/*
 * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
 *
 * 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 net.micode.notes.gtask.remote;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;

import net.micode.notes.R;
import net.micode.notes.ui.NotesListActivity;
import net.micode.notes.ui.NotesPreferenceActivity;

/*异步操作类，实现GTask的异步操作过程
 * 主要方法：
 * private void showNotification(int tickerId, String content) 向用户提示当前同步的状态，是一个用于交互的方法
 * protected Integer doInBackground(Void... unused) 此方法在后台线程执行，完成任务的主要工作，通常需要较长的时间
 * protected void onProgressUpdate(String... progress)  可以使用进度条增加用户体验度。 此方法在主线程执行，用于显示任务执行的进度。
 * protected void onPostExecute(Integer result)  相当于Handler 处理UI的方式，在这里面可以使用在doInBackground 得到的结果处理操作UI
 */
public class GTaskASyncTask extends AsyncTask<Void, String, Integer> {
    private static int GTASK_SYNC_NOTIFICATION_ID = 5234235; // 通知ID

    // 同步完成回调接口
    public interface OnCompleteListener {
        void onComplete();
    }

    private Context mContext;                      // 上下文
    private NotificationManager mNotifiManager;    // 通知管理器
    private GTaskManager mTaskManager;            // GTask管理类
    private OnCompleteListener mOnCompleteListener; // 完成回调

    // 构造函数：初始化任务
    public GTaskASyncTask(Context context, OnCompleteListener listener) {
        mContext = context;
        mOnCompleteListener = listener;
        mNotifiManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        mTaskManager = GTaskManager.getInstance(); // 获取GTask管理单例
    }

    // 取消同步任务
    public void cancelSync() {
        mTaskManager.cancelSync();
    }

    // 发布进度（封装参数格式）
    public void publishProgess(String message) {
        publishProgress(new String[] { message });
    }

    // 显示同步通知
    private void showNotification(int tickerId, String content) {
        PendingIntent pendingIntent;
        // 根据通知类型设置点击跳转的页面
        if (tickerId != R.string.ticker_success) {
            pendingIntent = PendingIntent.getActivity(mContext, 0,
                    new Intent(mContext, NotesPreferenceActivity.class),
                    PendingIntent.FLAG_IMMUTABLE);
        } else {
            pendingIntent = PendingIntent.getActivity(mContext, 0,
                    new Intent(mContext, NotesListActivity.class),
                    PendingIntent.FLAG_IMMUTABLE);
        }
        // 构建通知
        Notification.Builder builder = new Notification.Builder(mContext)
                .setAutoCancel(true)                // 点击后自动取消
                .setContentTitle(mContext.getString(R.string.app_name))
                .setContentText(content)
                .setContentIntent(pendingIntent)     // 点击通知后的跳转意图
                .setWhen(System.currentTimeMillis())
                .setOngoing(true);                   // 显示为进行中状态
        mNotifiManager.notify(GTASK_SYNC_NOTIFICATION_ID, builder.getNotification());
    }

    // 后台执行同步任务（异步任务核心方法）
    @Override
    protected Integer doInBackground(Void... unused) {
        // 发布登录进度通知
        publishProgess(mContext.getString(R.string.sync_progress_login,
                NotesPreferenceActivity.getSyncAccountName(mContext)));
        // 调用GTaskManager执行同步，返回状态码
        return mTaskManager.sync(mContext, this);
    }

    // 更新进度（UI线程执行）
    @Override
    protected void onProgressUpdate(String... progress) {
        showNotification(R.string.ticker_syncing, progress[0]); // 显示同步中通知
        // 向服务发送广播（如果上下文是GTaskSyncService）
        if (mContext instanceof GTaskSyncService) {
            ((GTaskSyncService) mContext).sendBroadcast(progress[0]);
        }
    }

    // 任务完成后执行（UI线程执行）
    @Override
    protected void onPostExecute(Integer result) {
        // 根据同步结果显示不同通知
        if (result == GTaskManager.STATE_SUCCESS) {
            showNotification(R.string.ticker_success,
                    mContext.getString(R.string.success_sync_account, mTaskManager.getSyncAccount()));
            NotesPreferenceActivity.setLastSyncTime(mContext, System.currentTimeMillis()); // 记录最后同步时间
        } else if (result == GTaskManager.STATE_NETWORK_ERROR) {
            showNotification(R.string.ticker_fail, mContext.getString(R.string.error_sync_network));
        } else if (result == GTaskManager.STATE_INTERNAL_ERROR) {
            showNotification(R.string.ticker_fail, mContext.getString(R.string.error_sync_internal));
        } else if (result == GTaskManager.STATE_SYNC_CANCELLED) {
            showNotification(R.string.ticker_cancel, mContext.getString(R.string.error_sync_cancelled));
        }
        // 异步执行回调（避免阻塞UI线程）
        if (mOnCompleteListener != null) {
            new Thread(() -> mOnCompleteListener.onComplete()).start();
        }
    }
}