/*
 * Copyright (C) 2022 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.content.Intent
import android.os.IBinder
import android.util.Log
import androidx.lifecycle.LifecycleService
import androidx.lifecycle.lifecycleScope
import com.android.systemui.dagger.qualifiers.Main
import com.android.systemui.shade.ShadeExpansionStateManager
import com.android.systemui.statusbar.phone.CentralSurfaces
import kotlinx.coroutines.CoroutineDispatcher
import kotlinx.coroutines.launch
import kotlinx.coroutines.withContext
import java.util.Optional
import javax.inject.Inject

/**
 * Provides state from the main SystemUI process on behalf of the Screenshot process.
 */
internal class ScreenshotProxyService @Inject constructor(
    private val mExpansionMgr: ShadeExpansionStateManager,
    private val mCentralSurfacesOptional: Optional<CentralSurfaces>,
    @Main private val mMainDispatcher: CoroutineDispatcher,
) : LifecycleService() {

    private val mBinder: IBinder = object : IScreenshotProxy.Stub() {
        /**
         * @return true when the notification shade is partially or fully expanded.
         */
        override fun isNotificationShadeExpanded(): Boolean {
            val expanded = !mExpansionMgr.isClosed()
            Log.d(TAG, "isNotificationShadeExpanded(): $expanded")
            return expanded
        }

        override fun dismissKeyguard(callback: IOnDoneCallback) {
            lifecycleScope.launch {
                executeAfterDismissing(callback)
            }
        }
    }

    private suspend fun executeAfterDismissing(callback: IOnDoneCallback) =
        withContext(mMainDispatcher) {
            mCentralSurfacesOptional.ifPresentOrElse(
                    {
                        it.executeRunnableDismissingKeyguard(
                                Runnable {
                                    callback.onDone(true)
                                }, null,
                                true /* dismissShade */, true /* afterKeyguardGone */,
                                true /* deferred */
                        )
                    },
                    { callback.onDone(false) }
            )
        }

    override fun onBind(intent: Intent): IBinder? {
        Log.d(TAG, "onBind: $intent")
        return mBinder
    }

    companion object {
        const val TAG = "ScreenshotProxyService"
    }
}