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)
    } else {
        err := t.Execute(writer, Context{  request, Products})
        if (err != nil) {
            http.Error(writer, err.Error(), http.StatusInternalServerError)
        }
    }
}

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) {
        http.Handle("/templates/", http.StripPrefix("/templates/", 
            http.HandlerFunc(HandleTemplateRequest)))        
    } else {
        panic(err)
    }
}