/*
 * 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.AlarmManager;
import android.app.AlertDialog;
import android.app.PendingIntent;
import android.app.SearchManager;
import android.appwidget.AppWidgetManager;
import android.content.ContentUris;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Paint;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.TextUtils;
import android.text.format.DateUtils;
import android.text.style.BackgroundColorSpan;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.WindowManager;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import net.micode.notes.R;
import net.micode.notes.data.Notes;
import net.micode.notes.data.Notes.TextNote;
import net.micode.notes.model.WorkingNote;
import net.micode.notes.model.WorkingNote.NoteSettingChangedListener;
import net.micode.notes.tool.DataUtils;
import net.micode.notes.tool.ResourceParser;
import net.micode.notes.tool.ResourceParser.TextAppearanceResources;
import net.micode.notes.ui.DateTimePickerDialog.OnDateTimeSetListener;
import net.micode.notes.ui.NoteEditText.OnTextViewChangeListener;
import net.micode.notes.widget.NoteWidgetProvider_2x;
import net.micode.notes.widget.NoteWidgetProvider_4x;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


/**
 * NoteEditActivity - 便签编辑活动
 * <p>
 * 该类负责处理便签的创建、编辑、保存等核心功能，支持普通文本模式和 checklist 模式
 * 实现了背景色切换、字体大小调整、提醒设置、分享等功能
 * </p>
 * 
 * @author MiCode Open Source Community
 * @version 1.0
 */
public class NoteEditActivity extends Activity implements OnClickListener,
        NoteSettingChangedListener, OnTextViewChangeListener {
    /**
     * HeadViewHolder - 便签头部视图持有者
     * <p>
     * 用于缓存便签头部的UI组件，提高性能
     * </p>
     */
    private class HeadViewHolder {
        public TextView tvModified;      // 修改时间显示
        public ImageView ivAlertIcon;    // 提醒图标
        public TextView tvAlertDate;     // 提醒日期显示
        public ImageView ibSetBgColor;   // 设置背景色按钮
    }

    /**
     * 背景选择按钮映射 - 将UI按钮ID映射到颜色常量
     */
    private static final Map<Integer, Integer> sBgSelectorBtnsMap = new HashMap<Integer, Integer>();
    static {
        sBgSelectorBtnsMap.put(R.id.iv_bg_yellow, ResourceParser.YELLOW);
        sBgSelectorBtnsMap.put(R.id.iv_bg_red, ResourceParser.RED);
        sBgSelectorBtnsMap.put(R.id.iv_bg_blue, ResourceParser.BLUE);
        sBgSelectorBtnsMap.put(R.id.iv_bg_green, ResourceParser.GREEN);
        sBgSelectorBtnsMap.put(R.id.iv_bg_white, ResourceParser.WHITE);
    }

    /**
     * 背景选择状态映射 - 将颜色常量映射到选中状态图标ID
     */
    private static final Map<Integer, Integer> sBgSelectorSelectionMap = new HashMap<Integer, Integer>();
    static {
        sBgSelectorSelectionMap.put(ResourceParser.YELLOW, R.id.iv_bg_yellow_select);
        sBgSelectorSelectionMap.put(ResourceParser.RED, R.id.iv_bg_red_select);
        sBgSelectorSelectionMap.put(ResourceParser.BLUE, R.id.iv_bg_blue_select);
        sBgSelectorSelectionMap.put(ResourceParser.GREEN, R.id.iv_bg_green_select);
        sBgSelectorSelectionMap.put(ResourceParser.WHITE, R.id.iv_bg_white_select);
    }

    /**
     * 字体大小按钮映射 - 将UI按钮ID映射到字体大小常量
     */
    private static final Map<Integer, Integer> sFontSizeBtnsMap = new HashMap<Integer, Integer>();
    static {
        sFontSizeBtnsMap.put(R.id.ll_font_large, ResourceParser.TEXT_LARGE);
        sFontSizeBtnsMap.put(R.id.ll_font_small, ResourceParser.TEXT_SMALL);
        sFontSizeBtnsMap.put(R.id.ll_font_normal, ResourceParser.TEXT_MEDIUM);
        sFontSizeBtnsMap.put(R.id.ll_font_super, ResourceParser.TEXT_SUPER);
    }

