package migration

import (
	"errors"
	"fmt"
	"io/fs"

	"github.com/golang-migrate/migrate/v4"
	migratemysql "github.com/golang-migrate/migrate/v4/database/mysql"
	"github.com/golang-migrate/migrate/v4/source/iofs"
	"gorm.io/gorm"
)

func Run(db *gorm.DB, files fs.FS) error {
	sqlDB, err := db.DB()
	if err != nil {
		return fmt.Errorf("get sql database: %w", err)
	}
	driver, err := migratemysql.WithInstance(sqlDB, &migratemysql.Config{})
	if err != nil {
		return fmt.Errorf("create migration database driver: %w", err)
	}
	source, err := iofs.New(files, "migrations")
	if err != nil {
		return fmt.Errorf("create migration source: %w", err)
	}
	m, err := migrate.NewWithInstance("iofs", source, "mysql", driver)
	if err != nil {
		return fmt.Errorf("create migrator: %w", err)
	}
	if err := m.Up(); err != nil && !errors.Is(err, migrate.ErrNoChange) {
		return fmt.Errorf("run migrations: %w", err)
	}
	return nil
}