(function() {
    var kMinImageSize = 30;
    var kOutlineColor = "#1030cc";
    var kOutlineSize = 3;
    var kShadowSize = 7;
    var gAvailableImages = [];

    function bookmarklet() {
        if (byId("ff__container")) {
            return;
        }
        var selection;
        if (window.getSelection) {
            selection = '' + window.getSelection();
        } else if (document.selection) {
            selection = document.selection.createRange().text;
        }
        // Highlight all the images on the page
        var numImages = 0;
        var imageElements = window.ff__reshare ? [] : document.getElementsByTagName("img");
        for (var i = 0; i < imageElements.length; i++) {
            var image = imageElements[i];
            if (image.width < kMinImageSize || image.height < kMinImageSize) {
                continue;
            }
            numImages++;
            var listener = addEventListener(image, "mouseover", curry(onImageMouseOver, image));
            gAvailableImages.push({
                element: image,
                cursor: image.style.cursor,
                listener: listener
            });
        }
        // Create the share dialog in the corner of the window
        var container = div();
        container.id = "ff__container";
        container.style.position = "absolute";
        container.style.top = scrollPos().y + "px";
        container.style.right = "0";
        container.style.width = "auto";
        container.style.zIndex = 100000;
        var shadow = div(container);
        shadow.id = "ff__shadow";
        shadow.style.backgroundColor = "black";
        shadow.style.position = "absolute";
        shadow.style.zIndex = 0;
        shadow.style.top = "0";
        shadow.style.right = "0";
        setOpacity(shadow, 0.3);
        var foreground = div(container);
        foreground.id = "ff__foreground";
        foreground.style.backgroundColor = "white";
        foreground.style.zIndex = 2;
        foreground.style.width = "450px";
        foreground.style.height = "310px";
        foreground.innerHTML = '<iframe frameborder="0" id="ff__iframe" style="width:100%;height:100%;border:0px;padding:0px;margin:0px"></iframe>';
        document.body.appendChild(container);
        var msg = {
            title: document.title,
            url: location.href,
            parenturl: location.href
        };
        if (window.ff__reshare) {
            msg = {
                reshare: "1"
            };
            window.handleShareMessage = handleMessage;
        }
        msg.selection = selection || '';
        var links = document.getElementsByTagName('link');
        for (var i = 0; i < links.length; i++) {
            if (links[i].rel == 'image_src') {
                msg.image = links[i].href;
            } else if (links[i].rel == 'video_src') {
                msg.video = links[i].href;
            }
        }
        var metas = document.getElementsByTagName('meta');
        for (var i = 0; i < metas.length; i++) {
            if (metas[i].name == 'video_thumb') {
                msg.image = metas[i].content;
            }
        }
        if (location.host == 'www.theonion.com' && typeof (player) != "undefined" && typeof (player.playlist) != "undefined") {
            msg.video = player.playlist;
        }
        if (msg.image && msg.image.indexOf("http://www.comedycentral.com/sitewide/droplets/img_rez.jhtml") != -1) {
            msg.image = "http://www.comedycentral.com" + msg.image.slice(msg.image.indexOf('/', msg.image.indexOf('?')), msg.image.indexOf('&'));
        }
        // remove flickr overlays that obscure clicking the image
        if (location.host == 'www.flickr.com') {
            [].slice.call(document.querySelectorAll('.facade-of-protection-neue, a.navigate-target'))
                .forEach(function(node) { node.parentNode.removeChild(node) });
        }
        sendFrameMessage(msg);
        // Make a container for our "click to include" images
        var popupContainer = div();
        popupContainer.id = "ff__popup";
        popupContainer.style.position = "absolute";
        popupContainer.style.display = "none";
        popupContainer.style.left = "0px";
        popupContainer.style.top = "0px";
        popupContainer.style.zIndex = 99999;
        popupContainer.style.fontSize = "8pt";
        popupContainer.style.fontFamily = "Arial";
        popupContainer.style.fontStyle = "normal";
        popupContainer.style.fontWeight = "normal";
        popupContainer.style.background = "transparent";
        document.body.appendChild(popupContainer);
        // Size the shadow as the DIV changes
        var lastShadowWidth = 0;
        var lastShadowHeight = 0;

