/*
 * Copyright (C) 2023 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.screenshot

import android.media.MediaPlayer
import android.util.Log
import com.android.app.tracing.coroutines.asyncTraced as async
import com.android.systemui.dagger.qualifiers.Application
import com.android.systemui.dagger.qualifiers.Background
import javax.inject.Inject
import kotlin.time.Duration.Companion.seconds
import kotlinx.coroutines.CoroutineDispatcher
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Deferred
import kotlinx.coroutines.TimeoutCancellationException
import com.android.app.tracing.coroutines.launchTraced as launch
import kotlinx.coroutines.withContext
import kotlinx.coroutines.withTimeout

/** Controls sound reproduction after a screenshot is taken. */
interface ScreenshotSoundController {
    /** Reproduces the camera sound. */
    suspend fun playScreenshotSound()

    /**
     * Releases the sound. [playScreenshotSound] behaviour is undefined after this has been called.
     */
    suspend fun releaseScreenshotSound()

    /** Reproduces the camera sound. Used for compatibility with Java code. */
    fun playScreenshotSoundAsync()

    /**
     * Releases the sound. [playScreenshotSound] behaviour is undefined after this has been called.
     * Used for compatibility with Java code.
     */
    fun releaseScreenshotSoundAsync()
}

class ScreenshotSoundControllerImpl
@Inject
constructor(
    private val soundProvider: ScreenshotSoundProvider,
    @Application private val coroutineScope: CoroutineScope,
    @Background private val bgDispatcher: CoroutineDispatcher
) : ScreenshotSoundController {

    private val player: Deferred<MediaPlayer?> =
        coroutineScope.async("loadScreenshotSound", bgDispatcher) {
            try {
                soundProvider.getScreenshotSound()
            } catch (e: IllegalStateException) {
                Log.w(TAG, "Screenshot sound initialization failed", e)
                null
            }
        }

    override suspend fun playScreenshotSound() {
        withContext(bgDispatcher) {
            try {
                player.await()?.start()
            } catch (e: IllegalStateException) {
                Log.w(TAG, "Screenshot sound failed to play", e)
                releaseScreenshotSound()
            }
        }
    }

    override suspend fun releaseScreenshotSound() {
        withContext(bgDispatcher) {
            try {
                withTimeout(1.seconds) { player.await()?.release() }
            } catch (e: TimeoutCancellationException) {
                player.cancel()
                Log.w(TAG, "Error releasing shutter sound", e)
            }
        }
    }

    override fun playScreenshotSoundAsync() {
        coroutineScope.launch { playScreenshotSound() }
    }

    override fun releaseScreenshotSoundAsync() {
        coroutineScope.launch { releaseScreenshotSound() }
    }

    private companion object {
        const val TAG = "ScreenshotSoundControllerImpl"
    }
}