package db

import (
	"embed"
	"errors"
)

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

// MigrationsFS exposes the embedded migration files. The concrete migration
// runner (goose) will be wired in M2 when Postgres work begins; this package
// intentionally keeps the embed + a placeholder surface so the file layout
// and `go:embed` directive are established from day one.
func MigrationsFS() embed.FS {
	return migrationsFS
}

// ErrNotConfigured is returned by Migrate until the real runner is wired.
var ErrNotConfigured = errors.New("db: migrations not yet configured (wired in M2)")

// Migrate is a placeholder. It validates that the embedded migrations load
// and then returns ErrNotConfigured so callers can detect the stub.
func Migrate() error {
	entries, err := migrationsFS.ReadDir("migrations")
	if err != nil {
		return err
	}
	if len(entries) == 0 {
		return errors.New("db: no migration files found")
	}
	return ErrNotConfigured
}