/*
 * 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.database.Cursor;
import android.graphics.Paint;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
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.WindowManager;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import androidx.core.content.ContextCompat;

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;

/**
 * 笔记编辑界面，支持文本编辑、列表模式、提醒设置等功能
 */
public class NoteEditActivity extends Activity implements OnClickListener,
        NoteSettingChangedListener, OnTextViewChangeListener {
    
    // 视图持有者类，用于缓存头部视图引用
    private class HeadViewHolder {
        public TextView tvModified;
        public ImageView ivAlertIcon;
        public TextView tvAlertDate;
        public ImageView ibSetBgColor;
    }

    // 背景色选择器按钮映射
    private static final Map<Integer, Integer> sBgSelectorBtnsMap = new HashMap<>();
    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);
    }

    // 背景色选择状态映射
    private static final Map<Integer, Integer> sBgSelectorSelectionMap = new HashMap<>();
    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
    private static final Map<Integer, Integer> sFontSizeBtnsMap = new HashMap<>();
    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);
    }

    // 字体选择状态映射
    private static final Map<Integer, Integer> sFontSelectorSelectionMap = new HashMap<>();
    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";
    private static final String STATE_NOTE_ID = "state_note_id";
    private static final String PREFERENCE_FONT_SIZE = "pref_font_size";
    private static final int SHORTCUT_ICON_TITLE_MAX_LEN = 10;
    public static final String TAG_CHECKED = String.valueOf('\u221A');
    public static final String TAG_UNCHECKED = String.valueOf('\u25A1');
    
    // 视图引用
    private HeadViewHolder mNoteHeaderHolder;
    private View mHeadViewPanel;
    private View mNoteBgColorSelector;
    private View mFontSizeSelector;
    private EditText mNoteEditor;
    private View mNoteEditorPanel;
    private LinearLayout mEditTextList;
    
    // 数据和状态
    private WorkingNote mWorkingNote;
    private SharedPreferences mSharedPrefs;
    private int mFontSizeId;
    private String mUserQuery;
    private Pattern mPattern;
    private Handler mHandler;
    
    // 动画效果
    private Animation mFadeInAnimation;
    private Animation mFadeOutAnimation;
    
    // 保存状态标志
    private boolean mIsSaving = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.note_edit);
        
        // 初始化资源和视图
        mHandler = new Handler(Looper.getMainLooper());
        initAnimations();
        initResources();
        
        // 恢复或初始化活动状态
        if (savedInstanceState == null && !initActivityState(getIntent())) {
            finish();
            return;
        }
    }

    /**
     * 初始化动画效果
     */
    private void initAnimations() {
        mFadeInAnimation = AnimationUtils.loadAnimation(this, android.R.anim.fade_in);
        mFadeOutAnimation = AnimationUtils.loadAnimation(this, android.R.anim.fade_out);
    }

    /**
     * 初始化活动状态，处理不同来源的 Intent
     */
    private boolean initActivityState(Intent intent) {
        mWorkingNote = null;
        
        if (TextUtils.equals(Intent.ACTION_VIEW, intent.getAction())) {
            // 查看已有笔记
            long noteId = intent.getLongExtra(Intent.EXTRA_UID, 0);
            mUserQuery = "";

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

            if (!DataUtils.visibleInNoteDatabase(getContentResolver(), noteId, Notes.TYPE_NOTE)) {
                navigateToListView(R.string.error_note_not_exist);
                return false;
            } else {
                mWorkingNote = WorkingNote.load(this, noteId);
                if (mWorkingNote == null) {
                    Log.e(TAG, "load note failed with note id" + noteId);
                    finish();
                    return false;
                }
            }
            // 设置软键盘行为
            getWindow().setSoftInputMode(
                    WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN
                            | WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE);
        } else if (TextUtils.equals(Intent.ACTION_INSERT_OR_EDIT, intent.getAction())) {
            // 新建笔记
            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));

