/*
 * Copyright (c) 2023 New Vector Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package io.element.android.features.roomdetails.impl.rolesandpermissions

import androidx.compose.runtime.Composable
import androidx.compose.runtime.Stable
import androidx.compose.ui.Modifier
import androidx.lifecycle.lifecycleScope
import com.bumble.appyx.core.modality.BuildContext
import com.bumble.appyx.core.node.Node
import com.bumble.appyx.core.plugin.Plugin
import com.bumble.appyx.core.plugin.plugins
import dagger.assisted.Assisted
import dagger.assisted.AssistedInject
import io.element.android.anvilannotations.ContributesNode
import io.element.android.libraries.di.RoomScope
import io.element.android.libraries.matrix.api.room.MatrixRoom
import io.element.android.libraries.matrix.api.room.RoomMember
import kotlinx.coroutines.flow.collect
import kotlinx.coroutines.flow.filter
import kotlinx.coroutines.flow.onEach
import kotlinx.coroutines.flow.take
import kotlinx.coroutines.launch

@ContributesNode(RoomScope::class)
class RolesAndPermissionsNode @AssistedInject constructor(
    @Assisted buildContext: BuildContext,
    @Assisted plugins: List<Plugin>,
    private val presenter: RolesAndPermissionsPresenter,
    private val room: MatrixRoom,
) : Node(buildContext, plugins = plugins), RolesAndPermissionsNavigator {
    interface Callback : Plugin, RolesAndPermissionsNavigator {
        override fun openAdminList()
        override fun openModeratorList()
        override fun openEditRoomDetailsPermissions()
        override fun openMessagesAndContentPermissions()
        override fun openModerationPermissions()
        override fun onBackClick() {}
    }

    private val callback = plugins<Callback>().first()

    @Stable
    private val navigator = object : RolesAndPermissionsNavigator by callback {
        override fun onBackClick() {
            navigateUp()
        }
    }

    override fun onBuilt() {
        super.onBuilt()

        // If the user is not an admin anymore, exit this section since they won't have permissions to use it
        lifecycleScope.launch {
            room.roomInfoFlow
                .filter { info ->
                    info.userPowerLevels[room.sessionId] != RoomMember.Role.ADMIN.powerLevel
                }
                .take(1)
                .onEach { navigateUp() }
                .collect()
        }
    }

    @Composable
    override fun View(modifier: Modifier) {
        val state = presenter.present()
        RolesAndPermissionsView(
            state = state,
            rolesAndPermissionsNavigator = navigator,
            modifier = modifier,
        )
    }
}

interface RolesAndPermissionsNavigator {
    fun onBackClick() {}
    fun openAdminList() {}
    fun openModeratorList() {}
    fun openEditRoomDetailsPermissions() {}
    fun openMessagesAndContentPermissions() {}
    fun openModerationPermissions() {}
}
