/*
 * Copyright (C) 2021 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.taskbar;

import static android.content.Context.RECEIVER_NOT_EXPORTED;
import static android.content.pm.PackageManager.FEATURE_PC;
import static android.view.Display.DEFAULT_DISPLAY;
import static android.view.WindowManager.LayoutParams.TYPE_NAVIGATION_BAR_PANEL;

import static com.android.launcher3.util.DisplayController.CHANGE_DENSITY;
import static com.android.launcher3.util.DisplayController.CHANGE_NAVIGATION_MODE;
import static com.android.launcher3.util.DisplayController.TASKBAR_NOT_DESTROYED_TAG;
import static com.android.launcher3.util.Executors.UI_HELPER_EXECUTOR;
import static com.android.launcher3.util.FlagDebugUtils.formatFlagChange;

import android.annotation.SuppressLint;
import android.app.PendingIntent;
import android.content.ComponentCallbacks;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.ActivityInfo;
import android.content.res.Configuration;
import android.hardware.display.DisplayManager;
import android.net.Uri;
import android.os.Handler;
import android.os.SystemProperties;
import android.provider.Settings;
import android.util.Log;
import android.view.Display;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.VisibleForTesting;

import com.android.launcher3.DeviceProfile;
import com.android.launcher3.LauncherAppState;
import com.android.launcher3.anim.AnimatorPlaybackController;
import com.android.launcher3.statemanager.StatefulActivity;
import com.android.launcher3.taskbar.unfold.NonDestroyableScopedUnfoldTransitionProgressProvider;
import com.android.launcher3.uioverrides.QuickstepLauncher;
import com.android.launcher3.util.DisplayController;
import com.android.launcher3.util.NavigationMode;
import com.android.launcher3.util.SettingsCache;
import com.android.launcher3.util.SimpleBroadcastReceiver;
import com.android.quickstep.RecentsActivity;
import com.android.quickstep.SystemUiProxy;
import com.android.quickstep.TouchInteractionService;
import com.android.systemui.shared.system.QuickStepContract;
import com.android.systemui.unfold.UnfoldTransitionProgressProvider;
import com.android.systemui.unfold.util.ScopedUnfoldTransitionProgressProvider;

import java.io.PrintWriter;
import java.util.StringJoiner;

/**
 * Class to manage taskbar lifecycle
 */
public class TaskbarManager {
    private static final String TAG = "TaskbarManager";
    private static final boolean DEBUG = false;

    public static final boolean FLAG_HIDE_NAVBAR_WINDOW =
            SystemProperties.getBoolean("persist.wm.debug.hide_navbar_window", false);

    private static final Uri USER_SETUP_COMPLETE_URI = Settings.Secure.getUriFor(
            Settings.Secure.USER_SETUP_COMPLETE);

    private static final Uri NAV_BAR_KIDS_MODE = Settings.Secure.getUriFor(
            Settings.Secure.NAV_BAR_KIDS_MODE);

    private final Context mContext;
    private final DisplayController mDisplayController;
    private final TaskbarNavButtonController mNavButtonController;
    private final SettingsCache.OnChangeListener mUserSetupCompleteListener;
    private final SettingsCache.OnChangeListener mNavBarKidsModeListener;
    private final ComponentCallbacks mComponentCallbacks;
    private final SimpleBroadcastReceiver mShutdownReceiver;

    // The source for this provider is set when Launcher is available
    // We use 'non-destroyable' version here so the original provider won't be destroyed
    // as it is tied to the activity lifecycle, not the taskbar lifecycle.
    // It's destruction/creation will be managed by the activity.
    private final ScopedUnfoldTransitionProgressProvider mUnfoldProgressProvider =
            new NonDestroyableScopedUnfoldTransitionProgressProvider();
    private NavigationMode mNavMode;

    private TaskbarActivityContext mTaskbarActivityContext;
    private StatefulActivity mActivity;
    /**
     * Cache a copy here so we can initialize state whenever taskbar is recreated, since
     * this class does not get re-initialized w/ new taskbars.
     */
    private final TaskbarSharedState mSharedState = new TaskbarSharedState();

