import 'package:flisp_app/models/todo.dart';
import 'package:intl/intl.dart';

List<Todo> getActiveTodos(TodoTab currentTab, List<Todo> todos) {
  switch (currentTab) {
    case TodoTab.active:
      return todos.where((todo) => !todo.isCompleted).toList();
    case TodoTab.completed:
      return todos.where((todo) => todo.isCompleted).toList();
    case TodoTab.today:
      final today = DateTime.now();
      return todos
          .where(
            (todo) =>
        todo.dueDate != null &&
            todo.dueDate!.year == today.year &&
            todo.dueDate!.month == today.month &&
            todo.dueDate!.day == today.day,
      )
          .toList();
    default:
      return todos;
  }
}

// 格式化截止日期
String formatDueDate(DateTime dueDate, bool isToday, bool isTomorrow) {
  final now = DateTime.now();
  final today = DateTime(now.year, now.month, now.day);
  final dueDateStart = DateTime(dueDate.year, dueDate.month, dueDate.day);
  final difference = dueDateStart.difference(today);

  // 处理过期情况
  if (difference.inDays < 0) {
    final daysPast = -difference.inDays;
    return '已过期$daysPast天';
  }

  // 处理未来日期
  if (difference.inDays == 0) return '今天截止';
  if (difference.inDays == 1) return '明天截止';
  if (difference.inDays == 2) return '后天截止';
  if (difference.inDays < 7) return '${difference.inDays}天后截止';

  return DateFormat("MM-dd").format(dueDate);
}

bool isSameDay(DateTime date1, DateTime date2) {
  return date1.year == date2.year &&
      date1.month == date2.month &&
      date1.day == date2.day;
}