package litemigrate

import (
	"context"
	"database/sql"
	"fmt"
	"github.com/Southclaws/fault"
	"io"
)

func (m *Migrator) runMigrationFile(ctx context.Context, tx *sql.Tx, filename string) error {
	f, err := m.fs.Open(filename)
	if err != nil {
		return fault.Wrap(err)
	}
	defer f.Close()

	bts, err := io.ReadAll(f)
	if err != nil {
		return fault.Wrap(err)
	}

	if _, err := tx.ExecContext(ctx, string(bts)); err != nil {
		return fault.Wrap(err)
	}
	return nil
}

func (m *Migrator) getVersion(ctx context.Context, tx *sql.Tx) (userVersion int, err error) {
	err = tx.QueryRowContext(ctx, `SELECT * FROM pragma_user_version;`).Scan(&userVersion)
	return userVersion, err
}

func (m *Migrator) setVersion(ctx context.Context, tx *sql.Tx, userVersion int) (err error) {
	_, err = tx.ExecContext(ctx, fmt.Sprintf("PRAGMA user_version = %v", userVersion))
	return err
}

func (m *Migrator) inTX(ctx context.Context, txFn func(tx *sql.Tx) error) error {
	tx, err := m.db.BeginTx(ctx, nil)
	if err != nil {
		return fault.Wrap(err)
	}

	if err := txFn(tx); err != nil {
		_ = tx.Rollback()
		return fault.Wrap(err)
	}

	return fault.Wrap(tx.Commit())
}