// ==UserScript==
// @name        ImageFAQs
// @namespace   FightingGames@gfaqs
// @include     http://www.gamefaqs.com
// @include     http://www.gamefaqs.com*
// @description Converts plain-text image and webm URLs into their embedded form
// @version     1.04
// @grant       GM_addStyle
// @grant       GM_getResourceText
// @grant       GM_log
// @require     http://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js
// @require     https://ajax.googleapis.com/ajax/libs/jqueryui/1.11.3/jquery-ui.min.js
// @resource    jqueryuibaseCSS https://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery.ui.base.css
// @resource    jqueryuithemeCSS https://code.jquery.com/ui/1.11.4/themes/cupertino/jquery-ui.css
// @downloadURL none
// ==/UserScript==

/* 
    The MIT License (MIT)

    This greasemonkey script for GameFAQs converts image and webm
    links into their embedded form. It can be considered as a spiritual successor
    to text-to-image for GameFAQs. Many of its features are inspired from appchan x
    by zixaphir at http://zixaphir.github.io/appchan-x/.
    
    Copyright (c) 2015 FightingGames@gamefaqs <adrenalinebionicarm@gmail.com>

    Permission is hereby granted, free of charge, to any person obtaining a copy
    of this software and associated documentation files (the "Software"), to deal
    in the Software without restriction, including without limitation the rights
    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
    copies of the Software, and to permit persons to whom the Software is
    furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included in
    all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    THE SOFTWARE.

*/



GM_addStyle (GM_getResourceText("jqueryuibaseCSS"));
GM_addStyle (GM_getResourceText("jqueryuithemeCSS"));
this.$ = this.jQuery = jQuery.noConflict(true);







/*this top portion of the script handles the settings box and local storage*/

var thumbnailImgWidth = 150;
var thumbnailImgHeight = 150;
var settingsJSON = localStorage.getItem("imagefaqs");        
var settings;       /*key-value array of JSON*/
var sessionSpoilersHotkey;

/*if imageFAQs was freshly installed*/
if (settingsJSON == null)
{
    settings = {
        enable_imagefaqs: true,
        enable_sigs: false,
        thumbnailWidth: thumbnailImgWidth,
        thumbnailHeight: thumbnailImgHeight,
        imgContainerBackgroundColor: "#DFE6F7",
        isSpoilersMode: false,
        spoilersHotkey: {115: 115},  /*F4*/
        blacklistStr: ""
    };
    
    localStorage.setItem("imagefaqs", JSON.stringify(settings));    /*save default settings*/
}
else 
{
    settings = jQuery.parseJSON(settingsJSON);
}






function keyCodeToString(keyCode)
{
    keyCode = parseInt(keyCode);
    
    if (keyCode == 16)
    {
        return "shift";
    }
    else if (keyCode == 17)
    {
        return "ctrl";
    }
    else if (keyCode == 18)
    {
        return "alt";
    }
    else if (keyCode >= 112 && keyCode <= 123)       /*F keys*/
    {
        return "F" + (keyCode - 111);
    }
    else
    {
        return String.fromCharCode(keyCode);
    }
}


function keyCodeKVArrayToString(array)
{
    var string = "";
    
    for (var key in array)
    {
        string += keyCodeToString(key) + " ";
    }
    
    return string;
}


function cloneKVArray(KVArray)
{
    var newKVArray = {};
    
    for (var key in KVArray)
    {
        newKVArray[key] = KVArray[key];
    }
    
    return newKVArray;
}



sessionSpoilersHotkey = cloneKVArray(settings.spoilersHotkey);




/*event where user opens up settings menu*/
$("body").on("click", "#imagefaqs_settings_but", function(event) {

    var popupBox = $("#imagefaqs_settings_popup");
    event.preventDefault();
    