    /**
     * We use WindowManager's ComponentCallbacks() for most of the config changes, however for
     * navigation mode, that callback gets called too soon, before it's internal navigation mode
     * reflects the current one.
     * DisplayController's callback is delayed enough to get the correct nav mode value
     *
     * We also use density change here because DeviceProfile has had a chance to update it's state
     * whereas density for component callbacks registered in this class don't update DeviceProfile.
     * Confused? Me too. Make it less confusing (TODO: b/227669780)
     *
     * Flags used with {@link #mDispInfoChangeListener}
     */
    private static final int CHANGE_FLAGS = CHANGE_NAVIGATION_MODE | CHANGE_DENSITY;
    private final DisplayController.DisplayInfoChangeListener mDispInfoChangeListener;

    private boolean mUserUnlocked = false;

    public static final int SYSTEM_ACTION_ID_TASKBAR = 499;

    /**
     * For Taskbar broadcast intent filter.
     */
    public static final String ACTION_SHOW_TASKBAR = "ACTION_SHOW_TASKBAR";

    private final SimpleBroadcastReceiver mTaskbarBroadcastReceiver =
            new SimpleBroadcastReceiver(this::showTaskbarFromBroadcast);

    @SuppressLint("WrongConstant")
    public TaskbarManager(TouchInteractionService service) {
        mDisplayController = DisplayController.INSTANCE.get(service);
        Display display =
                service.getSystemService(DisplayManager.class).getDisplay(DEFAULT_DISPLAY);
        mContext = service.createWindowContext(display, TYPE_NAVIGATION_BAR_PANEL, null);
        mNavButtonController = new TaskbarNavButtonController(service,
                SystemUiProxy.INSTANCE.get(mContext), new Handler());
        mUserSetupCompleteListener = isUserSetupComplete -> recreateTaskbar();
        mNavBarKidsModeListener = isNavBarKidsMode -> recreateTaskbar();
        // TODO(b/227669780): Consolidate this w/ DisplayController callbacks
        mComponentCallbacks = new ComponentCallbacks() {
            private Configuration mOldConfig = mContext.getResources().getConfiguration();

            @Override
            public void onConfigurationChanged(Configuration newConfig) {
                debugWhyTaskbarNotDestroyed(
                        "TaskbarManager#mComponentCallbacks.onConfigurationChanged: " + newConfig);
                DeviceProfile dp = mUserUnlocked
                        ? LauncherAppState.getIDP(mContext).getDeviceProfile(mContext)
                        : null;
                int configDiff = mOldConfig.diff(newConfig);
                int configDiffForRecreate = configDiff;
                int configsRequiringRecreate = ActivityInfo.CONFIG_ASSETS_PATHS
                        | ActivityInfo.CONFIG_LAYOUT_DIRECTION | ActivityInfo.CONFIG_UI_MODE
                        | ActivityInfo.CONFIG_SCREEN_SIZE;
                if ((configDiff & ActivityInfo.CONFIG_SCREEN_SIZE) != 0
                        && mTaskbarActivityContext != null && dp != null
                        && !isPhoneMode(dp)) {
                    // Additional check since this callback gets fired multiple times w/o
                    // screen size changing, or when simply rotating the device.
                    // In the case of phone device rotation, we do want to call recreateTaskbar()
                    DeviceProfile oldDp = mTaskbarActivityContext.getDeviceProfile();
                    boolean isOrientationChange =
                            (configDiff & ActivityInfo.CONFIG_ORIENTATION) != 0;
                    int oldWidth = isOrientationChange ? oldDp.heightPx : oldDp.widthPx;
                    int oldHeight = isOrientationChange ? oldDp.widthPx : oldDp.heightPx;
                    if (dp.widthPx == oldWidth && dp.heightPx == oldHeight) {
                        configDiffForRecreate &= ~ActivityInfo.CONFIG_SCREEN_SIZE;
                    }
                }
                if ((configDiff & ActivityInfo.CONFIG_UI_MODE) != 0) {
                    // Only recreate for theme changes, not other UI mode changes such as docking.
                    int oldUiNightMode = (mOldConfig.uiMode & Configuration.UI_MODE_NIGHT_MASK);
                    int newUiNightMode = (newConfig.uiMode & Configuration.UI_MODE_NIGHT_MASK);
                    if (oldUiNightMode == newUiNightMode) {
                        configDiffForRecreate &= ~ActivityInfo.CONFIG_UI_MODE;
                    }
                }