    /**
     * 字体大小选择状态映射 - 将字体大小常量映射到选中状态图标ID
     */
    private static final Map<Integer, Integer> sFontSelectorSelectionMap = new HashMap<Integer, Integer>();
    static {
        sFontSelectorSelectionMap.put(ResourceParser.TEXT_LARGE, R.id.iv_large_select);
        sFontSelectorSelectionMap.put(ResourceParser.TEXT_SMALL, R.id.iv_small_select);
        sFontSelectorSelectionMap.put(ResourceParser.TEXT_MEDIUM, R.id.iv_medium_select);
        sFontSelectorSelectionMap.put(ResourceParser.TEXT_SUPER, R.id.iv_super_select);
    }

    private static final String TAG = "NoteEditActivity";  // 日志标签

    private HeadViewHolder mNoteHeaderHolder;       // 头部视图持有者
    private View mHeadViewPanel;                   // 头部视图面板
    private View mNoteBgColorSelector;             // 背景颜色选择器
    private View mFontSizeSelector;                // 字体大小选择器
    private EditText mNoteEditor;                  // 便签编辑器
    private View mNoteEditorPanel;                 // 编辑器面板
    private WorkingNote mWorkingNote;              // 当前工作便签
    private SharedPreferences mSharedPrefs;        // 共享偏好设置
    private int mFontSizeId;                       // 当前字体大小ID

    private static final String PREFERENCE_FONT_SIZE = "pref_font_size";  // 字体大小偏好键
    private static final int SHORTCUT_ICON_TITLE_MAX_LEN = 10;  // 快捷方式标题最大长度

    public static final String TAG_CHECKED = String.valueOf('\u221A');   // 已勾选标记
    public static final String TAG_UNCHECKED = String.valueOf('\u25A1'); // 未勾选标记

    private LinearLayout mEditTextList;            // 编辑列表（用于checklist模式）
    private String mUserQuery;                     // 用户查询（用于搜索高亮）
    private Pattern mPattern;                      // 搜索模式（用于搜索高亮）

    /**
     * 初始化活动 onCreate 方法
     * <p>
     * 当活动创建时调用，设置布局并初始化活动状态
     * </p>
     * 
     * @param savedInstanceState 保存的实例状态，用于恢复活动
     */
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.note_edit);

        // 如果没有保存的实例状态且初始化失败，则结束活动
        if (savedInstanceState == null && !initActivityState(getIntent())) {
            finish();
            return;
        }
        // 初始化资源
        initResources();
    }

    /**
     * 恢复活动状态 onRestoreInstanceState 方法
     * <p>
     * 当活动因内存不足被杀死后重新加载时，恢复之前的状态
     * </p>
     * 
     * @param savedInstanceState 保存的实例状态
     */
    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        // 如果保存了实例状态且包含UID，则恢复活动
        if (savedInstanceState != null && savedInstanceState.containsKey(Intent.EXTRA_UID)) {
            Intent intent = new Intent(Intent.ACTION_VIEW);
            intent.putExtra(Intent.EXTRA_UID, savedInstanceState.getLong(Intent.EXTRA_UID));
            if (!initActivityState(intent)) {
                finish();
                return;
            }
            Log.d(TAG, "Restoring from killed activity");
        }
    }

    /**
     * 初始化活动状态
     * <p>
     * 根据传入的意图初始化便签编辑活动，处理查看、创建、编辑便签的情况
     * </p>
     * 
     * @param intent 传入的意图，包含操作类型和数据
     * @return 初始化是否成功
     */
    private boolean initActivityState(Intent intent) {
        mWorkingNote = null;
        
        // 处理查看便签操作
        if (TextUtils.equals(Intent.ACTION_VIEW, intent.getAction())) {
            long noteId = intent.getLongExtra(Intent.EXTRA_UID, 0);
            mUserQuery = "";

            // 从搜索结果启动
            if (intent.hasExtra(SearchManager.EXTRA_DATA_KEY)) {
                noteId = Long.parseLong(intent.getStringExtra(SearchManager.EXTRA_DATA_KEY));
                mUserQuery = intent.getStringExtra(SearchManager.USER_QUERY);
            }

            // 检查便签是否存在
            if (!DataUtils.visibleInNoteDatabase(getContentResolver(), noteId, Notes.TYPE_NOTE)) {
                Intent jump = new Intent(this, NotesListActivity.class);
                startActivity(jump);
                showToast(R.string.error_note_not_exist);
                finish();
                return false;
            } else {
                // 加载便签
                mWorkingNote = WorkingNote.load(this, noteId);
                if (mWorkingNote == null) {
                    Log.e(TAG, "load note failed with note id" + noteId);
                    finish();
                    return false;
                }
            }
            // 设置软键盘模式为隐藏状态
            getWindow().setSoftInputMode(
                    WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN
                            | WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
        }
        // 处理创建或编辑便签操作
        else if(TextUtils.equals(Intent.ACTION_INSERT_OR_EDIT, intent.getAction())) {
            // 获取参数
            long folderId = intent.getLongExtra(Notes.INTENT_EXTRA_FOLDER_ID, 0);
            int widgetId = intent.getIntExtra(Notes.INTENT_EXTRA_WIDGET_ID,
                    AppWidgetManager.INVALID_APPWIDGET_ID);
            int widgetType = intent.getIntExtra(Notes.INTENT_EXTRA_WIDGET_TYPE,
                    Notes.TYPE_WIDGET_INVALIDE);
            int bgResId = intent.getIntExtra(Notes.INTENT_EXTRA_BACKGROUND_ID,
                    ResourceParser.getDefaultBgId(this));

