/*
 * 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;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.DialogInterface.OnDismissListener;
import android.content.Intent;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Bundle;
import android.os.PowerManager;
import android.provider.Settings;
import android.view.Window;
import android.view.WindowManager;

import net.micode.notes.R;
import net.micode.notes.data.Notes;
import net.micode.notes.tool.DataUtils;
import net.micode.notes.ui.NoteEditActivity;

import java.io.IOException;

/**
 * 闹钟提醒活动
 * 当笔记提醒时间到达时显示提醒界面
 */
/**
 * 闹钟提醒活动
 * 用于显示笔记提醒对话框并播放闹钟声音
 */
public class AlarmAlertActivity extends Activity implements OnClickListener, OnDismissListener {
    /**
     * 笔记ID
     */
    private long mNoteId;
    
    /**
     * 笔记摘要内容
     */
    private String mSnippet;
    
    /**
     * 摘要预览最大长度
     */
    private static final int SNIPPET_PREW_MAX_LEN = 60;
    
    /**
     * 媒体播放器，用于播放闹钟声音
     */
    MediaPlayer mPlayer;

    /**
     * 创建活动时调用的方法
     * 设置窗口特性、处理意图数据、初始化播放器并显示提醒对话框
     * @param savedInstanceState 保存的实例状态
     */
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);

        final Window win = getWindow();
        // 允许在锁屏时显示
        win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);

        if (!isScreenOn()) {
            // 如果屏幕关闭，添加标志唤醒屏幕并保持点亮
            win.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
                    | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
                    | WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON
                    | WindowManager.LayoutParams.FLAG_LAYOUT_INSET_DECOR);
        }

        Intent intent = getIntent();

        try {
            // 从Intent中获取笔记ID
            mNoteId = Long.valueOf(intent.getData().getPathSegments().get(1));
            // 获取笔记摘要
            mSnippet = DataUtils.getSnippetById(this.getContentResolver(), mNoteId);
            // 限制摘要长度
            mSnippet = mSnippet.length() > SNIPPET_PREW_MAX_LEN ? mSnippet.substring(0,
                    SNIPPET_PREW_MAX_LEN) + getResources().getString(R.string.notelist_string_info)
                    : mSnippet;
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
            return;
        }

        // 初始化媒体播放器
        mPlayer = new MediaPlayer();
        // 检查笔记是否可见，如果可见则显示对话框并播放声音
        if (DataUtils.visibleInNoteDatabase(getContentResolver(), mNoteId, Notes.TYPE_NOTE)) {
            showActionDialog();
            playAlarmSound();
        } else {
            finish();
        }
    }

    /**
     * 检查屏幕是否开启
     * @return 屏幕是否开启
     */
    private boolean isScreenOn() {
        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
        return pm.isScreenOn();
    }

    /**
     * 播放闹钟声音
     * 获取系统默认闹钟铃声并设置循环播放
     */
    private void playAlarmSound() {
        // 获取系统默认闹钟铃声URI
        Uri url = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_ALARM);

        // 获取静音模式下受影响的音频流
        int silentModeStreams = Settings.System.getInt(getContentResolver(),
                Settings.System.MODE_RINGER_STREAMS_AFFECTED, 0);

        // 设置音频流类型
        if ((silentModeStreams & (1 << AudioManager.STREAM_ALARM)) != 0) {
            mPlayer.setAudioStreamType(silentModeStreams);
        } else {
            mPlayer.setAudioStreamType(AudioManager.STREAM_ALARM);
        }
        try {
            mPlayer.setDataSource(this, url);
            mPlayer.prepare();
            mPlayer.setLooping(true);  // 设置循环播放
            mPlayer.start();
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (SecurityException e) {
            e.printStackTrace();
        } catch (IllegalStateException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 显示提醒对话框
     * 对话框显示笔记摘要，并根据屏幕状态提供不同的按钮选项
     */
    private void showActionDialog() {
        AlertDialog.Builder dialog = new AlertDialog.Builder(this);
        dialog.setTitle(R.string.app_name);
        dialog.setMessage(mSnippet);  // 显示笔记摘要
        dialog.setPositiveButton(R.string.notealert_ok, this);  // 确定按钮
        if (isScreenOn()) {
            // 如果屏幕已开启，显示"进入"按钮
            dialog.setNegativeButton(R.string.notealert_enter, this);
        }
        // 显示对话框并设置消失监听器
        dialog.show().setOnDismissListener(this);
    }

    /**
     * 处理对话框按钮点击事件
     * @param dialog 对话框实例
     * @param which 被点击的按钮ID
     */
    public void onClick(DialogInterface dialog, int which) {
        switch (which) {
            case DialogInterface.BUTTON_NEGATIVE:
                // 点击"进入"按钮，打开笔记编辑界面查看完整笔记
                Intent intent = new Intent(this, NoteEditActivity.class);
                intent.setAction(Intent.ACTION_VIEW);
                intent.putExtra(Intent.EXTRA_UID, mNoteId);
                startActivity(intent);
                break;
            default:
                // 点击"确定"按钮，不执行额外操作
                break;
        }
    }

    /**
     * 处理对话框消失事件
     * 停止闹钟声音并结束活动
     * @param dialog 对话框实例
     */
    public void onDismiss(DialogInterface dialog) {
        stopAlarmSound();  // 停止闹钟声音
        finish();          // 结束活动
    }

    /**
     * 停止闹钟声音
     * 释放媒体播放器资源
     */
    private void stopAlarmSound() {
        if (mPlayer != null) {
            mPlayer.stop();
            mPlayer.release();  // 释放资源
            mPlayer = null;      // 清空引用
        }
    }
}