            // 处理通话记录笔记
            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;
                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 {
                    mWorkingNote = WorkingNote.createEmptyNote(this, folderId, widgetId,
                            widgetType, bgResId);
                    mWorkingNote.convertToCallNote(phoneNumber, callDate);
                }
            } else {
                mWorkingNote = WorkingNote.createEmptyNote(this, folderId, widgetId, widgetType,
                        bgResId);
            }

            // 设置软键盘行为
            getWindow().setSoftInputMode(
                    WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE
                            | WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);
        } else {
            Log.e(TAG, "Intent not specified action, should not support");
            finish();
            return false;
        }
        
        mWorkingNote.setOnSettingStatusChangedListener(this);
        return true;
    }

    /**
     * 导航到笔记列表视图并显示提示信息
     */
    private void navigateToListView(int messageResId) {
        Intent jump = new Intent(this, NotesListActivity.class);
        startActivity(jump);
        showToast(messageResId);
        finish();
    }

    /**
     * 恢复被系统杀死的活动状态
     */
    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        if (savedInstanceState != null && savedInstanceState.containsKey(STATE_NOTE_ID)) {
            Intent intent = new Intent(Intent.ACTION_VIEW);
            intent.putExtra(Intent.EXTRA_UID, savedInstanceState.getLong(STATE_NOTE_ID));
            if (!initActivityState(intent)) {
                finish();
                return;
            }
            Log.d(TAG, "Restoring from killed activity");
        }
    }

    @Override
    protected void onResume() {
        super.onResume();
        initNoteScreen();
    }

    /**
     * 初始化笔记屏幕显示
     */
    private void initNoteScreen() {
        // 应用字体设置
        mNoteEditor.setTextAppearance(this, TextAppearanceResources
                .getTexAppearanceResource(mFontSizeId));
        
        // 设置编辑模式
        if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) {
            switchToListMode(mWorkingNote.getContent());
        } else {
            mNoteEditor.setText(getHighlightQueryResult(mWorkingNote.getContent(), mUserQuery));
            mNoteEditor.setSelection(mNoteEditor.getText().length());
        }
        
        // 更新背景色选择器状态
        updateBgSelectorState();
        
        // 设置背景色
        mHeadViewPanel.setBackgroundResource(mWorkingNote.getTitleBgResId());
        mNoteEditorPanel.setBackgroundResource(mWorkingNote.getBgColorResId());

        // 更新修改日期显示
        updateModifiedDate();
        
        // 显示提醒信息
        showAlertHeader();
    }

    /**
     * 更新背景色选择器状态
     */
    private void updateBgSelectorState() {
        for (Integer id : sBgSelectorSelectionMap.keySet()) {
            findViewById(sBgSelectorSelectionMap.get(id)).setVisibility(View.GONE);
        }
        findViewById(sBgSelectorSelectionMap.get(mWorkingNote.getBgColorId())).setVisibility(View.VISIBLE);
    }

    /**
     * 更新修改日期显示
     */
    private void updateModifiedDate() {
        mNoteHeaderHolder.tvModified.setText(DateUtils.formatDateTime(this,
                mWorkingNote.getModifiedDate(), DateUtils.FORMAT_SHOW_DATE
                        | DateUtils.FORMAT_NUMERIC_DATE | DateUtils.FORMAT_SHOW_TIME
                        | DateUtils.FORMAT_SHOW_YEAR));
    }

    /**
     * 显示提醒信息
     */
    private void showAlertHeader() {
        if (mWorkingNote.hasClockAlert()) {
            long time = System.currentTimeMillis();
            if (time > mWorkingNote.getAlertDate()) {
                mNoteHeaderHolder.tvAlertDate.setText(R.string.note_alert_expired);
            } else {
                mNoteHeaderHolder.tvAlertDate.setText(DateUtils.getRelativeTimeSpanString(
                        mWorkingNote.getAlertDate(), time, DateUtils.MINUTE_IN_MILLIS));
            }
            mNoteHeaderHolder.tvAlertDate.setVisibility(View.VISIBLE);
            mNoteHeaderHolder.ivAlertIcon.setVisibility(View.VISIBLE);
        } else {
            mNoteHeaderHolder.tvAlertDate.setVisibility(View.GONE);
            mNoteHeaderHolder.ivAlertIcon.setVisibility(View.GONE);
        }
    }

