/*
 * Copyright (C) 2010, T-Mobile USA, Inc.
 * Copyright (C) 2015 The CyanogenMod 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.server;

import android.app.Notification;
import android.app.NotificationManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ThemeUtils;
import android.content.res.ThemeChangeRequest;
import android.content.res.ThemeChangeRequest.RequestType;
import android.content.res.ThemeConfig;
import android.content.res.ThemeManager;
import android.os.SystemClock;

import com.android.internal.R;

public class AppsFailureReceiver extends BroadcastReceiver {

    private static final int FAILURES_THRESHOLD = 3;
    private static final int EXPIRATION_TIME_IN_MILLISECONDS = 30000; // 30 seconds

    private static final int THEME_RESET_NOTIFICATION_ID = 0x4641494C;

    private int mFailuresCount = 0;
    private long mStartTime = 0;

    // This function implements the following logic.
    // If after a theme was applied the number of application launch failures
    // at any moment was equal to FAILURES_THRESHOLD
    // in less than EXPIRATION_TIME_IN_MILLISECONDS
    // the default theme is applied unconditionally.
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (action.equals(Intent.ACTION_APP_FAILURE)) {
            long currentTime = SystemClock.uptimeMillis();
            String pkgName = intent.getStringExtra("package");
            if (currentTime - mStartTime > EXPIRATION_TIME_IN_MILLISECONDS) {
                // reset both the count and the timer
                mStartTime = currentTime;
                mFailuresCount = 0;
            }
            if (mFailuresCount <= FAILURES_THRESHOLD) {
                mFailuresCount++;
                if (mFailuresCount == FAILURES_THRESHOLD) {
                    // let the theme manager take care of getting us back on the default theme
                    ThemeManager tm =
                            (ThemeManager) context.getSystemService(Context.THEME_SERVICE);
                    final String themePkgName = ThemeConfig.SYSTEM_DEFAULT;
                    ThemeChangeRequest.Builder builder = new ThemeChangeRequest.Builder();
                    builder.setOverlay(themePkgName)
                            .setStatusBar(themePkgName)
                            .setNavBar(themePkgName)
                            .setIcons(themePkgName)
                            .setFont(themePkgName)
                            .setBootanimation(themePkgName)
                            .setWallpaper(themePkgName)
                            .setLockWallpaper(themePkgName)
                            .setAlarm(themePkgName)
                            .setNotification(themePkgName)
                            .setRingtone(themePkgName)
                            .setRequestType(RequestType.THEME_RESET);
                    // Since we are resetting everything to the system theme, we can have the
                    // theme service remove all per app themes without setting them explicitly :)
                    tm.requestThemeChange(builder.build(), true);
                    postThemeResetNotification(context);
                }
            }
        } else if (action.equals(Intent.ACTION_APP_FAILURE_RESET)
                || action.equals(ThemeUtils.ACTION_THEME_CHANGED)) {
            mFailuresCount = 0;
            mStartTime = SystemClock.uptimeMillis();
        } else if (action.equals(Intent.ACTION_PACKAGE_ADDED) ||
                action.equals(Intent.ACTION_PACKAGE_REMOVED)) {
            mFailuresCount = 0;
            mStartTime = SystemClock.uptimeMillis();
        }
    }

    /**
     * Posts a notification to let the user know their theme was reset
     * @param context
     */
    private void postThemeResetNotification(Context context) {
        NotificationManager nm =
                (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        String title = context.getString(R.string.theme_reset_notification_title);
        String body = context.getString(R.string.theme_reset_notification_body);
        Notification notice = new Notification.Builder(context)
                .setAutoCancel(true)
                .setOngoing(false)
                .setContentTitle(title)
                .setContentText(body)
                .setStyle(new Notification.BigTextStyle().bigText(body))
                .setSmallIcon(android.R.drawable.stat_notify_error)
                .setWhen(System.currentTimeMillis())
                .setCategory(Notification.CATEGORY_SYSTEM)
                .setPriority(Notification.PRIORITY_MAX)
                .build();
        nm.notify(THEME_RESET_NOTIFICATION_ID, notice);
    }
}