            // 处理通话记录便签
            String phoneNumber = intent.getStringExtra(Intent.EXTRA_PHONE_NUMBER);
            long callDate = intent.getLongExtra(Notes.INTENT_EXTRA_CALL_DATE, 0);
            if (callDate != 0 && phoneNumber != null) {
                if (TextUtils.isEmpty(phoneNumber)) {
                    Log.w(TAG, "The call record number is null");
                }
                long noteId = 0;
                // 检查是否已存在相同的通话记录便签
                if ((noteId = DataUtils.getNoteIdByPhoneNumberAndCallDate(getContentResolver(),
                        phoneNumber, callDate)) > 0) {
                    mWorkingNote = WorkingNote.load(this, noteId);
                    if (mWorkingNote == null) {
                        Log.e(TAG, "load call note failed with note id" + noteId);
                        finish();
                        return false;
                    }
                } else {
                    // 创建新的通话记录便签
                    mWorkingNote = WorkingNote.createEmptyNote(this, folderId, widgetId,
                            widgetType, bgResId);
                    mWorkingNote.convertToCallNote(phoneNumber, callDate);
                }
            } else {
                // 创建普通新便签
                mWorkingNote = WorkingNote.createEmptyNote(this, folderId, widgetId, widgetType,
                        bgResId);
            }

            // 设置软键盘模式为可见状态
            getWindow().setSoftInputMode(
                    WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE
                            | WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);
        }
        // 不支持的操作类型
        else {
            Log.e(TAG, "Intent not specified action, should not support");
            finish();
            return false;
        }
        
        // 设置设置状态变化监听器
        mWorkingNote.setOnSettingStatusChangedListener(this);
        return true;
    }

    /**
     * 活动恢复 onResume 方法
     * <p>
     * 当活动恢复到前台时调用，初始化便签屏幕
     * </p>
     */
    @Override
    protected void onResume() {
        super.onResume();
        initNoteScreen();
    }

    /**
     * 初始化便签屏幕
     * <p>
     * 根据当前便签状态初始化UI，包括字体大小、背景颜色、内容显示等
     * </p>
     */
    private void initNoteScreen() {
        // 设置编辑器字体大小
        mNoteEditor.setTextAppearance(this, TextAppearanceResources
                .getTexAppearanceResource(mFontSizeId));
        
        // 根据便签模式显示内容
        if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) {
            // 切换到列表模式
            switchToListMode(mWorkingNote.getContent());
        } else {
            // 普通文本模式，显示高亮搜索结果
            mNoteEditor.setText(getHighlightQueryResult(mWorkingNote.getContent(), mUserQuery));
            // 将光标定位到文本末尾
            mNoteEditor.setSelection(mNoteEditor.getText().length());
        }
        
        // 隐藏所有背景选择状态
        for (Integer id : sBgSelectorSelectionMap.keySet()) {
            findViewById(sBgSelectorSelectionMap.get(id)).setVisibility(View.GONE);
        }
        
        // 设置头部和编辑器背景
        mHeadViewPanel.setBackgroundResource(mWorkingNote.getTitleBgResId());
        mNoteEditorPanel.setBackgroundResource(mWorkingNote.getBgColorResId());

        // 设置修改时间
        mNoteHeaderHolder.tvModified.setText(DateUtils.formatDateTime(this,
                mWorkingNote.getModifiedDate(), DateUtils.FORMAT_SHOW_DATE
                        | DateUtils.FORMAT_NUMERIC_DATE | DateUtils.FORMAT_SHOW_TIME
                        | DateUtils.FORMAT_SHOW_YEAR));

        // 显示提醒头部
        showAlertHeader();
    }

    /**
     * 显示提醒头部
     * <p>
     * 根据便签是否有提醒以及提醒是否过期，显示相应的提醒信息
     * </p>
     */
    private void showAlertHeader() {
        if (mWorkingNote.hasClockAlert()) {
            long time = System.currentTimeMillis();
            if (time > mWorkingNote.getAlertDate()) {
                // 提醒已过期
                mNoteHeaderHolder.tvAlertDate.setText(R.string.note_alert_expired);
            } else {
                // 显示相对时间
                mNoteHeaderHolder.tvAlertDate.setText(DateUtils.getRelativeTimeSpanString(
                        mWorkingNote.getAlertDate(), time, DateUtils.MINUTE_IN_MILLIS));
            }
            // 显示提醒图标和日期
            mNoteHeaderHolder.tvAlertDate.setVisibility(View.VISIBLE);
            mNoteHeaderHolder.ivAlertIcon.setVisibility(View.VISIBLE);
        } else {
            // 隐藏提醒图标和日期
            mNoteHeaderHolder.tvAlertDate.setVisibility(View.GONE);
            mNoteHeaderHolder.ivAlertIcon.setVisibility(View.GONE);
        };
    }

    /**
     * 处理新意图 onNewIntent 方法
     * <p>
     * 当活动已经存在且收到新意图时调用，重新初始化活动状态
     * </p>
     * 
     * @param intent 新的意图
     */
    @Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);
        initActivityState(intent);
    }

