/*
 * 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;

/**
 * GTaskASyncTask类 - 异步任务处理Google Tasks同步
 * 继承自AsyncTask，在后台执行同步操作，并处理进度更新和结果通知
 * 主要功能包括：
 * - 执行GTasks同步操作
 * - 显示同步进度通知
 * - 处理同步结果
 * - 提供取消同步功能
 */
public class GTaskASyncTask extends AsyncTask<Void, String, Integer> {

    private static int GTASK_SYNC_NOTIFICATION_ID = 5234235;// 通知ID常量

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

    private Context mContext;// 应用上下文

    private NotificationManager mNotifiManager;// 通知管理器

    private GTaskManager mTaskManager;// GTasks管理器

    private OnCompleteListener mOnCompleteListener;// 完成监听器

    /**
     * 构造函数
     * @param context 应用上下文
     * @param listener 同步完成监听器
     */
    public GTaskASyncTask(Context context, OnCompleteListener listener) {
        mContext = context;
        mOnCompleteListener = listener;
        mNotifiManager = (NotificationManager) mContext
                .getSystemService(Context.NOTIFICATION_SERVICE);
        mTaskManager = GTaskManager.getInstance();
    }

    /**
     * 取消同步操作
     */
    public void cancelSync() {
        mTaskManager.cancelSync();
    }

    /**
     * 发布同步进度更新
     * @param message 进度消息
     */
    public void publishProgess(String message) {
        publishProgress(new String[] {
            message
        });
    }

    /**
     * 显示同步状态通知
     * @param tickerId 通知标题资源ID
     * @param content 通知内容
     */
    private void showNotification(int tickerId, String content) {
        // 构建PendingIntent，根据同步结果决定跳转到不同Activity
        PendingIntent pendingIntent;
        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);
        }

        // Use modern notification builder (API 21+ support)
        Notification notification = new Notification.Builder(mContext)
                .setContentTitle(mContext.getString(R.string.app_name))
                .setContentText(content)
                .setContentIntent(pendingIntent)
                .setSmallIcon(R.drawable.notification)
                .setDefaults(Notification.DEFAULT_LIGHTS)
                .setAutoCancel(true)
                .build();

        mNotifiManager.notify(GTASK_SYNC_NOTIFICATION_ID, notification);
    }

    /**
     * 后台执行同步操作
     * @param unused 未使用的参数
     * @return 同步结果状态码
     */
    @Override
    protected Integer doInBackground(Void... unused) {
        // 发布登录进度并开始同步
        publishProgess(mContext.getString(R.string.sync_progress_login, NotesPreferenceActivity
                .getSyncAccountName(mContext)));
        return mTaskManager.sync(mContext, this);
    }

    /**
     * 处理进度更新
     * @param progress 进度消息数组
     */
    @Override
    protected void onProgressUpdate(String... progress) {
        showNotification(R.string.ticker_syncing, progress[0]);
        if (mContext instanceof GTaskSyncService) {
            ((GTaskSyncService) mContext).sendBroadcast(progress[0]);
        }
    }

    /**
     * 同步完成后处理
     * @param result 同步结果状态码
     */
    @Override
    protected void onPostExecute(Integer result) {
        // 根据不同的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());
        } 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));
        }
        // 在新线程中执行完成回调
        if (mOnCompleteListener != null) {
            new Thread(new Runnable() {

                public void run() {
                    mOnCompleteListener.onComplete();
                }
            }).start();
        }
    }
}