    if (popupBox.length == 0)
    {
        $("body").append(
            "<div id='imagefaqs_settings_popup' title='ImageFAQs Settings. Version "+ GM_info.script.version+"'>" +
                "Update history: <a target='_blank' href='http://fightinggames.bitbucket.org/imagefaqs/'>http://fightinggames.bitbucket.org/imagefaqs/</a>." +
                "<br/>" +
                "Feedback and bug reporting: <a target='_blank' href='http://www.gamefaqs.com/boards/565885-blood-money'>http://www.gamefaqs.com/boards/565885-blood-money</a>." +
                "<br/><br/>" +
                "<label><input id='enableImagefaqs_checkbox' type='checkbox'>Enable ImageFAQs</label>" +
                "<br/>" +
                "<label><input id='enable_sigs_checkbox' type='checkbox'>Enable embedding in signatures</label>" +
                "<br/><br/>" +
                "<label><input id='thumbnailImgWidth_text' type='text'>Thumbnail max-width (150 default)</label>" +
                "<br/>" +
                "<label><input id='thumbnailImgHeight_text' type='text'>Thumbnail max-height (150 default)</label>" +
                "<br/><br/>" +
                "<label><input id='imgContainerBackgroundColor_text' type='text'>Image container background color (#DFE6F7 default)</label>" +
                "<br/><br/>" +
                "<label>Newline separated list of blacklisted image URLs</label>" +
                "<br/>" +
                "<textarea id='blacklist_text'></textarea>" +
                "<br/><br/>" +
                "<span>Tip: You can blacklist an entire domain (e.g. pbsrc.com)</span>" +
                "<br/><br/>" +
                "<label><input id='spoilersHotkey_text' type='text'>Toggle spoilers hotkey (F4 default)</label>" +
                "<br/><br/>" +
                "<span>Tip: At any time, you can toggle spoilers mode. This can be done before or after<br/> entering a topic.</span>" +
                "<br/><br/>" +
                "<button id='saveImagefaqsSettingsBut' type='button'>Save</button> " +
                "<button id='cancelImagefaqsSettingsBut' type='button'>Cancel</button> " +
                "<br/><br/>" +
                "<span id='responseSpan'>&nbsp;</span>" +     /*for reporting success or failure*/
            "</div>"
        );
        
        popupBox = $("#imagefaqs_settings_popup");
    }

    popupBox.find("#enableImagefaqs_checkbox").prop("checked", settings.enable_imagefaqs);
    popupBox.find("#enable_sigs_checkbox").prop("checked", settings.enable_sigs);
    popupBox.find("#thumbnailImgWidth_text").val(settings.thumbnailWidth);
    popupBox.find("#thumbnailImgHeight_text").val(settings.thumbnailHeight);
    popupBox.find("#imgContainerBackgroundColor_text").val(settings.imgContainerBackgroundColor);
    popupBox.find("#spoilersHotkey_text").val( keyCodeKVArrayToString(settings.spoilersHotkey) );
    popupBox.find("#blacklist_text").val( settings.blacklistStr );
    $("#imagefaqs_settings_popup").children("#responseSpan").html("&nbsp;");

    $("#imagefaqs_settings_popup").dialog({
        width:'auto'
    });
});





$("body").on("click", "#saveImagefaqsSettingsBut", function(event) {

    event.preventDefault();
    
    var settingsPopup = $("#imagefaqs_settings_popup");
   
    /*if valid thumbnail dimensions*/
    if (
        !isNaN($("#thumbnailImgWidth_text").val()) && $("#thumbnailImgWidth_text").val() >= 1 &&
        !isNaN($("#thumbnailImgHeight_text").val()) && $("#thumbnailImgHeight_text").val() >= 1)
    {
        settings.thumbnailWidth = $("#thumbnailImgWidth_text").val();
        settings.thumbnailHeight = $("#thumbnailImgHeight_text").val();
    }
    else 
    {
        reportResponseMsgInImagefaqsSettingsPopupBox("Error: Invalid thumbnail dimensions. Use natural numbers only.", settingsPopup);
        return;
    }
    
    /*if valid image container background color*/
    if (settingsPopup.find("#imgContainerBackgroundColor_text").val().search(/^#[a-zA-Z0-9]{6}$/i) >= 0)
    {
        settings.imgContainerBackgroundColor = settingsPopup.find("#imgContainerBackgroundColor_text").val();
    }
    else 
    {
        reportResponseMsgInImagefaqsSettingsPopupBox("Error: Invalid image container background color.", settingsPopup);
        return;
    }
    
    settings.enable_imagefaqs = settingsPopup.find("#enableImagefaqs_checkbox").prop("checked");
    settings.enable_sigs = settingsPopup.find("#enable_sigs_checkbox").prop("checked");
    settings.spoilersHotkey = cloneKVArray(sessionSpoilersHotkey);
    settings.blacklistStr = settingsPopup.find("#blacklist_text").val();
    
    localStorage.setItem("imagefaqs", JSON.stringify(settings));
    
    reportResponseMsgInImagefaqsSettingsPopupBox("Settings saved. Please refresh page for changes to take effect.", settingsPopup);
});



/*
@param msg :: message string to show to the user
@param box :: $("#imagefaqs_settings_popup")
*/
function reportResponseMsgInImagefaqsSettingsPopupBox(msg, box)
{
    var msgBox = box.children("#responseSpan");
    
    msgBox.html(msg);
    msgBox.effect("highlight");
}



$("body").on("click", "#cancelImagefaqsSettingsBut", function(event) {

    event.preventDefault();
    $("#imagefaqs_settings_popup").dialog("close");
});






