/*
* jQuery showLoading plugin v1.0
* 
* Copyright (c) 2009 Jim Keller
* Context - http://www.contextllc.com
* 
* Dual licensed under the MIT and GPL licenses.
*
*/

jQuery.fn.showLoading = function (options) {

    var indicatorID;
    var settings = {
        'addClass': '',
        'beforeShow': '',
        'afterShow': '',
        'hPos': 'center',
        'vPos': 'center',
        'indicatorZIndex': 5001,
        'overlayZIndex': 5000,
        'parent': '',
        'marginTop': 0,
        'marginLeft': 0,
        'overlayWidth': null,
        'overlayHeight': null
    };

    jQuery.extend(settings, options);

    var loadingDiv = jQuery('<div></div>');
    var overlayDiv = jQuery('<div></div>');

    //
    // Set up ID and classes
    //
    if (settings.indicatorID) {
        indicatorID = settings.indicatorID;
    }
    else {
        indicatorID = jQuery(this).attr('id');
    }

    jQuery(loadingDiv).attr('id', 'loading-indicator-' + indicatorID);
    jQuery(loadingDiv).addClass('loading-indicator');

    if (settings.addClass) {
        jQuery(loadingDiv).addClass(settings.addClass);
    }



    //
    // Create the overlay
    //
    jQuery(overlayDiv).css('display', 'none');

    // Append to body, otherwise position() doesn't work on Webkit-based browsers
    jQuery(document.body).append(overlayDiv);

    //
    // Set overlay classes
    //
    jQuery(overlayDiv).attr('id', 'loading-indicator-' + indicatorID + '-overlay');

    jQuery(overlayDiv).addClass('loading-indicator-overlay');

    if (settings.addClass) {
        jQuery(overlayDiv).addClass(settings.addClass + '-overlay');
    }

    //
    // Set overlay position
    //

    var overlay_width;
    var overlay_height;

    var border_top_width = jQuery(this).css('border-top-width');
    var border_left_width = jQuery(this).css('border-left-width');

    //
    // IE will return values like 'medium' as the default border, 
    // but we need a number
    //
    border_top_width = isNaN(parseInt(border_top_width)) ? 0 : border_top_width;
    border_left_width = isNaN(parseInt(border_left_width)) ? 0 : border_left_width;

    var overlay_left_pos = jQuery(this).offset().left + parseInt(border_left_width);
    var overlay_top_pos = jQuery(this).offset().top + parseInt(border_top_width);

    if (settings.overlayWidth !== null) {
        overlay_width = settings.overlayWidth;
    }
    else {
        overlay_width = parseInt(jQuery(this).width()) + parseInt(jQuery(this).css('padding-right')) + parseInt(jQuery(this).css('padding-left'));
    }

    if (settings.overlayHeight !== null) {
        overlay_height = settings.overlayWidth;
    }
    else {
        overlay_height = parseInt(jQuery(this).height()) + parseInt(jQuery(this).css('padding-top')) + parseInt(jQuery(this).css('padding-bottom'));
    }


    jQuery(overlayDiv).css('width', overlay_width.toString() + 'px');
    jQuery(overlayDiv).css('height', overlay_height.toString() + 'px');

    jQuery(overlayDiv).css('left', overlay_left_pos.toString() + 'px');
    jQuery(overlayDiv).css('position', 'absolute');

    jQuery(overlayDiv).css('top', overlay_top_pos.toString() + 'px');
    jQuery(overlayDiv).css('z-index', settings.overlayZIndex);

    //
    // Set any custom overlay CSS		
    //
    if (settings.overlayCSS) {
        jQuery(overlayDiv).css(settings.overlayCSS);
    }


    //
    // We have to append the element to the body first
    // or .width() won't work in Webkit-based browsers (e.g. Chrome, Safari)
    //
    jQuery(loadingDiv).css('display', 'none');
    jQuery(document.body).append(loadingDiv);

    jQuery(loadingDiv).css('position', 'absolute');
    jQuery(loadingDiv).css('z-index', settings.indicatorZIndex);

    //
    // Set top margin
    //

    var indicatorTop = overlay_top_pos;

    if (settings.marginTop) {
        indicatorTop += parseInt(settings.marginTop);
    }

    var indicatorLeft = overlay_left_pos;

    if (settings.marginLeft) {
        indicatorLeft += parseInt(settings.marginTop);
    }


    //
    // set horizontal position
    //
    if (settings.hPos.toString().toLowerCase() == 'center') {
        jQuery(loadingDiv).css('left', (indicatorLeft + ((jQuery(overlayDiv).width() - parseInt(jQuery(loadingDiv).width())) / 2)).toString() + 'px');
    }
    else if (settings.hPos.toString().toLowerCase() == 'left') {
        jQuery(loadingDiv).css('left', (indicatorLeft + parseInt(jQuery(overlayDiv).css('margin-left'))).toString() + 'px');
    }
    else if (settings.hPos.toString().toLowerCase() == 'right') {
        jQuery(loadingDiv).css('left', (indicatorLeft + (jQuery(overlayDiv).width() - parseInt(jQuery(loadingDiv).width()))).toString() + 'px');
    }
    else {
        jQuery(loadingDiv).css('left', (indicatorLeft + parseInt(settings.hPos)).toString() + 'px');
    }

    //
    // set vertical position
    //
    if (settings.vPos.toString().toLowerCase() == 'center') {
        jQuery(loadingDiv).css('top', (indicatorTop + ((jQuery(overlayDiv).height() - parseInt(jQuery(loadingDiv).height())) / 2)).toString() + 'px');
    }
    else if (settings.vPos.toString().toLowerCase() == 'top') {
        jQuery(loadingDiv).css('top', indicatorTop.toString() + 'px');
    }
    else if (settings.vPos.toString().toLowerCase() == 'bottom') {
        jQuery(loadingDiv).css('top', (indicatorTop + (jQuery(overlayDiv).height() - parseInt(jQuery(loadingDiv).height()))).toString() + 'px');
    }
    else {
        jQuery(loadingDiv).css('top', (indicatorTop + parseInt(settings.vPos)).toString() + 'px');
    }




    //
    // Set any custom css for loading indicator
    //
    if (settings.css) {
        jQuery(loadingDiv).css(settings.css);
    }


    //
    // Set up callback options
    //
    var callback_options =
			{
			    'overlay': overlayDiv,
			    'indicator': loadingDiv,
			    'element': this
			};

    //
    // beforeShow callback
    //
    if (typeof (settings.beforeShow) == 'function') {
        settings.beforeShow(callback_options);
    }

    //
    // Show the overlay
    //
    jQuery(overlayDiv).show();

    //
    // Show the loading indicator
    //
    jQuery(loadingDiv).show();

    //
    // afterShow callback
    //
    if (typeof (settings.afterShow) == 'function') {
        settings.afterShow(callback_options);
    }

    return this;
};


jQuery.fn.hideLoading = function (options) {


    var settings = {};

    jQuery.extend(settings, options);

    if (settings.indicatorID) {
        indicatorID = settings.indicatorID;
    }
    else {
        indicatorID = jQuery(this).attr('id');
    }

    jQuery(document.body).find('#loading-indicator-' + indicatorID).remove();
    jQuery(document.body).find('#loading-indicator-' + indicatorID + '-overlay').remove();

    return this;
};