole(): StaticColorRole {
     return when (this) {
         RSVPAnswer.SURE -> colorRoleSure()
         RSVPAnswer.LATER -> colorRoleLater()
         RSVPAnswer.MAYBE -> colorRoleMaybe()
         RSVPAnswer.NOWAY -> colorRoleNoway()
-        null -> colorRoleUnknown()
+        RSVPAnswer.UNKNOWN -> colorRoleUnknown()
     }
 }
 
-fun RSVPAnswer?.toIcon(): ImageVector {
+fun RSVPAnswer.toIcon(): ImageVector {
     return when (this) {
         RSVPAnswer.SURE -> iconSure
         RSVPAnswer.LATER -> iconLater
         RSVPAnswer.MAYBE -> iconMaybe
         RSVPAnswer.NOWAY -> iconNoway
-        null -> iconUnknown
+        RSVPAnswer.UNKNOWN -> iconUnknown
     }
 }
 
@@ -50,25 +56,72 @@ fun RSVPAnswer.toLabelResourceId(): Int {
         RSVPAnswer.LATER -> R.string.room_rsvp_later_label
         RSVPAnswer.MAYBE -> R.string.room_rsvp_maybe_label
         RSVPAnswer.NOWAY -> R.string.room_rsvp_noway_label
+        RSVPAnswer.UNKNOWN -> R.string.room_rsvp_unknown_label
     }
 }
 
-fun RSVPAnswer?.toResponseResourceId(): Int {
+fun RSVPAnswer.toResponseResourceId(): Int {
     return when (this) {
         RSVPAnswer.SURE -> R.string.room_rsvp_sure_response
         RSVPAnswer.LATER -> R.string.room_rsvp_later_response
         RSVPAnswer.MAYBE -> R.string.room_rsvp_maybe_response
         RSVPAnswer.NOWAY -> R.string.room_rsvp_noway_response
-        null -> R.string.room_rsvp_unknown_response
+        RSVPAnswer.UNKNOWN -> R.string.room_rsvp_unknown_response
     }
 }
 
-fun RSVPAnswer?.toPlaceholderResourceId(): Int {
+fun RSVPAnswer.toPlaceholderResourceId(): Int {
     return when (this) {
         RSVPAnswer.SURE -> R.string.room_rsvp_sure_placeholder
         RSVPAnswer.LATER -> R.string.room_rsvp_later_placeholder
         RSVPAnswer.MAYBE -> R.string.room_rsvp_maybe_placeholder
         RSVPAnswer.NOWAY -> R.string.room_rsvp_noway_placeholder
-        null -> R.string.room_rsvp_unknown_placeholder
+        RSVPAnswer.UNKNOWN -> R.string.room_rsvp_unknown_placeholder
     }
 }
+
+fun RSVPAnswer.toEmoji(): String {
+    return when (this) {
+        RSVPAnswer.SURE -> "✅"
+        RSVPAnswer.LATER -> "\uD83D\uDD52️"
+        RSVPAnswer.MAYBE -> "❔"
+        RSVPAnswer.NOWAY -> "⛔️"
+        RSVPAnswer.UNKNOWN -> "ℹ️"
+    }
+}
+
+fun makeRSVP(request: State<Optional<Event>?>?): Triple<Event, RSVPAnswer, String>? {
+    val event = request?.value?.getOrNull() ?: return null
+    val content = event.content ?: return null
+
+    val answerAny = content["answer"]
+    val commentAny = content["comment"]
+
+    val answer = if (answerAny is String) {
+        try {
+            RSVPAnswer.valueOf(answerAny)
+        } catch (_: IllegalArgumentException) {
+            RSVPAnswer.UNKNOWN
+        }
+    } else {
+        RSVPAnswer.UNKNOWN
+    }
+
+    val comment = if (commentAny is String) {
+        commentAny
+    } else {
+        ""
+    }
+
+    return Triple(event, answer, comment)
+}
+
+@Composable
+fun observeRsvpAsLiveState(room: Room, userId: String): Triple<Event, RSVPAnswer, String>? {
+    val request = room.stateService().getStateEventLive(
+        eventType = "eu.steffo.twom.rsvp",
+        stateKey = QueryStringValue.Equals(userId),
+    ).observeAsState()
+
+    return makeRSVP(request)
+}

