// ==UserScript==
// @name         4chan Image Resizer
// @namespace    https://greasyfork.org/en/users/393416
// @version      2.1
// @description  Automatically downscales images based on custom presets and more. Requires 4chan X.
// @author       greenronia
// @match        *://boards.4chan.org/*
// @match        *://boards.4channel.org/*
// @require      https://cdnjs.cloudflare.com/ajax/libs/spark-md5/3.0.0/spark-md5.js
// @grant none
// @icon         https://i.imgur.com/hQp5BTf.png
// @downloadURL none
// ==/UserScript==
//
//Using SparkMD5 to generate image hashes - https://github.com/satazor/js-spark-md5
//*********************************//
//                                 //
//        "it just werks"          //
//                                 //
//*********************************//
//                                 //
//----------DEBUG MODE-------------//
var DEBUG = false;//console        //
//---------------------------------//
if(DEBUG) console.log("[ImageResizer] Initialized");
//CSS
var style = document.createElement("style");
style.innerHTML = '' +
    '.centerImg { margin: 0; position: absolute; top: 50%; left: 50%; -ms-transform: translate(-50%, -50%); transform: translate(-50%, -50%); max-width: 100%; max-height: 100vh; height: auto; cursor: pointer; }\n' +
    '.settingsOverlay { background: rgba(0,0,0,0.8); display: none; height: 100%; left: 0; position: fixed; top: 0; width: 100%; z-index: 777; } \n' +
    '#pvOverlay { background: rgba(0,0,0,0.9); height: 100%; left: 0; position: fixed; top: 0; width: 100%; z-index: 777; text-align: center;} \n' +
    '#pvHeader { position: fixed; height: 35px; width: 100%; opacity: 0; -webkit-transition: opacity 0.5s ease-in-out;}\n' +
    '#pvHeader:hover { opacity: 0.8; -webkit-transition: none; }\n' +
    '.pvOpct { opacity: 0.7 !important; } \n' +
    '#imgResizeMenu { position: fixed; top: 20%; left: 35%; width: 35%; min-width: 670px; padding: 2em; overflow: hidden; z-index: 8;}\n' +
    '#imgResizeMenu h3 { text-align: center; }\n' +
    '#imgResizeMenu a { cursor: pointer; }\n' +
    '#imgResizeMenu label { text-decoration-line: underline; }\n' +
    '.settingsOverlay input[type=number] { -moz-appearance: textfield; text-align: right; }\n' +
    '.resizer-settings { padding-bottom: 5px }\n' +
    '#errMsg { color: red; text-align: center; }\n' +
    '#ruleTable { border-collapse: collapse; }\n' +
    '#ruleTable td, th { padding: 8px; text-align: left; border-bottom: 1pt solid; }\n' +
    '#QCTable { border-collapse: collapse; }\n' +
    '#QCTable td, th { padding: 8px; text-align: center; border-bottom: 1pt solid; }\n' +
    '#QCTable p { margin: auto; max-width: 100px; overflow: hidden; text-overflow: ellipsis; }\n' +
    '#inputContainer { text-align: center; padding-top: 30px; }\n' +
    '#inputContainer button { margin-top: 20px; }\n' +
    '.menuBtns { margin-left: 1em; }\n' +
    '#sideMenu { position: absolute; display: none; padding: 5px 0px 5px 0px; width: 101px; margin-left: -106px; margin-top: -2px;}\n' +
    '.sideMenuElement { background: inherit; display: block; cursor: pointer; padding: 2px 10px 2px 10px; text-align: left;}\n' +
    '.downscale-menu-off { display: none; }\n' +
    '.downscale-menu-on { display: block !important; }';
var styleRef = document.querySelector("script");
styleRef.parentNode.insertBefore(style, styleRef);
//Load settings
getSettings();
getPresets();
getQCList();
function getSettings() {
    if (JSON.parse(localStorage.getItem("downscale-settings"))) {
        var settings = JSON.parse(localStorage.getItem("downscale-settings"));
    }
    else {
        settings = { enabled:true, notify:true, convert:false, jpegQuality:0.92 };
    }
    return settings;
}
function getPresets() {
    if (JSON.parse(localStorage.getItem("downscale-presets"))) {
        var presets = JSON.parse(localStorage.getItem("downscale-presets"));
    }
    else {
        presets = [];
    }
    return presets;
}
function getQCList() {
    if (JSON.parse(localStorage.getItem("downscale-qclist"))) {
        var QCList = JSON.parse(localStorage.getItem("downscale-qclist"));
    }
    else {
        QCList = [];
    }
    return QCList;
}
//Checking if QuickReply dialog is open.
