// Package migration owns the application database migration runner. Each data
// module declares its own steps; the root data package only orders and runs
// them.
package migration

import (
	"fmt"

	"github.com/go-gormigrate/gormigrate/v2"
	"gorm.io/gorm"
)

const TableName = "sys_schema_migrations"

type Step struct {
	ID      string
	Migrate func(*gorm.DB) error
}

func Run(db *gorm.DB, steps []Step) error {
	if db == nil {
		return fmt.Errorf("database is nil")
	}
	migrations := make([]*gormigrate.Migration, 0, len(steps))
	for _, step := range steps {
		current := step
		migrations = append(migrations, &gormigrate.Migration{ID: current.ID, Migrate: current.Migrate})
	}
	manager := gormigrate.New(db, &gormigrate.Options{
		TableName:                 TableName,
		IDColumnName:              "id",
		IDColumnSize:              255,
		UseTransaction:            false,
		ValidateUnknownMigrations: true,
	}, migrations)
	if err := manager.Migrate(); err != nil {
		return fmt.Errorf("apply database migrations: %w", err)
	}
	return nil
}