/*begin main scripting*/
(function(){

var enable_imagefaqs = settings.enable_imagefaqs;
var isSpoilersMode = settings.isSpoilersMode;
var thumbnailImgWidth = settings.thumbnailWidth;
var thumbnailImgHeight = settings.thumbnailHeight;
var blacklist = settings.blacklistStr.split("\n");    /*array of URLs to block*/
var currentURL;
var pageType;       /* "topic" or "postPreview" or "other" */
var allowImgInSig = settings.enable_sigs;
var isFloatingImgExist = false;
var floatingImgWidth;
var floatingImgRightOffset = 50;
var floatingImgBorder = 10;
var currentHoveredThumbnail = null;
var imgAnchorTags = [];





var heldDownKeys = {};
$("body").on("keydown", "#imagefaqs_settings_popup #spoilersHotkey_text", function(event){
   
    heldDownKeys[event.which] = event.which;
    sessionSpoilersHotkey = cloneKVArray(heldDownKeys);
    
    $(this).val(
        keyCodeKVArrayToString(sessionSpoilersHotkey)
    );
    
    return false;
});


$("body").on("keyup", "#imagefaqs_settings_popup #spoilersHotkey_text", function(event){
    delete heldDownKeys[event.which];
    return false;
});

$("body").on("keypress", "#imagefaqs_settings_popup #spoilersHotkey_text", function(event){
    event.preventDefault();
});







$("body").keydown(function(event){

    var desiredAction;
    heldDownKeys[event.which] = event.which;

    /*are every spoilers hotkey pressed?*/
    for (var key in settings.spoilersHotkey)
    {
        if (settings.spoilersHotkey[key] != heldDownKeys[key])
        {
            return;
        }
    }
    desiredAction = "toggleSpoilersMode";
    
    if (desiredAction == "toggleSpoilersMode")
    {
        event.preventDefault();
        
        isSpoilersMode = !isSpoilersMode;

        if (isSpoilersMode)
        {
            if (pageType != "other")
            {
                /*for every embedded image*/
                $(".embeddedImg").each(function(index, element) {
            
                    /*if image is in thumbnail mode, add spoilers class*/
                    if ($(this).hasClass("thumbnailImg"))
                    {
                        $(this).addClass("thumbnailImg_spoilersExt");
                        $(this).parent().addClass("embeddedImgAnchor_spoilersExt");
                    }
                });
            }
        
            showNotification("ImageFAQs: Spoilers mode is now on.");
        }
        else 
        {
            if (pageType != "other")
            {
                /*for every embedded image*/
                $(".embeddedImg").each(function(index, element) {
            
                    /*if image is in thumbnail mode, remove spoilers class*/
                    if ($(this).hasClass("thumbnailImg"))
                    {
                        $(this).removeClass("thumbnailImg_spoilersExt");
                        $(this).parent().removeClass("embeddedImgAnchor_spoilersExt");
                    }
                });
            }
            
            showNotification("ImageFAQs: Spoilers mode is now off.");
        }
        
        settings.isSpoilersMode = isSpoilersMode;
        localStorage.setItem("imagefaqs", JSON.stringify(settings));
    }
});




$("body").keyup(function(event){
    delete heldDownKeys[event.which];
});







/*
Display a notification on the bottom-right of the browser. Notification will 
disappear in a few seconds.

@param msg :: string message to display
*/
function showNotification(msg)
{
    var notificationBox = $("#imagefaqs_notificationBox");
    notificationBox.remove();
    
    $("body").append(
        "<div id='imagefaqs_notificationBox'>" +
            "<span style='color: black'>" +
                msg +
            "</span>" +
        "</div>"
    );
    
    notificationBox = $("#imagefaqs_notificationBox");

    notificationBox.css({
        "background-color": "white",
        "position": "absolute",
        "top": ($(window).scrollTop() + $(window).height() - notificationBox.height())+"px",
        "left": ($(window).scrollLeft() + $(window).width() - notificationBox.find("span").width())+"px"
    });

    notificationBox.effect("highlight").delay(1000).fadeOut(500);
}




if (enable_imagefaqs == false)
{
    return;
}



if (blacklist.length == 1 && blacklist[0] == "")
{
    blacklist = [];
}
else 
{
    /*trim white space*/
    for (var i = 0; i < blacklist.length; i++)
    {
        blacklist[i].trim();
    }
}







function isURLmatchBlacklistedURL(url, blacklistedURL)
{
    blacklistedURL = blacklistedURL.trim();
    
    /*escape everything*/
    var blacklistedURLregex = 
        new RegExp( blacklistedURL.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&") );

    if (blacklistedURLregex.exec(url) != null)
    {
        return true;
    }
    else
    {
        return false;
    }
}


/*
Is the url string in the blacklist?

