/*
 * Copyright (C) 2019 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.launcher3;

import static com.android.launcher3.AbstractFloatingView.TYPE_ALL;
import static com.android.launcher3.AbstractFloatingView.TYPE_HIDE_BACK_BUTTON;
import static com.android.launcher3.LauncherState.FLAG_HIDE_BACK_BUTTON;
import static com.android.launcher3.LauncherState.NORMAL;
import static com.android.quickstep.SysUINavigationMode.removeShelfFromOverview;
import static com.android.systemui.shared.system.ActivityManagerWrapper.CLOSE_SYSTEM_WINDOWS_REASON_HOME_KEY;

import android.animation.AnimatorSet;
import android.animation.ValueAnimator;
import android.content.Intent;
import android.content.IntentSender;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.CancellationSignal;

import com.android.launcher3.config.FeatureFlags;
import com.android.launcher3.hybridhotseat.HotseatPredictionController;
import com.android.launcher3.model.WellbeingModel;
import com.android.launcher3.popup.SystemShortcut;
import com.android.launcher3.proxy.ProxyActivityStarter;
import com.android.launcher3.proxy.StartActivityParams;
import com.android.launcher3.statehandlers.BackButtonAlphaHandler;
import com.android.launcher3.statehandlers.DepthController;
import com.android.launcher3.statemanager.StateManager.StateHandler;
import com.android.launcher3.uioverrides.RecentsViewStateController;
import com.android.launcher3.util.OnboardingPrefs;
import com.android.launcher3.util.UiThreadHelper;
import com.android.quickstep.RecentsModel;
import com.android.quickstep.SysUINavigationMode;
import com.android.quickstep.SysUINavigationMode.Mode;
import com.android.quickstep.SysUINavigationMode.NavigationModeChangeListener;
import com.android.quickstep.SystemUiProxy;
import com.android.quickstep.util.QuickstepOnboardingPrefs;
import com.android.quickstep.util.RemoteAnimationProvider;
import com.android.quickstep.util.RemoteFadeOutAnimationListener;
import com.android.quickstep.util.ShelfPeekAnim;
import com.android.quickstep.views.OverviewActionsView;
import com.android.quickstep.views.RecentsView;
import com.android.systemui.shared.system.ActivityManagerWrapper;
import com.android.systemui.shared.system.RemoteAnimationTargetCompat;

import java.util.stream.Stream;

/**
 * Extension of Launcher activity to provide quickstep specific functionality
 */
public abstract class BaseQuickstepLauncher extends Launcher
        implements NavigationModeChangeListener {

    private DepthController mDepthController = new DepthController(this);

    /**
     * Reusable command for applying the back button alpha on the background thread.
     */
    public static final UiThreadHelper.AsyncCommand SET_BACK_BUTTON_ALPHA =
            (context, arg1, arg2) -> SystemUiProxy.INSTANCE.get(context).setBackButtonAlpha(
                    Float.intBitsToFloat(arg1), arg2 != 0);

    private final ShelfPeekAnim mShelfPeekAnim = new ShelfPeekAnim(this);

    private OverviewActionsView mActionsView;
    protected HotseatPredictionController mHotseatPredictionController;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        SysUINavigationMode.INSTANCE.get(this).addModeChangeListener(this);
        addMultiWindowModeChangedListener(mDepthController);
    }

    @Override
    public void onDestroy() {
        SysUINavigationMode.INSTANCE.get(this).removeModeChangeListener(this);
        super.onDestroy();
    }

    @Override
    public void onNavigationModeChanged(Mode newMode) {
        getDragLayer().recreateControllers();
        if (mActionsView != null && isOverviewActionsEnabled()) {
            mActionsView.updateVerticalMargin(newMode);
        }
    }

    @Override
    public void onEnterAnimationComplete() {
        super.onEnterAnimationComplete();
        // After the transition to home, enable the high-res thumbnail loader if it wasn't enabled
        // as a part of quickstep, so that high-res thumbnails can load the next time we enter
        // overview
        RecentsModel.INSTANCE.get(this).getThumbnailCache()
                .getHighResLoadingState().setVisible(true);
    }

