package main

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

type Context struct {
	Request *http.Request
	Data    []Product
}

var htmlTemplates *template.Template

func HandleTemplateRequest(writer http.ResponseWriter, request *http.Request) {
	path := request.URL.Path
	if path == "" {
		path = "products.html"
	}
	t := htmlTemplates.Lookup(path)
	if t == nil {
		http.NotFound(writer, request)
		return
	}
	err := t.Execute(writer, Context{request, ProductList})
	if err != nil {
		http.Error(writer, err.Error(), http.StatusInternalServerError)
		return
	}
}

func init() {
	var err error
	htmlTemplates = template.New("all")
	htmlTemplates.Funcs(map[string]interface{}{
		"intVal": strconv.Atoi,
	})
	htmlTemplates, err = htmlTemplates.ParseGlob("templates/*.html")
	if err != nil {
		panic(err)
		return
	}
	http.Handle("/templates/", http.StripPrefix("/templates/", http.HandlerFunc(HandleTemplateRequest)))
}