submanager/lib/widgets/common/form_fields/date_picker_field.dart

import 'package:flutter/material.dart';
import 'package:intl/intl.dart';

/// 날짜 선택 필드 위젯
/// 탭하면 날짜 선택기가 표시되며, 선택된 날짜를 보기 좋은 형식으로 표시합니다.
class DatePickerField extends StatelessWidget {
  final DateTime selectedDate;
  final Function(DateTime) onDateSelected;
  final String label;
  final String? hintText;
  final DateTime? firstDate;
  final DateTime? lastDate;
  final bool enabled;
  final FocusNode? focusNode;
  final Color? backgroundColor;
  final EdgeInsetsGeometry? contentPadding;
  final String? dateFormat;
  final Color? primaryColor;

  const DatePickerField({
    super.key,
    required this.selectedDate,
    required this.onDateSelected,
    required this.label,
    this.hintText,
    this.firstDate,
    this.lastDate,
    this.enabled = true,
    this.focusNode,
    this.backgroundColor,
    this.contentPadding,
    this.dateFormat,
    this.primaryColor,
  });

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final effectivePrimaryColor = primaryColor ?? theme.primaryColor;
    final effectiveDateFormat = dateFormat ?? 'yyyy년 MM월 dd일';
    
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(
          label,
          style: TextStyle(
            fontSize: 16,
            fontWeight: FontWeight.w600,
            color: theme.colorScheme.onSurface,
          ),
        ),
        const SizedBox(height: 8),
        InkWell(
          focusNode: focusNode,
          onTap: enabled ? () async {
            final DateTime? picked = await showDatePicker(
              context: context,
              initialDate: selectedDate,
              firstDate: firstDate ?? DateTime.now().subtract(const Duration(days: 365 * 10)),
              lastDate: lastDate ?? DateTime.now().add(const Duration(days: 365 * 10)),
              builder: (BuildContext context, Widget? child) {
                return Theme(
                  data: ThemeData.light().copyWith(
                    colorScheme: ColorScheme.light(
                      primary: effectivePrimaryColor,
                      onPrimary: Colors.white,
                      surface: Colors.white,
                      onSurface: Colors.black,
                    ),
                  ),
                  child: child!,
                );
              },
            );
            
            if (picked != null && picked != selectedDate) {
              onDateSelected(picked);
            }
          } : null,
          borderRadius: BorderRadius.circular(16),
          child: Container(
            padding: contentPadding ?? const EdgeInsets.all(16),
            decoration: BoxDecoration(
              color: backgroundColor ?? Colors.white,
              borderRadius: BorderRadius.circular(16),
              border: Border.all(
                color: Colors.transparent,
              ),
            ),
            child: Row(
              children: [
                Expanded(
                  child: Text(
                    DateFormat(effectiveDateFormat).format(selectedDate),
                    style: TextStyle(
                      fontSize: 16,
                      color: enabled 
                        ? theme.colorScheme.onSurface 
                        : theme.colorScheme.onSurface.withValues(alpha: 0.5),
                    ),
                  ),
                ),
                Icon(
                  Icons.calendar_today,
                  size: 20,
                  color: enabled 
                    ? theme.colorScheme.onSurface.withValues(alpha: 0.6)
                    : theme.colorScheme.onSurface.withValues(alpha: 0.3),
                ),
              ],
            ),
          ),
        ),
      ],
    );
  }
}

/// 날짜 범위 선택 필드 위젯
/// 시작일과 종료일을 선택할 수 있는 필드입니다.
class DateRangePickerField extends StatelessWidget {
  final DateTime? startDate;
  final DateTime? endDate;
  final Function(DateTime?) onStartDateSelected;
  final Function(DateTime?) onEndDateSelected;
  final String startLabel;
  final String endLabel;
  final bool enabled;
  final Color? primaryColor;

  const DateRangePickerField({
    super.key,
    required this.startDate,
    required this.endDate,
    required this.onStartDateSelected,
    required this.onEndDateSelected,
    this.startLabel = '시작일',
    this.endLabel = '종료일',
    this.enabled = true,
    this.primaryColor,
  });

  @override
  Widget build(BuildContext context) {
    return Row(
      children: [
        Expanded(
          child: _DateRangeItem(
            date: startDate,
            label: startLabel,
            enabled: enabled,
            primaryColor: primaryColor,
            onDateSelected: onStartDateSelected,
            firstDate: DateTime.now().subtract(const Duration(days: 365)),
            lastDate: endDate ?? DateTime.now().add(const Duration(days: 365 * 2)),
          ),
        ),
        const SizedBox(width: 12),
        Expanded(
          child: _DateRangeItem(
            date: endDate,
            label: endLabel,
            enabled: enabled && startDate != null,
            primaryColor: primaryColor,
            onDateSelected: onEndDateSelected,
            firstDate: startDate ?? DateTime.now(),
            lastDate: DateTime.now().add(const Duration(days: 365 * 2)),
          ),
        ),
      ],
    );
  }
}

class _DateRangeItem extends StatelessWidget {
  final DateTime? date;
  final String label;
  final bool enabled;
  final Color? primaryColor;
  final Function(DateTime?) onDateSelected;
  final DateTime firstDate;
  final DateTime lastDate;

  const _DateRangeItem({
    required this.date,
    required this.label,
    required this.enabled,
    required this.primaryColor,
    required this.onDateSelected,
    required this.firstDate,
    required this.lastDate,
  });

  @override
  Widget build(BuildContext context) {
    final theme = Theme.of(context);
    final effectivePrimaryColor = primaryColor ?? theme.primaryColor;

    return InkWell(
      onTap: enabled ? () async {
        final DateTime? picked = await showDatePicker(
          context: context,
          initialDate: date ?? DateTime.now(),
          firstDate: firstDate,
          lastDate: lastDate,
          builder: (BuildContext context, Widget? child) {
            return Theme(
              data: ThemeData.light().copyWith(
                colorScheme: ColorScheme.light(
                  primary: effectivePrimaryColor,
                  onPrimary: Colors.white,
                  surface: Colors.white,
                  onSurface: Colors.black,
                ),
              ),
              child: child!,
            );
          },
        );
        
        if (picked != null) {
          onDateSelected(picked);
        }
      } : null,
      borderRadius: BorderRadius.circular(16),
      child: Container(
        padding: const EdgeInsets.all(16),
        decoration: BoxDecoration(
          color: Colors.white,
          borderRadius: BorderRadius.circular(16),
        ),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(
              label,
              style: TextStyle(
                fontSize: 12,
                color: theme.colorScheme.onSurface.withValues(alpha: 0.6),
              ),
            ),
            const SizedBox(height: 4),
            Text(
              date != null
                  ? DateFormat('MM/dd').format(date!)
                  : '선택',
              style: TextStyle(
                fontSize: 16,
                fontWeight: FontWeight.w500,
                color: date != null
                    ? theme.colorScheme.onSurface
                    : theme.colorScheme.onSurface.withValues(alpha: 0.4),
              ),
            ),
          ],
        ),
      ),
    );
  }
}