/**
 * Copyright (c) 2013 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 ASSERT = require("./assert.js");
var ensureNotHandled = require("./errors.js").ensureNotHandled;
var util = require("./util.js");
var async = require("./async.js");
var hasOwn = {}.hasOwnProperty;
var isArray = util.isArray;

function toResolutionValue(val) {
    switch(val) {
    case -1: return void 0;
    case -2: return [];
    case -3: return {};
    }
}

function PromiseArray(values, caller, boundTo) {
    var promise = this._promise = new Promise(INTERNAL);
    var parent = void 0;
    if (Promise.is(values)) {
        parent = values;
        if (values._cancellable()) {
            promise._setCancellable();
            promise._cancellationParent = values;
        }
        if (values._isBound()) {
            promise._setBoundTo(boundTo);
        }
    }
    promise._setTrace(caller, parent);
    this._values = values;
    this._length = 0;
    this._totalResolved = 0;
    this._init(void 0, -2);
}
PromiseArray.PropertiesPromiseArray = function() {};

PromiseArray.prototype.length = function PromiseArray$length() {
    return this._length;
};

PromiseArray.prototype.promise = function PromiseArray$promise() {
    return this._promise;
};

PromiseArray.prototype._init =
function PromiseArray$_init(_, resolveValueIfEmpty) {
    var values = this._values;
    if (Promise.is(values)) {
        if (values.isFulfilled()) {
            values = values._settledValue;
            if (!isArray(values)) {
                var err = new Promise.TypeError("expecting an array, a promise or a thenable");
                this.__hardReject__(err);
                return;
            }
            this._values = values;
        }
        else if (values.isPending()) {
            values._then(
                this._init,
                this._reject,
                void 0,
                this,
                resolveValueIfEmpty,
                this.constructor
           );
            return;
        }
        else {
            this._reject(values._settledValue);
            return;
        }
    }

    if (values.length === 0) {
        this._resolve(toResolutionValue(resolveValueIfEmpty));
        return;
    }
    var len = values.length;
    var newLen = len;
    var newValues;
    if (this instanceof PromiseArray.PropertiesPromiseArray) {
        newValues = this._values;
    }
    else {
        newValues = new Array(len);
    }
    var isDirectScanNeeded = false;
    for (var i = 0; i < len; ++i) {
        var promise = values[i];
        if (promise === void 0 && !hasOwn.call(values, i)) {
            newLen--;
            continue;
        }
        var maybePromise = Promise._cast(promise, void 0, void 0);
        if (maybePromise instanceof Promise &&
            maybePromise.isPending()) {
            maybePromise._proxyPromiseArray(this, i);
        }
        else {
            isDirectScanNeeded = true;
        }
        newValues[i] = maybePromise;
    }
    if (newLen === 0) {
        if (resolveValueIfEmpty === -2) {
            this._resolve(newValues);
        }
        else {
            this._resolve(toResolutionValue(resolveValueIfEmpty));
        }
        return;
    }
    this._values = newValues;
    this._length = newLen;
    if (isDirectScanNeeded) {
        var scanMethod = newLen === len
            ? this._scanDirectValues
            : this._scanDirectValuesHoled;
        scanMethod.call(this, len);
    }
};

PromiseArray.prototype._settlePromiseAt =
function PromiseArray$_settlePromiseAt(index) {
    var value = this._values[index];
    if (!Promise.is(value)) {
        this._promiseFulfilled(value, index);
    }
    else if (value.isFulfilled()) {
        this._promiseFulfilled(value._settledValue, index);
    }
    else if (value.isRejected()) {
        this._promiseRejected(value._settledValue, index);
    }
};

PromiseArray.prototype._scanDirectValuesHoled =
function PromiseArray$_scanDirectValuesHoled(len) {
    for (var i = 0; i < len; ++i) {
        if (this._isResolved()) {
            break;
        }
        if (hasOwn.call(this._values, i)) {
            this._settlePromiseAt(i);
        }
    }
};

PromiseArray.prototype._scanDirectValues =
function PromiseArray$_scanDirectValues(len) {
    for (var i = 0; i < len; ++i) {
        if (this._isResolved()) {
            break;
        }
        this._settlePromiseAt(i);
    }
};

PromiseArray.prototype._isResolved = function PromiseArray$_isResolved() {
    return this._values === null;
};

PromiseArray.prototype._resolve = function PromiseArray$_resolve(value) {
    this._values = null;
    this._promise._fulfill(value);
};

PromiseArray.prototype.__hardReject__ =
PromiseArray.prototype._reject = function PromiseArray$_reject(reason) {
    ensureNotHandled(reason);
    this._values = null;
    this._promise._attachExtraTrace(reason);
    this._promise._reject(reason);
};

PromiseArray.prototype._promiseProgressed =
function PromiseArray$_promiseProgressed(progressValue, index) {
    if (this._isResolved()) return;
    this._promise._progress({
        index: index,
        value: progressValue
    });
};


PromiseArray.prototype._promiseFulfilled =
function PromiseArray$_promiseFulfilled(value, index) {
    if (this._isResolved()) return;
    this._values[index] = value;
    var totalResolved = ++this._totalResolved;
    if (totalResolved >= this._length) {
        this._resolve(this._values);
    }
};

PromiseArray.prototype._promiseRejected =
function PromiseArray$_promiseRejected(reason, index) {
    if (this._isResolved()) return;
    this._totalResolved++;
    this._reject(reason);
};

return PromiseArray;
};
