change(room permissions): fix some role&permissions inconsistencies after last changes

features/rolesandpermissions/impl/src/main/kotlin/io/element/android/features/rolesandpermissions/impl/roles/ChangeRolesPresenter.kt

@@ -36,6 +36,7 @@ import io.element.android.libraries.matrix.api.room.powerlevels.UserRoleChange
 import io.element.android.libraries.matrix.api.room.powerlevels.usersWithRole
 import io.element.android.libraries.matrix.api.room.toMatrixUser
 import io.element.android.libraries.matrix.api.user.MatrixUser
+import io.element.android.libraries.matrix.ui.model.powerLevelOf
 import io.element.android.libraries.matrix.ui.model.roleOf
 import io.element.android.libraries.matrix.ui.room.PowerLevelRoomMemberComparator
 import io.element.android.services.analytics.api.AnalyticsService
@@ -124,9 +125,10 @@ class ChangeRolesPresenter(
 
         val roomInfo by room.roomInfoFlow.collectAsState()
         fun canChangeMemberRole(userId: UserId): Boolean {
-            val currentUserRole = roomInfo.roleOf(room.sessionId)
-            val otherUserRole = roomInfo.roleOf(userId)
-            return currentUserRole.powerLevel > otherUserRole.powerLevel
+            val currentUserPowerLevel = roomInfo.powerLevelOf(room.sessionId)
+            val otherUserPowerLevel = roomInfo.powerLevelOf(userId)
+            return currentUserPowerLevel > otherUserPowerLevel &&
+                currentUserPowerLevel >= role.powerLevel
         }
 
         fun handleEvent(event: ChangeRolesEvent) {

features/rolesandpermissions/impl/src/main/kotlin/io/element/android/features/rolesandpermissions/impl/root/RolesAndPermissionsPresenter.kt

@@ -28,6 +28,7 @@ import io.element.android.libraries.matrix.api.room.powerlevels.UserRoleChange
 import io.element.android.libraries.matrix.api.room.powerlevels.userCountWithRole
 import io.element.android.libraries.matrix.ui.model.roleOf
 import io.element.android.services.analytics.api.AnalyticsService
+import kotlinx.collections.immutable.persistentListOf
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.launch
 
@@ -49,7 +50,16 @@ class RolesAndPermissionsPresenter(
             room.userCountWithRole { role -> role is RoomMember.Role.Admin || role is RoomMember.Role.Owner }
         }.collectAsState(null)
 
-        val canDemoteSelf = remember { derivedStateOf { roomInfo.roleOf(room.sessionId) !is RoomMember.Role.Owner } }
+        val availableDemoteActions by remember {
+            derivedStateOf {
+                val currentRole = roomInfo.roleOf(room.sessionId)
+                when (currentRole) {
+                    is RoomMember.Role.Admin -> persistentListOf(DemoteActions.ToModerator, DemoteActions.ToMember)
+                    is RoomMember.Role.Moderator -> persistentListOf(DemoteActions.ToMember)
+                    else -> persistentListOf()
+                }
+            }
+        }
         val changeOwnRoleAction = remember { mutableStateOf<AsyncAction<Unit>>(AsyncAction.Uninitialized) }
         val resetPermissionsAction = remember { mutableStateOf<AsyncAction<Unit>>(AsyncAction.Uninitialized) }
 
@@ -78,7 +88,7 @@ class RolesAndPermissionsPresenter(
             roomSupportsOwnerRole = roomInfo.privilegedCreatorRole,
             adminCount = adminCount,
             moderatorCount = moderatorCount,
-            canDemoteSelf = canDemoteSelf.value,
+            availableDemoteActions = availableDemoteActions,
             changeOwnRoleAction = changeOwnRoleAction.value,
             resetPermissionsAction = resetPermissionsAction.value,
             eventSink = ::handleEvent,

features/rolesandpermissions/impl/src/main/kotlin/io/element/android/features/rolesandpermissions/impl/root/RolesAndPermissionsState.kt

@@ -8,14 +8,24 @@
 
 package io.element.android.features.rolesandpermissions.impl.root
 
+import io.element.android.features.rolesandpermissions.impl.R
 import io.element.android.libraries.architecture.AsyncAction
+import io.element.android.libraries.matrix.api.room.RoomMember
+import kotlinx.collections.immutable.ImmutableList
 
 data class RolesAndPermissionsState(
     val roomSupportsOwnerRole: Boolean,
     val adminCount: Int?,
     val moderatorCount: Int?,
-    val canDemoteSelf: Boolean,
+    val availableDemoteActions: ImmutableList<DemoteActions>,
     val changeOwnRoleAction: AsyncAction<Unit>,
     val resetPermissionsAction: AsyncAction<Unit>,
     val eventSink: (RolesAndPermissionsEvents) -> Unit,
-)
+) {
+    val canDemoteSelf = availableDemoteActions.isNotEmpty()
+}
+
+enum class DemoteActions(val role: RoomMember.Role, val titleRes: Int) {
+    ToModerator(RoomMember.Role.Moderator, R.string.screen_room_roles_and_permissions_change_role_demote_to_moderator),
+    ToMember(RoomMember.Role.User, R.string.screen_room_roles_and_permissions_change_role_demote_to_member)
+}

features/rolesandpermissions/impl/src/main/kotlin/io/element/android/features/rolesandpermissions/impl/root/RolesAndPermissionsStateProvider.kt

