package router

import (
	"html/template"
	"io/fs"
	"path/filepath"
	"strings"
	webtpl "videoweb/app/template"
)

func mustHTMLTemplate(funcMap template.FuncMap) *template.Template {
	tmpl := template.New("").Funcs(funcMap)
	err := fs.WalkDir(webtpl.FS, ".", func(path string, d fs.DirEntry, err error) error {
		if err != nil || d.IsDir() {
			return err
		}
		if !strings.HasSuffix(strings.ToLower(d.Name()), ".html") {
			return nil
		}
		body, err := webtpl.FS.ReadFile(path)
		if err != nil {
			return err
		}
		_, err = tmpl.New(filepath.Base(path)).Parse(string(body))
		return err
	})
	if err != nil {
		panic(err)
	}
	if tmpl.Lookup("index.html") == nil {
		panic("embedded html templates are empty")
	}
	return tmpl
}