    /**
     * 保存实例状态 onSaveInstanceState 方法
     * <p>
     * 当活动即将被销毁时调用，保存当前便签状态
     * </p>
     * 
     * @param outState 用于保存状态的Bundle对象
     */
    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        
        // 对于新便签，先保存生成ID
        if (!mWorkingNote.existInDatabase()) {
            saveNote();
        }
        
        // 保存便签ID
        outState.putLong(Intent.EXTRA_UID, mWorkingNote.getNoteId());
        Log.d(TAG, "Save working note id: " + mWorkingNote.getNoteId() + " onSaveInstanceState");
    }

    /**
     * 分发触摸事件
     * <p>
     * 处理屏幕触摸事件，点击外部区域关闭背景选择器和字体大小选择器
     * </p>
     * 
     * @param ev 触摸事件对象
     * @return 是否消耗了该事件
     */
    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        // 点击背景选择器外部，关闭背景选择器
        if (mNoteBgColorSelector.getVisibility() == View.VISIBLE
                && !inRangeOfView(mNoteBgColorSelector, ev)) {
            mNoteBgColorSelector.setVisibility(View.GONE);
            return true;
        }

        // 点击字体大小选择器外部，关闭字体大小选择器
        if (mFontSizeSelector.getVisibility() == View.VISIBLE
                && !inRangeOfView(mFontSizeSelector, ev)) {
            mFontSizeSelector.setVisibility(View.GONE);
            return true;
        }
        
        // 其他情况交给父类处理
        return super.dispatchTouchEvent(ev);
    }

    /**
     * 检查触摸事件是否在指定视图范围内
     * 
     * @param view 要检查的视图
     * @param ev 触摸事件对象
     * @return 是否在视图范围内
     */
    private boolean inRangeOfView(View view, MotionEvent ev) {
        int []location = new int[2];
        view.getLocationOnScreen(location);
        int x = location[0];
        int y = location[1];
        
        // 检查触摸坐标是否在视图范围内
        if (ev.getX() < x
                || ev.getX() > (x + view.getWidth())
                || ev.getY() < y
                || ev.getY() > (y + view.getHeight())) {
                    return false;
                }
        return true;
    }

    /**
     * 初始化资源
     * <p>
     * 初始化UI组件，设置点击事件监听器
     * </p>
     */
    private void initResources() {
        // 初始化头部视图
        mHeadViewPanel = findViewById(R.id.note_title);
        mNoteHeaderHolder = new HeadViewHolder();
        mNoteHeaderHolder.tvModified = (TextView) findViewById(R.id.tv_modified_date);
        mNoteHeaderHolder.ivAlertIcon = (ImageView) findViewById(R.id.iv_alert_icon);
        mNoteHeaderHolder.tvAlertDate = (TextView) findViewById(R.id.tv_alert_date);
        mNoteHeaderHolder.ibSetBgColor = (ImageView) findViewById(R.id.btn_set_bg_color);
        mNoteHeaderHolder.ibSetBgColor.setOnClickListener(this);
        
        // 初始化编辑器
        mNoteEditor = (EditText) findViewById(R.id.note_edit_view);
        mNoteEditorPanel = findViewById(R.id.sv_note_edit);
        
        // 初始化背景颜色选择器
        mNoteBgColorSelector = findViewById(R.id.note_bg_color_selector);
        for (int id : sBgSelectorBtnsMap.keySet()) {
            ImageView iv = (ImageView) findViewById(id);
            iv.setOnClickListener(this);
        }

        // 初始化字体大小选择器
        mFontSizeSelector = findViewById(R.id.font_size_selector);
        for (int id : sFontSizeBtnsMap.keySet()) {
            View view = findViewById(id);
            view.setOnClickListener(this);
        };
        
        // 初始化共享偏好设置和字体大小
        mSharedPrefs = PreferenceManager.getDefaultSharedPreferences(this);
        mFontSizeId = mSharedPrefs.getInt(PREFERENCE_FONT_SIZE, ResourceParser.BG_DEFAULT_FONT_SIZE);
        
        // 修复字体大小ID可能超出范围的问题
        if(mFontSizeId >= TextAppearanceResources.getResourcesSize()) {
            mFontSizeId = ResourceParser.BG_DEFAULT_FONT_SIZE;
        }
        
        // 初始化编辑列表
        mEditTextList = (LinearLayout) findViewById(R.id.note_edit_list);
    }

    /**
     * 活动暂停 onPause 方法
     * <p>
     * 当活动进入后台时调用，保存便签并清除设置状态
     * </p>
     */
    @Override
    protected void onPause() {
        super.onPause();
        if(saveNote()) {
            Log.d(TAG, "Note data was saved with length:" + mWorkingNote.getContent().length());
        }
        clearSettingState();
    }

