/*
 * Copyright 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.wm.shell.common.transition

import com.android.wm.shell.dagger.WMSingleton
import com.android.wm.shell.recents.RecentsTransitionHandler
import com.android.wm.shell.recents.RecentsTransitionStateListener
import com.android.wm.shell.recents.RecentsTransitionStateListener.RecentsTransitionState
import com.android.wm.shell.recents.RecentsTransitionStateListener.isRunning
import com.android.wm.shell.sysui.ShellInit
import javax.inject.Inject

/**
 * Holder for the state of the transitions.
 */
@WMSingleton
class TransitionStateHolder @Inject constructor(
    shellInit: ShellInit,
    private val recentsTransitionHandler: RecentsTransitionHandler
) {

    @Volatile
    @RecentsTransitionState
    private var recentsTransitionState: Int =
        RecentsTransitionStateListener.TRANSITION_STATE_NOT_RUNNING

    init {
        shellInit.addInitCallback({ onInit() }, this)
    }

    fun isRecentsTransitionRunning(): Boolean = isRunning(recentsTransitionState)

    private fun onInit() {
        recentsTransitionHandler.addTransitionStateListener(
            object : RecentsTransitionStateListener {
                override fun onTransitionStateChanged(@RecentsTransitionState state: Int) {
                    recentsTransitionState = state
                }
            }
        )
    }
}