package web

import (
	"html/template"
	"net/http"

	"git.fjla.uk/fred.boniface/barcodes/validation"
)

func helpTemplate(w http.ResponseWriter, r *http.Request) {
	i := 0
	barcodeOptions := make([]string, len(validation.FormatRules))
	for k := range validation.FormatRules {
		barcodeOptions[i] = k
		i++
	}

	type dataType struct {
		BarcodeOptions []string
	}
	data := dataType{
		BarcodeOptions: barcodeOptions,
	}

	tmpl := template.Must(template.New("help.html").ParseFiles("templates/help.html"))

	err := tmpl.Execute(w, data)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
}