/*
 * 	 imBannerRotater - a JQuery Plugin
 * 	 @author Les Green
 * 	 Copyright (C) 2009 Intriguing Minds, Inc.
 *   Version 0.5
 * 
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.

 *   Demo and Documentation can be found at:   
 *   http://www.grasshopperpebbles.com
 *  
 *   Modified to pause 5 seconds after fading in.
 *   
 */
 
;(function($) {
    $.fn.extend({
        imBannerRotater: function(options) {
            opts = $.extend({}, $.bannerRotater.defaults, options);
            return this.each(function() {
                new $.bannerRotater(this, opts);
            });
        }
    });

    $.bannerRotater = function(obj, opts) {
        var $this = $(obj);
        var imgCnt = 0;
        var ttlImg = 0;
        if (opts.image_url) {
            var d = getDataString();
            doAjax('GET', opts.image_url, d, '', doCreate);
        } else {
            doCreate(opts.images);
        }

        function getDataString() {
            var str = '';
            $.each(opts.data, function(i, itm) {
                str += itm.name + "=" + itm.value + "&";
            });
            //remove last "&"
            str = str.substr(0, (str.length - 1));
            return str;
        };

        function doAjax(t, u, d, fnBefore, fnSuccess) {
            var dt = (opts.return_type == 'json') ? 'json' : 'text';
            $.ajax({
                type: t,
                url: u,
                data: d,
                dataType: dt,
                beforeSend: fnBefore, //function(){$("#loading").show("fast");}, //show loading just when link is clicked
                //complete: function(){ $("#loading").hide("fast");}, //stop showing loading when the process is complete
                success: fnSuccess,
                error: showError
            }); //close $.ajax(
        };

        function showError(XMLHttpRequest, textStatus, errorThrown) {
            console.log(textStatus);
        };

        function doCreate(data) {
            //var tbl, tr;
            var img, pic;
            if (opts.return_type == 'list') {
                var daAR = data.split(',');
            } else {
                var daAR = new Array();
                $.each(data, function(i, itm) {
                    if (opts.mode == 'random') {
                        if (opts.data_map.url_name) {
                            daAR[i] = new Array(itm[opts.data_map.image_name], itm[opts.data_map.url_name]);
                        } else {
                            daAR[i] = itm[opts.data_map.image_name];
                        }
                    } else {
                        daAR[i] = itm[opts.data_map.image_name];
                    }
                });
            }
            if (opts.mode == 'random') {
                img = new Image();
                if (opts.data_map.url_name) {
                    var tgt = (opts.data_map.url_target) ? opts.data_map.url_target : '_blank';
                    var sel = daAR[Math.floor(Math.random() * daAR.length)];
                    pic = opts.base_path + sel[0];
                    var url = sel[1];
                    $this.append($('<a></a>').attr({ 'href': url, 'target': tgt }).append($(img).attr({ src: pic, alt: pic })));
                } else {
                    pic = opts.base_path + daAR[Math.floor(Math.random() * daAR.length)];
                    $this.append($(img).attr({ src: pic, alt: pic }));
                }
            } else {
                ttlImg = daAR.length;
                for (var i = 0; i < ttlImg; i++) {
                    pic = opts.base_path + daAR[i];
                    img = new Image();
                    $this.append($(img).attr({ src: pic, alt: pic }).css('display', 'none'));
                }
                imgFadeIn();
            }
        };

        function imgFadeIn() {
            $("img:hidden:eq(" + imgCnt + ")", $this).fadeIn(opts.speed, function() {
                pausecomp(5000);
                imgFadeOut();
            });
        };

        function imgFadeOut() {
            $("img:eq(" + imgCnt + ")", $this).fadeOut(opts.speed, function() {
                imgCnt = (imgCnt == ttlImg - 1) ? 0 : imgCnt + 1;
                imgFadeIn();
            });
        };

        //http://www.sean.co.uk/a/webdesign/javascriptdelay.shtm
        function pausecomp(millis) {
            var date = new Date();
            var curDate = null;

            do { curDate = new Date(); }
            while (curDate - date < millis);
        }
    };

    $.bannerRotater.defaults = {
        mode: 'random', //rotate
        image_url: '',
        data: '',
        images: '', //can be used instead of image_url. contains comma delimited list of images
        return_type: 'list', //list, json
        base_path: '',
        data_map: '', //{image_name: '', url_name: '', url_target: '_blank'}
        speed: 1500
    };
})(jQuery);