    /**
     * 更新小部件
     * <p>
     * 当便签更新时，更新对应的桌面小部件
     * </p>
     */
    private void updateWidget() {
        Intent intent = new Intent(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
        if (mWorkingNote.getWidgetType() == Notes.TYPE_WIDGET_2X) {
            intent.setClass(this, NoteWidgetProvider_2x.class);
        } else if (mWorkingNote.getWidgetType() == Notes.TYPE_WIDGET_4X) {
            intent.setClass(this, NoteWidgetProvider_4x.class);
        } else {
            Log.e(TAG, "Unspported widget type");
            return;
        }

        intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, new int[] {
            mWorkingNote.getWidgetId()
        });

        sendBroadcast(intent);
        setResult(RESULT_OK, intent);
    }

    /**
     * 点击事件处理
     * <p>
     * 处理UI组件的点击事件，包括设置背景色、选择背景色、选择字体大小
     * </p>
     * 
     * @param v 被点击的视图
     */
    public void onClick(View v) {
        int id = v.getId();
        if (id == R.id.btn_set_bg_color) {
            mNoteBgColorSelector.setVisibility(View.VISIBLE);
            findViewById(sBgSelectorSelectionMap.get(mWorkingNote.getBgColorId())).setVisibility(
                    -                    View.VISIBLE);
        } else if (sBgSelectorBtnsMap.containsKey(id)) {
            findViewById(sBgSelectorSelectionMap.get(mWorkingNote.getBgColorId())).setVisibility(
                    View.GONE);
            mWorkingNote.setBgColorId(sBgSelectorBtnsMap.get(id));
            mNoteBgColorSelector.setVisibility(View.GONE);
        } else if (sFontSizeBtnsMap.containsKey(id)) {
            findViewById(sFontSelectorSelectionMap.get(mFontSizeId)).setVisibility(View.GONE);
            mFontSizeId = sFontSizeBtnsMap.get(id);
            mSharedPrefs.edit().putInt(PREFERENCE_FONT_SIZE, mFontSizeId).commit();
            findViewById(sFontSelectorSelectionMap.get(mFontSizeId)).setVisibility(View.VISIBLE);
            if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) {
                getWorkingText();
                switchToListMode(mWorkingNote.getContent());
            } else {
                mNoteEditor.setTextAppearance(this,
                        TextAppearanceResources.getTexAppearanceResource(mFontSizeId));
            }
            mFontSizeSelector.setVisibility(View.GONE);
        }
    }

    /**
     * 返回键处理 onBackPressed 方法
     * <p>
     * 当用户点击返回键时调用，先尝试清除设置状态，否则保存便签并返回
     * </p>
     */
    @Override
    public void onBackPressed() {
        if(clearSettingState()) {
            return;
        }

        saveNote();
        super.onBackPressed();
    }

    /**
     * 清除设置状态
     * <p>
     * 关闭背景选择器和字体大小选择器
     * </p>
     * 
     * @return 是否清除了设置状态
     */
    private boolean clearSettingState() {
        if (mNoteBgColorSelector.getVisibility() == View.VISIBLE) {
            mNoteBgColorSelector.setVisibility(View.GONE);
            return true;
        } else if (mFontSizeSelector.getVisibility() == View.VISIBLE) {
            mFontSizeSelector.setVisibility(View.GONE);
            return true;
        }
        return false;
    }

    /**
     * 背景颜色变化监听器
     * <p>
     * 当背景颜色变化时调用，更新UI显示
     * </p>
     */
    public void onBackgroundColorChanged() {
        findViewById(sBgSelectorSelectionMap.get(mWorkingNote.getBgColorId())).setVisibility(
                View.VISIBLE);
        mNoteEditorPanel.setBackgroundResource(mWorkingNote.getBgColorResId());
        mHeadViewPanel.setBackgroundResource(mWorkingNote.getTitleBgResId());
    }

    /**
     * 准备选项菜单
     * <p>
     * 在显示菜单前调用，根据当前便签状态调整菜单项
     * </p>
     * 
     * @param menu 菜单对象
     * @return 是否显示菜单
     */
    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        if (isFinishing()) {
            return true;
        }
        
        // 清除设置状态
        clearSettingState();
        
        // 根据便签类型加载不同菜单
        menu.clear();
        if (mWorkingNote.getFolderId() == Notes.ID_CALL_RECORD_FOLDER) {
            getMenuInflater().inflate(R.menu.call_note_edit, menu);
        } else {
            getMenuInflater().inflate(R.menu.note_edit, menu);
        }
        
        // 根据便签模式调整列表模式菜单项标题
        if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) {
            menu.findItem(R.id.menu_list_mode).setTitle(R.string.menu_normal_mode);
        } else {
            menu.findItem(R.id.menu_list_mode).setTitle(R.string.menu_list_mode);
        }
        
        // 根据是否有提醒调整提醒相关菜单项可见性
        if (mWorkingNote.hasClockAlert()) {
            menu.findItem(R.id.menu_alert).setVisible(false);
        } else {
            menu.findItem(R.id.menu_delete_remind).setVisible(false);
        }
        return true;
    }

