package migration

import "gorm.io/gorm"

// CreateMissingTables creates only schemas that are absent. Existing tables
// are intentionally left untouched: GORM's MySQL column diff path can panic
// when older servers return incomplete information_schema metadata, and this
// project does not support implicit legacy-schema upgrades through AutoMigrate.
func CreateMissingTables(db *gorm.DB, models ...any) error {
	missing := make([]any, 0, len(models))
	for _, model := range models {
		if model != nil && !db.Migrator().HasTable(model) {
			missing = append(missing, model)
		}
	}
	if len(missing) == 0 {
		return nil
	}
	return db.Migrator().CreateTable(missing...)
}