                debugWhyTaskbarNotDestroyed("ComponentCallbacks#onConfigurationChanged() "
                        + "configDiffForRecreate="
                        + Configuration.configurationDiffToString(configDiffForRecreate));
                if ((configDiffForRecreate & configsRequiringRecreate) != 0) {
                    recreateTaskbar();
                } else {
                    // Config change might be handled without re-creating the taskbar
                    if (mTaskbarActivityContext != null) {
                        if (dp != null && !isTaskbarPresent(dp)) {
                            destroyExistingTaskbar();
                        } else {
                            if (dp != null && isTaskbarPresent(dp)) {
                                mTaskbarActivityContext.updateDeviceProfile(dp, mNavMode);
                            }
                            mTaskbarActivityContext.onConfigurationChanged(configDiff);
                        }
                    }
                }
                mOldConfig = newConfig;
            }

            @Override
            public void onLowMemory() { }
        };
        mShutdownReceiver = new SimpleBroadcastReceiver(i ->
                destroyExistingTaskbar());
        mDispInfoChangeListener = (context, info, flags) -> {
            if ((flags & CHANGE_FLAGS) != 0) {
                mNavMode = info.navigationMode;
                recreateTaskbar();
            }
            debugWhyTaskbarNotDestroyed("DisplayInfoChangeListener#"
                    + mDisplayController.getChangeFlagsString(flags));
        };
        mNavMode = mDisplayController.getInfo().navigationMode;
        mDisplayController.addChangeListener(mDispInfoChangeListener);
        SettingsCache.INSTANCE.get(mContext).register(USER_SETUP_COMPLETE_URI,
                mUserSetupCompleteListener);
        SettingsCache.INSTANCE.get(mContext).register(NAV_BAR_KIDS_MODE,
                mNavBarKidsModeListener);
        mContext.registerComponentCallbacks(mComponentCallbacks);
        mShutdownReceiver.register(mContext, Intent.ACTION_SHUTDOWN);
        UI_HELPER_EXECUTOR.execute(() -> {
            mSharedState.taskbarSystemActionPendingIntent = PendingIntent.getBroadcast(
                    mContext,
                    SYSTEM_ACTION_ID_TASKBAR,
                    new Intent(ACTION_SHOW_TASKBAR).setPackage(mContext.getPackageName()),
                    PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_IMMUTABLE);
            mContext.registerReceiver(
                    mTaskbarBroadcastReceiver,
                    new IntentFilter(ACTION_SHOW_TASKBAR),
                    RECEIVER_NOT_EXPORTED);
        });

        debugWhyTaskbarNotDestroyed("TaskbarManager created");
        recreateTaskbar();
    }

    private void destroyExistingTaskbar() {
        debugWhyTaskbarNotDestroyed("destroyExistingTaskbar: " + mTaskbarActivityContext);
        if (mTaskbarActivityContext != null) {
            mTaskbarActivityContext.onDestroy();
            if (!FLAG_HIDE_NAVBAR_WINDOW) {
                mTaskbarActivityContext = null;
            }
        }
    }

    /**
     * Show Taskbar upon receiving broadcast
     */
    private void showTaskbarFromBroadcast(Intent intent) {
        if (ACTION_SHOW_TASKBAR.equals(intent.getAction()) && mTaskbarActivityContext != null) {
            mTaskbarActivityContext.showTaskbarFromBroadcast();
        }
    }