        function resizeShadow() {
            var shadow = byId("ff__shadow");
            var foreground = byId("ff__foreground");
            if (!shadow || !foreground) {
                clearInterval(interval);
                return;
            }
            if (lastShadowWidth != foreground.offsetWidth ||
                lastShadowHeight != foreground.offsetHeight) {
                lastShadowWidth = foreground.offsetWidth;
                lastShadowHeight = foreground.offsetHeight;
                shadow.style.width = (lastShadowWidth + kShadowSize) + "px";
                shadow.style.height = (lastShadowHeight + kShadowSize) + "px";
            }
        }
        var interval = window.setInterval(function () {
            checkForFrameMessage();
            resizeShadow();
        }, 50);
        resizeShadow();
        window.onscroll = function () {
            container.style.top = scrollPos().y + "px";
        };
    }

    function onImageMouseOver(image, e) {
        var popupContainer = byId("ff__popup");
        popupContainer.style.display = "none";
        clearNode(popupContainer);
        var clickTarget = div(popupContainer);
        clickTarget.style.position = "absolute";
        var offset = getOffset(image);
        clickTarget.style.left = (offset.left - kOutlineSize + 1) + "px";
        clickTarget.style.top = (offset.top - kOutlineSize + 1) + "px";
        clickTarget.style.width = image.width + "px";
        clickTarget.style.height = image.height + "px";
        clickTarget.style.border = kOutlineSize + "px solid " + kOutlineColor;
        clickTarget.style.cursor = "pointer";
        clickTarget.innerHTML = '<div style="margin:0;padding:0;width:100%;height:100%;position:relative;z-index:1;background-color:white;filter:alpha(opacity=1);opacity: 0.01"></div><div style="margin:0;position:absolute;top:0;left:0;background-color:white;padding:3px;color:#1030cc;border: 1px solid #1030cc;border-width: 0px 1px 1px 0px;z-index:2">' + 'Share image on FriendFeed' + '</div>';
        addEventListener(clickTarget, "click", curry(onImageClick, image));
        addEventListener(clickTarget, "mouseout", onHoverMouseOut);
        popupContainer.style.display = "";
        cancelEvent(e);
    }

    function onHoverMouseOut(e) {
        var popupContainer = byId("ff__popup");
        if (!popupContainer) return;
        for (var n = e.toElement || e.relatedTarget; n; n = n.parentNode)
            if (n == popupContainer) return; // moused over child
        clearNode(popupContainer);
        popupContainer.style.display = "none";
        cancelEvent(e);
    }

    function onImageClick(image, e) {
        cancelEvent(e);
        // work around flickr photos with notes
        if (image.src == "http://l.yimg.com/g/images/spaceball.gif")
            image = image.previousSibling;
        sendFrameMessage({
            image: image.src,
            w: image.width,
            h: image.height
        });
    }

    function addEventListener(instance, eventName, listener) {
        var listenerFn = listener;
        if (instance.addEventListener) {
            instance.addEventListener(eventName, listenerFn, false);
        } else if (instance.attachEvent) {
            listenerFn = function () {
                listener(window.event);
            }
            instance.attachEvent("on" + eventName, listenerFn);
        } else {
            throw new Error("Event registration not supported");
        }
        return {
            instance: instance,
            name: eventName,
            listener: listenerFn
        };
    }

    function removeEventListener(event) {
        var instance = event.instance;
        if (instance.removeEventListener) {
            instance.removeEventListener(event.name, event.listener, false);
        } else if (instance.detachEvent) {
            instance.detachEvent("on" + event.name, event.listener);
        }
    }

    function cancelEvent(e) {
        if (!e) e = window.event;
        if (e.preventDefault) {
            e.preventDefault();
        } else {
            e.returnValue = false;
        }
    }

    function scrollPos() {
        if (self.pageYOffset !== undefined) {
            return {
                x: self.pageXOffset,
                y: self.pageYOffset
            };
        }
        var d = document.documentElement;
        return {
            x: d.scrollLeft,
            y: d.scrollTop
        };
    }

    function setScrollPos(pos) {
        var e = document.documentElement,
            b = document.body;
        e.scrollLeft = b.scrollLeft = pos.x;
        e.scrollTop = b.scrollTop = pos.y;
    }

    function getOffset(obj) {
        var curleft = 0;
        var curtop = 0;
        if (obj.offsetParent) {
            curleft = obj.offsetLeft;
            curtop = obj.offsetTop;
            while (obj = obj.offsetParent) {
                curleft += obj.offsetLeft;
                curtop += obj.offsetTop;
            }
        }
        return {
            left: curleft,
            top: curtop
        };
    }

    function clearNode(node) {
        while (node.firstChild) {
            node.removeChild(node.firstChild);
        }
    }