app/src/main/java/eu/steffo/twom/room/RSVPAnswerSelectRow.kt

@@ -15,14 +15,14 @@ import eu.steffo.twom.theme.TwoMPadding
 @Preview
 fun RSVPAnswerSelectRow(
     modifier: Modifier = Modifier,
-    value: RSVPAnswer? = null,
-    onChange: (answer: RSVPAnswer?) -> Unit = {},
+    value: RSVPAnswer = RSVPAnswer.UNKNOWN,
+    onChange: (answer: RSVPAnswer) -> Unit = {},
 ) {
     fun toggleSwitch(representing: RSVPAnswer): () -> Unit {
         return {
             onChange(
                 when (value) {
-                    representing -> null
+                    representing -> RSVPAnswer.UNKNOWN
                     else -> representing
                 }
             )
@@ -35,7 +35,7 @@ fun RSVPAnswerSelectRow(
     ) {
         Row(
             modifier = Modifier
-                .padding(start = 10.dp, end = 10.dp)
+                .padding(start = 8.dp, end = 8.dp)
         ) {
             RSVPAnswerFilterChip(
                 modifier = TwoMPadding.chips,

app/src/main/java/eu/steffo/twom/room/RSVPCommentField.kt

@@ -1,6 +1,5 @@
 package eu.steffo.twom.room
 
-import androidx.compose.material3.LocalContentColor
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.OutlinedTextField
 import androidx.compose.material3.OutlinedTextFieldDefaults
@@ -16,9 +15,9 @@ fun RSVPCommentField(
     modifier: Modifier = Modifier,
     value: String = "",
     onChange: (value: String) -> Unit = {},
-    currentRsvpAnswer: RSVPAnswer? = null,
+    rsvpAnswer: RSVPAnswer = RSVPAnswer.UNKNOWN,
 ) {
-    val colorRole = currentRsvpAnswer.toStaticColorRole()
+    val colorRole = rsvpAnswer.toStaticColorRole()
 
     OutlinedTextField(
         modifier = modifier,
@@ -28,11 +27,10 @@ fun RSVPCommentField(
         shape = MaterialTheme.shapes.small,
         placeholder = {
             Text(
-                text = stringResource(currentRsvpAnswer.toPlaceholderResourceId())
+                text = stringResource(rsvpAnswer.toPlaceholderResourceId())
             )
         },
-        colors = if (currentRsvpAnswer != null) {
-            OutlinedTextFieldDefaults.colors(
+        colors = OutlinedTextFieldDefaults.colors(
             focusedContainerColor = colorRole.valueContainer,
             unfocusedContainerColor = colorRole.valueContainer,
             focusedTextColor = colorRole.onValueContainer,
@@ -41,11 +39,5 @@ fun RSVPCommentField(
             unfocusedBorderColor = colorRole.onValueContainer.copy(alpha = 0.3f),
             cursorColor = colorRole.onValueContainer,
         )
-        } else {
-            OutlinedTextFieldDefaults.colors(
-                focusedBorderColor = LocalContentColor.current,
-                unfocusedBorderColor = MaterialTheme.colorScheme.surfaceVariant,
-            )
-        },
     )
 }

app/src/main/java/eu/steffo/twom/room/RSVPUpdateButton.kt

@@ -16,9 +16,9 @@ fun RSVPUpdateButton(
     modifier: Modifier = Modifier,
     enabled: Boolean = true,
     onClick: () -> Unit = {},
-    currentRsvpAnswer: RSVPAnswer? = null,
+    rsvpAnswer: RSVPAnswer = RSVPAnswer.UNKNOWN,
 ) {
-    val colorRole = currentRsvpAnswer.toStaticColorRole()
+    val colorRole = rsvpAnswer.toStaticColorRole()
 
     Button(
         modifier = modifier,

app/src/main/java/eu/steffo/twom/room/RoomActivityAnswerForm.kt

@@ -14,9 +14,10 @@ import androidx.compose.ui.unit.dp
 @Composable
 @Preview
 fun RoomActivityAnswerForm(
-    currentRsvpAnswer: RSVPAnswer? = null,
+    currentRsvpAnswer: RSVPAnswer = RSVPAnswer.UNKNOWN,
     currentRsvpComment: String = "",
-    onUpdate: (rsvpAnswer: RSVPAnswer?, rsvpComment: String) -> Unit = { _, _ -> },
+    onUpdate: (rsvpAnswer: RSVPAnswer, rsvpComment: String) -> Unit = { _, _ -> },
+    isUpdating: Boolean = false,
 ) {
     var rsvpAnswer by rememberSaveable { mutableStateOf(currentRsvpAnswer) }
     var rsvpComment by rememberSaveable { mutableStateOf(currentRsvpComment) }
@@ -33,14 +34,14 @@ fun RoomActivityAnswerForm(
             .fillMaxWidth(),
         value = rsvpComment,
         onChange = { rsvpComment = it },
-        currentRsvpAnswer = rsvpAnswer,
+        rsvpAnswer = rsvpAnswer,
     )
     RSVPUpdateButton(
         modifier = Modifier
             .padding(start = 10.dp, end = 10.dp, top = 4.dp, bottom = 4.dp)
             .fillMaxWidth(),
         onClick = { onUpdate(rsvpAnswer, rsvpComment) },
-        enabled = hasChanged,
-        currentRsvpAnswer = rsvpAnswer,
+        enabled = hasChanged && !isUpdating,
+        rsvpAnswer = rsvpAnswer,
     )
 }