    /**
     * Displays a frame of the first Launcher reveal animation.
     *
     * This should be used to run a first Launcher reveal animation whose progress matches a swipe
     * progress.
     */
    public AnimatorPlaybackController createLauncherStartFromSuwAnim(int duration) {
        return mTaskbarActivityContext == null
                ? null : mTaskbarActivityContext.createLauncherStartFromSuwAnim(duration);
    }

    /**
     * Called when the user is unlocked
     */
    public void onUserUnlocked() {
        mUserUnlocked = true;
        recreateTaskbar();
    }

    /**
     * Sets a {@link StatefulActivity} to act as taskbar callback
     */
    public void setActivity(@NonNull StatefulActivity activity) {
        if (mActivity == activity) {
            return;
        }
        if (mActivity != null) {
            mActivity.removeOnDeviceProfileChangeListener(mDebugActivityDeviceProfileChanged);
        }
        mActivity = activity;
        debugWhyTaskbarNotDestroyed("Set mActivity=" + mActivity);
        mActivity.addOnDeviceProfileChangeListener(mDebugActivityDeviceProfileChanged);
        UnfoldTransitionProgressProvider unfoldTransitionProgressProvider =
                getUnfoldTransitionProgressProviderForActivity(activity);
        mUnfoldProgressProvider.setSourceProvider(unfoldTransitionProgressProvider);

        if (mTaskbarActivityContext != null) {
            mTaskbarActivityContext.setUIController(
                    createTaskbarUIControllerForActivity(mActivity));
        }
    }

    /**
     * Returns an {@link UnfoldTransitionProgressProvider} to use while the given StatefulActivity
     * is active.
     */
    private UnfoldTransitionProgressProvider getUnfoldTransitionProgressProviderForActivity(
            StatefulActivity activity) {
        if (activity instanceof QuickstepLauncher) {
            return ((QuickstepLauncher) activity).getUnfoldTransitionProgressProvider();
        }
        return null;
    }

    /**
     * Creates a {@link TaskbarUIController} to use while the given StatefulActivity is active.
     */
    private TaskbarUIController createTaskbarUIControllerForActivity(StatefulActivity activity) {
        if (activity instanceof QuickstepLauncher) {
            if (mTaskbarActivityContext.getPackageManager().hasSystemFeature(FEATURE_PC)) {
                return new DesktopTaskbarUIController((QuickstepLauncher) activity);
            }
            return new LauncherTaskbarUIController((QuickstepLauncher) activity);
        }
        if (activity instanceof RecentsActivity) {
            return new FallbackTaskbarUIController((RecentsActivity) activity);
        }
        return TaskbarUIController.DEFAULT;
    }

    /**
     * Clears a previously set {@link StatefulActivity}
     */
    public void clearActivity(@NonNull StatefulActivity activity) {
        if (mActivity == activity) {
            mActivity.removeOnDeviceProfileChangeListener(mDebugActivityDeviceProfileChanged);
            mActivity = null;
            debugWhyTaskbarNotDestroyed("clearActivity");
            if (mTaskbarActivityContext != null) {
                mTaskbarActivityContext.setUIController(TaskbarUIController.DEFAULT);
            }
            mUnfoldProgressProvider.setSourceProvider(null);
        }
    }

