package stepper

import (
	"context"
)

const (
	Error     Status = iota
	Completed Status = iota
	Canceled  Status = iota
)

var (
	ErrUnsupportedState = "unsupported state"
)

type Status int

type Step func(ctx context.Context, cancelFunc context.CancelFunc, state interface{}) error

func Run(ctx context.Context, state interface{}, steps ...Step) (Status, error) {

	ctx, cancel := context.WithCancel(ctx)
	defer cancel()

	for _, s := range steps {
		select {
		case <-ctx.Done():
			return Canceled, nil
		default:
			err := s(ctx, cancel, state)
			if err != nil {
				return Error, err
			}
		}
	}

	return Completed, nil

}