package web

import (
	"fmt"
	"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, err := template.ParseFiles("./templates/base.html", "./templates/help.html")
	if err != nil {
		fmt.Println("Error parsing templates: ", err)
		http.Error(w, "Unable to parse templates", 500)
	}
	err = tmpl.Execute(w, data)
	if err != nil {
		fmt.Println("Error rendering templates: ", err)
		http.Error(w, "Unable to render templates", 500)
	}
}