import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import '../../controllers/detail_screen_controller.dart';
import '../../providers/category_provider.dart';
import '../common/form_fields/base_text_field.dart';
import '../common/form_fields/currency_input_field.dart';
import '../common/form_fields/date_picker_field.dart';

/// 상세 화면 폼 섹션
/// 구독 정보를 편집할 수 있는 폼 필드들을 포함합니다.
class DetailFormSection extends StatelessWidget {
  final DetailScreenController controller;
  final Animation<double> fadeAnimation;
  final Animation<Offset> slideAnimation;

  const DetailFormSection({
    super.key,
    required this.controller,
    required this.fadeAnimation,
    required this.slideAnimation,
  });

  @override
  Widget build(BuildContext context) {
    final baseColor = controller.getCardColor();

    return FadeTransition(
      opacity: fadeAnimation,
      child: SlideTransition(
        position: Tween<Offset>(
          begin: const Offset(0.0, 0.6),
          end: Offset.zero,
        ).animate(CurvedAnimation(
          parent: controller.animationController!,
          curve: const Interval(0.3, 1.0, curve: Curves.easeOutCubic),
        )),
        child: Card(
          elevation: 1,
          shadowColor: Colors.black12,
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.circular(20),
          ),
          child: Padding(
            padding: const EdgeInsets.all(24),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              mainAxisSize: MainAxisSize.min,
              children: [
                // 서비스명 필드
                BaseTextField(
                  controller: controller.serviceNameController,
                  focusNode: controller.serviceNameFocus,
                  label: '서비스명',
                  hintText: '예: Netflix, Spotify',
                  textInputAction: TextInputAction.next,
                  onEditingComplete: () {
                    controller.monthlyCostFocus.requestFocus();
                  },
                ),
                const SizedBox(height: 20),

                // 월 지출 및 통화 선택
                Row(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    Expanded(
                      flex: 2,
                      child: CurrencyInputField(
                        controller: controller.monthlyCostController,
                        currency: controller.currency,
                        label: '월 지출',
                        focusNode: controller.monthlyCostFocus,
                        textInputAction: TextInputAction.next,
                        onEditingComplete: () {
                          controller.billingCycleFocus.requestFocus();
                        },
                      ),
                    ),
                    const SizedBox(width: 12),
                    Expanded(
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          const Text(
                            '통화',
                            style: TextStyle(
                              fontSize: 16,
                              fontWeight: FontWeight.w600,
                            ),
                          ),
                          const SizedBox(height: 8),
                          _CurrencySelector(
                            currency: controller.currency,
                            onChanged: (value) {
                              controller.currency = value;
                              // 통화 변경시 금액 포맷 업데이트
                              if (value == 'KRW') {
                                final amount = double.tryParse(
                                  controller.monthlyCostController.text.replaceAll(',', '')
                                );
                                if (amount != null) {
                                  controller.monthlyCostController.text = 
                                      amount.toInt().toString();
                                }
                              }
                            },
                          ),
                        ],
                      ),
                    ),
                  ],
                ),
                const SizedBox(height: 20),

                // 결제 주기
                Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    const Text(
                      '결제 주기',
                      style: TextStyle(
                        fontSize: 16,
                        fontWeight: FontWeight.w600,
                      ),
                    ),
                    const SizedBox(height: 8),
                    _BillingCycleSelector(
                      billingCycle: controller.billingCycle,
                      baseColor: baseColor,
                      onChanged: (value) {
                        controller.billingCycle = value;
                      },
                    ),
                  ],
                ),
                const SizedBox(height: 20),

                // 다음 결제일
                DatePickerField(
                  selectedDate: controller.nextBillingDate,
                  onDateSelected: (date) {
                    controller.nextBillingDate = date;
                  },
                  label: '다음 결제일',
                  firstDate: DateTime.now(),
                  lastDate: DateTime.now().add(const Duration(days: 365 * 2)),
                  primaryColor: baseColor,
                ),
                const SizedBox(height: 20),

                // 카테고리 선택
                Consumer<CategoryProvider>(
                  builder: (context, categoryProvider, child) {
                    return Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        const Text(
                          '카테고리',
                          style: TextStyle(
                            fontSize: 16,
                            fontWeight: FontWeight.w600,
                          ),
                        ),
                        const SizedBox(height: 8),
                        _CategorySelector(
                          categories: categoryProvider.categories,
                          selectedCategoryId: controller.selectedCategoryId,
                          baseColor: baseColor,
                          onChanged: (categoryId) {
                            controller.selectedCategoryId = categoryId;
                          },
                        ),
                      ],
                    );
                  },
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}