document.addEventListener('QRDialogCreation', function(listenForQRDC) {
    var checkBox = document.getElementById("imgResize");
    var sideMenu = document.getElementById("sideMenuArrow");
    //Checking if the "resize" check box and "side menu" already exist
    if (!sideMenu) {
        appendSideMenu();
    }
    if (!checkBox) {
        appendCheckBox();
    }
    //Listening for clicks on check box
    document.getElementById("imgResize").addEventListener("click", checkState);
    checkState(1);
    if(DEBUG) console.log("[QRFile] Listening...");
    //QRFile | Listening for QRFile, in response to: QRGetFile | Request File
    document.addEventListener('QRFile', function(GetFile) {
        if(DEBUG) console.log("[QRFile] File served: " + GetFile.detail);
        //Remove Remember option upon adding a (new) file.
        removeRemOption();
        const file = GetFile.detail;
        //Initialize an instance of a FileReader
        const reader = new FileReader();
        //Checking if the file is JPG or PNG
        if (file.type == "image/jpeg" || file.type == "image/png") {
            if(DEBUG) console.log("Acceptable File type: " + file.type);
            //Check if resizer already completed its task (to determine priority)
			var complete = false;
			var presets = getPresets();
            var QCList = getQCList();

			reader.onload = function(f) {
				var img = new Image();
				img.src = reader.result;

				img.onload = function() {
                    //Base64 MD5 hash of an image
                    var imgMD5 = SparkMD5.hash(img.src);
                    if(DEBUG) console.log("<FILTER START>");
                    if(DEBUG) if(getSettings().convert) console.log("[PNGConverter] Enabled"); else console.log("[PNGConverter] Disabled");
                    if(DEBUG) console.log("INPUT Dimensions: " + img.width + "x" + img.height);
                    if(DEBUG) console.log("INPUT File size: " + formatBytes(file.size));
                    //Add QC button
                    quickConvert(img, file, imgMD5);
                    //Remove/Add preview buton
                    removePreviewOption();
                    appendPreviewBtn(img.src, file.size, img.width, img.height, file.name);
                    //THE priority list
                    if (getQCList().length > 0) checkMD5(img, imgMD5);
					if (presets.length > 0 && !complete) checkPresets(img);
					if (getSettings().convert && !complete) checkPNG(img);
					return;
				}
				return;
			}

            function checkMD5(img, imgMD5) {
                if(DEBUG) console.log("[quickConvert] Checking for matching MD5: " + imgMD5);
                var filterCount = QCList.length;
                var matchFound = false;
                for (var i = 0; i < filterCount; i++) {
                    //unpack md5 hash
                    var filterMD5 = QCList[i].split(":").pop();
                    if (filterMD5 == imgMD5) {
                        if(DEBUG) console.log("[quickConvert] Match found.");
                        matchFound = true;
                        resizer(img.width, img.height, img);
                        break;
                    }
                }
                if(DEBUG) if (!matchFound)console.log("[quickConvert] No matching MD5 found.");
                return;
            }
			function checkPresets(img) {
				var matchCount = 0;
				var rule = [];
				var presetCount = presets.length;
				for (var i = 0; i < presetCount; i++) {
					//unpack rules
					rule[i] = presets[i].split(":");
					//check for matching file type
					if (rule[i][0] != 0) {
						switch (parseInt(rule[i][0])) {
							case 1:
								rule[i][0] = "image/png";
								break;
							case 2:
								rule[i][0] = "image/jpeg";
						}
						if (rule[i][0] != file.type) continue;
					}
					//check for matching dimensions
					if (rule[i][1] == img.width && rule[i][2] == img.height) {
						var MAX_WIDTH = parseInt(rule[i][3]);
						var MAX_HEIGHT = parseInt(rule[i][4]);
						matchCount++;
						if(DEBUG) console.log("Preset '" + i + "' matched: " + rule[i]);
						break;
					}
				}
				//failsafe
				if (matchCount == 0 || matchCount > 1) {
					if(DEBUG) console.log("Image didn't match any presets.\n------<END>------");
					return;
				}
                else {
                    resizer(MAX_WIDTH, MAX_HEIGHT, img);
                    return;
                }
			}
            //PNG -> JPEG
            function checkPNG(img) {
                if (file.type == "image/png") {
                    var MAX_WIDTH = img.width;
                    var MAX_HEIGHT = img.height;