    @Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);
        initActivityState(intent);
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        // 保存笔记以生成ID
        if (!mWorkingNote.existInDatabase()) {
            saveNote();
        }
        outState.putLong(STATE_NOTE_ID, mWorkingNote.getNoteId());
        Log.d(TAG, "Save working note id: " + mWorkingNote.getNoteId() + " onSaveInstanceState");
    }

    @Override
    protected void onDestroy() {
        // 清理资源
        if (mWorkingNote != null) {
            mWorkingNote.setOnSettingStatusChangedListener(null);
        }
        super.onDestroy();
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        // 点击外部区域关闭选择器
        if (mNoteBgColorSelector.getVisibility() == View.VISIBLE
                && !inRangeOfView(mNoteBgColorSelector, ev)) {
            hideBgColorSelector();
            return true;
        }

        if (mFontSizeSelector.getVisibility() == View.VISIBLE
                && !inRangeOfView(mFontSizeSelector, ev)) {
            hideFontSizeSelector();
            return true;
        }
        return super.dispatchTouchEvent(ev);
    }

    /**
     * 检查触摸事件是否在视图范围内
     */
    private boolean inRangeOfView(View view, MotionEvent ev) {
        int[] location = new int[2];
        view.getLocationOnScreen(location);
        int x = location[0];
        int y = location[1];
        return !(ev.getX() < x
                || ev.getX() > (x + view.getWidth())
                || ev.getY() < y
                || ev.getY() > (y + view.getHeight()));
    }

    /**
     * 初始化资源和视图引用
     */
    private void initResources() {
        mHeadViewPanel = findViewById(R.id.note_title);
        mNoteHeaderHolder = new HeadViewHolder();
        mNoteHeaderHolder.tvModified = findViewById(R.id.tv_modified_date);
        mNoteHeaderHolder.ivAlertIcon = findViewById(R.id.iv_alert_icon);
        mNoteHeaderHolder.tvAlertDate = findViewById(R.id.tv_alert_date);
        mNoteHeaderHolder.ibSetBgColor = findViewById(R.id.btn_set_bg_color);
        mNoteHeaderHolder.ibSetBgColor.setOnClickListener(this);
        
        mNoteEditor = findViewById(R.id.note_edit_view);
        mNoteEditorPanel = findViewById(R.id.sv_note_edit);
        mNoteBgColorSelector = findViewById(R.id.note_bg_color_selector);
        
        // 初始化背景色选择器按钮
        for (int id : sBgSelectorBtnsMap.keySet()) {
            ImageView iv = 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);
        }
        
        // 加载字体设置
        mSharedPrefs = PreferenceManager.getDefaultSharedPreferences(this);
        mFontSizeId = mSharedPrefs.getInt(PREFERENCE_FONT_SIZE, ResourceParser.BG_DEFAULT_FONT_SIZE);
        
        // 修复字体设置可能的问题
        if (mFontSizeId >= TextAppearanceResources.getResourcesSize()) {
            mFontSizeId = ResourceParser.BG_DEFAULT_FONT_SIZE;
        }
        
        mEditTextList = findViewById(R.id.note_edit_list);
    }

    @Override
    protected void onPause() {
        super.onPause();
        // 保存笔记
        if (saveNote()) {
            Log.d(TAG, "Note data was saved with length:" + mWorkingNote.getContent().length());
        }
        // 清除设置状态
        clearSettingState();
    }

    /**
     * 更新小部件
     */
    private void updateWidget() {
        if (mWorkingNote.getWidgetType() == Notes.TYPE_WIDGET_INVALIDE) {
            return;
        }
        
        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, "Unsupported widget type");
            return;
        }

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

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

    @Override
    public void onClick(View v) {
        int id = v.getId();
        if (id == R.id.btn_set_bg_color) {
            // 显示背景色选择器
            showBgColorSelector();
        } else if (sBgSelectorBtnsMap.containsKey(id)) {
            // 选择背景色
            setBackgroundColor(id);
        } else if (sFontSizeBtnsMap.containsKey(id)) {
            // 选择字体大小
            setFontSize(id);
        }
    }