@url :: string of the url to check 
@blacklist :: array of blacklisted urls

Returns true or false
*/
function isURLinBlacklist(url, blacklist)
{
    for (var i = 0; i < blacklist.length; i++)
    {
        if (isURLmatchBlacklistedURL(url, blacklist[i]))
        {
            return true;
        }
    }
    
    return false;
}








currentURL = window.location.href;
pageType = currentURL.search(/.*gamefaqs\.com\/boards\/.*\/.*/i);
if (currentURL.search(/.*gamefaqs\.com\/boards\/.*\/.*/i) >= 0)
{
    pageType = "topic";
}
else if (currentURL.search(/.*gamefaqs\.com\/boards\/post/i) >= 0)
{
    pageType = "postPreview";
}
else if (currentURL.search(/.*gamefaqs\.com\/user/i) >= 0)
{
    /*add settings link*/
    $(".systems").append("<li><a id='imagefaqs_settings_but' href='#'>ImageFAQs Options</a> - Change thumbnail size, enable signature embedding, and more.</li>");
}
else 
{
    pageType = "other";
}




if (pageType == "other")
{
    return;
}







GM_addStyle ("\
    .embeddedImgContainer {\
        background: "+settings.imgContainerBackgroundColor+";\
    }\
    .embeddedImgAnchor {\
        display: inline-block;\
    }\
    .embeddedImgAnchor_placeholderHeight {\
        height: "+thumbnailImgHeight+"px;\
    }\
    .embeddedImgAnchor_spoilersExt {\
        background: black;\
    }\
    .thumbnailImg {\
        display: inline-block; /*prevents parent anchor from stretching horizontally*/\
        vertical-align: bottom;\  /*eliminates small gap between bottom of image and parent div*/\
    }\
    .thumbnailImg_spoilersExt {\
        opacity: 0.0;\
    }\
    .expandedImg {\
        display: inline-block;\
        vertical-align: bottom;\
    }\
");

$("body").css("position", "relative");

if (pageType == "topic")
{
    /*get all user posts*/
    var posts = $(".msg_body");
}
else if (pageType == "postPreview")
{
    var posts = $("div.body td:eq(1)");
}

/*for each user post*/
posts.each(function(index, element) {
    
    var postHtml;
    var unanchoredImgURLMatches;
    var sigStrIdx;
    var anchorTags;
    
    postHtml = $(this).html();
    
    /*if in post preview mode, need to manually parse through the preview message body and 
    replace every plain-text image URL in its anchor form*/
    if (pageType == "postPreview")
    {
        postHtml = postHtml.replace(/https?:\/\/[a-zA-Z0-9\[\]\-\.\_\~\:\/\?\#\[\]\%\@\!\$\&\'\(\)\*\+\,\;\=]*?\.(?:png|jpg|gif|jpeg|webm|gifv)[a-zA-Z0-9\[\]\-\.\_\~\:\/\?\#\[\]\%\@\!\$\&\'\(\)\*\+\,\;\=]*/ig, "<a href='$&'>$&</a>");
        
        $(this).html(postHtml);
    }
    
    /*get index of sig separator*/
    sigStrIdx = postHtml.indexOf("<br>---<br>");
    
    /*get all anchor tags*/
    anchorTags = $(this).find("a");
    
    /*filter in anchor tags that refer to images*/
    anchorTags.each(function(index, element) {
        
        var anchorURL = $(this).attr("href");
        var anchorTagStrIdx = postHtml.indexOf(anchorURL);

        if (anchorURL.search(/https?:\/\/[a-zA-Z0-9\[\]\-\.\_\~\:\/\?\#\[\]\%\@\!\$\&\'\(\)\*\+\,\;\=]*?\.(?:png|jpg|gif|jpeg|webm|gifv)/i) >= 0)
        {
            /*if sig exists, anchor is part of sig, and sig shouldn't embedded images*/
            if (sigStrIdx != -1 && anchorTagStrIdx > sigStrIdx && !allowImgInSig)
            {
                return;
            }
            
            imgAnchorTags.push($(this));
        }
    });
});