/// 통화 선택기
class _CurrencySelector extends StatelessWidget {
  final String currency;
  final ValueChanged<String> onChanged;

  const _CurrencySelector({
    required this.currency,
    required this.onChanged,
  });

  @override
  Widget build(BuildContext context) {
    return Row(
      children: [
        _CurrencyOption(
          label: '₩',
          value: 'KRW',
          isSelected: currency == 'KRW',
          onTap: () => onChanged('KRW'),
        ),
        const SizedBox(width: 8),
        _CurrencyOption(
          label: '\$',
          value: 'USD',
          isSelected: currency == 'USD',
          onTap: () => onChanged('USD'),
        ),
      ],
    );
  }
}

/// 통화 옵션
class _CurrencyOption extends StatelessWidget {
  final String label;
  final String value;
  final bool isSelected;
  final VoidCallback onTap;

  const _CurrencyOption({
    required this.label,
    required this.value,
    required this.isSelected,
    required this.onTap,
  });

  @override
  Widget build(BuildContext context) {
    return Expanded(
      child: InkWell(
        onTap: onTap,
        borderRadius: BorderRadius.circular(12),
        child: Container(
          padding: const EdgeInsets.symmetric(vertical: 12),
          decoration: BoxDecoration(
            color: isSelected 
                ? Theme.of(context).primaryColor 
                : Colors.grey.withOpacity(0.1),
            borderRadius: BorderRadius.circular(12),
          ),
          child: Center(
            child: Text(
              label,
              style: TextStyle(
                fontSize: 18,
                fontWeight: FontWeight.w600,
                color: isSelected ? Colors.white : Colors.grey[600],
              ),
            ),
          ),
        ),
      ),
    );
  }
}

/// 결제 주기 선택기
class _BillingCycleSelector extends StatelessWidget {
  final String billingCycle;
  final Color baseColor;
  final ValueChanged<String> onChanged;

  const _BillingCycleSelector({
    required this.billingCycle,
    required this.baseColor,
    required this.onChanged,
  });

  @override
  Widget build(BuildContext context) {
    final cycles = ['매월', '분기별', '반기별', '매년'];
    
    return SingleChildScrollView(
      scrollDirection: Axis.horizontal,
      child: Row(
        children: cycles.map((cycle) {
          final isSelected = billingCycle == cycle;
          return Padding(
            padding: const EdgeInsets.only(right: 8),
            child: InkWell(
              onTap: () => onChanged(cycle),
              borderRadius: BorderRadius.circular(12),
              child: Container(
                padding: const EdgeInsets.symmetric(
                  horizontal: 20,
                  vertical: 12,
                ),
                decoration: BoxDecoration(
                  color: isSelected ? baseColor : Colors.grey.withOpacity(0.1),
                  borderRadius: BorderRadius.circular(12),
                ),
                child: Text(
                  cycle,
                  style: TextStyle(
                    fontSize: 14,
                    fontWeight: FontWeight.w500,
                    color: isSelected ? Colors.white : Colors.grey[700],
                  ),
                ),
              ),
            ),
          );
        }).toList(),
      ),
    );
  }
}

/// 카테고리 선택기
class _CategorySelector extends StatelessWidget {
  final List<dynamic> categories;
  final String? selectedCategoryId;
  final Color baseColor;
  final ValueChanged<String?> onChanged;

  const _CategorySelector({
    required this.categories,
    required this.selectedCategoryId,
    required this.baseColor,
    required this.onChanged,
  });

  @override
  Widget build(BuildContext context) {
    return Wrap(
      spacing: 8,
      runSpacing: 8,
      children: categories.map((category) {
        final isSelected = selectedCategoryId == category.id;
        return InkWell(
          onTap: () => onChanged(category.id),
          borderRadius: BorderRadius.circular(12),
          child: Container(
            padding: const EdgeInsets.symmetric(
              horizontal: 16,
              vertical: 10,
            ),
            decoration: BoxDecoration(
              color: isSelected ? baseColor : Colors.grey.withOpacity(0.1),
              borderRadius: BorderRadius.circular(12),
            ),
            child: Row(
              mainAxisSize: MainAxisSize.min,
              children: [
                Text(
                  category.emoji,
                  style: const TextStyle(fontSize: 16),
                ),
                const SizedBox(width: 6),
                Text(
                  category.name,
                  style: TextStyle(
                    fontSize: 14,
                    fontWeight: FontWeight.w500,
                    color: isSelected ? Colors.white : Colors.grey[700],
                  ),
                ),
              ],
            ),
          ),
        );
      }).toList(),
    );
  }
}