package bucket

import (
	"errors"
	"fmt"
	"net/url"
	"strings"
)

type Photo string

const photoPrefix = "photo/"
const photoMetadataPrefix = "photometadata/"

var ErrorInvalidPhoto = errors.New("invalid photo")

func (p Photo) Validate() error {
	if !strings.HasPrefix(string(p), photoPrefix) {
		return fmt.Errorf("%w: %v", ErrorInvalidPhoto, p)
	}
	if strings.HasSuffix(string(p), "/") {
		return fmt.Errorf("%w: %v", ErrorInvalidPhoto, p)
	}
	return nil
}

func (p Photo) String() string {
	return string(p)
}

func (p Photo) Path() *url.URL {
	return &url.URL{
		Path: string(p),
	}
}

type PhotoMetadata string

func (p Photo) Metadata(name string) PhotoMetadata {
	objectBase := strings.Replace(string(p), photoPrefix, photoMetadataPrefix, 1)
	return PhotoMetadata(objectBase + "/" + name)
}

func (m PhotoMetadata) String() string {
	return string(m)
}

func (m PhotoMetadata) Path() *url.URL {
	return &url.URL{
		Path: string(m),
	}
}

func (p Photo) MetadataSize() PhotoMetadata {
	return p.Metadata("size")
}
func (p Photo) MetadataDate() PhotoMetadata {
	return p.Metadata("date")
}
func (p Photo) MetadataTitle() PhotoMetadata {
	return p.Metadata("title")
}
func (p Photo) MetadataTags() PhotoMetadata {
	return p.Metadata("tags")
}