/*for each valid image URL anchor tag, replace with template div for embedded image*/
for (var imgAnchor of imgAnchorTags)
{
    var imgURL = imgAnchor.html();
    var imgSize;
    var imgInfoEleStr;
    var postID;
    var isBlacklisted = isURLinBlacklist(imgURL, blacklist);
    
    if (pageType == "topic")
    {
        postID = imgAnchor.parent().attr("name");
    }
    else    /*if in post preview mode, need to provide missing message ID*/ 
    {
        imgAnchor.parent().attr("name", 0);
        postID = 0;
    }
    
    imgInfoEleStr = 
        "<span style='margin-right: 5px'>" +
            "<a href="+imgURL+">"+imgURL+"</a>" +
        "</span>";
    
    imgGoogleReverse = 
        "<a target='_blank' title='Reverse image search on general images' style='margin-right: 5px' href='https://www.google.com/searchbyimage?image_url="+imgURL+"'>" +
            "google" +
        "</a>";
        
    imgIQDBreverse = 
        "<a target='_blank' title='Reverse image search on weeb images' style='margin-right: 5px' href='http://iqdb.org/?url="+imgURL+"'>" +
            "iqdb" +
        "</a>";
        
    if (isBlacklisted)
    {
        imgBlacklistToggle =
            "<a class='imgBlacklistToggle' href='#' title='Whitelist image' style='margin-right: 5px'>whitelist</a>"; 
    }
    else 
    {
        imgBlacklistToggle =
            "<a class='imgBlacklistToggle' href='#' title='Blacklist image' style='margin-right: 5px'>blacklist</a>"; 
    }
    
    imgCloseAll =
        "<a class='imgCloseAll' href='#' title='Close all images in page' style='margin-right: 5px'>&lt;&lt;</a>";
    
    imgClosePost =
        "<a class='imgClosePost' href='#' data-postID='"+postID+"' title='Close all images in post' style='margin-right: 5px'>&lt;</a>";
    
    imgExpandPost = 
        "<a class='imgExpandPost' href='#' data-postID='"+postID+"' title='Expand all images in post' style='margin-right: 5px'>&gt;</a>";
    
    imgExpandAll =
        "<a class='imgExpandAll' href='#' title='Expand all images in page' style='margin-right: 5px'>&gt;&gt;</a>";
        
    imgAnchor.replaceWith(
        "<div class='embeddedImgContainer'>" +
            imgInfoEleStr +
            imgGoogleReverse +
            imgIQDBreverse +
            imgBlacklistToggle +
            imgCloseAll + 
            imgClosePost + 
            imgExpandPost +
            imgExpandAll +
            "<br/>" +
            "<a class='embeddedImgAnchor embeddedImgAnchor_placeholderHeight' href='" + imgURL + "' data-backup-href='" + imgURL + "'>" +
            "</a>" +
        "</div>"
    );
    
    if (isBlacklisted)
    {
        var embeddedImgAnchor = $(".embeddedImgAnchor[href='"+imgURL+"']");
        
        embeddedImgAnchor.hide();
        embeddedImgAnchor.addClass("blacklisted");
    }
}


/*for each template div, insert an embedded image*/
$(".embeddedImgContainer").each(function(index, element) {
    
    var curEmbeddedImgContainer = $(this);
    var curEmbeddedImgAnchor = $(this).find(".embeddedImgAnchor");
    var imgURL = curEmbeddedImgAnchor.attr("href");
    var imgType;    /*e.g. "jpg"*/
    var image = new Image();
    var embeddedImgSpoilersClass;
    
    if (isSpoilersMode)
    {
        embeddedImgSpoilersClass = "thumbnailImg_spoilersExt";
        curEmbeddedImgAnchor.addClass("embeddedImgAnchor_spoilersExt");
    }
    else 
    {
        embeddedImgSpoilersClass = "";
    }
    
    var postID = curEmbeddedImgContainer.parent().attr("name");
    
    imageType = imgURL.split(".").pop();
    
    /*if not a webm video (i.e. image)*/
    if (imageType.search(/(webm|gifv)/i) == -1)
    {
        /*on event that image cannot be loaded, post the error*/
        image.onerror = function() {
            curEmbeddedImgAnchor.html("Image cannot be loaded.");
            curEmbeddedImgAnchor.removeClass("embeddedImgAnchor_placeholderHeight");
        };
        
        /*on event that image loaded successfully in memory*/
        $(image).load(function() {
            /*write down image's natural dimensions*/
            curEmbeddedImgContainer.find("span").append(
                " (" + image.naturalWidth + "x" + image.naturalHeight + ")"
            );
            curEmbeddedImgAnchor.removeClass("embeddedImgAnchor_placeholderHeight");
        });
        
        image.src = imgURL;
        
