package sqaffold

import (
	"code.aneur.in/go/version"
)

func (s *Scaffold) Migrate() error {
	if err := s.migrateApp("sqaffold", s.migration()); err != nil {
		return Err(err)
	}

	for appName, migration := range s.apps {
		if err := s.migrateApp(appName, migration); err != nil {
			return Err(err)
		}
	}

	return nil
}

func (s *Scaffold) migrateApp(appName string, migration version.Migration) error {
	currentVersion, err := s.GetVersion(appName)
	if err != nil {
		return err
	}

	required, err := migration.Match(&version.Constraint{Gt: currentVersion})
	if err != nil {
		return err
	}

	versions, _ := required.Versions()
	if len(versions) == 0 {
		return nil
	}

	var updateVersion *version.Version
	err = migration.Up(func(applied, next *version.Version) {
		updateVersion = applied
	})

	if updateVersion != nil {
		s.setVersion(appName, updateVersion)
	}

	return err
}