    /**
     * 显示背景色选择器
     */
    private void showBgColorSelector() {
        mNoteBgColorSelector.setVisibility(View.VISIBLE);
        mNoteBgColorSelector.startAnimation(mFadeInAnimation);
        updateBgSelectorState();
    }

    /**
     * 隐藏背景色选择器
     */
    private void hideBgColorSelector() {
        mNoteBgColorSelector.startAnimation(mFadeOutAnimation);
        mNoteBgColorSelector.setVisibility(View.GONE);
    }

    /**
     * 设置背景色
     */
    private void setBackgroundColor(int viewId) {
        findViewById(sBgSelectorSelectionMap.get(mWorkingNote.getBgColorId())).setVisibility(View.GONE);
        mWorkingNote.setBgColorId(sBgSelectorBtnsMap.get(viewId));
        hideBgColorSelector();
    }

    /**
     * 设置字体大小
     */
    private void setFontSize(int viewId) {
        findViewById(sFontSelectorSelectionMap.get(mFontSizeId)).setVisibility(View.GONE);
        mFontSizeId = sFontSizeBtnsMap.get(viewId);
        mSharedPrefs.edit().putInt(PREFERENCE_FONT_SIZE, mFontSizeId).apply();
        findViewById(sFontSelectorSelectionMap.get(mFontSizeId)).setVisibility(View.VISIBLE);
        
        // 应用字体大小
        if (mWorkingNote.getCheckListMode() == TextNote.MODE_CHECK_LIST) {
            getWorkingText();
            switchToListMode(mWorkingNote.getContent());
        } else {
            mNoteEditor.setTextAppearance(this,
                    TextAppearanceResources.getTexAppearanceResource(mFontSizeId));
        }
        
        hideFontSizeSelector();
    }

    /**
     * 显示字体大小选择器
     */
    private void showFontSizeSelector() {
        mFontSizeSelector.setVisibility(View.VISIBLE);
        mFontSizeSelector.startAnimation(mFadeInAnimation);
        findViewById(sFontSelectorSelectionMap.get(mFontSizeId)).setVisibility(View.VISIBLE);
    }

    /**
     * 隐藏字体大小选择器
     */
    private void hideFontSizeSelector() {
        mFontSizeSelector.startAnimation(mFadeOutAnimation);
        mFontSizeSelector.setVisibility(View.GONE);
    }

    @Override
    public void onBackPressed() {
        if (clearSettingState()) {
            return;
        }

        // 保存笔记并退出
        saveNoteWithProgress();
        super.onBackPressed();
    }

    /**
     * 清除设置状态（关闭选择器）
     */
    private boolean clearSettingState() {
        if (mNoteBgColorSelector.getVisibility() == View.VISIBLE) {
            hideBgColorSelector();
            return true;
        } else if (mFontSizeSelector.getVisibility() == View.VISIBLE) {
            hideFontSizeSelector();
            return true;
        }
        return false;
    }

    @Override
    public void onBackgroundColorChanged() {
        // 更新背景色
        mNoteEditorPanel.setBackgroundResource(mWorkingNote.getBgColorResId());
        mHeadViewPanel.setBackgroundResource(mWorkingNote.getTitleBgResId());
    }

    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        if (isFinishing()) {
            return true;
        }
        clearSettingState();
        menu.clear();
        
        // 根据笔记类型加载不同菜单
        if (mWorkingNote.getFolderId() == Notes.ID_CALL_RECORD_FOLDER) {
            getMenuInflater().inflate(R.menu.call_note_edit, menu);
        } else {
            getMenuInflater().inflate(R.menu.note_edit, menu);
        }
        
