backend/cloudprint-backend/internal/repository/admin_repository.go

package repository

import (
	"context"
	"errors"

	"github.com/cloudprint/cloudprint-backend/internal/model"
	"gorm.io/gorm"
)

type AdminRepository struct {
	db *gorm.DB
}

func NewAdminRepository(db *gorm.DB) *AdminRepository {
	return &AdminRepository{db: db}
}

func (r *AdminRepository) Create(ctx context.Context, admin *model.Admin) error {
	return r.db.WithContext(ctx).Create(admin).Error
}

func (r *AdminRepository) GetByID(ctx context.Context, id int32) (*model.Admin, error) {
	var admin model.Admin
	err := r.db.WithContext(ctx).First(&admin, id).Error
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return nil, nil
		}
		return nil, err
	}
	return &admin, nil
}

func (r *AdminRepository) GetByUsername(ctx context.Context, username string) (*model.Admin, error) {
	var admin model.Admin
	err := r.db.WithContext(ctx).Where("username = ?", username).First(&admin).Error
	if err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return nil, nil
		}
		return nil, err
	}
	return &admin, nil
}

func (r *AdminRepository) Update(ctx context.Context, admin *model.Admin) error {
	return r.db.WithContext(ctx).Save(admin).Error
}

func (r *AdminRepository) Delete(ctx context.Context, id int32) error {
	return r.db.WithContext(ctx).Delete(&model.Admin{}, id).Error
}

func (r *AdminRepository) List(ctx context.Context, page, pageSize int) ([]model.Admin, int64, error) {
	var admins []model.Admin
	var total int64

	if err := r.db.WithContext(ctx).Model(&model.Admin{}).Count(&total).Error; err != nil {
		return nil, 0, err
	}

	offset := (page - 1) * pageSize
	if err := r.db.WithContext(ctx).Offset(offset).Limit(pageSize).Find(&admins).Error; err != nil {
		return nil, 0, err
	}

	return admins, total, nil
}