                    if(DEBUG) console.log("[PNGConverter] Converting PNG to JPEG");
					resizer(MAX_WIDTH, MAX_HEIGHT, img);
                }
                else {
                    if(DEBUG) console.log("[PNGConverter] Image format isn't PNG.\n------<END>------");
                    return;
                }
            }
            //The main resize function
			function resizer(MAX_WIDTH, MAX_HEIGHT, img, imgMD5) {
                if(DEBUG && !imgMD5) console.log("<FILTER END>");
                removePreviewOption();
				var canvas = document.createElement("canvas");
                //Input dimensions
                var width = img.width;
                var height = img.height;
				//Calculating dimensions/aspect ratio
				if (width > height) {
					if (width > MAX_WIDTH) {
						height *= MAX_WIDTH / width;
						width = MAX_WIDTH;
					}
				} else {
					if (height > MAX_HEIGHT) {
						width *= MAX_HEIGHT / height;
						height = MAX_HEIGHT;
					}
				}
				// resize the canvas to the new dimensions
				canvas.width = width;
				canvas.height = height;
				// scale & draw the image onto the canvas
				var ctx = canvas.getContext("2d");
				ctx.drawImage(img, 0, 0, width, height);

				//Converts dataURI to blob
				function dataURItoBlob(dataURI) {
					//convert base64/URLEncoded data component to raw binary data held in a string
					var byteString;
					if (dataURI.split(',')[0].indexOf('base64') >= 0) { byteString = atob(dataURI.split(',')[1]); }
					else { byteString = unescape(dataURI.split(',')[1]); }
					//separate out the mime component
					var mimeString = dataURI.split(',')[0].split(':')[1].split(';')[0];
					//write the bytes of the string to a typed array
					var ia = new Uint8Array(byteString.length);
					for (var i = 0; i < byteString.length; i++) {
						ia[i] = byteString.charCodeAt(i);
					}
					return new Blob([ia], {
						type: mimeString
					});
				}
				//canvas to dataURL | JPEG quality (0-1)
                var dataURL;
                if (imgMD5) dataURL = canvas.toDataURL('image/jpeg', 92);
                else dataURL = canvas.toDataURL('image/jpeg', parseFloat(getSettings().jpegQuality));
				//dataURL to blob
				var blob = dataURItoBlob(dataURL);
				//Stop classObserver | prevent trigger loop
				classObserver.disconnect();
				if(DEBUG) console.log("[classObserver] Stopping...");
				setFile(blob, img, width, height, imgMD5);
                appendPreviewBtn(dataURL, blob.size, width, height, file.name);
			}
            //Set the new file to QR form
			function setFile(blob, img, width, height, imgMD5) {
				var detail = {
					file: blob,
					name: file.name
				};
				var event = new CustomEvent('QRSetFile', {
					bubbles: true,
					detail: detail
				});
				document.dispatchEvent(event);
                if (imgMD5) rememberQC(img, file, imgMD5, blob.size);
				if(DEBUG) console.log("[QRSetFile] File Sent");
				if(DEBUG) console.log("OUTPUT Dimesnions: " + Math.round(width) + "x" + Math.round(height));
				if(DEBUG) console.log("OUTPUT Filesize: " + formatBytes(blob.size));
				if(DEBUG) console.log("JPEG Quality: " + getSettings().jpegQuality);
				//Notification
				var FSInfo = "Original size: (" + formatBytes(file.size) + ", " + img.width + "x" + img.height + ") \n New size: (" + formatBytes(blob.size)+ ", " + Math.round(width) + "x" + Math.round(height) +")";
				if (getSettings().notify) {
					var msgDetail = {type: 'info', content: FSInfo, lifetime: 5};
					var msgEvent = new CustomEvent('CreateNotification', {bubbles: true, detail: msgDetail});
					document.dispatchEvent(msgEvent);
				}
                //Remove Quick Convert option after conversion
                removeQCOption();
				//Restart classObserver
				classObserver.observe(targetNode, observerOptions);
                //Preset priority
                complete = true;
				if(DEBUG) console.log("------<END>------\n[classObserver] Restarting...");
			}
            //Quick Convert (QC) image from Side Menu
            function quickConvert(img, file, imgMD5) {
                var existCheck = document.getElementById("quickConvert");
                //create QC button if it doesn't exist
                if (!existCheck) {
                    //Convert options container (future use)
                    var container = document.createElement("div");
                    container.id = "qcDiv";
                    //Convert button
                    var convert = document.createElement("a");
                    convert.id = "quickConvert";
                    convert.classList.add("sideMenuElement");
                    convert.classList.add("entry");
