/*!
    jqthumb v1.9.5
    copyright (c) 2013-2014
    dual licensed under the mit and gpl licenses.

    author       : pak cheong
    version      : 1.9.5
    repo         : https://github.com/pakcheong/jqthumb
    demo         : http://pakcheong.github.io/jqthumb/
    last updated : thursday, july 10th, 2014, 5:18:48 pm
    requirements : jquery >=v1.3.0 or zepto (with zepto-data plugin) >=v1.0.0
*/
;(function ( $, window, document, undefined ) {

    var pluginname  = "jqthumb",
        grandglobal = { outputelems: [], inputelems: [] },
        defaults    = {
            classname      : 'jqthumb',
            width          : 100,
            height         : 100,
            position       : { top: '50%', left: '50%' },
            source         : 'src',
            showoncomplete : true,
            before         : function(){},
            after          : function(){},
            done           : function(){}
        };


    function plugin ( element, options ) {// the actual plugin constructor
        this.element                = element;
        this.settings               = $.extend( {}, defaults, options );
        this.settings.width         = this.settings.width.tostring().replace(/px/g, '');
        this.settings.height        = this.settings.height.tostring().replace(/px/g, '');
        this.settings.position.top  = this.settings.position.top.tostring().replace(/px/g, '');
        this.settings.position.left = this.settings.position.left.tostring().replace(/px/g, '');
        this._defaults              = defaults;
        this._name                  = pluginname;
        if(typeof options == 'string'){
            if(options.tolowercase() == 'kill'){
                this.kill(this.element);
            }
        }else{
            this.init();
        }
    }

    plugin.prototype = {
        init: function () {
            if(this.support_css3_attr('backgroundsize') === false){ // old browsers need to do calculation to perform same output like "background-size: cover"
                this.noncss3supported_method(this.element, this.settings);
            }else{ // modern browsers that support css3 would be easier
                this.css3supported_method(this.element, this.settings);
            }
        },

        kill: function(_this){
            if( $(_this).data(pluginname)){

                if($(_this).prev().data(pluginname) !== pluginname){
                    console.error('we could not find the element created by jqthumb. it is probably due to one or more element has been added right before the image element after the plugin initialization, or it was removed.');
                    return false;
                }

                /* start: remove output elements */
                var temparr = [];
                $.each(grandglobal.outputelems, function(index, obj){
                    if($(obj)[0] == $(_this).prev()[0]){
                    }else{
                        temparr.push(grandglobal.outputelems[index]);
                    }
                });
                grandglobal.outputelems = temparr;
                /* end: remove output elements */

                /* start: remove input elements */
                temparr = [];
                $.each(grandglobal.inputelems, function(index, obj){
                    if($(obj)[0] == $(_this)[0]){
                    }else{
                        temparr.push(grandglobal.inputelems[index]);
                    }
                });
                grandglobal.inputelems = temparr;
                /* end: remove input elements */

                $(_this).prev().remove();

                $(_this).removeattr('style'); // first, remove all the styles first
                if(typeof $(_this).data(pluginname + '-original-styles') !== 'undefined'){
                    $(_this).attr('style', $(_this).data(pluginname + '-original-styles')); // then re-store the original styles
                }

                if(typeof $(_this).data(pluginname + '-original-styles') !== 'undefined'){
                    $(_this).removedata(pluginname + '-original-styles'); // remove data that stores the original stylings before the image being rendered
                }

                if(typeof $(_this).data(pluginname) !== 'undefined'){
                    $(_this).removedata(pluginname); // remove data that stored during plugin initialization
                }
            }
        },

        noncss3supported_method: function(_this, options){

            options.before.call(_this, _this);

            var that = this,
                $this = $(_this);

            $this.data(pluginname + '-original-styles', $this.attr('style')); // keep original styles into data

            $this.hide();

            var $tempimg = $("<img/>");

            $tempimg.bind('load', function(){
                var newimg = {
                        obj: $tempimg,
                        size: {
                            width: this.width,
                            height: this.height
                        }
                    },
                    pw = that.percentorpixel(options.width),
                    ph = that.percentorpixel(options.height),
                    imgcontainer = $('<div />'),
                    ratio = 0;

