/*
 * Copyright (C) 2024 The Android Open Source Project
 *
 * 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 com.android.systemui.qs.panels.ui.viewmodel

import com.android.systemui.lifecycle.ExclusiveActivatable
import com.android.systemui.lifecycle.Hydrator
import com.android.systemui.media.controls.ui.controller.MediaHierarchyManager.Companion.LOCATION_QS
import com.android.systemui.qs.panels.shared.model.SizedTileImpl
import com.android.systemui.qs.panels.ui.dialog.QSResetDialogDelegate
import com.android.systemui.qs.panels.ui.viewmodel.PaginatableViewModel.Companion.splitInRows
import com.android.systemui.qs.pipeline.shared.TileSpec
import com.android.systemui.qs.ui.viewmodel.QuickSettingsContainerViewModel
import dagger.assisted.AssistedFactory
import dagger.assisted.AssistedInject
import kotlinx.coroutines.awaitCancellation
import kotlinx.coroutines.coroutineScope
import kotlinx.coroutines.launch

class InfiniteGridViewModel
@AssistedInject
constructor(
    dynamicIconTilesViewModelFactory: DynamicIconTilesViewModel.Factory,
    val columnsWithMediaViewModelFactory: QSColumnsViewModel.Factory,
    val squishinessViewModel: TileSquishinessViewModel,
    val snapshotViewModelFactory: InfiniteGridSnapshotViewModel.Factory,
    val resetDialogDelegateFactory: QSResetDialogDelegate.Factory,
    val editTopBarActionsViewModelFactory: EditTopBarActionsViewModel.Factory,
) : ExclusiveActivatable(), PaginatableViewModel {
    private val hydrator = Hydrator("InfiniteGridViewModel.hydrator")

    val iconTilesViewModel = dynamicIconTilesViewModelFactory.create()
    val columnsWithMediaViewModel =
        columnsWithMediaViewModelFactory.create(
            LOCATION_QS,
            QuickSettingsContainerViewModel.mediaUiBehavior,
        )

    override val pageKeys: Array<Any>
        get() =
            arrayOf(
                columnsWithMediaViewModel.columns,
                columnsWithMediaViewModel.largeSpan,
                iconTilesViewModel.largeTilesState.value,
            )

    override fun splitIntoPages(tiles: List<TileViewModel>, rows: Int): List<List<TileViewModel>> {
        return splitInRows(
                tiles.map { SizedTileImpl(it, widthOf(it.spec)) },
                columnsWithMediaViewModel.columns,
            )
            .chunked(rows)
            .map { it.flatten().map { it.tile } }
    }

    private fun widthOf(spec: TileSpec): Int {
        return if (iconTilesViewModel.largeTilesState.value.contains(spec))
            columnsWithMediaViewModel.largeSpan
        else 1
    }

    override suspend fun onActivated(): Nothing {
        coroutineScope {
            launch { iconTilesViewModel.activate() }
            launch { columnsWithMediaViewModel.activate() }
            launch { hydrator.activate() }
            awaitCancellation()
        }
    }

    @AssistedFactory
    interface Factory : PaginatableViewModel.Factory {
        override fun create(): InfiniteGridViewModel
    }
}