/*
	Copyright (c) 2004-2006, The Dojo Foundation
	All Rights Reserved.

	Licensed under the Academic Free License version 2.1 or above OR the
	modified BSD license. For more information on Dojo licensing, see:

		http://dojotoolkit.org/community/licensing.shtml
*/

dojo.require("dojo.Deferred");

dojo.provide("dojo.DeferredList");


dojo.DeferredList = function (list, /*bool?*/ fireOnOneCallback, /*bool?*/ fireOnOneErrback, /*bool?*/ consumeErrors, /*Function?*/ canceller) {
    this.list = list;
    this.resultList = new Array(this.list.length);

    // Deferred init
    this.chain = [];
    this.id = this._nextId();
    this.fired = -1;
    this.paused = 0;
    this.results = [null, null];
    this.canceller = canceller;
    this.silentlyCancelled = false;

    if (this.list.length === 0 && !fireOnOneCallback) {
        this.callback(this.resultList);
    }

    this.finishedCount = 0;
    this.fireOnOneCallback = fireOnOneCallback;
    this.fireOnOneErrback = fireOnOneErrback;
    this.consumeErrors = consumeErrors;

    var index = 0;

    var _this = this;

    dojo.lang.forEach(this.list, function(d) {
        var _index = index;
        //dojo.debug("add cb/errb index "+_index);
        d.addCallback(function(r) { _this._cbDeferred(_index, true, r) });
        d.addErrback(function(r) { _this._cbDeferred(_index, false, r) });
        index++;
    });

};


dojo.inherits(dojo.DeferredList, dojo.Deferred);

dojo.lang.extend(dojo.DeferredList, {

    _cbDeferred: function (index, succeeded, result) {
        //dojo.debug("Fire "+index+" succ "+succeeded+" res "+result);
        this.resultList[index] = [succeeded, result];
        this.finishedCount += 1;
        if (this.fired !== 0) {
            if (succeeded && this.fireOnOneCallback) {
                this.callback([index, result]);
            } else if (!succeeded && this.fireOnOneErrback) {
                this.errback(result);
            } else if (this.finishedCount == this.list.length) {
                this.callback(this.resultList);
            }
        }
        if (!succeeded && this.consumeErrors) {
            result = null;
        }
        return result;
    },

    gatherResults: function (deferredList) {
        var d = new dojo.DeferredList(deferredList, false, true, false);
        d.addCallback(function (results) {
            var ret = [];
            for (var i = 0; i < results.length; i++) {
                ret.push(results[i][1]);
            }
            return ret;
        });
        return d;
    }
});