package main

import (
	"html/template"
	"log"
	"net/http"
	"strings"
	"path/filepath"
	"os"
)

func getTemplateDir() string {
	exePath, err := os.Executable()
	if err != nil {
		log.Fatal(err)
	}
	exeDir := filepath.Dir(exePath)

	testPath := filepath.Join(exeDir, "templates")
	if _, err := os.Stat(testPath); err == nil {
		return testPath
	}
	// if running using: go run use wd 
	wd, err := os.Getwd()
	if err != nil {
		log.Fatal(err)
	}
	return filepath.Join(wd, "templates")
}

func pageHandler(w http.ResponseWriter, r *http.Request) {
	path := strings.Trim(r.URL.Path, "/")
	if path == "" {
		path = "home"
	}	


	templateDir := getTemplateDir()

	tmpl, err := template.ParseFiles(
		filepath.Join(templateDir, "layout.html"),
		filepath.Join(templateDir, "header.html"),
		filepath.Join(templateDir, "footer.html"),
		filepath.Join(templateDir, path+".html"),
	)
	if err != nil {
		http.NotFound(w, r)
		return
	}

	err = tmpl.ExecuteTemplate(w, "layout", nil)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func main() {
	http.HandleFunc("/", pageHandler)

	log.Println("Server running at http://localhost:14888")
	log.Fatal(http.ListenAndServe(":14888", nil))
}