package main

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

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

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

func main() {

	NewPostsCollection()

	http.HandleFunc("/about/", aboutHandler)
	http.HandleFunc("/past/", pastHandler)
	http.HandleFunc("/contact/", contactHandler)
	http.HandleFunc("/post/", postHandler)
	http.HandleFunc("/", blogHandler)
	http.Handle("/images/", http.StripPrefix("/images/", http.FileServer(http.Dir("images"))))
	http.Handle("/css/", http.StripPrefix("/css/", http.FileServer(http.Dir("css"))))

	//posts = PostsCollection[:]
	setPostsCollection()

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

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

}

func setPostsCollection() {
	posts = PostsCollection[:]
}

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
	}
	length := len(posts)
	posts = posts[:3]
	//posts = getNewestPosts(3)
	page := Page{name, posts, "blog"}
	renderTemplates(w, page)
	posts = posts[:length]
}

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

func aboutHandler(w http.ResponseWriter, r *http.Request) {
	page := Page{name, []Post{}, "about"}
	renderTemplates(w, page)
}

func pastHandler(w http.ResponseWriter, r *http.Request) {
	page := Page{name, posts, "past"}
	renderTemplates(w, page)
}

func contactHandler(w http.ResponseWriter, r *http.Request) {
	page := Page{name, []Post{}, "contact"}
	renderTemplates(w, page)
}

func renderTemplates(w http.ResponseWriter, p Page) {
	s1 := templates.Lookup("blog.tmpl")
	err := s1.ExecuteTemplate(w, "blog", p)
	if err != nil {
		fmt.Println("error is ", err)
	}
}