import 'package:flisp_app/models/todo.dart';
import 'package:flisp_app/widgets/common.dart';
import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import 'package:toggle_switch/toggle_switch.dart';

// 统计卡片
Widget buildStatsCard(List<Todo> todos) {
  int totalCount = todos.length;

  int activeCount = todos.where((todo) => !todo.isCompleted).length;

  int completedCount = todos.where((todo) => todo.isCompleted).length;

  return buildCard(
    child: Row(
      mainAxisAlignment: MainAxisAlignment.spaceAround,
      children: [
        _buildStatItem('总计', totalCount, Colors.blue),
        _buildStatItem('待完成', activeCount, Colors.orange),
        _buildStatItem('已完成', completedCount, Colors.green),
      ],
    ),
  );
}

Widget _buildStatItem(String label, int count, Color color) {
  return Column(
    children: [
      Text(
        count.toString(),
        style: TextStyle(
          fontSize: 24,
          fontWeight: FontWeight.bold,
          color: color,
        ),
      ),
      const SizedBox(height: 4),
      Text(label, style: const TextStyle(fontSize: 12, color: Colors.grey)),
    ],
  );
}

// Tab页
Widget buildTabs({
  required TodoTab currentTab,
  required ValueChanged<TodoTab> onTabChanged,
}) {
  return Container(
    padding: EdgeInsets.all(8),
    child: ToggleSwitch(
      minWidth: 90.0,
      minHeight: 40.0,
      initialLabelIndex: TodoTab.values.indexOf(currentTab),
      totalSwitches: TodoTab.values.length,
      labels: TodoTab.values.map((e) => e.label).toList(),
      activeBgColor: [Colors.orange.shade600],
      activeFgColor: Colors.white,
      inactiveBgColor: Colors.grey.shade200,
      inactiveFgColor: Colors.grey.shade700,
      cornerRadius: 12.0,
      customTextStyles: [TextStyle(fontSize: 12, fontWeight: FontWeight.w500)],
      onToggle: (index) {
        if (index != null) {
          onTabChanged(TodoTab.values[index]);
        }
      },
    ),
  );
}

Widget buildTodoList({
  required List<Todo> todos,
  required ValueChanged<Todo> onToggleTodo,
  required ValueChanged<Todo> onEditTodo,
}) {
  return ListView.separated(
    itemCount: todos.length,
    separatorBuilder: (context, index) => SizedBox(height: 8),
    itemBuilder: (context, index) {
      final todo = todos[index];
      return _buildTodoItem(
        todo: todo,
        onToggle: onToggleTodo,
        onEdit: onEditTodo,
      );
    },
  );
}

Widget _buildTodoItem({
  required Todo todo,
  required ValueChanged<Todo> onToggle,
  required ValueChanged<Todo> onEdit,
}) {
  return buildCard(
    child: ListTile(
      contentPadding: EdgeInsets.symmetric(horizontal: 8, vertical: 0),
      leading: SizedBox(
        width: 24,
        child: Checkbox(
          value: todo.isCompleted,
          onChanged: (value) => onToggle(todo),
          materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
        ),
      ),
      title: _buildTodoTitle(todo),
      subtitle: _buildTodoSubtitle(todo),
      trailing: _buildPriorityBadge(todo.priority),
      onTap: () => onEdit(todo),
      // onLongPress: () => onShowOptions(todo),
    ),
  );
}

Widget _buildTodoTitle(Todo todo) {
  return Text(
    todo.title,
    style: TextStyle(
      decoration: todo.isCompleted ? TextDecoration.lineThrough : null,
      color: todo.isCompleted ? Colors.grey : null,
      fontSize: 16,
      fontWeight: FontWeight.w500,
    ),
  );
}

// 构建待办事项副标题
Widget? _buildTodoSubtitle(Todo todo) {
  final isOverdue =
      todo.dueDate != null &&
          todo.dueDate!.isBefore(DateTime.now()) &&
          !todo.isCompleted;

  final hasContent = todo.content.isNotEmpty == true || todo.dueDate != null;

  if (!hasContent) return null;

  return Column(
    crossAxisAlignment: CrossAxisAlignment.start,
    children: [
      SizedBox(height: 4),
      if (todo.content.isNotEmpty == true)
        Text(
          todo.content,
          maxLines: 1,
          overflow: TextOverflow.ellipsis,
          style: TextStyle(
            fontSize: 14,
            color: Colors.grey[700],
          ),
        ),
      SizedBox(height: 8),
      if (todo.dueDate != null)
        Container(
          padding: EdgeInsets.symmetric(horizontal: 8, vertical: 2),
          decoration: BoxDecoration(
            color: isOverdue ? Colors.red[50] : Colors.grey[50],
            borderRadius: BorderRadius.circular(4),
            border: Border.all(
              color: isOverdue ? Colors.red[100]! : Colors.grey[300]!,
            ),
          ),
          child: Text(
            '截止: ${DateFormat("yyyy-MM-dd").format(todo.dueDate!)}',
            style: TextStyle(
              fontSize: 11,
              color: isOverdue ? Colors.red[600] : Colors.grey[600],
              fontWeight: isOverdue ? FontWeight.w600 : FontWeight.normal,
            ),
          ),
        ),
    ],
  );
}

// 构建优先级徽章
Widget _buildPriorityBadge(TodoPriority priority) {
  return Chip(
    label: Text(priority.label),
    backgroundColor: priority.color,
    labelStyle: TextStyle(color: Colors.white, fontWeight: FontWeight.bold),
    shape: RoundedRectangleBorder(
      borderRadius: BorderRadius.circular(8),
      side: BorderSide(color: Colors.white),
    ),
    materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
    visualDensity: VisualDensity.compact,
  );
}

// 空状态
Widget buildEmptyState(TodoTab tab) {
  final messages = {
    TodoTab.all: '📝 还没有待办事项\n点击➕号添加第一个任务吧～',
    TodoTab.active: '🎯 没有待完成的任务\n享受轻松时光吧！✨',
    TodoTab.completed: '🎉 还没有完成的任务\n加油哦！💪',
    TodoTab.today: '📅 今天没有安排任务\n好好放松一下吧～😊',
  };

  return Center(
    child: Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        Icon(Icons.checklist, size: 80, color: Colors.orange.shade600),
        Text(
          messages[tab] ?? '暂无数据',
          textAlign: TextAlign.center,
          style: TextStyle(color: Colors.orange.shade600),
        ),
      ],
    ),
  );
}