package spec

import (
	"strings"

	"github.com/pkg/errors"
	"github.com/qri-io/jsonschema"
)

var ErrUnknownSchema = errors.New("unknown schema")

type ValidationError struct {
	keyErrors []jsonschema.KeyError
}

func (e *ValidationError) Error() string {
	var sb strings.Builder

	if _, err := sb.WriteString("validation error: "); err != nil {
		panic(errors.WithStack(err))
	}

	for i, err := range e.keyErrors {
		if i != 0 {
			if _, err := sb.WriteString(", "); err != nil {
				panic(errors.WithStack(err))
			}
		}

		if _, err := sb.WriteString(err.Error()); err != nil {
			panic(errors.WithStack(err))
		}
	}

	return sb.String()
}