package www

import (
	"log"
	"strconv"
	"html/template"
	"net/http"	
	"github.com/gorilla/websocket"
	"../playlist"
)

// todo: hub - https://stackoverflow.com/questions/31532652/go-websocket-send-all-clients-a-message

var pp 	*playlist.PrettyPlaylist
var p 	*playlist.Playlist

var pln = log.Println

type op_t struct {
	OP		string 	`json:"op"`
	ID		string 	`json:"id"`
	INDEX 	int 	`json:"index"`
}

var upgrader = websocket.Upgrader{
    ReadBufferSize: 512,
    WriteBufferSize: 512,
}

func Init(playlist *playlist.Playlist) {
	p = playlist
	pp = p.Pretty() 
	http.HandleFunc("/pp", pp_handler)
	http.HandleFunc("/ppop", pp_operations)
}

func pp_handler(w http.ResponseWriter, r *http.Request) {
	t, err := template.ParseFiles("./www/tmpl/playlist.html")
	if err != nil {
		pln(err)
		return
	}
	pp.Print()
	t.Execute(w, pp)
}

func pp_operations(w http.ResponseWriter, r *http.Request) {
	pln("x")
	c, err := upgrader.Upgrade(w, r, nil)
	if err != nil {
		pln(err)
		return
	}
	go readop(c)
}

func readop(c *websocket.Conn) {
	for {
		opdata := &op_t{}
		if err := c.ReadJSON(&opdata); err != nil {
			pln(err)
			return	//connection lost?
		}

		if opdata.OP == "move" {
			if id, err := strconv.ParseUint(opdata.ID, 10, 32); err == nil {
				p.Move(uint32(id), opdata.INDEX)
				pp = p.Pretty()
				pp.Print()		
			}			
		}

		pln(opdata.OP)
		pln(opdata.ID)
		pln(opdata.INDEX)
		if err := c.WriteJSON(opdata); err != nil {
			pln(err)
			return			//connection lost?
		}		
	}
}

// func pp_operations(ws *websocket.Conn) {
// 	opdata := &op_t{}
// 	if err := websocket.JSON.Receive(ws, &opdata); err != nil {
// 		pln(err)
// 	}
// 	// websocket.JSON.Send(ws, "ok")
// 	pln(opdata.OP)
// 	pln(opdata.ID)
// 	pln(opdata.INDEX)
// }