$(document).ready(function(){
    var placeToCenter = true; // этот параметр отвечает за размещение картинки

    var bpOff = 0;
    var bpWidth = 0;
    var bpHeight = 0;
    var bpcLeft = 0;
    var bpcTop = 0;

    var zoomWidth = 0;
    var zoomHeight = 0;

    var width_array = new Array();
    var height_array = new Array();

    var screenWidth = 0;
    var screenHeight = 0;
    var screenScroll = 0;
    var scrLeft = 0;
    var scrTop = 0;

    var localTop = 0;
    var localLeft = 0;

    $("body").append('<div id="bigGrey"></div>\r<div class="zoomShadow"><table><tr><td class="zs1"><b></b></td><td class="zh1"><b></b></td><td class="zs2"><b></b></td></tr><tr><td class="zv1"><b></b></td><td><div class="zoomBase"></div></td><td class="zv2"><b></b></td></tr><tr><td class="zs3"><b></b></td><td class="zh2"><b></b></td><td class="zs4"><b></b></td></tr></table></div>\r');
    var zoomX = '<a href="#" class="zoomX"></a>\r';

    var firstClick = true;
    var galNum = 0;
    var oldZoom = 0;
    var currentZoom = 0;
    var oldW = 0;
    var oldH = 0;
    var oldOf = 0;
    var clicked = false;
    var strashno = false;
    var allLoaded = false;
    var loadStatus = 0;

    $("a.zoom").click(function(event) {
        event.preventDefault();
        $(this).blur();
        $("a.zoomX").remove();
        $("select").addClass("selOff");

        bpOff = $(this).offset();
        bpWidth = $(this).find("img").width();
        bpHeight = $(this).find("img").height();
        if(bpWidth === null) {
            bpWidth = $(this).width();
            bpHeight = $(this).height();
        }
        bpcLeft = Math.round(bpOff.left + (bpWidth / 2));
        bpcTop = Math.round(bpOff.top + (bpHeight / 2));

        screenScroll = $(window).scrollTop();
        screenWidth = $("body").innerWidth();
        screenHeight = $(window).height();

        scrLeft = Math.round(screenWidth / 2);
        scrTop = Math.round(screenScroll + (screenHeight / 2));

        if(firstClick === true) {
            galNum = $(".zoom").length;
            for(var i = 0; i < galNum; i++) {
                $(".zoom:eq(" + i + ")").addClass("myZoom" + i);
            }
            $("body").append('<img id="zoomLoading" src="/static/images/zoom-load.gif" />\r')
            $("#zoomLoading").css("left", bpcLeft - 11).css("top", bpcTop - 11);

            for(var i = 0; i < galNum; i++) {
                var zoomUrl = $(".myZoom" + i).attr("href");
                $("body").append('<img class="zoomPic" src="' + zoomUrl + "?" + Math.random()*10 +  '" id="zoomPic' + i + '" />\r')
            }

            currentZoom = $(this).attr("class").slice(11);
            oldZoom = currentZoom;

            for(var i = 0; i < galNum; i++) {
                $("#zoomPic" + i).load(function() {
                    loadStatus++;
                    var localId = $(this).attr("id").slice(7);
                    width_array[localId] = $(this).width();
                    height_array[localId] = $(this).height();
                });
            }

            var loading = setInterval(waitForPics, 50);
            firstClick = false;
        } else {
            oldZoom = currentZoom;
            currentZoom = $(this).attr("class").slice(11);
            showPic();
        }

        function waitForPics() {
            if(loadStatus === galNum) {
                $("#zoomLoading").remove();
                clearInterval(loading);
                showPic();
            }
        }
    });

    function showPic() {
        zoomWidth = width_array[currentZoom];
        zoomHeight = height_array[currentZoom];

        var ratio = zoomWidth / zoomHeight;

        //check size
        if(zoomHeight > screenHeight - 45) {
            zoomHeight = screenHeight - 45;
            zoomWidth = zoomHeight * ratio;
        } else if(zoomWidth > screenWidth - 50) {
            zoomWidth = screenWidth - 50;
            zoomHeight = zoomWidth / ratio;
        }

        oldW = $(".myZoom" + oldZoom + " img").width();
        oldH = $(".myZoom" + oldZoom + " img").height();
        oldOf = $(".myZoom" + oldZoom + " img").offset();
        if(oldW === null) {
            oldW = $(".myZoom" + oldZoom).width();
            oldH = $(".myZoom" + oldZoom).height();
            oldOf = $(".myZoom" + oldZoom).offset();
        }

        if(placeToCenter === false) {
            // in place

            //check place
            localTop = bpcTop - (zoomHeight / 2);
            if(localTop < screenScroll + 20) {localTop = screenScroll + 20};
            if(localTop + zoomHeight > screenScroll + screenHeight - 20) {localTop = screenScroll + screenHeight - zoomHeight - 20};
            localLeft = bpcLeft - (zoomWidth / 2);
            if(localLeft < 20) {localLeft = 20};
            if(localLeft > screenWidth - zoomWidth - 25) {localLeft = screenWidth - zoomWidth - 25};

            $("#zoomPic" + currentZoom).css("top", bpOff.top).css("left", bpOff.left).css("width", bpWidth).css("height", bpHeight);

