package objectstorage

import (
	"net/url"
	"strings"
)

func objectKeyFromPublicURL(publicBase string, value string) (string, bool) {
	value = strings.TrimSpace(value)
	publicBase = strings.TrimRight(strings.TrimSpace(publicBase), "/")
	if value == "" || publicBase == "" {
		return "", false
	}

	if strings.HasPrefix(value, publicBase+"/") {
		return unescapeObjectKey(strings.TrimPrefix(strings.Split(value, "?")[0], publicBase+"/"))
	}

	parsedValue, err := url.Parse(value)
	if err != nil {
		return "", false
	}
	parsedBase, err := url.Parse(publicBase)
	if err != nil {
		return "", false
	}
	basePath := strings.TrimRight(parsedBase.EscapedPath(), "/")
	valuePath := parsedValue.EscapedPath()
	if basePath == "" || !strings.HasPrefix(valuePath, basePath+"/") {
		return "", false
	}
	return unescapeObjectKey(strings.TrimPrefix(valuePath, basePath+"/"))
}

func unescapeObjectKey(value string) (string, bool) {
	value = strings.TrimLeft(strings.TrimSpace(value), "/")
	if value == "" {
		return "", false
	}
	objectKey, err := url.PathUnescape(value)
	if err != nil {
		return "", false
	}
	return objectKey, objectKey != ""
}