AfbCtxItf = (function(){

	var UUID = undefined;
	var TOKEN = undefined;

	function AfbCtxItf(token, uuid) {
		this.token = token;
		this.uuid = uuid;
	}

	AfbCtxItf.prototype = {
		get token() {return TOKEN;},
		set token(tok) {if(tok) TOKEN=tok;},
		get uuid() {return UUID;},
		set uuid(id) {if(id) UUID=id;}
	};

	return AfbCtxItf;
})();


AfbWsItf = (function(){

	var CALL = 2;
	var RETOK = 3;
	var RETERR = 4;

	function AfbWsItf(base, onopen, onabort, ctx) {
		ctx = ctx || new AfbCtxItf();
		var wl = window.location;
		var u = "ws://"+wl.host+"/"+base;
		if (ctx.token) {
			u = u + '?x-afb-token=' + ctx.token;
			if (ctx.uuid)
				u = u + '&x-afb-uuid=' + ctx.uuid;
		}
		this.ws = new (WebSocket || MozWebSocket)(u, [ "x-afb-ws-json1" ]);
		this.pendings = {};
		this.counter = 0;
		this.ctx = ctx;
		this.ws.onopen = onopen.bind(this);
		this.ws.onerror = onerror.bind(this);
		this.ws.onclose = onclose.bind(this);
		this.ws.onmessage = onmessage.bind(this);
		this.onopen = onopen;
		this.onabort = onabort;
	}

	function onerror(event) {
		var f = this.onabort;
		if (f) {
			delete this.onopen;
			delete this.onabort;
			f && f(this);
		}
		this.onerror && this.onerror(this);
	}

	function onopen(event) {
		var f = this.onopen;
		delete this.onopen;
		delete this.onabort;
		f && f(this);
	}

	function onclose(event) {
		for (var id in this.pendings) {
			var ferr = this.pendings[id].onerror;
			ferr && ferr(null, this);
		}
		this.pendings = {};
		this.onclose && this.onclose();
	}

	function onmessage(event) {
		var obj = JSON.parse(event.data);
		var code = obj[0];
		var id = obj[1];
		var ans = obj[2];
		this.ctx.token = obj[3];
		var pend;
		if (id && id in this.pendings) {
			pend = this.pendings[id];
			delete this.pendings[id];
		}
		switch (code) {
		case RETOK:
			pend && pend.onsuccess && pend.onsuccess(ans, this);
			break; 
		case RETERR:
		default:
			pend && pend.onerror && pend.onerror(ans, this);
			break; 
		}
	}

	function close() {
		this.ws.close();
	}

	function call(api, verb, request, onsuccess, onerror) {
		var id = String(++this.counter);
		this.pendings[id] = { onsuccess: onsuccess, onerror: onerror };
		var arr = [CALL, id, api+"/"+verb, request ];
		if (this.ctx.token) arr.push(this.ctx.token);
		this.ws.send(JSON.stringify(arr));
	}

	AfbWsItf.prototype = {
		close: close,
		call: call
	};

	return AfbWsItf;
})();