    /**
     * 选项菜单点击处理
     * <p>
     * 处理菜单选项的点击事件，包括新建便签、删除、字体大小、列表模式、分享等
     * </p>
     * 
     * @param item 被点击的菜单项
     * @return 是否处理了该事件
     */
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.menu_new_note:
                createNewNote();
                break;
            case R.id.menu_delete:
                // 显示删除确认对话框
                AlertDialog.Builder builder = new AlertDialog.Builder(this);
                builder.setTitle(getString(R.string.alert_title_delete));
                builder.setIcon(android.R.drawable.ic_dialog_alert);
                builder.setMessage(getString(R.string.alert_message_delete_note));
                builder.setPositiveButton(android.R.string.ok,
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int which) {
                                deleteCurrentNote();
                                finish();
                            }
                        });
                builder.setNegativeButton(android.R.string.cancel, null);
                builder.show();
                break;
            case R.id.menu_font_size:
                // 显示字体大小选择器
                mFontSizeSelector.setVisibility(View.VISIBLE);
                findViewById(sFontSelectorSelectionMap.get(mFontSizeId)).setVisibility(View.VISIBLE);
                break;
            case R.id.menu_list_mode:
                // 切换便签模式
                mWorkingNote.setCheckListMode(mWorkingNote.getCheckListMode() == 0 ?
                        TextNote.MODE_CHECK_LIST : 0);
                break;
            case R.id.menu_share:
                // 分享便签
                getWorkingText();
                sendTo(this, mWorkingNote.getContent());
                break;
            case R.id.menu_send_to_desktop:
                // 发送到桌面
                sendToDesktop();
                break;
            case R.id.menu_alert:
                // 设置提醒
                setReminder();
                break;
            case R.id.menu_delete_remind:
                // 删除提醒
                mWorkingNote.setAlertDate(0, false);
                break;
            default:
                break;
        }
        return true;
    }

    /**
     * 设置提醒
     * <p>
     * 显示日期时间选择对话框，设置便签提醒
     * </p>
     */
    private void setReminder() {
        DateTimePickerDialog d = new DateTimePickerDialog(this, System.currentTimeMillis());
        d.setOnDateTimeSetListener(new OnDateTimeSetListener() {
            public void OnDateTimeSet(AlertDialog dialog, long date) {
                mWorkingNote.setAlertDate(date	, true);
            }
        });
        d.show();
    }

    /**
     * 分享便签
     * <p>
     * 将便签内容分享给支持ACTION_SEND和text/plain类型的应用
     * </p>
     * 
     * @param context 上下文对象
     * @param info 要分享的内容
     */
    private void sendTo(Context context, String info) {
        Intent intent = new Intent(Intent.ACTION_SEND);
        intent.putExtra(Intent.EXTRA_TEXT, info);
        intent.setType("text/plain");
        context.startActivity(intent);
    }

    /**
     * 创建新便签
     * <p>
     * 保存当前便签，然后启动新的编辑活动
     * </p>
     */
    private void createNewNote() {
        // 首先保存当前编辑的便签
        saveNote();

        // 安全起见，启动新的NoteEditActivity
        finish();
        Intent intent = new Intent(this, NoteEditActivity.class);
        intent.setAction(Intent.ACTION_INSERT_OR_EDIT);
        intent.putExtra(Notes.INTENT_EXTRA_FOLDER_ID, mWorkingNote.getFolderId());
        startActivity(intent);
    }

    /**
     * 删除当前便签
     * <p>
     * 根据是否同步模式，直接删除或移到回收站
     * </p>
     */
    private void deleteCurrentNote() {
        if (mWorkingNote.existInDatabase()) {
            HashSet<Long> ids = new HashSet<Long>();
            long id = mWorkingNote.getNoteId();
            if (id != Notes.ID_ROOT_FOLDER) {
                ids.add(id);
            } else {
                Log.d(TAG, "Wrong note id, should not happen");
            }
            
            // 根据同步模式处理删除
            if (!isSyncMode()) {
                // 非同步模式，直接删除
                if (!DataUtils.batchDeleteNotes(getContentResolver(), ids)) {
                    Log.e(TAG, "Delete Note error");
                }
            } else {
                // 同步模式，移到回收站
                if (!DataUtils.batchMoveToFolder(getContentResolver(), ids, Notes.ID_TRASH_FOLER)) {
                    Log.e(TAG, "Move notes to trash folder error, should not happens");
                }
            }
        }
        
        // 标记为已删除
        mWorkingNote.markDeleted(true);
    }

    /**
     * 检查是否为同步模式
     * <p>
     * 判断当前是否已配置同步账号
     * </p>
     * 
     * @return 是否为同步模式
     */
    private boolean isSyncMode() {
        return NotesPreferenceActivity.getSyncAccountName(this).trim().length() > 0;
    }

