import 'package:flutter/material.dart';

class TodoItem {
  String id;
  String title;
  String? description;
  bool isCompleted;
  DateTime createdAt;
  DateTime? dueDate;
  TodoPriority priority;
  String? category;

  TodoItem({
    required this.id,
    required this.title,
    this.description,
    this.isCompleted = false,
    DateTime? createdAt,
    this.dueDate,
    this.priority = TodoPriority.medium,
    this.category,
  }) : createdAt = createdAt ?? DateTime.now();

  TodoItem copyWith({
    String? id,
    String? title,
    String? description,
    bool? isCompleted,
    DateTime? createdAt,
    DateTime? dueDate,
    TodoPriority? priority,
    String? category,
  }) {
    return TodoItem(
      id: id ?? this.id,
      title: title ?? this.title,
      description: description ?? this.description,
      isCompleted: isCompleted ?? this.isCompleted,
      createdAt: createdAt ?? this.createdAt,
      dueDate: dueDate ?? this.dueDate,
      priority: priority ?? this.priority,
      category: category ?? this.category,
    );
  }
}

enum TodoPriority {
  low('低', Color(0xFF757575), Icons.low_priority),
  medium('中', Color(0xFFF57C00), Icons.flag),
  high('高', Color(0xFFD32F2F), Icons.warning);

  final String label;
  final Color color;
  final IconData icon;

  const TodoPriority(this.label, this.color, this.icon);
}

enum TodoTab {
  all('全部'),
  active('待完成'),
  completed('已完成'),
  today('今天');

  final String label;

  const TodoTab(this.label);
}