        // 设置菜单状态
        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);
        }
        
        if (mWorkingNote.hasClockAlert()) {
            menu.findItem(R.id.menu_alert).setVisible(false);
        } else {
            menu.findItem(R.id.menu_delete_remind).setVisible(false);
        }
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.menu_new_note:
                createNewNote();
                break;
            case R.id.menu_delete:
                confirmDeleteNote();
                break;
            case R.id.menu_font_size:
                showFontSizeSelector();
                break;
            case R.id.menu_list_mode:
                toggleListMode();
                break;
            case R.id.menu_share:
                shareNote();
                break;
            case R.id.menu_send_to_desktop:
                sendToDesktop();
                break;
            case R.id.menu_alert:
                setReminder();
                break;
            case R.id.menu_delete_remind:
                deleteReminder();
                break;
            default:
                break;
        }
        return true;
    }

    /**
     * 设置提醒
     */
    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);
                showToast(R.string.info_reminder_set);
            }
        });
        d.show();
    }

    /**
     * 删除提醒
     */
    private void deleteReminder() {
        mWorkingNote.setAlertDate(0, false);
        showToast(R.string.info_reminder_deleted);
    }

    /**
     * 分享笔记内容
     */
    private void shareNote() {
        getWorkingText();
        sendTo(this, mWorkingNote.getContent());
    }

    /**
     * 分享内容到其他应用
     */
    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.createChooser(intent, getString(R.string.share_via)));
    }

    /**
     * 创建新笔记
     */
    private void createNewNote() {
        // 先保存当前笔记
        saveNote();

        // 启动新的编辑界面
        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);
    }

    /**
     * 确认删除笔记
     */
    private void confirmDeleteNote() {
        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();
    }

    /**
     * 删除当前笔记
     */
    private void deleteCurrentNote() {
        if (mWorkingNote.existInDatabase()) {
            HashSet<Long> ids = new HashSet<>();
            long id = mWorkingNote.getNoteId();
            if (id != Notes.ID_ROOT_FOLDER) {
                ids.add(id);
            } else {
                Log.d(TAG, "Wrong note id, should not happen");
            }
            
            // 根据同步模式决定是删除还是移动到回收站
            if (!isSyncMode()) {
                if (!DataUtils.batchDeleteNotes(getContentResolver(), ids)) {
                    Log.e(TAG, "Delete Note error");
                    showToast(R.string.error_delete_failed);
                } else {
                    showToast(R.string.info_note_deleted);
                }
            } else {
                if (!DataUtils.batchMoveToFolder(getContentResolver(), ids, Notes.ID_TRASH_FOLER)) {
                    Log.e(TAG, "Move notes to trash folder error, should not happens");
                    showToast(R.string.error_move_to_trash_failed);
                } else {
                    showToast(R.string.info_note_moved_to_trash);
                }
            }
        }
        mWorkingNote.markDeleted(true);
    }

    /**
     * 检查是否为同步模式
     */
    private boolean isSyncMode() {
        return NotesPreferenceActivity.getSyncAccountName(this).trim().length() > 0;
    }

    /**
     * 提醒设置变更回调
     */
    public void onClockAlertChanged(long date, boolean set) {
        // 保存笔记以确保有ID
        if (!mWorkingNote.existInDatabase()) {
            saveNote();
        }
        
        if (mWorkingNote.getNoteId() > 0) {
            Intent intent = new Intent(this, AlarmReceiver.class);
            intent.setData(ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, mWorkingNote.getNoteId()));
            
            // 使用更安全的PendingIntent标志
            int flags = PendingIntent.FLAG_UPDATE_CURRENT;
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                flags |= PendingIntent.FLAG_IMMUTABLE;
            }
            
            PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, intent, flags);
            AlarmManager alarmManager = ((AlarmManager) getSystemService(ALARM_SERVICE));
            showAlertHeader();
            
            if (!set) {
                alarmManager.cancel(pendingIntent);
            } else {
                alarmManager.set(AlarmManager.RTC_WAKEUP, date, pendingIntent);
            }
        } else {
            // 处理无ID的情况
            Log.e(TAG, "Clock alert setting error");
            showToast(R.string.error_note_empty_for_clock);
        }
    }