    /**
     * 提醒时间变化监听器
     * <p>
     * 当提醒时间变化时调用，设置或取消系统闹钟
     * </p>
     * 
     * @param date 提醒日期时间
     * @param set 是否设置提醒
     */
    public void onClockAlertChanged(long date, boolean set) {
        // 先保存便签，确保有Note ID
        if (!mWorkingNote.existInDatabase()) {
            saveNote();
        }
        
        if (mWorkingNote.getNoteId() > 0) {
            // 创建闹钟意图
            Intent intent = new Intent(this, AlarmReceiver.class);
            intent.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, mWorkingNote.getNoteId()));
            PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0);
            AlarmManager alarmManager = ((AlarmManager) getSystemService(ALARM_SERVICE));
            
            // 更新提醒头部
            showAlertHeader();
            
            // 设置或取消闹钟
            if(!set) {
                alarmManager.cancel(pendingIntent);
            } else {
                alarmManager.set(AlarmManager.RTC_WAKEUP, date, pendingIntent);
            }
        } else {
            // 便签为空，无法设置提醒
            Log.e(TAG, "Clock alert setting error");
            showToast(R.string.error_note_empty_for_clock);
        }
    }

    /**
     * 小部件变化监听器
     * <p>
     * 当便签关联的小部件变化时调用，更新小部件
     * </p>
     */
    public void onWidgetChanged() {
        updateWidget();
    }

    public void onEditTextDelete(int index, String text) {
        int childCount = mEditTextList.getChildCount();
        if (childCount == 1) {
            return;
        }

        for (int i = index + 1; i < childCount; i++) {
            ((NoteEditText) mEditTextList.getChildAt(i).findViewById(R.id.et_edit_text))
                    .setIndex(i - 1);
        }

        mEditTextList.removeViewAt(index);
        NoteEditText edit = null;
        if(index == 0) {
            edit = (NoteEditText) mEditTextList.getChildAt(0).findViewById(
                    R.id.et_edit_text);
        } else {
            edit = (NoteEditText) mEditTextList.getChildAt(index - 1).findViewById(
                    R.id.et_edit_text);
        }
        int length = edit.length();
        edit.append(text);
        edit.requestFocus();
        edit.setSelection(length);
    }

    public void onEditTextEnter(int index, String text) {
        /**
         * Should not happen, check for debug
         */
        if(index > mEditTextList.getChildCount()) {
            Log.e(TAG, "Index out of mEditTextList boundrary, should not happen");
        }

        View view = getListItem(text, index);
        mEditTextList.addView(view, index);
        NoteEditText edit = (NoteEditText) view.findViewById(R.id.et_edit_text);
        edit.requestFocus();
        edit.setSelection(0);
        for (int i = index + 1; i < mEditTextList.getChildCount(); i++) {
            ((NoteEditText) mEditTextList.getChildAt(i).findViewById(R.id.et_edit_text))
                    .setIndex(i);
        }
    }

    private void switchToListMode(String text) {
        mEditTextList.removeAllViews();
        String[] items = text.split("\n");
        int index = 0;
        for (String item : items) {
            if(!TextUtils.isEmpty(item)) {
                mEditTextList.addView(getListItem(item, index));
                index++;
            }
        }
        mEditTextList.addView(getListItem("", index));
        mEditTextList.getChildAt(index).findViewById(R.id.et_edit_text).requestFocus();

        mNoteEditor.setVisibility(View.GONE);
        mEditTextList.setVisibility(View.VISIBLE);
    }

    private Spannable getHighlightQueryResult(String fullText, String userQuery) {
        SpannableString spannable = new SpannableString(fullText == null ? "" : fullText);
        if (!TextUtils.isEmpty(userQuery)) {
            mPattern = Pattern.compile(userQuery);
            Matcher m = mPattern.matcher(fullText);
            int start = 0;
            while (m.find(start)) {
                spannable.setSpan(
                        new BackgroundColorSpan(this.getResources().getColor(
                                R.color.user_query_highlight)), m.start(), m.end(),
                        Spannable.SPAN_INCLUSIVE_EXCLUSIVE);
                start = m.end();
            }
        }
        return spannable;
    }

    private View getListItem(String item, int index) {
        View view = LayoutInflater.from(this).inflate(R.layout.note_edit_list_item, null);
        final NoteEditText edit = (NoteEditText) view.findViewById(R.id.et_edit_text);
        edit.setTextAppearance(this, TextAppearanceResources.getTexAppearanceResource(mFontSizeId));
        CheckBox cb = ((CheckBox) view.findViewById(R.id.cb_edit_item));
        cb.setOnCheckedChangeListener(new OnCheckedChangeListener() {
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if (isChecked) {
                    edit.setPaintFlags(edit.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
                } else {
                    edit.setPaintFlags(Paint.ANTI_ALIAS_FLAG | Paint.DEV_KERN_TEXT_FLAG);
                }
            }
        });