                    convert.innerHTML = "Quick Convert";
                    convert.title = "Convert image to JPEG";
                    //CSS on hover
                    convert.onmouseover = function(){this.classList.toggle("focused")};
                    convert.onmouseout = function(){this.classList.toggle("focused")};
                    var hr = document.createElement("hr");
                    hr.style.borderColor = getHRColor();
                    //Call resizer
                    convert.onclick = function(){
                        if(DEBUG) console.log("[quickConvert] Manually calling Resizer...");
                        resizer(img.width, img.height, img, imgMD5);
                    };
                    var parent = document.getElementById("sideMenu");
                    parent.appendChild(container);
                    container.appendChild(hr);
                    container.appendChild(convert);

                }
                //if QC button already exists
                else {
                    existCheck.onclick = function(){
                        if(DEBUG) console.log("[quickConvert] Manually calling Resizer...");
                        resizer(img.width, img.height, img, imgMD5);
                    };
                }
                return;
            }
            //Remember button
            function rememberQC (img, file, imgMD5, newSize) {
                var container = document.createElement("div");
                container.id = "remDiv";
                var remember = document.createElement("a");
                remember.id = "rememberMD5";
                remember.classList.add("sideMenuElement");
                remember.classList.add("entry");
                remember.innerHTML = "Remember";
                remember.style.fontWeight = "bold";
                remember.title = "Always convert this image."
                //CSS on hover
                remember.onmouseover = function(){this.classList.toggle("focused")};
                remember.onmouseout = function(){this.classList.toggle("focused")};
                var hr = document.createElement("hr");
                hr.style.borderColor = getHRColor();
                remember.onclick = function(){ saveImgMD5(img, file, imgMD5, newSize) };
                var parent = document.getElementById("sideMenu");
                parent.appendChild(container);
                container.appendChild(hr);
                container.appendChild(remember);
            }
            //Preview Image button
            function appendPreviewBtn(img, pvSize, pvWidth, pvHeight, pvName) {
                var existCheck = document.getElementById("previewImg");
                if (!existCheck) {
                    var preview = document.createElement("a");
                    preview.id = "previewImg";
                    preview.classList.add("sideMenuElement");
                    preview.classList.add("entry");
                    preview.innerHTML = "Preview Image";
                    //CSS on hover
                    preview.onmouseover = function(){this.classList.toggle("focused")};
                    preview.onmouseout = function(){this.classList.toggle("focused")};
                    preview.onclick = function(){ showImage(img, pvSize, pvWidth, pvHeight, pvName) };
                    var parent = document.getElementById("sideMenu");
                    parent.appendChild(preview);
                }
                else {
                    existCheck.onclick = function(){ showImage(img, pvSize, pvWidth, pvHeight, pvName) };
                }
                return;
            }
			//Read the file
            reader.readAsDataURL(file);
        } else {
            removeQCOption();
            if(DEBUG) console.log("[Error] Invalid FileType: " + file.type + "\n------<END>------");
        }
    }, false);
    //Observing if a file was uploaded or not | checking if div (with id: "file-n-submit") has class named: "has-file"
    function callback(mutationList, observer) {
        if (document.getElementById("file-n-submit").classList.contains("has-file") === true && checkState(2) === true) {
            if(DEBUG) console.log("------<START>------\n[classObserver] File detected")
            //QRGetFile | Request File
            if(DEBUG) console.log("[QRGetFile] Requesting file...");
            document.dispatchEvent(new CustomEvent('QRGetFile'));

        } else if (checkState(2) === false) {
            if(DEBUG) console.log("[classObserver] ImageResizer is disabled");
            return;
        }
        else {
            //Remove Side menu options upon removing a file.
