import 'package:fluent_ui/fluent_ui.dart';
import 'package:omni_datetime_picker/omni_datetime_picker.dart';
import 'package:task_hub/models/schedule.dart';
import 'package:task_hub/widgets/common.dart';

class ScheduleDialog extends StatefulWidget {
  final Schedule? schedule;
  final ValueChanged<Schedule> onSave;

  const ScheduleDialog({super.key, this.schedule, required this.onSave});

  @override
  State<ScheduleDialog> createState() => _ScheduleDialogState();
}

class _ScheduleDialogState extends State<ScheduleDialog> {
  late TextEditingController _titleController;
  DateTime? _selectedStartTime;
  DateTime? _selectedEndTime;
  DateTime? _selectedScheduleTime;
  final _formKey = GlobalKey<FormState>();

  @override
  void initState() {
    super.initState();
    _titleController = TextEditingController(
      text: widget.schedule?.title ?? '',
    );
    _selectedStartTime = widget.schedule?.startTime;
    _selectedEndTime = widget.schedule?.endTime;
    _selectedScheduleTime = widget.schedule?.scheduleTime;
  }

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

  void onConfirmClick() async {
    if (_selectedStartTime == null) {
      await displayInfoBar(
        context,
        builder: (context, close) {
          return InfoBar(
            title: const Text('请选择开始时间'),
            severity: InfoBarSeverity.error,
          );
        },
      );
      return;
    }

    if (_selectedEndTime == null) {
      await displayInfoBar(
        context,
        builder: (context, close) {
          return InfoBar(
            title: const Text('请选择结束时间'),
            severity: InfoBarSeverity.error,
          );
        },
      );
      return;
    }

    if (!_selectedEndTime!.isAfter(_selectedStartTime!)) {
      await displayInfoBar(
        context,
        builder: (context, close) {
          return InfoBar(
            title: const Text('结束时间必须晚于开始时间'),
            severity: InfoBarSeverity.error,
          );
        },
      );
      return;
    }

    if (_formKey.currentState!.validate()) {
      final schedule = Schedule(
        id: widget.schedule?.id,
        title: _titleController.text,
        startTime: _selectedStartTime!,
        endTime: _selectedEndTime!,
        scheduleTime: _selectedScheduleTime,
      );
      widget.onSave(schedule);
      Navigator.pop(context);
    }
  }

  @override
  Widget build(BuildContext context) {
    return ContentDialog(
      title: Center(child: Text(widget.schedule == null ? '添加日程' : '编辑日程')),
      content: _buildForm(),
      actions: [
        Button(
          child: const Text('取消'),
          onPressed: () => Navigator.pop(context),
        ),
        FilledButton(child: const Text('保存'), onPressed: onConfirmClick),
      ],
    );
  }

  Widget _buildForm() {
    return Form(
      key: _formKey,
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          // 标题
          buildFormItem(
            label: '日程标题',
            required: true,
            child: TextFormBox(
              controller: _titleController,
              placeholder: '请输入日程标题',
              validator: (value) {
                if (value == null || value.isEmpty) {
                  return '任务标题不能为空';
                }
                return null;
              },
            ),
          ),
          const SizedBox(height: 16),

          // 开始时间
          buildFormItem(
            label: '开始时间',
            required: true,
            child: buildOmniDateButton(
              context: context,
              selectedDate: _selectedStartTime,
              placeholder: '请选择开始时间',
              type: OmniDateTimePickerType.dateAndTime,
              onChanged: (date) {
                setState(() {
                  _selectedStartTime = date!;
                });
              },
            ),
          ),
          const SizedBox(height: 16),

          // 结束时间
          buildFormItem(
            label: '结束时间',
            required: true,
            child: buildOmniDateButton(
              context: context,
              selectedDate: _selectedEndTime,
              placeholder: '请选择结束时间',
              type: OmniDateTimePickerType.dateAndTime,
              onChanged: (date) {
                setState(() {
                  _selectedEndTime = date!;
                });
              },
            ),
          ),
          const SizedBox(height: 16),

          // 提醒日期
          buildFormItem(
            label: '提醒日期',
            child: buildOmniDateButton(
              context: context,
              selectedDate: _selectedScheduleTime,
              placeholder: '请选择提醒日期',
              type: OmniDateTimePickerType.dateAndTime,
              onChanged: (date) {
                setState(() {
                  _selectedScheduleTime = date;
                });
              },
            ),
          ),
        ],
      ),
    );
  }
}