app/src/main/java/eu/steffo/twom/room/RoomActivityContent.kt

@@ -1,12 +1,17 @@
 package eu.steffo.twom.room
 
+import android.util.Log
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
-import androidx.compose.runtime.livedata.observeAsState
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.res.stringResource
 import eu.steffo.twom.R
@@ -14,7 +19,7 @@ import eu.steffo.twom.matrix.LocalSession
 import eu.steffo.twom.theme.ErrorText
 import eu.steffo.twom.theme.TwoMPadding
 import kotlinx.coroutines.launch
-import org.matrix.android.sdk.api.query.QueryStringValue
+import org.matrix.android.sdk.api.failure.Failure
 import kotlin.jvm.optionals.getOrNull
 
 
@@ -25,29 +30,56 @@ fun RoomActivityContent(
     val scope = rememberCoroutineScope()
 
     val session = LocalSession.current
-    val roomRequest = LocalRoom.current
-    val room = roomRequest?.getOrNull()
-    val roomSummaryRequest = LocalRoomSummary.current
-    val roomSummary = roomSummaryRequest?.getOrNull()
-
-    val myRsvp = room?.stateService()?.getStateEventLive(
-        eventType = "eu.steffo.twom.rsvp",
-        stateKey = QueryStringValue.Equals(session!!.myUserId),
-    )?.observeAsState()
-    // TODO: I stopped here; how to retrieve the RSVP from this?
-
-    Column(modifier) {
     if (session == null) {
         ErrorText(stringResource(R.string.room_error_session_missing))
-        } else if (roomRequest == null) {
+        return
+    }
+
+    val roomRequest = LocalRoom.current
+    if (roomRequest == null) {
         ErrorText(stringResource(R.string.room_error_room_missing))
-        } else if (!roomRequest.isPresent) {
+        return
+    }
+
+    val room = roomRequest.getOrNull()
+    if (room == null) {
         ErrorText(stringResource(R.string.room_error_room_notfound))
-        } else if (roomSummaryRequest == null) {
-            // Loading
-        } else if (!roomSummaryRequest.hasValue()) {
-            ErrorText(stringResource(R.string.room_error_room_notfound))
-        } else if (roomSummary != null) {
+        return
+    }
+
+    val roomSummaryRequest = LocalRoomSummary.current
+    if (roomSummaryRequest == null) {
+        ErrorText(stringResource(R.string.room_error_roomsummary_missing))
+        return
+    }
+
+    val roomSummary = roomSummaryRequest.getOrNull()
+    if (roomSummary == null) {
+        ErrorText(stringResource(R.string.room_error_roomsummary_notfound))
+        return
+    }
+
+    LaunchedEffect(roomSummary.otherMemberIds) ResolveUnknownUsers@{
+        // Resolve unknown users, one at a time
+        roomSummary.otherMemberIds.map {
+            if (session.userService().getUser(it) == null) {
+                Log.i("Room", "Resolving unknown user: $it")
+                session.userService().resolveUser(it)
+                Log.d("Room", "Successfully resolved unknown user: $it")
+            } else {
+                Log.v("Room", "Not resolving known user: $it")
+            }
+        }
+    }
+
+    val myRsvpRequest = observeRsvpAsLiveState(room = room, userId = session.myUserId)
+    val otherRsvpRequests =
+        roomSummary.otherMemberIds.map { it to observeRsvpAsLiveState(room = room, userId = it) }
+
+    var isUpdatingMyRsvp by rememberSaveable { mutableStateOf(false) }
+    var errorMyRsvp by rememberSaveable { mutableStateOf<Failure.ServerError?>(null) }
+
+    Column(modifier) {
         Row(TwoMPadding.base) {
             Text(
                 text = stringResource(R.string.room_topic_title),
@@ -66,11 +98,20 @@ fun RoomActivityContent(
         }
 
