package db

import (
	"database/sql"
	"embed"
	"errors"
	"fmt"

	"github.com/golang-migrate/migrate/v4"
	"github.com/golang-migrate/migrate/v4/database/postgres"
	"github.com/golang-migrate/migrate/v4/source/iofs"
)

//go:embed migrations/*.sql
var migrationsFS embed.FS

func Migrate(sqlDB *sql.DB) error {
	driver, err := postgres.WithInstance(sqlDB, &postgres.Config{})
	if err != nil {
		return fmt.Errorf("db: creating migration driver: %w", err)
	}

	source, err := iofs.New(migrationsFS, "migrations")
	if err != nil {
		return fmt.Errorf("db: loading embedded migrations: %w", err)
	}

	m, err := migrate.NewWithInstance("iofs", source, "postgres", driver)
	if err != nil {
		return fmt.Errorf("db: initializing migrator: %w", err)
	}

	if err := m.Up(); err != nil && !errors.Is(err, migrate.ErrNoChange) {
		return fmt.Errorf("db: applying migrations: %w", err)
	}

	return nil
}