/**
 * 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 async = require("./async.js");
    var ASSERT = require("./assert.js");
    var CancellationError = errors.CancellationError;
    var SYNC_TOKEN = {};

    Promise.prototype._cancel = function Promise$_cancel() {
        if (!this.isCancellable()) return this;
        var parent;
        if ((parent = this._cancellationParent) !== void 0) {
            parent.cancel(SYNC_TOKEN);
            return;
        }
        var err = new CancellationError();
        this._attachExtraTrace(err);
        this._rejectUnchecked(err);
    };

    Promise.prototype.cancel = function Promise$cancel(token) {
        if (!this.isCancellable()) return this;
        if (token === SYNC_TOKEN) {
            this._cancel();
            return this;
        }
        async.invokeLater(this._cancel, this, void 0);
        return this;
    };

    Promise.prototype.cancellable = function Promise$cancellable() {
        if (this._cancellable()) return this;
        this._setCancellable();
        this._cancellationParent = void 0;
        return this;
    };

    Promise.prototype.uncancellable = function Promise$uncancellable() {
        var ret = new Promise(INTERNAL);
        ret._setTrace(this.uncancellable, this);
        ret._follow(this);
        ret._unsetCancellable();
        if (this._isBound()) ret._setBoundTo(this._boundTo);
        return ret;
    };

    Promise.prototype.fork =
    function Promise$fork(didFulfill, didReject, didProgress) {
        var ret = this._then(didFulfill, didReject, didProgress,
            void 0, void 0, this.fork);

        ret._setCancellable();
        ret._cancellationParent = void 0;
        return ret;
    };
};