            $("#zoomPic" + currentZoom).animate({
                width:zoomWidth,
                height:zoomHeight,
                left:localLeft,
                top:localTop
            }, 200, setShadow);

            if(currentZoom !== oldZoom && strashno === false) {
                removeShadow();
                $("#zoomPic" + oldZoom).animate({
                    width:oldW,
                    height:oldH,
                    left:oldOf.left,
                    top:oldOf.top
                }, 200, removeOld);
            }

            strashno = false;
        } else {
            // in center

            //check place
            localTop = (screenHeight / 2) - (zoomHeight / 2);
            localLeft = (screenWidth / 2) - (zoomWidth / 2);

            $("#bigGrey").addClass("bigGrey").height($("body > div").innerHeight());

            $("#zoomPic" + currentZoom).css("top", bpOff.top).css("left", bpOff.left).css("width", bpWidth).css("height", bpHeight);

            $("#zoomPic" + currentZoom).animate({
                width:zoomWidth,
                height:zoomHeight,
                left:localLeft,
                top:localTop
            }, 200, setShadow);

            if(currentZoom !== oldZoom && strashno === false) {
                removeShadow();
                $("#zoomPic" + oldZoom).animate({
                    width:oldW,
                    height:oldH,
                    left:oldOf.left,
                    top:oldOf.top
                }, 200, removeOld);
            }

            strashno = false;
        }
    };

    function setShadow() {
        clicked = false;
        var zsLeft = localLeft - 6;
        var zsTop = localTop - 6;
        $("div.zoomShadow").css("left", zsLeft).css("top", zsTop);
        $("div.zoomShadow div.zoomBase").width(zoomWidth - 8).height(zoomHeight - 8);

        for(var i = 0; i < galNum; i++) {
            if(i !== parseInt(currentZoom)) {
                $("#zoomPic" + i).css("top", -9999).css("left", 0).css("width", width_array[i]).css("height", height_array[i]);
            }
        }

        $("#zoomPic" + currentZoom).click(function(event){
            $("a.zoomX").remove();
            hideCurrent();
        });

        $("body").append(zoomX);
        $("a.zoomX").css("left", localLeft + zoomWidth - 16).css("top", localTop - 17);

        $("a.zoomX").click(function(event){
            event.preventDefault();
            $("a.zoomX").remove();
            hideCurrent();
        });
        $("select").addClass("selOff");
    }
    function removeShadow() {
        $("div.zoomShadow").css("top", -9999).css("left", 0);
    }

    function removeOld() {
        $("#zoomPic" + oldZoom).css("top", -9999).css("left", 0).css("width", width_array[oldZoom]).css("height", height_array[oldZoom]);
    }

    function hideCurrent() {
        if(clicked === false) {
            $("#bigGrey").removeClass("bigGrey").height(0);
            $("select").removeClass("selOff");
            oldZoom = currentZoom;

            oldWidth = width_array[oldZoom];
            oldHeight = height_array[oldZoom];

            oldW = $(".myZoom" + oldZoom + " img").width();
            oldH = $(".myZoom" + oldZoom + " img").height();
            oldOf = $(".myZoom" + oldZoom + " img").offset();
            if(oldW === null) {
                oldW = $(".myZoom" + oldZoom).width();
                oldH = $(".myZoom" + oldZoom).height();
                oldOf = $(".myZoom" + oldZoom).offset();
            }

            removeShadow();
            $("#zoomPic" + oldZoom).animate({
                width:oldW,
                height:oldH,
                left:oldOf.left,
                top:oldOf.top
            }, 200, removeOld);

            strashno = true;
        }
        clicked = true;
    }

    $("#bigGrey").click(function() {
        $("a.zoomX").remove();
        hideCurrent();
    });

    $(window).keydown(function(event) {
        if(event.keyCode == '27') {
            $("a.zoomX").remove();
            hideCurrent();
        }
        if(event.keyCode == '39' && galNum > 1) {
            removeShadow();
            $("a.zoomX").remove();
            oldZoom = currentZoom;

            if(firstClick === false) {
                if(currentZoom < galNum - 1) {
                    currentZoom++;
                } else {
                    currentZoom = 0;
                }
            }

            bpOff = $(".myZoom" + currentZoom).offset()
            bpWidth = $(".myZoom" + currentZoom).find("img").width();
            bpHeight = $(".myZoom" + currentZoom).find("img").height();
            if(bpWidth === null) {
                bpWidth = $(".myZoom" + currentZoom).width();
                bpHeight = $(".myZoom" + currentZoom).height();
            }
            bpcLeft = Math.round(bpOff.left + (bpWidth / 2));
            bpcTop = Math.round(bpOff.top + (bpHeight / 2));

            showPic();
        }
        if(event.keyCode == '37' && galNum > 1) {
            removeShadow();
            $("a.zoomX").remove();
            oldZoom = currentZoom;

            if(firstClick === false) {
                if(currentZoom > 0) {
                    currentZoom--;
                } else {
                    currentZoom = galNum - 1;
                }
            }

            bpOff = $(".myZoom" + currentZoom).offset()
            bpWidth = $(".myZoom" + currentZoom).find("img").width();
            bpHeight = $(".myZoom" + currentZoom).find("img").height();
            if(bpWidth === null) {
                bpWidth = $(".myZoom" + currentZoom).width();
                bpHeight = $(".myZoom" + currentZoom).height();
            }
            bpcLeft = Math.round(bpOff.left + (bpWidth / 2));
            bpcTop = Math.round(bpOff.top + (bpHeight / 2));

            showPic();
        }
    });
});