    /**
     * This method is called multiple times (ex. initial init, then when user unlocks) in which case
     * we fully want to destroy an existing taskbar and create a new one.
     * In other case (folding/unfolding) we don't need to remove and add window.
     */
    @VisibleForTesting
    public void recreateTaskbar() {
        DeviceProfile dp = mUserUnlocked ?
                LauncherAppState.getIDP(mContext).getDeviceProfile(mContext) : null;

        destroyExistingTaskbar();

        boolean isTaskbarEnabled = dp != null && isTaskbarPresent(dp);
        debugWhyTaskbarNotDestroyed("recreateTaskbar: isTaskbarEnabled=" + isTaskbarEnabled
                + " [dp != null (i.e. mUserUnlocked)]=" + (dp != null)
                + " FLAG_HIDE_NAVBAR_WINDOW=" + FLAG_HIDE_NAVBAR_WINDOW
                + " dp.isTaskbarPresent=" + (dp == null ? "null" : dp.isTaskbarPresent));
        if (!isTaskbarEnabled) {
            SystemUiProxy.INSTANCE.get(mContext)
                    .notifyTaskbarStatus(/* visible */ false, /* stashed */ false);
            return;
        }

        if (mTaskbarActivityContext == null) {
            mTaskbarActivityContext = new TaskbarActivityContext(mContext, dp, mNavButtonController,
                    mUnfoldProgressProvider);
        } else {
            mTaskbarActivityContext.updateDeviceProfile(dp, mNavMode);
        }
        mTaskbarActivityContext.init(mSharedState);

        if (mActivity != null) {
            mTaskbarActivityContext.setUIController(
                    createTaskbarUIControllerForActivity(mActivity));
        }
    }

    public void onSystemUiFlagsChanged(int systemUiStateFlags) {
        if (DEBUG) {
            Log.d(TAG, "SysUI flags changed: " + formatFlagChange(systemUiStateFlags,
                    mSharedState.sysuiStateFlags, QuickStepContract::getSystemUiStateString));
        }
        mSharedState.sysuiStateFlags = systemUiStateFlags;
        if (mTaskbarActivityContext != null) {
            mTaskbarActivityContext.updateSysuiStateFlags(systemUiStateFlags, false /* fromInit */);
        }
    }

    public void onLongPressHomeEnabled(boolean assistantLongPressEnabled) {
        if (mNavButtonController != null) {
            mNavButtonController.setAssistantLongPressEnabled(assistantLongPressEnabled);
        }
    }

    /**
     * Sets the flag indicating setup UI is visible
     */
    public void setSetupUIVisible(boolean isVisible) {
        mSharedState.setupUIVisible = isVisible;
        if (mTaskbarActivityContext != null) {
            mTaskbarActivityContext.setSetupUIVisible(isVisible);
        }
    }

    /**
     * @return {@code true} if provided device profile isn't a large screen profile
     *                      and we are using a single window for taskbar and navbar.
     */
    public static boolean isPhoneMode(DeviceProfile deviceProfile) {
        return TaskbarManager.FLAG_HIDE_NAVBAR_WINDOW && deviceProfile.isPhone;
    }

    /**
     * @return {@code true} if {@link #isPhoneMode(DeviceProfile)} is true and we're using
     *                      3 button-nav
     */
    public static boolean isPhoneButtonNavMode(TaskbarActivityContext context) {
        return isPhoneMode(context.getDeviceProfile()) && context.isThreeButtonNav();
    }

    private boolean isTaskbarPresent(DeviceProfile deviceProfile) {
        return FLAG_HIDE_NAVBAR_WINDOW || deviceProfile.isTaskbarPresent;
    }

    public void onRotationProposal(int rotation, boolean isValid) {
        if (mTaskbarActivityContext != null) {
            mTaskbarActivityContext.onRotationProposal(rotation, isValid);
        }
    }

    public void disableNavBarElements(int displayId, int state1, int state2, boolean animate) {
        mSharedState.disableNavBarDisplayId = displayId;
        mSharedState.disableNavBarState1 = state1;
        mSharedState.disableNavBarState2 = state2;
        if (mTaskbarActivityContext != null) {
            mTaskbarActivityContext.disableNavBarElements(displayId, state1, state2, animate);
        }
    }

    public void onSystemBarAttributesChanged(int displayId, int behavior) {
        mSharedState.systemBarAttrsDisplayId = displayId;
        mSharedState.systemBarAttrsBehavior = behavior;
        if (mTaskbarActivityContext != null) {
            mTaskbarActivityContext.onSystemBarAttributesChanged(displayId, behavior);
        }
    }

    public void onNavButtonsDarkIntensityChanged(float darkIntensity) {
        mSharedState.navButtonsDarkIntensity = darkIntensity;
        if (mTaskbarActivityContext != null) {
            mTaskbarActivityContext.onNavButtonsDarkIntensityChanged(darkIntensity);
        }
    }

