package docker

import "strings"

// Adapts some of the logic from the actual Docker library's image parsing
// routines:
// https://github.com/docker/distribution/blob/release/2.7/reference/normalize.go
func ParseImage(image string) (string, string) {
	domain := ""
	remainder := ""

	i := strings.IndexRune(image, '/')

	if i == -1 || (!strings.ContainsAny(image[:i], ".:") && image[:i] != "localhost") {
		remainder = image
	} else {
		domain, remainder = image[:i], image[i+1:]
	}

	imageName := ""
	imageVersion := "unknown"

	i = strings.LastIndex(remainder, ":")
	if i > -1 {
		imageVersion = remainder[i+1:]
		imageName = remainder[:i]
	} else {
		imageName = remainder
	}

	if domain != "" {
		imageName = domain + "/" + imageName
	}

	return imageName, imageVersion
}