Initial commit: dating app backend (Go/Gin/GORM/Postgres)

Phone+OTP auth, staged onboarding, admin approval workflow, and a
full discovery/swipe/match/chat system with photo upload and
approximate distance (haversine) based on user location.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

internal/service/profile_service.go

@@ -0,0 +1,86 @@
+package service
+
+import (
+	"errors"
+
+	"dating-app/internal/models"
+	"dating-app/internal/repository"
+)
+
+const MaxPhotosPerUser = 6
+
+var (
+	ErrTooManyPhotos = errors.New("حداکثر تعداد عکس مجاز رو داری")
+	ErrPhotoNotOwned = errors.New("این عکس متعلق به تو نیست")
+	ErrInvalidImage  = errors.New("فرمت فایل باید jpg، png یا webp باشه")
+	ErrImageTooLarge = errors.New("حجم عکس نباید بیشتر از ۵ مگابایت باشه")
+)
+
+const MaxPhotoSizeBytes = 5 * 1024 * 1024
+
+type ProfileService struct {
+	photoRepo *repository.PhotoRepository
+	userRepo  *repository.UserRepository
+	storage   PhotoStorage
+}
+
+func NewProfileService(photoRepo *repository.PhotoRepository, userRepo *repository.UserRepository, storage PhotoStorage) *ProfileService {
+	return &ProfileService{photoRepo: photoRepo, userRepo: userRepo, storage: storage}
+}
+
+var allowedImageExts = map[string]bool{
+	".jpg": true, ".jpeg": true, ".png": true, ".webp": true,
+}
+
+func (s *ProfileService) UploadPhoto(userID uint, ext string, data []byte) (*models.Photo, error) {
+	if !allowedImageExts[ext] {
+		return nil, ErrInvalidImage
+	}
+	if len(data) > MaxPhotoSizeBytes {
+		return nil, ErrImageTooLarge
+	}
+
+	count, err := s.photoRepo.CountByUser(userID)
+	if err != nil {
+		return nil, err
+	}
+	if count >= MaxPhotosPerUser {
+		return nil, ErrTooManyPhotos
+	}
+
+	url, err := s.storage.Save(userID, ext, data)
+	if err != nil {
+		return nil, err
+	}
+
+	photo := &models.Photo{UserID: userID, URL: url, SortOrder: int(count)}
+	if err := s.photoRepo.Create(photo); err != nil {
+		return nil, err
+	}
+	return photo, nil
+}
+
+func (s *ProfileService) DeletePhoto(userID, photoID uint) error {
+	photo, err := s.photoRepo.FindByID(photoID)
+	if err != nil {
+		return err
+	}
+	if photo.UserID != userID {
+		return ErrPhotoNotOwned
+	}
+	if err := s.photoRepo.Delete(photoID); err != nil {
+		return err
+	}
+	return s.storage.Delete(photo.URL)
+}
+
+func (s *ProfileService) ListPhotos(userID uint) ([]models.Photo, error) {
+	return s.photoRepo.ListByUser(userID)
+}
+
+func (s *ProfileService) UpdateLocation(user *models.User, lat, lng float64) error {
+	return s.userRepo.UpdateFields(user, map[string]interface{}{
+		"latitude":  lat,
+		"longitude": lng,
+	})
+}