            removeQCOption();
            removeRemOption();
            removePreviewOption();
            if(DEBUG) console.log("[classObserver] No file");
        }
    }
    //MutationObserver. Checks if div (with id "file-n-submit") has its class attribute changed
    const targetNode = document.getElementById("file-n-submit");
    var observerOptions = {
        attributes: true
    };
    var classObserver = new MutationObserver(callback);
    if(DEBUG) console.log("[classObserver] Starting...");
    classObserver.observe(targetNode, observerOptions);
}, false);
//*************************************************************************************//
//END OF THE MAIN PROCESS
//*************************************************************************************//
//Add a label with a check box for ImageResize + Setting button in Side Menu
function appendCheckBox() {
    var settingsButton = document.createElement("a");
    var label = document.createElement("label");
    var input = document.createElement("input");
    input.type = "checkbox";
    input.id = "imgResize";
    label.id = "imgResizeLabel";
    input.title = "Enable Image Resizer";
    input.style = "margin-left: 0";
    settingsButton.classList.add("sideMenuElement");
    settingsButton.classList.add("entry");
    label.classList.add("sideMenuElement");
    //CSS on hover
    label.classList.add("entry");
    var parent = document.getElementById("sideMenu");
    parent.appendChild(label);
    label.appendChild(input);
    label.title = "Enable Image Resizer";
    label.innerHTML += " Enabled";
    settingsButton.title = "Image Resizer Settings";
    settingsButton.innerHTML = "Settings";
    parent.appendChild(settingsButton);
    //CSS on hover
    label.onmouseover = function(){this.classList.toggle("focused")};
    label.onmouseout = function(){this.classList.toggle("focused")};
    settingsButton.onmouseover = function(){this.classList.toggle("focused")};
    settingsButton.onmouseout = function(){this.classList.toggle("focused")};
    //Open settings menu
    settingsButton.onclick = function(){ document.getElementById("imgResizeOverlay").style.display = "block" };
    //Checked by default
    document.getElementById("imgResize").checked = getSettings().enabled;
}
//Check box state
function checkState(caller) {
    var state = document.getElementById("imgResize").checked;
    if (state === true) {
        if (caller != 2) if(DEBUG) console.log("[ImageResizer] Enabled");
        return true;
    } else {
        if (caller != 2) if(DEBUG) console.log("[ImageResizer] Disabled");
        return false;
    }
}
//Clears error messages <p>
function clearErr() { document.getElementById("errMsg").innerHTML = ""; }
//Checks for any logic errors (upscaling)
function basicCheck(edit, rulePos) {
    var inWidth = parseInt(document.getElementById("inWidth").value);
    var inHeight = parseInt(document.getElementById("inHeight").value);
    var outWidth = parseInt(document.getElementById("outWidth").value);
    var outHeight = parseInt(document.getElementById("outHeight").value);
    var imgType = parseInt(document.getElementById("imgType").value);
    if (outWidth <= 0 || outHeight <= 0) { document.getElementById("errMsg").innerHTML = "Invalid output dimensions"; return}
    else if (inWidth < outWidth || inHeight < outHeight) { document.getElementById("errMsg").innerHTML = "Cannot upscale images"; return}
    else finalCheck(edit, imgType, inWidth, inHeight, outWidth, outHeight, rulePos);
    return;
}
//Checks for any rule overlaps
// ([0] - Image type, [1] - Input width, [2] - Input height, [3] - Output width, [4] - Output height)
function finalCheck(edit, imgType, inWidth, inHeight, outWidth, outHeight, rulePos) {
    var e = document.getElementById("imgType");
    var format = e.options[e.selectedIndex].text;
    var presetString = imgType + ":" + inWidth + ":" + inHeight + ":" + outWidth + ":" + outHeight;
    var presets = getPresets();
    if (presets.length > 0) {
        var rule = [];
        var presetCount = presets.length;
        for (var i = 0; i < presetCount; i++) {
            if (edit && i === rulePos) continue;
            rule[i] = presets[i].split(":");
            if (presetString == presets[i]) { document.getElementById("errMsg").innerHTML = "Exact preset already exists"; return }