                $(imgcontainer)
                    .insertbefore($this)
                    .append($(newimg.obj))
                    .css({
                        'position' : 'relative',
                        'overflow' : 'hidden',
                        'width'    : (pw == '%') ? options.width : options.width + 'px',
                        'height'   : (ph == '%') ? options.height : options.height + 'px'
                    })
                    .data(pluginname, pluginname); // it would be easy to kill later

                if(newimg.size.width > newimg.size.height){ // horizontal

                    $(newimg.obj).css({
                        'width'      : 'auto',
                        'max-height' : 99999999,
                        'min-height' : 0,
                        'max-width'  : 99999999,
                        'min-width'  : 0,
                        'height'     : $(newimg.obj).parent().height() + 'px'
                    });

                    ratio = $(newimg.obj).height() / $(newimg.obj).width(); // get ratio

                    if( $(newimg.obj).width() < $(newimg.obj).parent().width() ){
                        $(newimg.obj).css({
                            'width': $(newimg.obj).parent().width(),
                            'height': parsefloat($(newimg.obj).parent().width() * ratio)
                        });
                    }

                }else{ // vertical

                    $(newimg.obj).css({
                        'width'      : $(newimg.obj).parent().width() + 'px',
                        'max-height' : 99999999,
                        'min-height' : 0,
                        'max-width'  : 99999999,
                        'min-width'  : 0,
                        'height'     : 'auto'
                    });

                    ratio = $(newimg.obj).width() / $(newimg.obj).height(); // get ratio

                    if( $(newimg.obj).height() < $(newimg.obj).parent().height() ){
                        $(newimg.obj).css({
                            'width': parsefloat($(newimg.obj).parent().height() * ratio),
                            'height': $(newimg.obj).parent().height()
                        });
                    }
                }

                postop = (that.percentorpixel(options.position.top) == '%') ? options.position.top : options.position.top + 'px';
                posleft = (that.percentorpixel(options.position.left) == '%') ? options.position.left : options.position.left + 'px';

                $(newimg.obj).css({
                    'position'    : 'absolute',
                    'top'         : postop,
                    'margin-top'  : (function(){
                                        if(that.percentorpixel(options.position.top) == '%'){
                                            return '-' + parsefloat(($(newimg.obj).height() / 100) * options.position.top.slice(0,-1)) + 'px';
                                        }
                                    })(),
                    'left'        : posleft,
                    'margin-left' : (function(){
                                        if(that.percentorpixel(options.position.left) == '%'){
                                            return '-' + parsefloat(($(newimg.obj).width() / 100) * options.position.left.slice(0,-1)) + 'px';
                                        }
                                    })()
                });

                $(imgcontainer)
                    .hide()
                    .addclass(options.classname);

                if(options.showoncomplete === true){
                    $(imgcontainer).show();
                }
                options.after.call(_this, $(imgcontainer));

                that.updateglobal(_this, $(imgcontainer), options);

            }).attr("src", $this.attr(options.source)); // for older browsers, must bind events first then set attr later (ie7, ie8)
        },

        css3supported_method: function (_this, options) {
            options.before.call(_this, _this);

            var that = this,
                $oriimage = $(_this),
                $tempimg = $('<img />').attr('src', $oriimage.attr(options.source));

            $oriimage.data(pluginname + '-original-styles', $oriimage.attr('style')); // keep original styles into data

            $oriimage.hide();

            $.each($tempimg, function(index, obj){
                var $tempimg = $(obj);

