school-attendance/lib/function/profile_shop_controller.dart

// 🛍️ 프로필 꾸미기 상점 기능(서버 통신/상태) 담당 컨트롤러.
// UI는 lib/ui/profile_customize_screen.dart가 담당한다.
import 'dart:convert';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart' show Color;
import 'package:http/http.dart' as http;
import '../config.dart';

class ShopTemplate {
  final int id;
  final String category;
  final String name;
  final int price;
  final Color primaryColor;
  final Color secondaryColor;
  final bool owned;
  final bool equipped;

  ShopTemplate({
    required this.id,
    required this.category,
    required this.name,
    required this.price,
    required this.primaryColor,
    required this.secondaryColor,
    required this.owned,
    required this.equipped,
  });

  factory ShopTemplate.fromJson(Map<String, dynamic> json) {
    return ShopTemplate(
      id: json['id'] as int,
      category: json['category'] as String,
      name: json['name'] as String,
      price: json['price'] as int,
      primaryColor: _parseColor(json['primaryColor'] as String),
      secondaryColor: _parseColor(json['secondaryColor'] as String),
      owned: json['owned'] == true,
      equipped: json['equipped'] == true,
    );
  }
}

Color _parseColor(String hex) {
  return Color(int.parse(hex.substring(2), radix: 16));
}

class ProfileShopController extends ChangeNotifier {
  bool _isLoading = false;
  bool get isLoading => _isLoading;

  int cashBalance = 0;
  List<ShopTemplate> templates = [];

  void _safeNotify() {
    if (hasListeners) notifyListeners();
  }

  Future<void> loadCatalog(String studentId) async {
    _isLoading = true;
    _safeNotify();
    try {
      final url = Uri.parse(
        '$baseUrl/api/shop/catalog?studentId=${Uri.encodeComponent(studentId)}',
      );
      final response = await http.get(url);
      if (response.statusCode == 200) {
        final data = jsonDecode(response.body);
        cashBalance = (data['cashBalance'] as num?)?.toInt() ?? 0;
        templates = ((data['templates'] as List?) ?? [])
            .map((t) => ShopTemplate.fromJson(t as Map<String, dynamic>))
            .toList();
      }
    } catch (_) {
      // 네트워크 에러여도 화면은 빈 상태로라도 그려지게 조용히 넘어간다.
    } finally {
      _isLoading = false;
      _safeNotify();
    }
  }

  Future<(bool success, String message)> purchase(
    String studentId,
    int templateId,
  ) async {
    try {
      final url = Uri.parse('$baseUrl/api/shop/purchase');
      final response = await http.post(
        url,
        headers: {'Content-Type': 'application/json'},
        body: jsonEncode({'studentId': studentId, 'templateId': templateId}),
      );
      final data = jsonDecode(response.body);
      final success = data['status'] == 'success';
      if (success) {
        await loadCatalog(studentId);
      }
      return (success, '${data['message'] ?? (success ? '구매 완료!' : '구매 실패')}');
    } catch (e) {
      return (false, '서버와 연결할 수 없습니다. (네트워크 에러)');
    }
  }

  Future<(bool success, String message)> equip(
    String studentId,
    int? templateId,
  ) async {
    try {
      final url = Uri.parse('$baseUrl/api/shop/equip');
      final response = await http.post(
        url,
        headers: {'Content-Type': 'application/json'},
        body: jsonEncode({'studentId': studentId, 'templateId': templateId}),
      );
      final data = jsonDecode(response.body);
      final success = data['status'] == 'success';
      if (success) {
        await loadCatalog(studentId);
      }
      return (success, '${data['message'] ?? (success ? '장착 완료' : '장착 실패')}');
    } catch (e) {
      return (false, '서버와 연결할 수 없습니다. (네트워크 에러)');
    }
  }

  /// 🏠 메인 대시보드 프로필 카드 렌더링 전용 - 상점 화면을 열지 않고도
  /// 현재 장착 중인 테마 색상만 가볍게 조회한다.
  static Future<(Color? primary, Color? secondary)> fetchEquippedColors(
    String studentId,
  ) async {
    try {
      final url = Uri.parse(
        '$baseUrl/api/shop/equipped?studentId=${Uri.encodeComponent(studentId)}',
      );
      final response = await http.get(url);
      if (response.statusCode == 200) {
        final data = jsonDecode(response.body);
        if (data['equipped'] == true) {
          return (
            _parseColor(data['primaryColor'] as String),
            _parseColor(data['secondaryColor'] as String),
          );
        }
      }
    } catch (_) {
      // 실패하면 그냥 기본 모습으로 보여준다.
    }
    return (null, null);
  }
}