"use strict"

var coreRenderer = require("../render/render")

module.exports = function($window) {
	var renderService = coreRenderer($window)
	renderService.setEventCallback(function(e) {
		if (e.redraw !== false) redraw()
	})
	
	var callbacks = []
	function subscribe(key, callback) {
		unsubscribe(key)
		callbacks.push(key, callback)
	}
	function unsubscribe(key) {
		var index = callbacks.indexOf(key)
		if (index > -1) callbacks.splice(index, 2)
	}
    function redraw() {
        for (var i = 1; i < callbacks.length; i += 2) {
            callbacks[i]()
        }
    }
	return {subscribe: subscribe, unsubscribe: unsubscribe, redraw: redraw, render: renderService.render}
}