                $tempimg.one('load', function() {
                    var pw = that.percentorpixel(options.width),
                        ph = that.percentorpixel(options.height),
                        featuredbgimgcontainer = null,
                        featuredbgimg = null;

                    featuredbgimgcontainer = $('<div/>')
                                                .css({
                                                    'width'   : (pw == '%') ? options.width : options.width + 'px',
                                                    'height'  : (ph == '%') ? options.height : options.height + 'px',
                                                    'display' : 'none'
                                                })
                                                .addclass(options.classname)
                                                .data(pluginname, pluginname); // it would be easy to kill later

                    featuredbgimg = $('<div/>').css({
                        'width'              : '100%',
                        'height'             : '100%',
                        'background-image'   : 'url("' + $oriimage.attr(options.source) + '")',
                        // '-ms-filter'         : '"progid:dximagetransform.microsoft.alphaimageloader(src="' + $oriimage.attr(options.source) + '",sizingmethod="scale")', // this does not work in zepto
                        'background-repeat'  : 'no-repeat',
                        'background-position': (function(){
                            var postop = (that.percentorpixel(options.position.top) == '%') ? options.position.top : options.position.top + 'px',
                                posleft = (that.percentorpixel(options.position.left) == '%') ? options.position.left : options.position.left + 'px';
                            return postop + ' ' + posleft;
                        })(),
                        'background-size'    : 'cover'
                    })
                    .appendto($(featuredbgimgcontainer));

                    $(featuredbgimgcontainer).insertbefore($(_this));

                    if(options.showoncomplete === true){
                        $(featuredbgimgcontainer).show();
                    }

                    that.checksrcattrname(_this, options);

                    options.after.call(_this, $(featuredbgimgcontainer));

                    that.updateglobal(_this, $(featuredbgimgcontainer), options);
                });
            });
        },

        updateglobal: function(_this, obj, options){
            _this.global.outputelems.push( $(obj)[0] );
            _this.global.elemcounter++;
            grandglobal.outputelems.push( $(obj)[0] );
            if(_this.global.elemcounter == _this.global.inputelems.length){
                options.done.call(_this, _this.global.outputelems);
            }
        },

        checksrcattrname: function(_this, options){
            if(
                options.source != 'src' &&
                (
                    typeof $(_this).attr('src') === 'undefined' ||
                    $(_this).attr('src') === ''
                )
            )
            {
                $(_this).attr('src', $(_this).attr(options.source));
            }
        },

        percentorpixel: function(str){
            str = str.tostring();
            if(str.match("px$") || str.match("px$") || str.match("px$") || str.match("px$")) {
                return 'px';
            }else if(str.match("%$")) {
                return '%';
            }
        },

        support_css3_attr: (function() {
            /* code available at http://net.tutsplus.com/tutorials/html-css-techniques/quick-tip-detect-css-support-in-browsers-with-javascript/ */
            var div = document.createelement('div'),
                vendors = 'khtml ms o moz webkit'.split(' '),
                len = vendors.length;

            return function(prop) {
                if ( prop in div.style ) return true;

                prop = prop.replace(/^[a-z]/, function(val) {
                    return val.touppercase();
                });

                for(i=0; i<vendors.length; i++){
                    if ( vendors[i] + prop in div.style ) {
                        return true;
                    }
                }
                return false;
            };
        })()
    };

    $.fn[ pluginname ] = function ( options ) {

        var global = {
            elemcounter : 0,
            outputelems : [],
            inputelems  : (function(_this){
                                var $this   = $(_this),
                                    total   = $this.length,
                                    temparr = [];
                                for(var i=0; i<total; i++){
                                    temparr.push($this.get(i));
                                }
                                return temparr;
                            })($(this))
        };
        obj = {};
        obj[pluginname] = function(action){
            if(typeof action == 'undefined'){
                console.error('please specify an action like $.jqthumb("killall")');
                return;
            }
            action = action.tolowercase();
            if(action == 'killall'){
                $.each(grandglobal.inputelems, function(){
                    new plugin(this, 'kill');
                });
            }
        };
        $.extend($, obj);

        return this.each(function() {

            var $eachimg = $(this);
            this.global = global;

            grandglobal.inputelems.push($eachimg);

            if(typeof options == 'string'){
                new plugin(this, options);
            }else{
                if (!$eachimg.data(pluginname)){
                    $eachimg.data(pluginname, new plugin( this, options ));
                }else{ // re-rendered without killing it
                    new plugin(this, 'kill');
                    $eachimg.data(pluginname, new plugin( this, options ));
                }
            }
        });
    };

})( (window.jquery || window.zepto), window, document );