gochat/backend/internal/repository/attachment_repo.go

package repository

import (
	"context"

	"gorm.io/gorm"

	"github.com/gochat/gochat/internal/model"
)

// AttachmentRepo implements GORM repository for Attachment.
// Reference: Chatwoot app/models/attachment.rb
type AttachmentRepo struct {
	db *gorm.DB
}

// NewAttachmentRepo creates a new Attachment repository.
func NewAttachmentRepo(db *gorm.DB) *AttachmentRepo {
	return &AttachmentRepo{db: db}
}

// FindByID retrieves an attachment by primary key.
func (r *AttachmentRepo) FindByID(ctx context.Context, id uint) (*model.Attachment, error) {
	var attachment model.Attachment
	err := r.db.WithContext(ctx).First(&attachment, id).Error
	if err != nil {
		return nil, err
	}
	return &attachment, nil
}

// FindByMessage retrieves all attachments for a message.
func (r *AttachmentRepo) FindByMessage(ctx context.Context, messageID uint) ([]model.Attachment, error) {
	var attachments []model.Attachment
	err := r.db.WithContext(ctx).Where("message_id = ?", messageID).
		Order("id ASC").Find(&attachments).Error
	return attachments, err
}

// Create inserts a new attachment.
func (r *AttachmentRepo) Create(ctx context.Context, attachment *model.Attachment) error {
	return r.db.WithContext(ctx).Create(attachment).Error
}

// Update modifies an existing attachment.
func (r *AttachmentRepo) Update(ctx context.Context, attachment *model.Attachment) error {
	return r.db.WithContext(ctx).Save(attachment).Error
}

// Delete soft-deletes an attachment.
func (r *AttachmentRepo) Delete(ctx context.Context, id uint) error {
	return r.db.WithContext(ctx).Delete(&model.Attachment{}, id).Error
}

// DeleteByMessage soft-deletes all attachments for a message.
func (r *AttachmentRepo) DeleteByMessage(ctx context.Context, messageID uint) error {
	return r.db.WithContext(ctx).Where("message_id = ?", messageID).Delete(&model.Attachment{}).Error
}