    function removeNode(node) {
        if (node && node.parentNode) {
            node.parentNode.removeChild(node);
        }
    }

    function div(opt_parent) {
        var e = document.createElement("div");
        e.style.padding = "0";
        e.style.margin = "0";
        e.style.border = "0";
        e.style.position = "relative";
        if (opt_parent) {
            opt_parent.appendChild(e);
        }
        return e;
    }

    function curry(method) {
        var curried = [];
        for (var i = 1; i < arguments.length; i++) {
            curried.push(arguments[i]);
        }
        return function () {
            var args = [];
            for (var i = 0; i < curried.length; i++) {
                args.push(curried[i]);
            }
            for (var i = 0; i < arguments.length; i++) {
                args.push(arguments[i]);
            }
            return method.apply(null, args);
        }
    }

    function byId(id) {
        return document.getElementById(id);
    }

    function setOpacity(element, opacity) {
        if (navigator.userAgent.indexOf("MSIE") != -1) {
            var normalized = Math.round(opacity * 100);
            element.style.filter = "alpha(opacity=" + normalized + ")";
        } else {
            element.style.opacity = opacity;
        }
    }

    function sendFrameMessage(m) {
        var p = "";
        for (var i in m) {
            if (!m.hasOwnProperty(i))
                continue;
            p += (p.length ? '&' : '');
            p += encodeURIComponent(i) + '=' + encodeURIComponent(m[i]);
        }
        var iframe;
        iframe = byId("ff__iframe");
        if (!iframe) {
            iframe = frames["ff__iframe"];
        }
        // out of luck
        if (!iframe) return;
        if (iframe.contentWindow) {
            iframe = iframe.contentWindow;
        }
        var url = window.ff__reshare ? "" : 'https://friendfeed.com';
        url += '/share/bookmarklet/frame#' + p;
        try {
            iframe.location.replace(url);
        } catch (e) {
            iframe.location = url; // safari
        }
    }
    var gCurScroll = scrollPos();

    function checkForFrameMessage() {
        var prefix = "FFSHARE-";
        var hash = location.href.split('#')[1]; // location.hash is decoded
        if (!hash || hash.substring(0, prefix.length) != prefix) {
            gCurScroll = scrollPos(); // save pos
            return;
        }
        location.replace(location.href.split("#")[0] + "#");
        handleMessage(hash)
        var pos = gCurScroll;
        setScrollPos(pos);
        setTimeout(function () {
            setScrollPos(pos);
        }, 10);
    }

    function handleMessage(msg) {
        msg = msg.split('-');
        for (var i = 0; i < msg.length; i++)
            msg[i] = decodeURIComponent(msg[i]);
        switch (msg[1]) {
        case 'close':
            close(msg.slice(2));
            break;
        case 'frameh':
            byId("ff__foreground").style.height = msg[2] + "px";
            break;
        }
    }

    function close(args) {
        if (window["ff_reshare"]) {
            delete window["ff__reshare"];
        }
        window.onscroll = null; // TODO!
        for (var i = 0; i < gAvailableImages.length; i++)
            removeEventListener(gAvailableImages[i].listener);
        removeNode(byId("ff__popup"));

        function removeContainer() {
            removeNode(byId("ff__container"));
            return false;
        }
        if (!args || !args.length) {
            removeContainer();
            return;
        }
        var message = args[0].replace('<a ', '<a style="font-weight:bold;color:#1030cc" ');
        var foreground = byId("ff__foreground");
        clearNode(foreground);
        foreground.style.color = "black";
        foreground.style.padding = "4px 10px 4px 4px";
        foreground.style.font = "10pt Arial, sans-serif"
        foreground.style.fontStyle = "normal";
        foreground.style.fontWeight = "normal";
        foreground.style.width = "";
        foreground.style.height = "";
        foreground.innerHTML = '<img style="width:16px;height:16px;margin-bottom:-3px;margin-right:1px" src="http://friendfeed.com/static/images/icons/internal.png?v=e471e9afdf04ae568dcbddb5584fc6c0"> ' + message + ' <a href="#" id="ff__close" style="margin-left:1em;color:#1030cc">' + 'close' + '</a>';
        byId("ff__close").onclick = removeContainer;
        setTimeout(removeContainer, 3500);
    }
    if (document.getElementsByTagName('head').length == 0 ||
        frames.length > document.getElementsByTagName('iframe').length) {
        window.location.href = 'http://friendfeed.com/?link=' + escape(window.location.href);
    } else {
        bookmarklet();
    }
})();