/*
 * 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.media

import android.app.ActivityOptions
import android.content.Intent
import android.content.res.Configuration
import android.content.res.Resources
import android.media.projection.IMediaProjection
import android.media.projection.IMediaProjectionManager.EXTRA_USER_REVIEW_GRANTED_CONSENT
import android.media.projection.MediaProjectionManager.EXTRA_MEDIA_PROJECTION
import android.media.projection.ReviewGrantedConsentResult.RECORD_CANCEL
import android.media.projection.ReviewGrantedConsentResult.RECORD_CONTENT_TASK
import android.os.Binder
import android.os.Bundle
import android.os.IBinder
import android.os.ResultReceiver
import android.os.UserHandle
import android.util.Log
import android.view.View
import android.view.ViewGroup
import android.view.accessibility.AccessibilityEvent
import androidx.lifecycle.Lifecycle
import androidx.lifecycle.LifecycleOwner
import androidx.lifecycle.LifecycleRegistry
import com.android.internal.annotations.VisibleForTesting
import com.android.internal.app.AbstractMultiProfilePagerAdapter.EmptyStateProvider
import com.android.internal.app.AbstractMultiProfilePagerAdapter.MyUserIdProvider
import com.android.internal.app.ChooserActivity
import com.android.internal.app.ResolverListController
import com.android.internal.app.chooser.NotSelectableTargetInfo
import com.android.internal.app.chooser.TargetInfo
import com.android.internal.widget.RecyclerView
import com.android.internal.widget.RecyclerViewAccessibilityDelegate
import com.android.internal.widget.ResolverDrawerLayout
import com.android.systemui.R
import com.android.systemui.mediaprojection.appselector.MediaProjectionAppSelectorComponent
import com.android.systemui.mediaprojection.appselector.MediaProjectionAppSelectorController
import com.android.systemui.mediaprojection.appselector.MediaProjectionAppSelectorResultHandler
import com.android.systemui.mediaprojection.appselector.MediaProjectionAppSelectorView
import com.android.systemui.mediaprojection.appselector.data.RecentTask
import com.android.systemui.mediaprojection.appselector.view.MediaProjectionRecentsViewController
import com.android.systemui.statusbar.policy.ConfigurationController
import com.android.systemui.util.AsyncActivityLauncher
import javax.inject.Inject

class MediaProjectionAppSelectorActivity(
    private val componentFactory: MediaProjectionAppSelectorComponent.Factory,
    private val activityLauncher: AsyncActivityLauncher,
    /** This is used to override the dependency in a screenshot test */
    @VisibleForTesting
    private val listControllerFactory: ((userHandle: UserHandle) -> ResolverListController)?
) :
    ChooserActivity(),
    MediaProjectionAppSelectorView,
    MediaProjectionAppSelectorResultHandler,
    LifecycleOwner {

    @Inject
    constructor(
        componentFactory: MediaProjectionAppSelectorComponent.Factory,
        activityLauncher: AsyncActivityLauncher
    ) : this(componentFactory, activityLauncher, listControllerFactory = null)

    private val lifecycleRegistry = LifecycleRegistry(this)
    override val lifecycle = lifecycleRegistry
    private lateinit var configurationController: ConfigurationController
    private lateinit var controller: MediaProjectionAppSelectorController
    private lateinit var recentsViewController: MediaProjectionRecentsViewController
    private lateinit var component: MediaProjectionAppSelectorComponent
    // Indicate if we are under the media projection security flow
    // i.e. when a host app reuses consent token, review the permission and update it to the service
    private var reviewGrantedConsentRequired = false
    // If an app is selected, set to true so that we don't send RECORD_CANCEL in onDestroy
    private var taskSelected = false

    override fun getLayoutResource() = R.layout.media_projection_app_selector

    public override fun onCreate(bundle: Bundle?) {
        lifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_CREATE)
        component = componentFactory.create(activity = this, view = this, resultHandler = this)
        component.lifecycleObservers.forEach { lifecycle.addObserver(it) }

        // Create a separate configuration controller for this activity as the configuration
        // might be different from the global one
        configurationController = component.configurationController
        controller = component.controller
        recentsViewController = component.recentsViewController

        intent.configureChooserIntent(
            resources,
            component.hostUserHandle,
            component.personalProfileUserHandle
        )

        reviewGrantedConsentRequired =
            intent.getBooleanExtra(EXTRA_USER_REVIEW_GRANTED_CONSENT, false)

        super.onCreate(bundle)
        controller.init()
        // we override AppList's AccessibilityDelegate set in ResolverActivity.onCreate because in
        // our case this delegate must extend RecyclerViewAccessibilityDelegate, otherwise
        // RecyclerView scrolling is broken
        setAppListAccessibilityDelegate()
    }

