/**
 * The MIT License (MIT)
 * 
 * Copyright (c) 2014 Petka Antonov
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:</p>
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 * 
 */
"use strict";
module.exports = function(Promise, INTERNAL) {
var errors = require("./errors.js");
var canAttachTrace = errors.canAttachTrace;
var async = require("./async.js");
var CancellationError = errors.CancellationError;

Promise.prototype._cancel = function (reason) {
    if (!this.isCancellable()) return this;
    var parent;
    var promiseToReject = this;
    while ((parent = promiseToReject._cancellationParent) !== undefined &&
        parent.isCancellable()) {
        promiseToReject = parent;
    }
    this._unsetCancellable();
    promiseToReject._attachExtraTrace(reason);
    promiseToReject._rejectUnchecked(reason);
};

Promise.prototype.cancel = function (reason) {
    if (!this.isCancellable()) return this;
    reason = reason !== undefined
        ? (canAttachTrace(reason) ? reason : new Error(reason + ""))
        : new CancellationError();
    async.invokeLater(this._cancel, this, reason);
    return this;
};

Promise.prototype.cancellable = function () {
    if (this._cancellable()) return this;
    this._setCancellable();
    this._cancellationParent = undefined;
    return this;
};

Promise.prototype.uncancellable = function () {
    var ret = new Promise(INTERNAL);
    ret._propagateFrom(this, 2 | 4);
    ret._follow(this);
    ret._unsetCancellable();
    return ret;
};

Promise.prototype.fork = function (didFulfill, didReject, didProgress) {
    var ret = this._then(didFulfill, didReject, didProgress,
                         undefined, undefined);

    ret._setCancellable();
    ret._cancellationParent = undefined;
    return ret;
};
};
