package compat

import (
	dockerList "github.com/distribution/distribution/v3/manifest/manifestlist"
	docker "github.com/distribution/distribution/v3/manifest/schema2"
	v1 "github.com/opencontainers/image-spec/specs-go/v1"

	"zotregistry.dev/zot/errors"
)

// MediaCompatibility determines non-OCI media-compatilibility.
type MediaCompatibility string

const (
	DockerManifestV2SchemaV2 = "docker2s2"
)

// docker

func CompatibleManifestMediaTypes() []string {
	return []string{docker.MediaTypeManifest}
}

func IsCompatibleManifestMediaType(mediatype string) bool {
	for _, mt := range CompatibleManifestMediaTypes() {
		if mt == mediatype {
			return true
		}
	}

	return false
}

func CompatibleManifestListMediaTypes() []string {
	return []string{dockerList.MediaTypeManifestList}
}

func IsCompatibleManifestListMediaType(mediatype string) bool {
	for _, mt := range CompatibleManifestListMediaTypes() {
		if mt == mediatype {
			return true
		}
	}

	return false
}

func Validate(body []byte, mediaType string) ([]v1.Descriptor, error) {
	switch mediaType {
	case docker.MediaTypeManifest:
		var desm docker.DeserializedManifest

		if err := desm.UnmarshalJSON(body); err != nil {
			return nil, err
		}

		return desm.References(), nil
	case dockerList.MediaTypeManifestList:
		var desm dockerList.DeserializedManifestList

		if err := desm.UnmarshalJSON(body); err != nil {
			return nil, err
		}

		return desm.References(), nil
	}

	return nil, errors.ErrMediaTypeNotSupported
}