    override fun onStart() {
        super.onStart()
        lifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_START)
    }

    override fun onResume() {
        super.onResume()
        lifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_RESUME)
    }

    override fun onPause() {
        lifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_PAUSE)
        super.onPause()
    }

    override fun onStop() {
        lifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_STOP)
        super.onStop()
    }

    override fun onConfigurationChanged(newConfig: Configuration) {
        super.onConfigurationChanged(newConfig)
        configurationController.onConfigurationChanged(newConfig)
    }

    override fun appliedThemeResId(): Int = R.style.Theme_SystemUI_MediaProjectionAppSelector

    override fun createBlockerEmptyStateProvider(): EmptyStateProvider =
        component.emptyStateProvider

    override fun createListController(userHandle: UserHandle): ResolverListController =
        listControllerFactory?.invoke(userHandle) ?: super.createListController(userHandle)

    override fun startSelected(which: Int, always: Boolean, filtered: Boolean) {
        val currentListAdapter = mChooserMultiProfilePagerAdapter.activeListAdapter
        val targetInfo = currentListAdapter.targetInfoForPosition(which, filtered) ?: return
        if (targetInfo is NotSelectableTargetInfo) return

        val intent = createIntent(targetInfo)

        val launchToken: IBinder = Binder("media_projection_launch_token")
        val activityOptions = ActivityOptions.makeBasic()
        activityOptions.launchCookie = launchToken

        val userHandle = mMultiProfilePagerAdapter.activeListAdapter.userHandle

        // Launch activity asynchronously and wait for the result, launching of an activity
        // is typically very fast, so we don't show any loaders.
        // We wait for the activity to be launched to make sure that the window of the activity
        // is created and ready to be captured.
        val activityStarted =
            activityLauncher.startActivityAsUser(intent, userHandle, activityOptions.toBundle()) {
                returnSelectedApp(launchToken)
            }

        // Rely on the ActivityManager to pop up a dialog regarding app suspension
        // and return false if suspended
        if (!targetInfo.isSuspended && activityStarted) {
            // TODO(b/222078415) track activity launch
        }
    }

    private fun createIntent(target: TargetInfo): Intent {
        val intent = Intent(target.resolvedIntent)

        // Launch the app in a new task, so it won't be in the host's app task
        intent.flags = intent.flags or Intent.FLAG_ACTIVITY_NEW_TASK

        // Remove activity forward result flag as this activity will
        // return the media projection session
        intent.flags = intent.flags and Intent.FLAG_ACTIVITY_FORWARD_RESULT.inv()

        return intent
    }

    override fun onDestroy() {
        lifecycleRegistry.handleLifecycleEvent(Lifecycle.Event.ON_DESTROY)
        component.lifecycleObservers.forEach { lifecycle.removeObserver(it) }
        // onDestroy is also called when an app is selected, in that case we only want to send
        // RECORD_CONTENT_TASK but not RECORD_CANCEL
        if (!taskSelected) {
            // TODO(b/272010156): Return result to PermissionActivity and update service there
            MediaProjectionServiceHelper.setReviewedConsentIfNeeded(
                RECORD_CANCEL,
                reviewGrantedConsentRequired,
                /* projection= */ null
            )
        }
        activityLauncher.destroy()
        controller.destroy()
        super.onDestroy()
    }

    override fun onActivityStarted(cti: TargetInfo) {
        // do nothing
    }

    override fun bind(recentTasks: List<RecentTask>) {
        recentsViewController.bind(recentTasks)
        if (!hasWorkProfile()) {
            // Make sure to refresh the adapter, to show/hide the recents view depending on whether
            // there are recents or not.
            mMultiProfilePagerAdapter.personalListAdapter.notifyDataSetChanged()
        }
    }

    override fun returnSelectedApp(launchCookie: IBinder) {
        taskSelected = true
        if (intent.hasExtra(EXTRA_CAPTURE_REGION_RESULT_RECEIVER)) {
            // The client requested to return the result in the result receiver instead of
            // activity result, let's send the media projection to the result receiver
            val resultReceiver =
                intent.getParcelableExtra(
                    EXTRA_CAPTURE_REGION_RESULT_RECEIVER,
                    ResultReceiver::class.java
                ) as ResultReceiver
            val captureRegion = MediaProjectionCaptureTarget(launchCookie)
            val data = Bundle().apply { putParcelable(KEY_CAPTURE_TARGET, captureRegion) }
            resultReceiver.send(RESULT_OK, data)
            // TODO(b/279175710): Ensure consent result is always set here. Skipping this for now
            //  in ScreenMediaRecorder, since we know the permission grant (projection) is never
            //  reused in that scenario.
        } else {
            // TODO(b/272010156): Return result to PermissionActivity and update service there
            // Return the media projection instance as activity result
            val mediaProjectionBinder = intent.getIBinderExtra(EXTRA_MEDIA_PROJECTION)
            val projection = IMediaProjection.Stub.asInterface(mediaProjectionBinder)

