/*
 * Copyright 2019 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 im.vector.matrix.android.internal.session.room.alias

import com.zhuinden.monarchy.Monarchy
import im.vector.matrix.android.api.util.Optional
import im.vector.matrix.android.internal.database.model.RoomSummaryEntity
import im.vector.matrix.android.internal.database.query.findByAlias
import im.vector.matrix.android.internal.network.executeRequest
import im.vector.matrix.android.internal.session.room.RoomAPI
import im.vector.matrix.android.internal.task.Task
import io.realm.Realm
import org.greenrobot.eventbus.EventBus
import javax.inject.Inject

internal interface GetRoomIdByAliasTask : Task<GetRoomIdByAliasTask.Params, Optional<String>> {
    data class Params(
            val roomAlias: String,
            val searchOnServer: Boolean
    )
}

internal class DefaultGetRoomIdByAliasTask @Inject constructor(
        private val monarchy: Monarchy,
        private val roomAPI: RoomAPI,
        private val eventBus: EventBus
) : GetRoomIdByAliasTask {

    override suspend fun execute(params: GetRoomIdByAliasTask.Params): Optional<String> {
        var roomId = Realm.getInstance(monarchy.realmConfiguration).use {
            RoomSummaryEntity.findByAlias(it, params.roomAlias)?.roomId
        }
        return if (roomId != null) {
            Optional.from(roomId)
        } else if (!params.searchOnServer) {
            Optional.from<String>(null)
        } else {
            roomId = executeRequest<RoomAliasDescription>(eventBus) {
                apiCall = roomAPI.getRoomIdByAlias(params.roomAlias)
            }.roomId
            Optional.from(roomId)
        }
    }
}
