package main

import (
	"crypto/md5"
	"encoding/base64"
	"html/template"
	"io/ioutil"
	"log"
	"net/http"
)

func main() {
	// Take user input, save it
	http.HandleFunc("/create", createPost)
	// Retrieve that, display it
	http.HandleFunc("/post/", viewPost)
	// Show an editor
	http.HandleFunc("/", viewEditor)

	log.Print("Listening...")
	log.Fatal(http.ListenAndServe(":8888", nil))
}

func viewPost(w http.ResponseWriter, r *http.Request) {
	log.Print(r.URL.Path)

	id := r.URL.Path[len("/post/"):]
	data, err := ioutil.ReadFile(id + ".txt")
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	t, err := template.ParseFiles("post.html")
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	t.Execute(w, string(data))
}

func createPost(w http.ResponseWriter, r *http.Request) {
	log.Print(r.URL.Path)

	data := r.FormValue("stuff")
	h := md5.New()
	idHash := h.Sum([]byte(data))
	id := base64.StdEncoding.EncodeToString(idHash)[:20]

	err := ioutil.WriteFile(id+".txt", []byte(data), 0600)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	http.Redirect(w, r, "/post/"+id, http.StatusFound)
}

func viewEditor(w http.ResponseWriter, r *http.Request) {
	log.Print(r.URL.Path)

	// Display editor
	t, err := template.ParseFiles("editor.html")
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	t.Execute(w, nil)
}