package gallery

import (
	"os"
	"strings"
)

const defaultHeroRel = "connectionmachine/20220723_231556.jpg"

// HeroRelPath returns the configured hero image path relative to images/.
func HeroRelPath() string {
	if p := strings.TrimSpace(os.Getenv("HERO_IMAGE")); p != "" {
		return filepathToSlash(p)
	}
	return defaultHeroRel
}

// SelectHero picks the homepage hero from the gallery list.
func SelectHero(images []Image) (Image, bool) {
	want := HeroRelPath()
	for _, img := range images {
		if img.RelPath == want {
			return img, true
		}
	}
	if len(images) > 0 {
		return images[0], true
	}
	return Image{}, false
}

func filepathToSlash(p string) string {
	return strings.ReplaceAll(p, "\\", "/")
}