import 'package:sqflite/sqflite.dart';
import '../../models/data_models.dart';
import '../database_helper.dart';

/// 笔记数据访问对象
class NoteDao {
  final DatabaseHelper _dbHelper = DatabaseHelper.instance;

  // 获取所有未删除的笔记
  Future<List<Note>> getAllNotes() async {
    final db = await _dbHelper.database;
    final List<Map<String, dynamic>> maps = await db.query(
      'notes',
      where: 'is_deleted = ?',
      whereArgs: [0],
      orderBy: 'created_at DESC',
    );

    return List.generate(maps.length, (i) => Note.fromJson(maps[i]));
  }

  // 分页查询笔记
  Future<List<Note>> getNotesPaged({int limit = 20, int offset = 0}) async {
    final db = await _dbHelper.database;
    final maps = await db.query('notes', where: 'is_deleted = 0',
        orderBy: 'created_at DESC', limit: limit, offset: offset);
    return List.generate(maps.length, (i) => Note.fromJson(maps[i]));
  }

  // 根据ID获取笔记
  Future<Note?> getNoteById(String id) async {
    final db = await _dbHelper.database;
    final List<Map<String, dynamic>> maps = await db.query(
      'notes',
      where: 'id = ?',
      whereArgs: [id],
    );

    if (maps.isEmpty) return null;
    return Note.fromJson(maps.first);
  }

  // 添加笔记
  Future<int> insertNote(Note note) async {
    final db = await _dbHelper.database;
    return await db.insert('notes', note.toJson());
  }

  // 更新笔记
  Future<int> updateNote(Note note) async {
    final db = await _dbHelper.database;
    return await db.update(
      'notes',
      note.toJson(),
      where: 'id = ?',
      whereArgs: [note.id],
    );
  }

  // 软删除笔记
  Future<int> deleteNote(String id) async {
    final db = await _dbHelper.database;
    return await db.update(
      'notes',
      {'is_deleted': 1, 'updated_at': DateTime.now().toIso8601String()},
      where: 'id = ?',
      whereArgs: [id],
    );
  }

  // ========== 回收站相关方法 ==========

  // 获取已删除的笔记
  Future<List<Note>> getDeletedNotes() async {
    final db = await _dbHelper.database;
    final List<Map<String, dynamic>> maps = await db.query(
      'notes',
      where: 'is_deleted = ?',
      whereArgs: [1],
      orderBy: 'created_at DESC',
    );

    return List.generate(maps.length, (i) => Note.fromJson(maps[i]));
  }

  // 恢复已删除的笔记
  Future<int> restoreNote(String id) async {
    final db = await _dbHelper.database;
    return await db.update(
      'notes',
      {'is_deleted': 0, 'updated_at': DateTime.now().toIso8601String()},
      where: 'id = ?',
      whereArgs: [id],
    );
  }

  // 彻底删除笔记
  Future<int> permanentDeleteNote(String id) async {
    final db = await _dbHelper.database;
    return await db.delete(
      'notes',
      where: 'id = ?',
      whereArgs: [id],
    );
  }

  // 搜索笔记
  Future<List<Note>> searchNotes(String query) async {
    final db = await _dbHelper.database;
    final List<Map<String, dynamic>> maps = await db.query(
      'notes',
      where: '(title LIKE ? OR content LIKE ? OR tags LIKE ?) AND is_deleted = ?',
      whereArgs: ['%$query%', '%$query%', '%$query%', 0],
      orderBy: 'created_at DESC',
    );

    return List.generate(maps.length, (i) => Note.fromJson(maps[i]));
  }

  // 根据标签筛选
  Future<List<Note>> getNotesByTag(String tag) async {
    final db = await _dbHelper.database;
    final List<Map<String, dynamic>> maps = await db.query(
      'notes',
      where: 'tags LIKE ? AND is_deleted = ?',
      whereArgs: ['%$tag%', 0],
      orderBy: 'created_at DESC',
    );

    return List.generate(maps.length, (i) => Note.fromJson(maps[i]));
  }
}