            else if ((inWidth == rule[i][1] && inHeight == rule[i][2]) && (imgType == rule[i][0] || rule[i][0] == 0)) { document.getElementById("errMsg").innerHTML = "Preset with the same input dimensions for " + format + " format already exists"; return }
        }
    }
    //save preset
    clearErr();
    if (edit) presets[rulePos] = presetString;
    else presets.push(presetString);
    localStorage.setItem("downscale-presets", JSON.stringify(presets));
    //rebuild list
    document.getElementById("ruleTable").tBodies.item(0).innerHTML = "";
    printList();
    //hide / display
    document.getElementById("ruleInput").remove();
    document.getElementById("addRule").style.display = "inline";
    return;
}
//Check if possible to calculate output WIDTH
function aspectCheckH() {
    var inWidth = document.getElementById("inWidth").value;
    var inHeight = document.getElementById("inHeight").value;
    var outWidth = document.getElementById("outWidth").value;
    var outHeight = document.getElementById("outHeight").value;
    if (outHeight > 0) {
        if (parseInt(inHeight) >= parseInt(outHeight)) {
            calcAspect("width", inWidth, inHeight, outHeight);
            clearErr();
        }
        else {
            document.getElementById("errMsg").innerHTML = "Cannot upscale images";
        }
    }
}
//Check if possible to calculate output HEIGHT
function aspectCheckW() {
    var inWidth = document.getElementById("inWidth").value;
    var inHeight = document.getElementById("inHeight").value;
    var outWidth = document.getElementById("outWidth").value;
    var outHeight = document.getElementById("outHeight").value;
    if (outWidth > 0) {
        if (parseInt(inWidth) >= parseInt(outWidth)) {
            calcAspect("height", inWidth, inHeight, outWidth);
            clearErr();
        }
        else {
            document.getElementById("errMsg").innerHTML = "Cannot upscale images";
        }
    }
}
//Aspect ratio calculation (finds the other output dimension based on given exact input dimensions)
function calcAspect(dimension, w, h, output) {
    if (dimension == "width") {
        var width = output / h * w;
        document.getElementById("outWidth").value = Math.round(width);
    }
    if (dimension == "height") {
        var height = output / w * h;
        document.getElementById("outHeight").value = Math.round(height);
    }
}
//Populate Presets list
function printList() {
    var presets = getPresets();
    var list = document.getElementById("imgResizeList");
    var table = document.getElementById("ruleTable");
    if (presets.length > 0) {
        var rule = [];
        var presetCount = presets.length;
        for (let i = 0; i < presetCount; i++) {
            rule[i] = presets[i].split(":");
            switch (parseInt(rule[i][0])) {
                case 0:
                    rule[i][0] = "PNG/JPEG";
                    break;
                case 1:
                    rule[i][0] = "PNG";
                    break;
                case 2:
                    rule[i][0] = "JPEG";
            }
            let delRow = document.createElement("a");
            let editRow = document.createElement("a");
            delRow.innerHTML = "delete";
            editRow.innerHTML = "edit";
            //delete a rule and rebuild the list
            delRow.onclick = function() {
                if (document.getElementById("inputContainer")) document.getElementById("inputContainer").innerHTML = "";
                presets.splice(delRow.parentElement.parentElement.sectionRowIndex, 1);
                localStorage.setItem("downscale-presets", JSON.stringify(presets));
                table.tBodies.item(0).innerHTML = "";
                printList();
                clearErr();
                document.getElementById("addRule").style.display = "inline";
            };
            editRow.onclick = function() { inputUI(true, rule[i], i); clearErr(); };
            //Array contents: [0] - Image type, [1] - Input width, [2] - Input height, [3] - Output width, [4] - Output height
            var row = table.tBodies.item(0).insertRow(-1);
            row.insertCell(0).innerHTML = rule[i][0];
            row.insertCell(1).innerHTML = '[ ' + rule[i][1] + ' x ' + rule[i][2] + ' ]';
            row.insertCell(2).innerHTML = '&#8594;';
