/*
 * 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.ui;

// 导入Android系统服务相关
import android.app.AlarmManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.ContentUris;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;

// 导入项目数据模型和常量
import net.micode.notes.data.Notes;
import net.micode.notes.data.Notes.NoteColumns;

/**
 * 闹钟初始化广播接收器 - 用于在系统启动或时间变更时重新设置所有未触发的便签提醒
 * 继承自BroadcastReceiver，监听系统广播事件
 */
public class AlarmInitReceiver extends BroadcastReceiver {

    // 数据库查询投影列（需要查询的字段）
    private static final String [] PROJECTION = new String [] {
            NoteColumns.ID,          // 便签ID列
            NoteColumns.ALERTED_DATE // 提醒时间列
    };

    // 列索引常量
    private static final int COLUMN_ID                = 0; // ID列的索引
    private static final int COLUMN_ALERTED_DATE      = 1; // 提醒时间列的索引

    @Override
    public void onReceive(Context context, Intent intent) {
        long currentDate = System.currentTimeMillis(); // 获取当前系统时间

        // 查询内容提供者获取需要设置提醒的便签
        Cursor c = context.getContentResolver().query(
                Notes.CONTENT_NOTE_URI,    // 便签内容URI
                PROJECTION,                // 需要查询的列
                NoteColumns.ALERTED_DATE + ">? AND " + NoteColumns.TYPE + "=" + Notes.TYPE_NOTE, // 筛选条件：提醒时间未过期且类型为普通便签
                new String[] { String.valueOf(currentDate) }, // 当前时间作为筛选参数
                null); // 排序方式（无）

        if (c != null) {
            if (c.moveToFirst()) { // 游标移动到第一条记录
                do {
                    long alertDate = c.getLong(COLUMN_ALERTED_DATE); // 获取提醒时间

                    // 创建发送给AlarmReceiver的Intent
                    Intent sender = new Intent(context, AlarmReceiver.class);
                    // 设置数据URI：Note内容URI + 当前便签ID
                    sender.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, c.getLong(COLUMN_ID)));

                    // 创建PendingIntent（延迟触发的广播）
                    PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, sender, 0);

                    // 获取系统闹钟服务
                    AlarmManager alarmManager = (AlarmManager) context
                            .getSystemService(Context.ALARM_SERVICE);
                    // 设置精确闹钟（RTC_WAKEUP会在指定时间唤醒设备）
                    alarmManager.set(AlarmManager.RTC_WAKEUP, alertDate, pendingIntent);
                } while (c.moveToNext()); // 循环处理下一条记录
            }
            c.close(); // 关闭游标释放资源
        }
    }
}