        if (item.startsWith(TAG_CHECKED)) {
            cb.setChecked(true);
            edit.setPaintFlags(edit.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
            item = item.substring(TAG_CHECKED.length(), item.length()).trim();
        } else if (item.startsWith(TAG_UNCHECKED)) {
            cb.setChecked(false);
            edit.setPaintFlags(Paint.ANTI_ALIAS_FLAG | Paint.DEV_KERN_TEXT_FLAG);
            item = item.substring(TAG_UNCHECKED.length(), item.length()).trim();
        }

        edit.setOnTextViewChangeListener(this);
        edit.setIndex(index);
        edit.setText(getHighlightQueryResult(item, mUserQuery));
        return view;
    }

    public void onTextChange(int index, boolean hasText) {
        if (index >= mEditTextList.getChildCount()) {
            Log.e(TAG, "Wrong index, should not happen");
            return;
        }
        if(hasText) {
            mEditTextList.getChildAt(index).findViewById(R.id.cb_edit_item).setVisibility(View.VISIBLE);
        } else {
            mEditTextList.getChildAt(index).findViewById(R.id.cb_edit_item).setVisibility(View.GONE);
        }
    }

    public void onCheckListModeChanged(int oldMode, int newMode) {
        if (newMode == TextNote.MODE_CHECK_LIST) {
            switchToListMode(mNoteEditor.getText().toString());
        } else {
            if (!getWorkingText()) {
                mWorkingNote.setWorkingText(mWorkingNote.getContent().replace(TAG_UNCHECKED + " ",
                        ""));
            }
            mNoteEditor.setText(getHighlightQueryResult(mWorkingNote.getContent(), mUserQuery));
            mEditTextList.setVisibility(View.GONE);
            mNoteEditor.setVisibility(View.VISIBLE);
        }
    }

    private boolean getWorkingText() {
        boolean hasChecked = false;
        if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) {
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < mEditTextList.getChildCount(); i++) {
                View view = mEditTextList.getChildAt(i);
                NoteEditText edit = (NoteEditText) view.findViewById(R.id.et_edit_text);
                if (!TextUtils.isEmpty(edit.getText())) {
                    if (((CheckBox) view.findViewById(R.id.cb_edit_item)).isChecked()) {
                        sb.append(TAG_CHECKED).append(" ").append(edit.getText()).append("\n");
                        hasChecked = true;
                    } else {
                        sb.append(TAG_UNCHECKED).append(" ").append(edit.getText()).append("\n");
                    }
                }
            }
            mWorkingNote.setWorkingText(sb.toString());
        } else {
            mWorkingNote.setWorkingText(mNoteEditor.getText().toString());
        }
        return hasChecked;
    }

    private boolean saveNote() {
        getWorkingText();
        boolean saved = mWorkingNote.saveNote();
        if (saved) {
            /**
             * There are two modes from List view to edit view, open one note,
             * create/edit a node. Opening node requires to the original
             * position in the list when back from edit view, while creating a
             * new node requires to the top of the list. This code
             * {@link #RESULT_OK} is used to identify the create/edit state
             */
            setResult(RESULT_OK);
        }
        return saved;
    }

    private void sendToDesktop() {
        /**
         * Before send message to home, we should make sure that current
         * editing note is exists in databases. So, for new note, firstly
         * save it
         */
        if (!mWorkingNote.existInDatabase()) {
            saveNote();
        }

        if (mWorkingNote.getNoteId() > 0) {
            Intent sender = new Intent();
            Intent shortcutIntent = new Intent(this, NoteEditActivity.class);
            shortcutIntent.setAction(Intent.ACTION_VIEW);
            shortcutIntent.putExtra(Intent.EXTRA_UID, mWorkingNote.getNoteId());
            sender.putExtra(Intent.EXTRA_SHORTCUT_INTENT, shortcutIntent);
            sender.putExtra(Intent.EXTRA_SHORTCUT_NAME,
                    makeShortcutIconTitle(mWorkingNote.getContent()));
            sender.putExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE,
                    Intent.ShortcutIconResource.fromContext(this, R.drawable.icon_app));
            sender.putExtra("duplicate", true);
            sender.setAction("com.android.launcher.action.INSTALL_SHORTCUT");
            showToast(R.string.info_note_enter_desktop);
            sendBroadcast(sender);
        } else {
            /**
             * There is the condition that user has input nothing (the note is
             * not worthy saving), we have no note id, remind the user that he
             * should input something
             */
            Log.e(TAG, "Send to desktop error");
            showToast(R.string.error_note_empty_for_send_to_desktop);
        }
    }

    private String makeShortcutIconTitle(String content) {
        content = content.replace(TAG_CHECKED, "");
        content = content.replace(TAG_UNCHECKED, "");
        return content.length() > SHORTCUT_ICON_TITLE_MAX_LEN ? content.substring(0,
                SHORTCUT_ICON_TITLE_MAX_LEN) : content;
    }

    private void showToast(int resId) {
        showToast(resId, Toast.LENGTH_SHORT);
    }

    private void showToast(int resId, int duration) {
        Toast.makeText(this, resId, duration).show();
    }
}