    @Override
    public void onTrimMemory(int level) {
        super.onTrimMemory(level);
        RecentsModel.INSTANCE.get(this).onTrimMemory(level);
    }

    @Override
    protected void onUiChangedWhileSleeping() {
        // Remove the snapshot because the content view may have obvious changes.
        ActivityManagerWrapper.getInstance().invalidateHomeTaskSnapshot(this);
    }

    @Override
    public void startIntentSenderForResult(IntentSender intent, int requestCode,
            Intent fillInIntent, int flagsMask, int flagsValues, int extraFlags, Bundle options) {
        if (requestCode != -1) {
            mPendingActivityRequestCode = requestCode;
            StartActivityParams params = new StartActivityParams(this, requestCode);
            params.intentSender = intent;
            params.fillInIntent = fillInIntent;
            params.flagsMask = flagsMask;
            params.flagsValues = flagsValues;
            params.extraFlags = extraFlags;
            params.options = options;
            startActivity(ProxyActivityStarter.getLaunchIntent(this, params));
        } else {
            super.startIntentSenderForResult(intent, requestCode, fillInIntent, flagsMask,
                    flagsValues, extraFlags, options);
        }
    }

    @Override
    public void startActivityForResult(Intent intent, int requestCode, Bundle options) {
        if (requestCode != -1) {
            mPendingActivityRequestCode = requestCode;
            StartActivityParams params = new StartActivityParams(this, requestCode);
            params.intent = intent;
            params.options = options;
            startActivity(ProxyActivityStarter.getLaunchIntent(this, params));
        } else {
            super.startActivityForResult(intent, requestCode, options);
        }
    }

    @Override
    protected void onDeferredResumed() {
        super.onDeferredResumed();
        if (mPendingActivityRequestCode != -1 && isInState(NORMAL)) {
            // Remove any active ProxyActivityStarter task and send RESULT_CANCELED to Launcher.
            onActivityResult(mPendingActivityRequestCode, RESULT_CANCELED, null);
            // ProxyActivityStarter is started with clear task to reset the task after which it
            // removes the task itself.
            startActivity(ProxyActivityStarter.getLaunchIntent(this, null));
        }
    }

    @Override
    protected void setupViews() {
        super.setupViews();

        SysUINavigationMode.INSTANCE.get(this).updateMode();
        mActionsView = findViewById(R.id.overview_actions_view);
        ((RecentsView) getOverviewPanel()).init(mActionsView);

        if (isOverviewActionsEnabled()) {
            // Overview is above all other launcher elements, including qsb, so move it to the top.
            getOverviewPanel().bringToFront();
            mActionsView.bringToFront();
            mActionsView.updateVerticalMargin(SysUINavigationMode.getMode(this));
        }
    }

    private boolean isOverviewActionsEnabled() {
        return FeatureFlags.ENABLE_OVERVIEW_ACTIONS.get() && removeShelfFromOverview(this);
    }

    public <T extends OverviewActionsView> T getActionsView() {
        return (T) mActionsView;
    }

    @Override
    protected void closeOpenViews(boolean animate) {
        super.closeOpenViews(animate);
        ActivityManagerWrapper.getInstance()
                .closeSystemWindows(CLOSE_SYSTEM_WINDOWS_REASON_HOME_KEY);
    }

    @Override
    protected StateHandler<LauncherState>[] createStateHandlers() {
        return new StateHandler[] {
                getAllAppsController(),
                getWorkspace(),
                getDepthController(),
                new RecentsViewStateController(this),
                new BackButtonAlphaHandler(this)};
    }

    public DepthController getDepthController() {
        return mDepthController;
    }

    @Override
    protected OnboardingPrefs createOnboardingPrefs(SharedPreferences sharedPrefs) {
        return new QuickstepOnboardingPrefs(this, sharedPrefs);
    }