        $(image).addClass("embeddedImg thumbnailImg "+embeddedImgSpoilersClass+"");
        $(image).attr("data-postID", postID);
        $(image).attr("alt", "");
        $(image).css("max-width", thumbnailImgWidth + "px");
        $(image).css("max-height", thumbnailImgHeight + "px");
        
        curEmbeddedImgAnchor.html(image);
    }
    else    /*if image is actually a webm file*/
    {
        if (imageType == "gifv")
        {
            imgURL = imgURL.replace("gifv", "webm");
        }   
        
        htmlVideoSrcTag =
            "<video id='embeddedImg_"+index+"' data-postID='"+postID+"' " +
            "class='embeddedImg webmExt thumbnailImg "+embeddedImgSpoilersClass+"' " +
            "style='max-width: "+thumbnailImgWidth+"px; max-height: "+thumbnailImgHeight+"px;'>" +
                "<source src='" + imgURL + "' type='video/webm'>" +
            "</video>"; 
               
        curEmbeddedImgAnchor.html(
            htmlVideoSrcTag
        );
        
        curEmbeddedImgAnchor.removeClass("embeddedImgAnchor_placeholderHeight"); 
        
        /*when video's metadata has been loaded, record its natural width and resolution*/
        $("#embeddedImg_"+index+"")[0].onloadedmetadata = function() {
            
            var video = this;
            
            $(video).parent().parent().find("span").append(
                " (" + video.videoWidth + "x" + video.videoHeight + ")"
            );
        };
        
        /*when video's metadata has been loaded, record its natural width and resolution*/
        $("#embeddedImg_"+index+"")[0].addEventListener('error', function(event) {
            curEmbeddedImgAnchor.html("Video cannot be loaded.");
        }, true);
    }
});


/*
Get the natural width of an embedded image.

@image :: jQuery object with the class "embeddedImg"
*/
function getNatWidthOfEmbeddedImg(image)
{
    if (image.hasClass("webmExt"))
    {
        return image[0].videoWidth;
    }
    else 
    {
        return image[0].naturalWidth;
    }
}



/*
Get the natural width of an embedded image.

@image :: jQuery object with the class "embeddedImg"
*/
function getNatHeightOfEmbeddedImg(image)
{
    if (image.hasClass("webmExt"))
    {
        return image[0].videoHeight;
    }
    else 
    {
        return image[0].naturalHeight;
    }
}



/*if cursor is hovering inside a thumbnail image, display expanded image as floating div*/
$(document).on("mousemove", function(event) {
    
    var floatingImgLeft;
    var floatingImgTop;
    var floatingImgWidth;
    var floatingImgHeight;
    var floatingImgStyleStr;
    
    /*if user is hovering over thumbnail, prepare floating image size and position*/
    if (currentHoveredThumbnail != null)
    {
        floatingImgWidth = parseInt(getNatWidthOfEmbeddedImg(currentHoveredThumbnail));

        floatingImgLeft = event.pageX + floatingImgRightOffset;
        
        /*if right of image exceeds beyond right of window, restrict max width*/
        if (floatingImgLeft + floatingImgWidth > $(window).scrollLeft() + $(window).width() - floatingImgBorder)
        {
            floatingImgWidth = $(window).scrollLeft() + $(window).width() - floatingImgBorder - floatingImgLeft;
        }
        
        floatingImgHeight = Math.round(getNatHeightOfEmbeddedImg(currentHoveredThumbnail) * (floatingImgWidth / getNatWidthOfEmbeddedImg(currentHoveredThumbnail)));
        
        floatingImgTop = event.pageY - (floatingImgHeight / 2);
        
        /*if bottom of image exceeds beyond the window, shift top upwards*/
        if (floatingImgTop + floatingImgHeight > $(window).scrollTop() + $(window).height() - floatingImgBorder)
        {
            floatingImgTop = $(window).scrollTop() + $(window).height() - floatingImgBorder - floatingImgHeight;
        }
        
        /*if top of image expands beyond top of window, lower top of image*/
        if (floatingImgTop < $(window).scrollTop() + floatingImgBorder)
        {
            floatingImgTop = $(window).scrollTop() + floatingImgBorder;
        }
        
        /*if bottom of image exceeds beyond the window, restrict max height*/
        if (floatingImgTop + floatingImgHeight > $(window).scrollTop() + $(window).height() - floatingImgBorder)
        {
            floatingImgHeight = $(window).scrollTop() + $(window).height() - floatingImgBorder - floatingImgTop;
        }
        
        /*if floating image doesn't exist, create it*/
        if (!isFloatingImgExist)
        {
            floatingImgStyleStr = 
                "position: absolute;" +
                "left: " + floatingImgLeft + "px;" +
                "top: " + floatingImgTop + "px;" +
                "max-width: " + floatingImgWidth + "px;" +
                "max-height: " + floatingImgHeight + "px;" +
                "z-index: 100;";
            
