tercul-backend/internal/repositories/copyright_repository.go

package repositories

import (
	"context"
	"errors"
	"gorm.io/gorm"
	"tercul/internal/models"
)

// CopyrightRepository defines CRUD methods specific to Copyright.
type CopyrightRepository interface {
	BaseRepository[models.Copyright]
	// Polymorphic methods
	AttachToEntity(ctx context.Context, copyrightID uint, entityID uint, entityType string) error
	DetachFromEntity(ctx context.Context, copyrightID uint, entityID uint, entityType string) error
	GetByEntity(ctx context.Context, entityID uint, entityType string) ([]models.Copyright, error)
	GetEntitiesByCopyright(ctx context.Context, copyrightID uint) ([]models.Copyrightable, error)
	// Translation methods
	AddTranslation(ctx context.Context, translation *models.CopyrightTranslation) error
	GetTranslations(ctx context.Context, copyrightID uint) ([]models.CopyrightTranslation, error)
	GetTranslationByLanguage(ctx context.Context, copyrightID uint, languageCode string) (*models.CopyrightTranslation, error)
}

type copyrightRepository struct {
	BaseRepository[models.Copyright]
	db *gorm.DB
}

// NewCopyrightRepository creates a new CopyrightRepository.
func NewCopyrightRepository(db *gorm.DB) CopyrightRepository {
	return &copyrightRepository{
		BaseRepository: NewBaseRepositoryImpl[models.Copyright](db),
		db:             db,
	}
}

// AttachToEntity attaches a copyright to any entity type
func (r *copyrightRepository) AttachToEntity(ctx context.Context, copyrightID uint, entityID uint, entityType string) error {
	copyrightable := models.Copyrightable{
		CopyrightID:       copyrightID,
		CopyrightableID:   entityID,
		CopyrightableType: entityType,
	}
	return r.db.WithContext(ctx).Create(&copyrightable).Error
}

// DetachFromEntity removes a copyright from an entity
func (r *copyrightRepository) DetachFromEntity(ctx context.Context, copyrightID uint, entityID uint, entityType string) error {
	return r.db.WithContext(ctx).Where("copyright_id = ? AND copyrightable_id = ? AND copyrightable_type = ?",
		copyrightID, entityID, entityType).Delete(&models.Copyrightable{}).Error
}

// GetByEntity gets all copyrights for a specific entity
func (r *copyrightRepository) GetByEntity(ctx context.Context, entityID uint, entityType string) ([]models.Copyright, error) {
	var copyrights []models.Copyright
	err := r.db.WithContext(ctx).Joins("JOIN copyrightables ON copyrightables.copyright_id = copyrights.id").
		Where("copyrightables.copyrightable_id = ? AND copyrightables.copyrightable_type = ?", entityID, entityType).
		Preload("Translations").
		Find(&copyrights).Error
	return copyrights, err
}

// GetEntitiesByCopyright gets all entities that have a specific copyright
func (r *copyrightRepository) GetEntitiesByCopyright(ctx context.Context, copyrightID uint) ([]models.Copyrightable, error) {
	var copyrightables []models.Copyrightable
	err := r.db.WithContext(ctx).Where("copyright_id = ?", copyrightID).Find(&copyrightables).Error
	return copyrightables, err
}

// AddTranslation adds a translation to a copyright
func (r *copyrightRepository) AddTranslation(ctx context.Context, translation *models.CopyrightTranslation) error {
	return r.db.WithContext(ctx).Create(translation).Error
}

// GetTranslations gets all translations for a copyright
func (r *copyrightRepository) GetTranslations(ctx context.Context, copyrightID uint) ([]models.CopyrightTranslation, error) {
	var translations []models.CopyrightTranslation
	err := r.db.WithContext(ctx).Where("copyright_id = ?", copyrightID).Find(&translations).Error
	return translations, err
}

// GetTranslationByLanguage gets a specific translation by language code
func (r *copyrightRepository) GetTranslationByLanguage(ctx context.Context, copyrightID uint, languageCode string) (*models.CopyrightTranslation, error) {
	var translation models.CopyrightTranslation
	err := r.db.WithContext(ctx).Where("copyright_id = ? AND language_code = ?", copyrightID, languageCode).First(&translation).Error
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return nil, ErrEntityNotFound
		}
		return nil, err
	}
	return &translation, nil
}