package main

import (
    "fmt"
	"html/template"
	"path/filepath"
	"regexp"
	"net/http"
)

var (
    	templates = map[string]*template.Template{}
)

// Tempalte helper functions
var funcMap = template.FuncMap {
    "add": func (x, y int) int { return x + y },
    "minus": func (x, y int) int { return x - y },
}


func initTemplates() {
	files, _ := filepath.Glob("templates/pages/*.html")
	re := regexp.MustCompile("templates/pages/(.*).html")
	fmt.Println("Loading Templates:")
	for _, t := range files {
		name := re.FindStringSubmatch(t)
		fmt.Println("  ", name[1])
		templates[name[1]] = template.Must(template.New(name[1]).Funcs(funcMap).ParseFiles("templates/layout.html", t))
	}
}

func ShowTemplate(template string, w http.ResponseWriter, data map[string]interface{}) {
	err := templates[template].ExecuteTemplate(w, "layout.html", data)
	if err != nil {
		fmt.Println("Exec err: ", err)
	}
	// TODO: show error 500 page
}