package templates

import (
	_ "embed"
	"html/template"
	"mime/multipart"
	"strconv"
	"strings"
	"sync"

	"github.com/rs/zerolog/log"
)

var funcMap = template.FuncMap{
	"year": func(s int) string {
		if s == 0 {
			return ""
		}
		return strconv.Itoa(s)
	},
	"join": func(s []string) string {
		if len(s) == 0 {
			return ""
		} else {
			return strings.Join(s, ",")
		}
	},
	"filename": func(h *multipart.FileHeader) string {
		if h != nil {
			return h.Filename
		}
		return ""
	},
}

//go:embed form.html.tpl
var form string

var GetUploadForm = sync.OnceValue[*template.Template](func() *template.Template {
	tmpl, err := template.New("uploadForm").Funcs(funcMap).Parse(form)
	if err != nil {
		log.Err(err).Msg("unable to parse upload form")
		return nil
	}
	return tmpl
})