import 'package:flutter/material.dart';
import 'package:intl/intl.dart';
import '../../../theme/app_colors.dart';
import '../../../l10n/app_localizations.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 localizations = AppLocalizations.of(context);
    final effectiveDateFormat = dateFormat ?? localizations.dateFormatFull;
    final locale = Localizations.localeOf(context);

    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(
          label,
          style: TextStyle(
            fontSize: 16,
            fontWeight: FontWeight.w600,
            color: AppColors.darkNavy,
          ),
        ),
        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 ?? AppColors.surfaceColorAlt,
              borderRadius: BorderRadius.circular(16),
              border: Border.all(
                color: AppColors.borderColor.withValues(alpha: 0.7),
                width: 1.5,
              ),
            ),
            child: Row(
              children: [
                Expanded(
                  child: Text(
                    DateFormat(effectiveDateFormat, locale.toString())
                        .format(selectedDate),
                    style: TextStyle(
                      fontSize: 16,
                      color:
                          enabled ? AppColors.textPrimary : AppColors.textMuted,
                    ),
                  ),
                ),
                Icon(
                  Icons.calendar_today,
                  size: 20,
                  color: enabled ? AppColors.navyGray : AppColors.textMuted,
                ),
              ],
            ),
          ),
        ),
      ],
    );
  }
}

/// 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: AppColors.surfaceColorAlt,
          borderRadius: BorderRadius.circular(16),
          border: Border.all(
            color: AppColors.borderColor.withValues(alpha: 0.7),
            width: 1.5,
          ),
        ),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(
              label,
              style: TextStyle(
                fontSize: 12,
                color: AppColors.textSecondary,
              ),
            ),
            const SizedBox(height: 4),
            Text(
              date != null
                  ? DateFormat(AppLocalizations.of(context).dateFormatShort)
                      .format(date!)
                  : AppLocalizations.of(context).dateSelect,
              style: TextStyle(
                fontSize: 16,
                fontWeight: FontWeight.w500,
                color:
                    date != null ? AppColors.textPrimary : AppColors.textMuted,
              ),
            ),
          ],
        ),
      ),
    );
  }
}