@@ -10,6 +10,7 @@ package io.element.android.features.rolesandpermissions.impl.root
 
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
 import io.element.android.libraries.architecture.AsyncAction
+import kotlinx.collections.immutable.toImmutableList
 
 class RolesAndPermissionsStateProvider : PreviewParameterProvider<RolesAndPermissionsState> {
     override val values: Sequence<RolesAndPermissionsState>
@@ -46,7 +47,7 @@ class RolesAndPermissionsStateProvider : PreviewParameterProvider<RolesAndPermis
                 moderatorCount = 2,
                 resetPermissionsAction = AsyncAction.Failure(IllegalStateException("Failed to reset permissions")),
             ),
-            aRolesAndPermissionsState(canDemoteSelf = false),
+            aRolesAndPermissionsState(availableDemoteActions = emptyList()),
         )
 }
 
@@ -54,14 +55,14 @@ internal fun aRolesAndPermissionsState(
     roomSupportsOwners: Boolean = true,
     adminCount: Int = 0,
     moderatorCount: Int = 0,
-    canDemoteSelf: Boolean = true,
+    availableDemoteActions: List<DemoteActions> = listOf(DemoteActions.ToModerator, DemoteActions.ToMember),
     changeOwnRoleAction: AsyncAction<Unit> = AsyncAction.Uninitialized,
     resetPermissionsAction: AsyncAction<Unit> = AsyncAction.Uninitialized,
     eventSink: (RolesAndPermissionsEvents) -> Unit = {},
 ) = RolesAndPermissionsState(
     roomSupportsOwnerRole = roomSupportsOwners,
     adminCount = adminCount,
-    canDemoteSelf = canDemoteSelf,
+    availableDemoteActions = availableDemoteActions.toImmutableList(),
     moderatorCount = moderatorCount,
     changeOwnRoleAction = changeOwnRoleAction,
     resetPermissionsAction = resetPermissionsAction,

features/rolesandpermissions/impl/src/main/kotlin/io/element/android/features/rolesandpermissions/impl/root/RolesAndPermissionsView.kt

@@ -39,8 +39,8 @@ import io.element.android.libraries.designsystem.theme.components.ListSectionHea
 import io.element.android.libraries.designsystem.theme.components.ModalBottomSheet
 import io.element.android.libraries.designsystem.theme.components.Text
 import io.element.android.libraries.designsystem.theme.components.hide
-import io.element.android.libraries.matrix.api.room.RoomMember
 import io.element.android.libraries.ui.strings.CommonStrings
+import kotlinx.collections.immutable.ImmutableList
 
 @Composable
 fun RolesAndPermissionsView(
@@ -117,6 +117,7 @@ fun RolesAndPermissionsView(
     when (state.changeOwnRoleAction) {
         is AsyncAction.Confirming -> {
             ChangeOwnRoleBottomSheet(
+                availableDemoteActions = state.availableDemoteActions,
                 eventSink = state.eventSink,
             )
         }
@@ -136,6 +137,7 @@ fun RolesAndPermissionsView(
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
 private fun ChangeOwnRoleBottomSheet(
+    availableDemoteActions: ImmutableList<DemoteActions>,
     eventSink: (RolesAndPermissionsEvents) -> Unit,
 ) {
     val coroutineScope = rememberCoroutineScope()
@@ -164,24 +166,17 @@ private fun ChangeOwnRoleBottomSheet(
             style = ElementTheme.typography.fontBodyLgRegular,
             color = ElementTheme.colors.textPrimary,
         )
-        ListItem(
-            headlineContent = { Text(stringResource(R.string.screen_room_roles_and_permissions_change_role_demote_to_moderator)) },
-            onClick = {
-                sheetState.hide(coroutineScope) {
-                    eventSink(RolesAndPermissionsEvents.DemoteSelfTo(RoomMember.Role.Moderator))
-                }
-            },
-            style = ListItemStyle.Destructive,
-        )
-        ListItem(
-            headlineContent = { Text(stringResource(R.string.screen_room_roles_and_permissions_change_role_demote_to_member)) },
-            onClick = {
-                sheetState.hide(coroutineScope) {
-                    eventSink(RolesAndPermissionsEvents.DemoteSelfTo(RoomMember.Role.User))
-                }
-            },
-            style = ListItemStyle.Destructive,
-        )
+        for (demoteAction in availableDemoteActions) {
+            ListItem(
+                headlineContent = { Text(stringResource(demoteAction.titleRes)) },
+                onClick = {
+                    sheetState.hide(coroutineScope) {
+                        eventSink(RolesAndPermissionsEvents.DemoteSelfTo(demoteAction.role))
+                    }
+                },
+                style = ListItemStyle.Destructive,
+            )
+        }
         ListItem(
             headlineContent = { Text(stringResource(CommonStrings.action_cancel)) },
             onClick = ::dismiss,