/*
 * 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 java.io.IOException;

/**
 * 闹钟提醒Activity类
 * 功能：当便签提醒时间到达时显示提醒对话框并播放闹铃
 */
public class AlarmAlertActivity extends Activity implements OnClickListener, OnDismissListener {
    private long mNoteId; // 当前提醒便签的ID
    private String mSnippet; // 便签内容摘要
    private static final int SNIPPET_PREW_MAX_LEN = 60; // 摘要预览最大长度
    MediaPlayer mPlayer; // 媒体播放器实例，用于播放闹铃

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // 设置无标题栏
        requestWindowFeature(Window.FEATURE_NO_TITLE);

        final Window win = getWindow();
        // 添加标志使界面在锁屏状态下也能显示
        win.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);

        // 如果屏幕未点亮，则添加相关标志保持屏幕唤醒
        if (!isScreenOn()) {
            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);
        }

        // 获取启动此Activity的Intent
        Intent intent = getIntent();

        try {
            // 从Intent URI中解析出便签ID
            mNoteId = Long.valueOf(intent.getData().getPathSegments().get(1));
            // 根据ID从数据库获取便签内容摘要
            mSnippet = DataUtils.getSnippetById(this.getContentResolver(), mNoteId);
            // 如果摘要过长则截断并添加省略提示
            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();
        // 检查便签是否仍然存在于数据库中
        if (DataUtils.visibleInNoteDatabase(getContentResolver(), mNoteId, Notes.TYPE_NOTE)) {
            showActionDialog(); // 显示提醒对话框
            playAlarmSound(); // 播放闹铃声音
        } else {
            finish(); // 如果便签已被删除则直接结束
        }
    }

    /**
     * 检查屏幕是否处于点亮状态
     * @return boolean 屏幕点亮状态
     */
    private boolean isScreenOn() {
        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
        return pm.isScreenOn();
    }

    /**
     * 播放闹铃声音方法
     */
    private void playAlarmSound() {
        // 获取系统默认闹铃铃声URI
        Uri url = RingtoneManager.getActualDefaultRingtoneUri(this, RingtoneManager.TYPE_ALARM);

        // 获取系统设置的受静音模式影响的音频流
        int silentModeStreams = Settings.System.getInt(getContentResolver(),
                Settings.System.MODE_RINGER_STREAMS_AFFECTED, 0);

        // 根据系统设置设置音频流类型
        if ((silentModeStreams & (1 << AudioManager.STREAM_ALARM)) != 0) {
            mPlayer.setAudioStreamType(silentModeStreams);
        } else {
            mPlayer.setAudioStreamType(AudioManager.STREAM_ALARM);
        }
        
        try {
            // 设置音频源并准备播放
            mPlayer.setDataSource(this, url);
            mPlayer.prepare();
            mPlayer.setLooping(true); // 设置循环播放
            mPlayer.start(); // 开始播放
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        } catch (SecurityException e) {
            e.printStackTrace();
        } catch (IllegalStateException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * 显示提醒操作对话框
     */
    private void showActionDialog() {
        // 创建AlertDialog构建器
        AlertDialog.Builder dialog = new AlertDialog.Builder(this);
        // 设置对话框标题和内容
        dialog.setTitle(R.string.app_name);
        dialog.setMessage(mSnippet);
        // 添加确定按钮
        dialog.setPositiveButton(R.string.notealert_ok, this);
        // 如果屏幕已点亮，则添加"进入"按钮
        if (isScreenOn()) {
            dialog.setNegativeButton(R.string.notealert_enter, this);
        }
        // 显示对话框并设置关闭监听
        dialog.show().setOnDismissListener(this);
    }

    /**
     * 对话框按钮点击事件处理
     * @param dialog 对话框实例
     * @param which 被点击的按钮标识
     */
    public void onClick(DialogInterface dialog, int which) {
        switch (which) {
            case DialogInterface.BUTTON_NEGATIVE:
                // 点击"进入"按钮时跳转到便签编辑界面
                Intent intent = new Intent(this, NoteEditActivity.class);
                intent.setAction(Intent.ACTION_VIEW);
                intent.putExtra(Intent.EXTRA_UID, mNoteId);
                startActivity(intent);
                break;
            default:
                break;
        }
    }

    /**
     * 对话框关闭事件处理
     * @param dialog 对话框实例
     */
    public void onDismiss(DialogInterface dialog) {
        stopAlarmSound(); // 停止闹铃声音
        finish(); // 结束当前Activity
    }

    /**
     * 停止闹铃声音方法
     */
    private void stopAlarmSound() {
        if (mPlayer != null) {
            mPlayer.stop(); // 停止播放
            mPlayer.release(); // 释放资源
            mPlayer = null; // 置空引用
        }
    }
}