            /*if webm video*/
            if (currentHoveredThumbnail.hasClass("webmExt"))
            {
                floatingImgSrc = 
                    "<video id='floatingImg' style='" + floatingImgStyleStr + "'>" +
                        "<source src='" + currentHoveredThumbnail.children("source").attr("src") + "' type='video/webm'>" +
                    "</video>";
            }
            else 
            {
                floatingImgSrc = 
                    "<img id='floatingImg' style='" + floatingImgStyleStr + "' src='" + currentHoveredThumbnail.attr("src") + "'>";
            }
            
            isFloatingImgExist = true;
            
            /*create the floating image*/
            $("body").append(
                floatingImgSrc
            );
            
            /*if webm video*/
            if (currentHoveredThumbnail.hasClass("webmExt"))
            {
                var video = $("#floatingImg");

                video.attr("loop", "");
                video[0].play();
            }
        }
        else    /*if floating image already exists, update its size and position*/
        {
            $("#floatingImg").css({
                "left": floatingImgLeft + "px",
                "top": floatingImgTop + "px",
                "max-width": floatingImgWidth + "px",
                "max-height": floatingImgHeight + "px",
            });
        }
    }
    /*if user is not hovering over thumbnail and floating image still exists*/
    else if (currentHoveredThumbnail == null && isFloatingImgExist)
    {
        $("#floatingImg").remove();
        isFloatingImgExist = false;
    }
});



/*if mouse hovers inside the image, change cursor to pointer*/
$(document).on("mouseover", ".embeddedImg", function(event){
    $("html").css("cursor", "pointer");
    
    if (! $(this).hasClass("expandedImg"))
    {
        currentHoveredThumbnail = $(event.target);
    }
});

/*if mouse hovers outside the image, restore cursor to default graphic*/
$(document).on("mouseout", ".embeddedImg", function(){
    $("html").css("cursor", "default");
    
    currentHoveredThumbnail = null;
});



/*if clicked on the image URL anchor that's surrounding the embedded image, prevent default
behaviour of anchor, unless it's a middle click*/
$("body").on("click", ".embeddedImgAnchor", function(event){
    
    /*left-click*/
    if (event.which == 1)
    {
        
    }
    else 
    {
        $(this).attr("href", $(this).attr("data-backup-href"));
    }
});

$("body").on("mousedown", ".embeddedImgAnchor", function(event){
    
    /*left-click*/
    if (event.which == 1)
    {
        event.preventDefault();
    }
    else 
    {
        $(this).attr("href", $(this).attr("data-backup-href"));
    }
});


/*toggle image size on left-click*/
$("body").on("click", ".embeddedImg", function(event){
    
    /*left-click*/
    if (event.which == 1)
    {
        var mouseRelativeY = event.pageY - $(this).offset().top;
        
        /*if expanded webm file, don't shrink to thumbnail if clicked on its controls*/
        if ($(this).hasClass("webmExt") && $(this).hasClass("expandedImg") &&
             (mouseRelativeY > ($(this).height() - 28)))
        {
            $(this).parent().attr("href", "javascript:void(0);");
        }
        else
        {
            toggleEmbeddedImgSize($(this));
            $(window).scrollTop( $(this).parent().parent().offset().top );
            
            return false;
        }
    }
});



function toggleEmbeddedImgSize(embeddedImg)
{
    if (isSpoilersMode)
    {
        /*if going to be expanded*/
        if (embeddedImg.hasClass("thumbnailImg"))
        {
            embeddedImg.removeClass("thumbnailImg_spoilersExt");
            embeddedImg.parent().removeClass("embeddedImgAnchor_spoilersExt");
        }
        else    /*if going to be in thumbnail mode*/
        {
            embeddedImg.addClass("thumbnailImg_spoilersExt");
            embeddedImg.parent().addClass("embeddedImgAnchor_spoilersExt");
        }
    }
    
    embeddedImg.toggleClass("thumbnailImg expandedImg");
    
    /*if expanded*/
    if (embeddedImg.hasClass("expandedImg"))
    {
        currentHoveredThumbnail = null;
        $("#floatingImg").remove();
        isFloatingImgExist = false;

        embeddedImg.css("max-width", getOptimalExpandedImgMaxWidth(embeddedImg));
        embeddedImg.css("max-height", "");
        
        /*if webm file, start playing it*/
        if (embeddedImg.hasClass("webmExt"))
        {
            embeddedImg[0].play();
            embeddedImg.attr("controls", "");
        }
    }
    else    /*if shrinking image back to thumbnail*/
    {
        embeddedImg.css("max-width", thumbnailImgWidth + "px");
        embeddedImg.css("max-height", thumbnailImgHeight + "px");
        
        /*if webm file, stop playing it*/
        if (embeddedImg.hasClass("webmExt"))
        {
            embeddedImg[0].pause();
            embeddedImg.removeAttr("controls");
        }
    }
}



/*
Get the optimal max-width for an expanded image.