    @Override
    public void useFadeOutAnimationForLauncherStart(CancellationSignal signal) {
        QuickstepAppTransitionManagerImpl appTransitionManager =
                (QuickstepAppTransitionManagerImpl) getAppTransitionManager();
        appTransitionManager.setRemoteAnimationProvider(new RemoteAnimationProvider() {
            @Override
            public AnimatorSet createWindowAnimation(RemoteAnimationTargetCompat[] appTargets,
                    RemoteAnimationTargetCompat[] wallpaperTargets) {

                // On the first call clear the reference.
                signal.cancel();

                ValueAnimator fadeAnimation = ValueAnimator.ofFloat(1, 0);
                fadeAnimation.addUpdateListener(new RemoteFadeOutAnimationListener(appTargets,
                        wallpaperTargets));
                AnimatorSet anim = new AnimatorSet();
                anim.play(fadeAnimation);
                return anim;
            }
        }, signal);
    }

    @Override
    public float[] getNormalOverviewScaleAndOffset() {
        return SysUINavigationMode.getMode(this) == Mode.NO_BUTTON
                ? new float[] {1, 1} : new float[] {1.1f, 0};
    }

    @Override
    public void onDragLayerHierarchyChanged() {
        onLauncherStateOrFocusChanged();
    }

    @Override
    protected void onActivityFlagsChanged(int changeBits) {
        if ((changeBits
                & (ACTIVITY_STATE_WINDOW_FOCUSED | ACTIVITY_STATE_TRANSITION_ACTIVE)) != 0) {
            onLauncherStateOrFocusChanged();
        }

        if ((changeBits & ACTIVITY_STATE_STARTED) != 0) {
            mDepthController.setActivityStarted(isStarted());
        }

        super.onActivityFlagsChanged(changeBits);
    }

    public boolean shouldBackButtonBeHidden(LauncherState toState) {
        Mode mode = SysUINavigationMode.getMode(this);
        boolean shouldBackButtonBeHidden = mode.hasGestures
                && toState.hasFlag(FLAG_HIDE_BACK_BUTTON)
                && hasWindowFocus()
                && (getActivityFlags() & ACTIVITY_STATE_TRANSITION_ACTIVE) == 0;
        if (shouldBackButtonBeHidden) {
            // Show the back button if there is a floating view visible.
            shouldBackButtonBeHidden = AbstractFloatingView.getTopOpenViewWithType(this,
                    TYPE_ALL & ~TYPE_HIDE_BACK_BUTTON) == null;
        }
        return shouldBackButtonBeHidden;
    }

    /**
     * Sets the back button visibility based on the current state/window focus.
     */
    private void onLauncherStateOrFocusChanged() {
        boolean shouldBackButtonBeHidden = shouldBackButtonBeHidden(getStateManager().getState());
        UiThreadHelper.setBackButtonAlphaAsync(this, SET_BACK_BUTTON_ALPHA,
                shouldBackButtonBeHidden ? 0f : 1f, true /* animate */);
        if (getDragLayer() != null) {
            getRootView().setDisallowBackGesture(shouldBackButtonBeHidden);
        }
    }

    @Override
    public void finishBindingItems(int pageBoundFirst) {
        super.finishBindingItems(pageBoundFirst);
        // Instantiate and initialize WellbeingModel now that its loading won't interfere with
        // populating workspace.
        // TODO: Find a better place for this
        WellbeingModel.INSTANCE.get(this);
    }

    @Override
    public Stream<SystemShortcut.Factory> getSupportedShortcuts() {
        return Stream.concat(super.getSupportedShortcuts(),
                Stream.of(WellbeingModel.SHORTCUT_FACTORY));
    }

    public ShelfPeekAnim getShelfPeekAnim() {
        return mShelfPeekAnim;
    }

    /**
     * Returns Prediction controller for hybrid hotseat
     */
    public HotseatPredictionController getHotseatPredictionController() {
        return mHotseatPredictionController;
    }

    public void setHintUserWillBeActive() {
        addActivityFlags(ACTIVITY_STATE_USER_WILL_BE_ACTIVE);
    }
}