            projection.launchCookie = launchCookie

            val intent = Intent()
            intent.putExtra(EXTRA_MEDIA_PROJECTION, projection.asBinder())
            setResult(RESULT_OK, intent)
            setForceSendResultForMediaProjection()
            MediaProjectionServiceHelper.setReviewedConsentIfNeeded(
                RECORD_CONTENT_TASK,
                reviewGrantedConsentRequired,
                projection
            )
        }

        finish()
    }

    override fun shouldGetOnlyDefaultActivities() = false

    override fun shouldShowContentPreview() =
        if (hasWorkProfile()) {
            // When the user has a work profile, we can always set this to true, and the layout is
            // adjusted automatically, and hide the recents view.
            true
        } else {
            // When there is no work profile, we should only show the content preview if there are
            // recents, otherwise the collapsed app selector will look empty.
            recentsViewController.hasRecentTasks
        }

    override fun shouldShowStickyContentPreviewWhenEmpty() = shouldShowContentPreview()

    override fun shouldShowServiceTargets() = false

    private fun hasWorkProfile() = mMultiProfilePagerAdapter.count > 1

    override fun createMyUserIdProvider(): MyUserIdProvider =
        object : MyUserIdProvider() {
            override fun getMyUserId(): Int = component.hostUserHandle.identifier
        }

    override fun createContentPreviewView(parent: ViewGroup): ViewGroup =
        recentsViewController.createView(parent)

    companion object {
        const val TAG = "MediaProjectionAppSelectorActivity"

        /**
         * When EXTRA_CAPTURE_REGION_RESULT_RECEIVER is passed as intent extra the activity will
         * send the [CaptureRegion] to the result receiver instead of returning media projection
         * instance through activity result.
         */
        const val EXTRA_CAPTURE_REGION_RESULT_RECEIVER = "capture_region_result_receiver"

        /** UID of the app that originally launched the media projection flow (host app user) */
        const val EXTRA_HOST_APP_USER_HANDLE = "launched_from_user_handle"
        const val KEY_CAPTURE_TARGET = "capture_region"

        /** Set up intent for the [ChooserActivity] */
        private fun Intent.configureChooserIntent(
            resources: Resources,
            hostUserHandle: UserHandle,
            personalProfileUserHandle: UserHandle
        ) {
            // Specify the query intent to show icons for all apps on the chooser screen
            val queryIntent =
                Intent(Intent.ACTION_MAIN).apply { addCategory(Intent.CATEGORY_LAUNCHER) }
            putExtra(Intent.EXTRA_INTENT, queryIntent)

            // Update the title of the chooser
            val title = resources.getString(R.string.screen_share_permission_app_selector_title)
            putExtra(Intent.EXTRA_TITLE, title)

            // Select host app's profile tab by default
            val selectedProfile =
                if (hostUserHandle == personalProfileUserHandle) {
                    PROFILE_PERSONAL
                } else {
                    PROFILE_WORK
                }
            putExtra(EXTRA_SELECTED_PROFILE, selectedProfile)
        }
    }

    private fun setAppListAccessibilityDelegate() {
        val rdl = requireViewById<ResolverDrawerLayout>(com.android.internal.R.id.contentPanel)
        for (i in 0 until mMultiProfilePagerAdapter.count) {
            val list =
                mMultiProfilePagerAdapter
                    .getItem(i)
                    .rootView
                    .findViewById<View>(com.android.internal.R.id.resolver_list)
            if (list == null || list !is RecyclerView) {
                Log.wtf(TAG, "MediaProjection only supports RecyclerView")
            } else {
                list.accessibilityDelegate = RecyclerViewExpandingAccessibilityDelegate(rdl, list)
            }
        }
    }

    /**
     * An a11y delegate propagating all a11y events to [AppListAccessibilityDelegate] so that it can
     * expand drawer when needed. It needs to extend [RecyclerViewAccessibilityDelegate] because
     * that superclass handles RecyclerView scrolling while using a11y services.
     */
    private class RecyclerViewExpandingAccessibilityDelegate(
        rdl: ResolverDrawerLayout,
        view: RecyclerView
    ) : RecyclerViewAccessibilityDelegate(view) {

        private val delegate = AppListAccessibilityDelegate(rdl)

        override fun onRequestSendAccessibilityEvent(
            host: ViewGroup,
            child: View,
            event: AccessibilityEvent
        ): Boolean {
            super.onRequestSendAccessibilityEvent(host, child, event)
            return delegate.onRequestSendAccessibilityEvent(host, child, event)
        }
    }
}