The width will either be the length between the left of the thumbnail and the 
right of the image container, or the length between the left of the thumbnail
and right of the window size.

@param thumbnailImg :: jQuery object of the image to be expanded. It has the
class "thumbnailImg"

The returned width will be the smaller of the two.
*/
function getOptimalExpandedImgMaxWidth(thumbnailImg)
{
    var toContainerWidth;
    var toWindowWidth;
    
    toContainerWidth = 
        thumbnailImg.parent().parent().width();
        
    toWindowWidth =
        $(window).width() - thumbnailImg.offset().left;
        
    if (toContainerWidth > toWindowWidth)
    {
        return toWindowWidth;
    }
    else 
    {
        return toContainerWidth;
    }
}












$("body").on("click", ".imgCloseAll", function(event) {
    
    event.preventDefault();
    
    /*for every expanded embedded image*/
    $(".embeddedImg.expandedImg").each(function(index, element) {
        
        toggleEmbeddedImgSize($(this));
    });
    
    $(window).scrollTop( $(this).parent().offset().top );
});


$("body").on("click", ".imgClosePost", function(event) {
    
    var postID = $(this).attr("data-postID");
    
    event.preventDefault();
    
    /*for every expanded embedded image with same post ID*/
     $(".embeddedImg[data-postID="+postID+"].expandedImg").each(function(index, element) {
        
        toggleEmbeddedImgSize($(this));
    });
    
    $(window).scrollTop( $(this).parent().offset().top );
});


$("body").on("click", ".imgExpandPost", function(event) {
    
    var postID = $(this).attr("data-postID");

    event.preventDefault();
    
    /*for every embedded image with same post ID*/
    $(".embeddedImg[data-postID='"+postID+"']").each(function(index, element) {
        
        /*if image already expanded*/
        if ($(this).hasClass("expandedImg"))
        {
            /*update its max-width*/
            $(this).css("max-width", getOptimalExpandedImgMaxWidth($(this)))
        }
        else 
        {
            toggleEmbeddedImgSize($(this));
        }
    });
    
    $(window).scrollTop( $(this).parent().offset().top );
});



$("body").on("click", ".imgExpandAll", function(event) {
    
    event.preventDefault();
    
    /*for every embedded image*/
    $(".embeddedImg").each(function(index, element) {
        
        /*if image already expanded*/
        if ($(this).hasClass("expandedImg"))
        {
            /*update its max-width*/
            $(this).css("max-width", getOptimalExpandedImgMaxWidth($(this)))
        }
        else 
        {
            toggleEmbeddedImgSize($(this));
        }
    });
    
    $(window).scrollTop( $(this).parent().offset().top );
});










$("body").on("click", ".imgBlacklistToggle", function(event) {
    
    event.preventDefault();
    
    var url = $(this).siblings(".embeddedImgAnchor").attr("href");
    url.trim();
    
    /*if image isn't blacklisted (but going to blacklist)*/
    if (! $(this).siblings(".embeddedImgAnchor").hasClass("blacklisted"))
    {
        blacklist.push(url);
        
        /*for every embedded image anchor*/
        $(".embeddedImgAnchor").each(function(index, element) {
            
            /*if has URL that was just blacklisted, hide it*/
            if (isURLmatchBlacklistedURL(url, $(this).attr("href")))
            {
                $(this).siblings(".imgBlacklistToggle").html("whitelist");
                $(this).siblings(".imgBlacklistToggle").attr("title", "Whitelist image");
                $(this).addClass("blacklisted");
                $(this).hide();
            }
        });
    }
    else /*if image is blacklisted (but going to whitelist)*/
    {
        /*remove url from blacklist*/        
        var urlIdx = blacklist.indexOf(url);
        if (urlIdx > -1)
        {
            blacklist.splice(urlIdx, 1);
        }
        
        /*for every embedded image anchor*/
        $(".embeddedImgAnchor").each(function(index, element) {
            
            /*if has URL that was just whitelisted, show it*/
            if ($(this).attr("href") == url)
            {
                $(this).siblings(".imgBlacklistToggle").html("blacklist");
                $(this).siblings(".imgBlacklistToggle").attr("title", "Blacklist image");
                $(this).removeClass("blacklisted");
                $(this).show();
            }
        });
    }
    
    settings.blacklistStr = blacklist.join("\n");
    localStorage.setItem("imagefaqs", JSON.stringify(settings));
});



})();   /*end of greasemonkey script*/