            row.insertCell(3).innerHTML = '[ ' + rule[i][3] + ' x ' + rule[i][4] + ' ]';
            row.insertCell(4).appendChild(editRow);
            row.insertCell(5).appendChild(delRow);
        }
    }
}
//Input field
function inputUI(edit, rule, rulePos) {
    if (document.getElementById("inputContainer")) document.getElementById("inputContainer").innerHTML = "";
    document.getElementById("addRule").style.display = "none";
    var inputDiv = document.getElementById("inputContainer");
    var input = document.createElement("div");
    var discardRuleBtn = document.createElement("button");
    discardRuleBtn.innerHTML = "Cancel";
    var saveRuleBtn = document.createElement("button");
    saveRuleBtn.innerHTML = "Save";
    input.id = "ruleInput";
    //Rules form
    input.innerHTML = '' +
        '' +
        '<select id="imgType" name="imgType" title="Input Format">' +
        '<option value="0">PNG/JPEG</option>' +
        '<option value="1">PNG</option>' +
        '<option value="2">JPEG</option>' +
        '</select>&ensp;' +
        '' +
        '<input type="number" id="inWidth" title="Input Width" size="2" min="0" value="0" onfocus="this.select();"></input> x ' +
        '' +
        '<input type="number" id="inHeight" title="Input Height" size="2" min="0" value="0" onfocus="this.select();"></input> ' +
        '&ensp; &#8594; &ensp; <input type="number" id="outWidth" title="Output Width" size="2" min="0" value="0" onfocus="this.select();"></input> x ' +
        '<input type="number" id="outHeight" title="Output Height" size="2" min="0" value="0" onfocus="this.select();"></input><br>';
    inputDiv.appendChild(input);
    var inWidth = document.getElementById("inWidth");
    var inHeight = document.getElementById("inHeight");
    var outWidth = document.getElementById("outWidth");
    var outHeight = document.getElementById("outHeight");
    if (edit) {
        switch (rule[0]) {
            case "PNG/JPEG":
                document.getElementById("imgType").selectedIndex = 0;
                break;
            case "PNG":
                document.getElementById("imgType").selectedIndex = 1;
                break;
            case "JPEG":
                document.getElementById("imgType").selectedIndex = 2;
        }
        inWidth.value = rule[1];
        inHeight.value = rule[2];
        outWidth.value = rule[3];
        outHeight.value = rule[4];
    }
    //Listen for user input on target dimension input fields to automatically calculate aspect ratio
    outWidth.addEventListener("input", aspectCheckW);
    outHeight.addEventListener("input", aspectCheckH);
    inWidth.onkeypress = function() { outHeight.value = 0; outWidth.value = 0; return isNumber(event); };
    inHeight.onkeypress = function() { outHeight.value = 0; outWidth.value = 0; return isNumber(event); };
    outWidth.onkeypress = function() { return isNumber(event); };
    outHeight.onkeypress = function() { return isNumber(event); };

    input.appendChild(saveRuleBtn);
    input.appendChild(discardRuleBtn);
    discardRuleBtn.onclick = function(){ document.getElementById(input.id).remove(); document.getElementById("addRule").style.display = "inline"; clearErr();};
    saveRuleBtn.onclick = function() { if (edit) basicCheck(true, rulePos); else basicCheck(false); };
}
//Populate Quick Convert List table
function printQCList() {
    var QCList = getQCList();
    var list = document.getElementById("QCList");
    var table = document.getElementById("QCTable");
    var filterCount = QCList.length;
    if (filterCount > 0) {
        var QCFilter = [];
        for (let i = 0; i < filterCount; i++) {
            QCFilter[i] = QCList[i].split(":");
            let delRow = document.createElement("a");
            delRow.innerHTML = "delete";
            delRow.onclick = function() {
                QCList.splice(delRow.parentElement.parentElement.sectionRowIndex, 1);
                localStorage.setItem("downscale-qclist", JSON.stringify(QCList));
                table.tBodies.item(0).innerHTML = "";
                printQCList();
            };
            //QCList Array: [0] - Filetype, [1] - Image Width, [2] - Image Height, [3] - Original Filesize, [4] - New Filesize, [5] - Filename, [6] - Image Base64 MD5 Hash
            var row = table.tBodies.item(0).insertRow(-1);
            row.insertCell(0).innerHTML = QCFilter[i][0];
