package metadata

import (
	"strings"

	"forge.cadoles.com/arcad/edge/pkg/app"
	"github.com/pkg/errors"
)

type NamedPath string

const (
	NamedPathAdmin NamedPath = "admin"
	NamedPathIcon  NamedPath = "icon"
)

func WithNamedPathsValidator(names ...NamedPath) app.MetadataValidator {
	set := map[NamedPath]struct{}{}
	for _, n := range names {
		set[n] = struct{}{}
	}

	return func(metadata map[string]any) (bool, error) {
		rawPaths, exists := metadata["paths"]
		if !exists {
			return true, nil
		}

		paths, ok := rawPaths.(map[any]any)
		if !ok {
			return false, errors.Errorf("metadata['paths']: unexpected named path value type '%T'", rawPaths)
		}

		for n, p := range paths {
			name, ok := n.(string)
			if !ok {
				return false, errors.Errorf("metadata['paths']: unexpected named path type '%T'", n)
			}

			if _, exists := set[NamedPath(name)]; !exists {
				return false, errors.Errorf("metadata['paths']: unexpected named path '%s'", name)
			}

			path, ok := p.(string)
			if !ok {
				return false, errors.Errorf("metadata['paths']['%s']: unexpected named path value type '%T'", name, path)
			}

			if !strings.HasPrefix(path, "/") {
				return false, errors.Errorf("metadata['paths']['%s']: named path value should start with a '/'", name)
			}
		}

		return true, nil
	}
}