    /**
     * Called when the manager is no longer needed
     */
    public void destroy() {
        debugWhyTaskbarNotDestroyed("TaskbarManager#destroy()");
        if (mActivity != null) {
            mActivity.removeOnDeviceProfileChangeListener(mDebugActivityDeviceProfileChanged);
        }

        UI_HELPER_EXECUTOR.execute(
                () -> mTaskbarBroadcastReceiver.unregisterReceiverSafely(mContext));
        destroyExistingTaskbar();
        mDisplayController.removeChangeListener(mDispInfoChangeListener);
        SettingsCache.INSTANCE.get(mContext).unregister(USER_SETUP_COMPLETE_URI,
                mUserSetupCompleteListener);
        SettingsCache.INSTANCE.get(mContext).unregister(NAV_BAR_KIDS_MODE,
                mNavBarKidsModeListener);
        mContext.unregisterComponentCallbacks(mComponentCallbacks);
        mContext.unregisterReceiver(mShutdownReceiver);
    }

    public @Nullable TaskbarActivityContext getCurrentActivityContext() {
        return mTaskbarActivityContext;
    }

    public void dumpLogs(String prefix, PrintWriter pw) {
        pw.println(prefix + "TaskbarManager:");
        if (mTaskbarActivityContext == null) {
            pw.println(prefix + "\tTaskbarActivityContext: null");
        } else {
            mTaskbarActivityContext.dumpLogs(prefix + "\t", pw);
        }
    }

    /** Temp logs for b/254119092. */
    public void debugWhyTaskbarNotDestroyed(String debugReason) {
        StringJoiner log = new StringJoiner("\n");
        log.add(debugReason);

        boolean activityTaskbarPresent = mActivity != null
                && mActivity.getDeviceProfile().isTaskbarPresent;
        boolean contextTaskbarPresent = mUserUnlocked
                && LauncherAppState.getIDP(mContext).getDeviceProfile(mContext).isTaskbarPresent;
        if (activityTaskbarPresent == contextTaskbarPresent) {
            log.add("mActivity and mContext agree taskbarIsPresent=" + contextTaskbarPresent);
            Log.d(TASKBAR_NOT_DESTROYED_TAG, log.toString());
            return;
        }

        log.add("mActivity and mContext device profiles have different values, add more logs.");

        log.add("\tmActivity logs:");
        log.add("\t\tmActivity=" + mActivity);
        if (mActivity != null) {
            log.add("\t\tmActivity.getResources().getConfiguration()="
                    + mActivity.getResources().getConfiguration());
            log.add("\t\tmActivity.getDeviceProfile().isTaskbarPresent="
                    + activityTaskbarPresent);
        }
        log.add("\tmContext logs:");
        log.add("\t\tmContext=" + mContext);
        log.add("\t\tmContext.getResources().getConfiguration()="
                + mContext.getResources().getConfiguration());
        if (mUserUnlocked) {
            log.add("\t\tLauncherAppState.getIDP().getDeviceProfile(mContext).isTaskbarPresent="
                    + contextTaskbarPresent);
        } else {
            log.add("\t\tCouldn't get DeviceProfile because !mUserUnlocked");
        }

        Log.d(TASKBAR_NOT_DESTROYED_TAG, log.toString());
    }

    private final DeviceProfile.OnDeviceProfileChangeListener mDebugActivityDeviceProfileChanged =
            dp -> debugWhyTaskbarNotDestroyed("mActivity onDeviceProfileChanged");
}