package main

import (
	"fmt"
	"html/template"
	"net/http"
	"os"
	"strings"
)

//Page : Is exported to PostCollection
type Page struct {
	Title     string
	MenuItems []string
	Posts     []Post
}

var name = "takunomi"
var posts []Post
var sections = []string{"about", "past", "contact"}
var templates = template.Must(template.ParseFiles("blog.tmpl", "blog_roll.tmpl", "style.tmpl", "post.tmpl"))

func main() {

	NewPostsCollection()

	http.HandleFunc("/", blogHandler)
	http.HandleFunc("/post/", postHandler)

	if os.Args[1] == "local" {
		http.ListenAndServe(":8080", nil)
	}

	if os.Args[1] == "ext" {
		http.ListenAndServe(":35291", nil)
	}

}

func errorHandler(w http.ResponseWriter, req *http.Request, status int) {
	w.WriteHeader(status)
	if status == http.StatusNotFound {
		fmt.Fprint(w, "custom 404")
	}
}

func blogHandler(w http.ResponseWriter, req *http.Request) {
	if req.URL.Path != "/" {
		errorHandler(w, req, http.StatusNotFound)
		return
	}
	posts = getNewestPosts(3)
	page := Page{name, sections, posts}
	renderTemplates(w, page)
}

func postHandler(w http.ResponseWriter, r *http.Request) {
	title := strings.TrimPrefix(r.URL.Path, "/post/")
	posts := []Post{getPostByURLTitle(title)}
	page := Page{name, sections, posts}
	renderTemplates(w, page)
}

func renderTemplates(w http.ResponseWriter, p Page) {
	s1 := templates.Lookup("blog.tmpl")
	s1.ExecuteTemplate(w, "blog", p)
	s2 := templates.Lookup("blog_roll.tmpl")
	s2.ExecuteTemplate(w, "blog_roll", nil)
	s3 := templates.Lookup("post.tmpl")
	s3.ExecuteTemplate(w, "post", nil)
}