    /**
     * 小部件变更回调
     */
    public void onWidgetChanged() {
        updateWidget();
    }

    /**
     * 编辑文本删除回调
     */
    public void onEditTextDelete(int index, String text) {
        int childCount = mEditTextList.getChildCount();
        if (childCount == 1) {
            return;
        }

        // 调整后续项目的索引
        for (int i = index + 1; i < childCount; i++) {
            ((NoteEditText) mEditTextList.getChildAt(i).findViewById(R.id.et_edit_text))
                    .setIndex(i - 1);
        }

        // 删除当前项目并将文本附加到前一个项目
        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);
    }

    /**
     * 编辑文本换行回调
     */
    public void onEditTextEnter(int index, String text) {
        if (index > mEditTextList.getChildCount()) {
            Log.e(TAG, "Index out of mEditTextList boundrary, should not happen");
        }

        // 添加新项目并调整后续项目的索引
        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);
        }
    }

    /**
     * 切换到列表模式
     */
    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);
    }

    /**
     * 高亮显示搜索结果
     */
    private Spannable getHighlightQueryResult(String fullText, String userQuery) {
        SpannableString spannable = new SpannableString(fullText == null ? "" : fullText);
        if (!TextUtils.isEmpty(userQuery)) {
            mPattern = Pattern.compile(userQuery, Pattern.CASE_INSENSITIVE);
            Matcher m = mPattern.matcher(fullText);
            int start = 0;
            while (m.find(start)) {
                spannable.setSpan(
                        new BackgroundColorSpan(ContextCompat.getColor(this,
                                R.color.user_query_highlight)), m.start(), m.end(),
                        Spannable.SPAN_INCLUSIVE_EXCLUSIVE);
                start = m.end();
            }
        }
        return spannable;
    }

    /**
     * 获取列表项视图
     */
    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);
                }
            }
        });

        // 处理已选中或未选中的项目
        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));
        
        // 根据文本内容显示或隐藏复选框
        if (TextUtils.isEmpty(item)) {
            cb.setVisibility(View.GONE);
        } else {
            cb.setVisibility(View.VISIBLE);
        }
        
        return view;
    }

    /**
     * 文本变化回调
     */
    public void onTextChange(int index, boolean hasText) {
        if (index >= mEditTextList.getChildCount()) {
            Log.e(TAG, "Wrong index, should not happen");
            return;
        }
        // 根据文本内容显示或隐藏复选框
        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);
        }
    }

    /**
     * 列表模式切换回调
     */
    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);
        }
    }

    /**
     * 切换列表模式
     */
    private void toggleListMode() {
        mWorkingNote.setCheckListMode(mWorkingNote.getCheckListMode() == 0 ?
                TextNote.MODE_CHECK_LIST : 0);
    }

    /**
     * 获取工作文本内容
     */
    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;
    }

    /**
     * 保存笔记（带进度显示）
     */
    private void saveNoteWithProgress() {
        // 显示保存进度
        showToast(R.string.info_saving);
        
        // 在后台线程保存
        new Thread(() -> {
            boolean saved = saveNote();
            mHandler.post(() -> {
                if (saved) {
                    showToast(R.string.info_saved);
                } else {
                    showToast(R.string.error_save_failed);
                }
            });
        }).start();
    }

    /**
     * 保存笔记
     */
    private boolean saveNote() {
        if (mIsSaving) {
            return true; // 避免重复保存
        }
        
        mIsSaving = true;
        try {
            getWorkingText();
            boolean saved = mWorkingNote.saveNote();
            if (saved) {
                // 更新修改日期显示
                updateModifiedDate();
                setResult(RESULT_OK);
            }
            return saved;
        } finally {
            mIsSaving = false;
        }
    }

    /**
     * 添加到桌面快捷方式
     */
    private void sendToDesktop() {
        // 确保笔记已保存
        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 {
            // 处理无ID的情况
            Log.e(TAG, "Send to desktop error");
            showToast(R.string.error_note_empty_for_send_to_desktop);
        }
    }

    /**
     * 生成快捷方式标题
     */
    private String make