/*
 * Copyright 2020 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.riotx.features.home.room.list

import im.vector.matrix.android.api.session.room.model.RoomSummary
import javax.inject.Inject

class BreadcrumbsRoomComparator @Inject constructor(
        private val chronologicalRoomComparator: ChronologicalRoomComparator
) : Comparator<RoomSummary> {

    override fun compare(leftRoomSummary: RoomSummary?, rightRoomSummary: RoomSummary?): Int {
        val leftBreadcrumbsIndex = leftRoomSummary?.breadcrumbsIndex ?: RoomSummary.NOT_IN_BREADCRUMBS
        val rightBreadcrumbsIndex = rightRoomSummary?.breadcrumbsIndex ?: RoomSummary.NOT_IN_BREADCRUMBS

        return if (leftBreadcrumbsIndex == RoomSummary.NOT_IN_BREADCRUMBS) {
            if (rightBreadcrumbsIndex == RoomSummary.NOT_IN_BREADCRUMBS) {
                chronologicalRoomComparator.compare(leftRoomSummary, rightRoomSummary)
            } else {
                1
            }
        } else {
            if (rightBreadcrumbsIndex == RoomSummary.NOT_IN_BREADCRUMBS) {
                -1
            } else {
                leftBreadcrumbsIndex - rightBreadcrumbsIndex
            }
        }
    }
}