         RoomActivityAnswerForm(
-                currentRsvpAnswer = myRsvp,
-                currentRsvpComment = myRsvp,
+            // FIXME: This always set the request to UNKNOWN
+            currentRsvpAnswer = myRsvpRequest?.second ?: RSVPAnswer.UNKNOWN,
+            currentRsvpComment = myRsvpRequest?.third ?: "",
             onUpdate = { answer, comment ->
-                    scope.launch SendStateEvent@{
-                        room!!.stateService().sendStateEvent(
+                isUpdatingMyRsvp = true
+                errorMyRsvp = null
+
+                scope.launch SendRSVP@{
+                    Log.d(
+                        "Room",
+                        "Updating eu.steffo.twom.rsvp with answer `$answer` and comment `$comment`..."
+                    )
+                    try {
+                        room.stateService().sendStateEvent(
                             eventType = "eu.steffo.twom.rsvp",
                             stateKey = session.myUserId,
                             body = mapOf(
@@ -80,10 +121,51 @@ fun RoomActivityContent(
                                 )
                             ),
                         )
+                    } catch (error: Failure.ServerError) {
+                        Log.e("Room", "Failed to update eu.steffo.twom.rsvp: $error")
+                        errorMyRsvp = error
+                        isUpdatingMyRsvp = false
+                        return@SendRSVP
                     }
-                }
+                    Log.d(
+                        "Room",
+                        "Updated eu.steffo.twom.rsvp with answer `$answer` and comment `$comment`!"
                     )
 
+                    if (myRsvpRequest != null) {
+                        val myRsvpRequestEventId = myRsvpRequest.first.eventId
+                        Log.d(
+                            "Room",
+                            "Attempting to redact old eu.steffo.twom.rsvp event `${myRsvpRequestEventId}`..."
+                        )
+                        try {
+                            room.sendService()
+                                .redactEvent(myRsvpRequest.first, "Replaced with new information")
+                        } catch (error: Failure.ServerError) {
+                            Log.e("Room", "Failed to redact the old eu.steffo.twom.rsvp: $error")
+                            errorMyRsvp = error
+                            isUpdatingMyRsvp = false
+                            return@SendRSVP
+                        }
+                    } else {
+                        Log.d("Room", "Not doing anything else; there isn't anything to redact.")
+                    }
+
+                    isUpdatingMyRsvp = false
+                }
+            },
+            isUpdating = isUpdatingMyRsvp,
+        )
+
+        if (errorMyRsvp != null) {
+            // TODO: Maybe add an human-friendly error message?
+            Row(TwoMPadding.base) {
+                ErrorText(
+                    errorMyRsvp.toString()
+                )
+            }
+        }
+
         Row(TwoMPadding.base) {
             Text(
                 text = stringResource(R.string.room_invitees_title),
@@ -94,24 +176,15 @@ fun RoomActivityContent(
         Column(TwoMPadding.base) {
             MemberListItem(
                 memberId = LocalSession.current!!.myUserId,
-                    rsvpAnswer = rsvpAnswer,
-                    rsvpComment = rsvpComment,
+                rsvpAnswer = myRsvpRequest?.second ?: RSVPAnswer.UNKNOWN,
+                rsvpComment = myRsvpRequest?.third ?: "",
             )
 
-                roomSummary.otherMemberIds.forEach {
+            otherRsvpRequests.forEach {
                 MemberListItem(
-                        memberId = it,
-                        rsvpAnswer = null,
-                        rsvpComment = "",
-                    )
-                }
-            }
-        } else if (isError) {
-            Row(TwoMPadding.base) {
-                Text(
-                    // TODO: Maybe add a better error string
-                    text = stringResource(R.string.error),
-                    color = MaterialTheme.colorScheme.error,
+                    memberId = it.first,
+                    rsvpAnswer = it.second?.second ?: RSVPAnswer.UNKNOWN,
+                    rsvpComment = it.second?.third ?: "",
                 )
             }
         }

app/src/main/java/eu/steffo/twom/theme/colorRoleUnknown.kt

@@ -8,7 +8,7 @@ fun colorRoleUnknown(): StaticColorRole {
     return StaticColorRole(
         value = MaterialTheme.colorScheme.inverseSurface,
         onValue = MaterialTheme.colorScheme.inverseOnSurface,
-        valueContainer = MaterialTheme.colorScheme.surfaceVariant,
-        onValueContainer = MaterialTheme.colorScheme.onSurfaceVariant,
+        valueContainer = MaterialTheme.colorScheme.surface,
+        onValueContainer = MaterialTheme.colorScheme.onSurface,
     )
 }

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

@@ -58,4 +58,7 @@
     <string name="room_error_session_missing">The Matrix session context has not been initialized.</string>
     <string name="room_error_room_notfound">Could not find the requested Matrix room.</string>
     <string name="room_error_room_missing">The Matrix room context has not been initialized.</string>
+    <string name="room_rsvp_unknown_label">No answer</string>
+    <string name="room_error_roomsummary_missing">The Matrix room summary context has not been initialized.</string>
+    <string name="room_error_roomsummary_notfound">Could not find the requested Matrix room summary.</string>
 </resources>