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var ctx = require('./_ctx');
var invoke = require('./_invoke');
var html = require('./_html');
var cel = require('./_dom-create');
var global = require('./_global');
var process = global.process;
var setTask = global.setImmediate;
var clearTask = global.clearImmediate;
var MessageChannel = global.MessageChannel;
var Dispatch = global.Dispatch;
var counter = 0;
var queue = {};
var ONREADYSTATECHANGE = 'onreadystatechange';
var defer, channel, port;
var run = function () {
var id = +this;
// eslint-disable-next-line no-prototype-builtins
if (queue.hasOwnProperty(id)) {
var fn = queue[id];
delete queue[id];
fn();
}
};
var listener = function (event) {
run.call(event.data);
};
// Node.js 0.9+ & IE10+ has setImmediate, otherwise:
if (!setTask || !clearTask) {
setTask = function setImmediate(fn) {
var args = [];
var i = 1;
while (arguments.length > i) args.push(arguments[i++]);
queue[++counter] = function () {
// eslint-disable-next-line no-new-func
invoke(typeof fn == 'function' ? fn : Function(fn), args);
};
defer(counter);
return counter;
};
clearTask = function clearImmediate(id) {
delete queue[id];
};
// Node.js 0.8-
if (require('./_cof')(process) == 'process') {
defer = function (id) {
process.nextTick(ctx(run, id, 1));
};
// Sphere (JS game engine) Dispatch API
} else if (Dispatch && Dispatch.now) {
defer = function (id) {
Dispatch.now(ctx(run, id, 1));
};
// Browsers with MessageChannel, includes WebWorkers
} else if (MessageChannel) {
channel = new MessageChannel();
port = channel.port2;
channel.port1.onmessage = listener;
defer = ctx(port.postMessage, port, 1);
// Browsers with postMessage, skip WebWorkers
// IE8 has postMessage, but it's sync & typeof its postMessage is 'object'
} else if (global.addEventListener && typeof postMessage == 'function' && !global.importScripts) {
defer = function (id) {
global.postMessage(id + '', '*');
};
global.addEventListener('message', listener, false);
// IE8-
} else if (ONREADYSTATECHANGE in cel('script')) {
defer = function (id) {
html.appendChild(cel('script'))[ONREADYSTATECHANGE] = function () {
html.removeChild(this);
run.call(id);
};
};
// Rest old browsers
} else {
defer = function (id) {
setTimeout(ctx(run, id, 1), 0);
};
}
}
module.exports = {
set: setTask,
clear: clearTask
};
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