package main

import (
	"log"
	"os"
	"path"
	"strings"

	"github.com/go-git/go-git/v5/plumbing"
)

type Img struct {
	Path string
	Alt  string
	Size int64
	Typ  string
}

var ImgTypes = map[string]string{
	".jxl":  "image/jxl",
	".webp": "image/webp",
}

func listImgs(cfg *Cfg, what plumbing.Hash) (out []Img) {
	if cfg.ImgPath == "" {
		return nil
	}
	w := what.String()
	sub := path.Join(w[:2], w[2:4], w[4:])
	ents, err := os.ReadDir(path.Join(cfg.ImgPath, sub))
	if err != nil {
		return nil
	}
	out = make([]Img, 0, len(ents))
	for _, ent := range ents {
		name := ent.Name()
		ext := path.Ext(name)
		info, err := ent.Info()
		if err != nil {
			log.Println("imgs: Info():", err)
			continue
		}
		typ := ImgTypes[ext]
		if typ == "" {
			typ = "application/octet-stream"
		}
		out = append(out, Img{
			Path: path.Join(sub, strings.ReplaceAll(ent.Name(), " ", "%20")),
			Alt:  strings.TrimSuffix(name, ext),
			Size: info.Size(),
			Typ:  typ,
		})
	}
	return
}