/*

This file contains only functions necessary for the article features
The full library code and enhanced versions of the functions present
here can be found at http://v2studio.com/k/code/lib/ */

if (!Array.prototype.push) Array.prototype.push = function() {
    for (var i=0; i<arguments.length; i++) this[this.length] = arguments[i];
    return this.length;
}

Array.prototype.find = function(value, start) {
    start = start || 0;
    for (var i=start; i<this.length; i++)
        if (this[i]==value)
            return i;
    return -1;
}

Array.prototype.has = function(value) {
    return this.find(value)!==-1;
}

// FUNCTIONAL

function map(list, func) {
    var result = [];
    func = func || function(v) {return v};
    for (var i=0; i < list.length; i++) result.push(func(list[i], i, list));
    return result;
}

function filter(list, func) {
    var result = [];
    func = func || function(v) {return v};
    map(list, function(v) { if (func(v)) result.push(v) } );
    return result;
}


// DOM

function getElem(elem) {
    if (document.getElementById) {
        if (typeof elem == "string") {
            elem = document.getElementById(elem);
            if (elem===null) throw 'cannot get element: element does not exist';
        } else if (typeof elem != "object") {
            throw 'cannot get element: invalid datatype';
        }
    } else throw 'cannot get element: unsupported DOM';
    return elem;
}

function hasClass(elem, className) {
    return getElem(elem).className.split(' ').has(className);
}

function getElementsByClass(className, tagName, parentNode) {
    parentNode = !isUndefined(parentNode)? getElem(parentNode) : document;
    if (isUndefined(tagName)) tagName = '*';
    return filter(parentNode.getElementsByTagName(tagName),
        function(elem) { return hasClass(elem, className) });
}


// DOM EVENTS

function listen(event, elem, func) {
    elem = getElem(elem);
    if (elem.addEventListener)  // W3C DOM
        elem.addEventListener(event,func,false);
    else if (elem.attachEvent)  // IE DOM
        elem.attachEvent('on'+event, function(){ func(new W3CDOM_Event(elem)) } );
        // for IE we use a wrapper function that passes in a simplified faux Event object.
    else throw 'cannot add event listener';
}

function mlisten(event, elem_list, func) {
    map(elem_list, function(elem) { listen(event, elem, func) } );
}

function W3CDOM_Event(currentTarget) {
    this.currentTarget  = currentTarget;
    this.preventDefault = function() { window.event.returnValue = false }
    return this;
}


// MISC CLEANING-AFTER-MICROSOFT STUFF

function isUndefined(v) {
    var undef;
    return v===undef;
}

// These defaults should be changed the way it best fits your site

var _POPUP_FEATURES = 'location=0,statusbar=0,menubar=0,width=444,height=540,scrollbars=yes,screenX=10,screenY=10,left=10,top=10';

listen('load', window, function() {
	mlisten('click', getElementsByClass('popupSm','a'), event_popup_features('width=360,height=480,scrollbars=yes,screenX=10,screenY=10,left=10,top=10') );
	mlisten('click', getElementsByClass('popupSmNoScroll','a'), event_popup_features('width=360,height=480,scrollbars=no,screenX=10,screenY=10,left=10,top=10') );
	mlisten('click', getElementsByClass('popupMd','a'), event_popup_features('width=480,height=600,scrollbars=yes,screenX=10,screenY=10,left=10,top=10') );
	mlisten('click', getElementsByClass('popupMdNoScroll','a'), event_popup_features('width=480,height=600,scrollbars=no,screenX=10,screenY=10,left=10,top=10') );
	mlisten('click', getElementsByClass('popupLg','a'), event_popup_features('width=760,height=540,scrollbars=yes,screenX=10,screenY=10,left=10,top=10') );
	mlisten('click', getElementsByClass('popupLgNoScroll','a'), event_popup_features('width=760,height=540,scrollbars=yes,screenX=10,screenY=10,left=10,top=10') );
	mlisten('click', getElementsByClass('portrait','a'), event_popup_features('width=500,height=660,scrollbars=yes,screenX=10,screenY=10,left=10,top=10') );
	mlisten('click', getElementsByClass('portraitNoScroll','a'), event_popup_features('width=500,height=660,scrollbars=no,screenX=10,screenY=10,left=10,top=10') );
	mlisten('click', getElementsByClass('landscape','a'), event_popup_features('width=660,height=500,scrollbars=yes,screenX=10,screenY=10,left=10,top=10') );
	mlisten('click', getElementsByClass('landscapeNoScroll','a'), event_popup_features('width=660,height=500,scrollbars=no,screenX=10,screenY=10,left=10,top=10') );
	mlisten('click', getElementsByClass('square','a'), event_popup_features('width=660,height=660,scrollbars=yes,screenX=10,screenY=10,left=10,top=10') );
	mlisten('click', getElementsByClass('squareNoScroll','a'), event_popup_features('width=660,height=660,scrollbars=no,screenX=10,screenY=10,left=10,top=10') );
});

function raw_popup(url, target, features) {
    // pops up a window containing url optionally named target, optionally having features
    if (isUndefined(features)) features = _POPUP_FEATURES;
    if (isUndefined(target  )) target   = '_blank';
    var theWindow = window.open(url, target, features);
    theWindow.focus();
    return theWindow;
}

function link_popup(src, features) {
    // to be used in an html event handler as in: <a href="..." onclick="link_popup(this,...)" ...
    // pops up a window grabbing the url from the event source's href
    return raw_popup(src.getAttribute('href'), src.getAttribute('target') || '_blank', features);
}

function event_popup(e) {
    // to be passed as an event listener
    // pops up a window grabbing the url from the event source's href
    link_popup(e.currentTarget);
    e.preventDefault();
}

function event_popup_features(features) {
    // generates an event listener similar to event_popup, but allowing window features
    return function(e) { link_popup(e.currentTarget, features); e.preventDefault() }
}