import 'package:fluent_ui/fluent_ui.dart';
import 'package:task_hub/models/task.dart';

class TaskDialog extends StatefulWidget {
  final Task? task;
  final ValueChanged<Task> onSave;

  const TaskDialog({super.key, this.task, required this.onSave});

  @override
  State<TaskDialog> createState() => _TaskDialogState();
}

class _TaskDialogState extends State<TaskDialog> {
  late TextEditingController _titleController;
  late TextEditingController _descriptionController;
  late Priority _selectedPriority;
  DateTime? _selectedDate;
  final _formKey = GlobalKey<FormState>();

  @override
  void initState() {
    super.initState();
    _titleController = TextEditingController(text: widget.task?.title ?? '');
    _descriptionController = TextEditingController(
      text: widget.task?.description ?? '',
    );
    _selectedPriority = widget.task?.priority ?? Priority.medium;
    _selectedDate = widget.task?.dueDate;
  }

  @override
  void dispose() {
    _titleController.dispose();
    _descriptionController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return ContentDialog(
      title: Text(widget.task == null ? '添加任务' : '编辑任务'),
      content: Form(
        key: _formKey,
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            // 标题
            _buildFormRow(
              label: '任务标题',
              required: true,
              child: TextFormBox(
                controller: _titleController,
                placeholder: '请输入任务标题',
                validator: (value) {
                  if (value == null || value.isEmpty) {
                    return '任务标题不能为空';
                  }
                  return null;
                },
              ),
            ),
            const SizedBox(height: 16),

            // 描述
            _buildFormRow(
              label: '任务描述',
              child: TextFormBox(
                controller: _descriptionController,
                placeholder: '请输入任务描述',
                maxLines: 3,
              ),
            ),
            const SizedBox(height: 16),

            // 优先级
            _buildFormRow(
              label: '优先级',
              child: RadioGroup<Priority>(
                groupValue: _selectedPriority,
                child: Row(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    RadioButton<Priority>(
                      value: Priority.low,
                      content: Text('低'),
                    ),
                    RadioButton<Priority>(
                      value: Priority.medium,
                      content: Text('中'),
                    ),
                    RadioButton<Priority>(
                      value: Priority.high,
                      content: Text('高'),
                    )
                  ],
                ),
                onChanged: (value) {
                  if (value != null) {
                    setState(() {
                      _selectedPriority = value;
                    });
                  }
                },
              ),
            ),
            const SizedBox(height: 16),

            // 截止日期
            _buildFormRow(
              label: '截止日期',
              child: DatePicker(
                selected: _selectedDate,
                onChanged: (date) {
                  setState(() {
                    _selectedDate = date;
                  });
                },
              ),
            ),
          ],
        ),
      ),
      actions: [
        Button(
          child: const Text('取消'),
          onPressed: () => Navigator.pop(context),
        ),
        FilledButton(
          child: const Text('保存'),
          onPressed: () {
            if (_formKey.currentState!.validate()) {
              final task = Task(
                id: widget.task?.id,
                title: _titleController.text,
                description: _descriptionController.text.isEmpty
                    ? null
                    : _descriptionController.text,
                dueDate: _selectedDate,
                priority: _selectedPriority,
                isCompleted: widget.task?.isCompleted ?? false,
              );
              widget.onSave(task);
              Navigator.pop(context);
            }
          },
        ),
      ],
    );
  }

  // 构建表单行
  Widget _buildFormRow({
    required String label,
    required Widget child,
    bool required = false,
  }) {
    return Row(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        SizedBox(
          width: 80,
          child: Padding(
            padding: const EdgeInsets.only(top: 8),
            child: Row(
              mainAxisSize: MainAxisSize.min,
              children: [
                if (required)
                  Padding(
                    padding: EdgeInsets.only(right: 4),
                    child: Text(
                      '*',
                      style: TextStyle(color: Colors.red, fontSize: 16),
                    ),
                  ),
                Text(
                  label,
                  style: const TextStyle(
                    fontSize: 14,
                    fontWeight: FontWeight.w500,
                  ),
                ),
                const Text(
                  ':',
                  style: TextStyle(fontSize: 14),
                ),
              ],
            ),
          ),
        ),
        const SizedBox(width: 12),
        // 右侧表单控件
        Expanded(
          child: child,
        ),
      ],
    );
  }

  String _getPriorityLabel(Priority priority) {
    switch (priority) {
      case Priority.low:
        return '低';
      case Priority.medium:
        return '中';
      case Priority.high:
        return '高';
    }
  }
}