            row.insertCell(1).innerHTML = '[ ' + QCFilter[i][1] + ' x ' + QCFilter[i][2] + ' ]';
            row.insertCell(2).innerHTML = QCFilter[i][3];
            row.insertCell(3).innerHTML = '&#8594;';
            row.insertCell(4).innerHTML = QCFilter[i][4];
            row.insertCell(5).innerHTML = '<p title = "' + QCFilter[i][5] +'">' + QCFilter[i][5] + '</p>';
            row.insertCell(6).innerHTML = '<p title = "' + QCFilter[i][6] +'">' + QCFilter[i][6] + '</p>';
            row.insertCell(7).appendChild(delRow);
        }
    }
}
//*************************************************************************************//
//                         /!\ very shitty menu ahead /!\                              //
//  I'm too lazy to fix this mess                                                      //
//*************************************************************************************//
function appendSettings() {
    //Button--------------------------------------------------------
    var span = document.createElement("span");
    var button = document.createElement("a");
    button.id = "imgResizeSettings";
    button.className += "fa fa-cog";
    button.style = "cursor: pointer;";
    button.title = "Image Resizer Settings";
    var ref = document.getElementById('shortcut-settings');
    ref.insertBefore(span, parent.nextSibling);
    span.appendChild(button);
    //Overlay | imgResizeOverlay------------------------------------
    var overlay = document.createElement("div");
    overlay.id = "imgResizeOverlay";
    overlay.classList.add("settingsOverlay");
    document.body.appendChild(overlay);
    //Settings menu links | imgResizeMenu---------------------------
    var menu = document.createElement("div");
    menu.id = "imgResizeMenu";
    menu.classList.add("dialog");
    overlay.appendChild(menu);
    var close = document.createElement("a");
    close.className += "close fa fa-times";
    close.style = "float: right;";
    close.title = "Close";
    menu.insertAdjacentElement('afterbegin', close);
    //Settings
    var settingsBtn = document.createElement("a");
    settingsBtn.innerHTML += "Settings";
    settingsBtn.classList.add("menuBtns");
    settingsBtn.style = "font-weight: bold;";
    settingsBtn.onclick = function() {
        settingsDiv.className = "downscale-menu-on";
        presetsDiv.className = "downscale-menu-off";
        QCListDiv.className = "downscale-menu-off";
        helpDiv.className = "downscale-menu-off";
        settingsBtn.style = "font-weight: bold;";
        presetsBtn.style = "";
        QCListBtn.style = "";
        helpBtn.style = "";
    };
    menu.appendChild(settingsBtn);
    //Presets
    var presetsBtn = document.createElement("a");
    presetsBtn.innerHTML += "Presets";
    presetsBtn.classList.add("menuBtns");
    presetsBtn.onclick = function() {
        settingsDiv.className = "downscale-menu-off";
        presetsDiv.className = "downscale-menu-on";
        QCListDiv.className = "downscale-menu-off";
        helpDiv.className = "downscale-menu-off";
        settingsBtn.style = "";
        presetsBtn.style = "font-weight: bold;";
        QCListBtn.style = "";
        helpBtn.style = "";
    };
    menu.appendChild(presetsBtn);
    //Quick Convert List
    var QCListBtn = document.createElement("a");
    QCListBtn.innerHTML += "Quick Convert";
    QCListBtn.classList.add("menuBtns");
    QCListBtn.onclick = function() {
        settingsDiv.className = "downscale-menu-off";
        presetsDiv.className = "downscale-menu-off";
        QCListDiv.className = "downscale-menu-on";
        helpDiv.className = "downscale-menu-off";
        settingsBtn.style = "";
        presetsBtn.style = "";
        QCListBtn.style = "font-weight: bold;";
        helpBtn.style = "";
    };
    menu.appendChild(QCListBtn);
    //Help
    var helpBtn = document.createElement("a");
    helpBtn.innerHTML += "About";
    helpBtn.classList.add("menuBtns");
    helpBtn.onclick = function() {
        settingsDiv.className = "downscale-menu-off";
        presetsDiv.className = "downscale-menu-off";
        QCListDiv.className = "downscale-menu-off";
        helpDiv.className = "downscale-menu-on";
        settingsBtn.style = "";
        presetsBtn.style = "";
        QCListBtn.style = "";
        helpBtn.style = "font-weight: bold;";
    };
    menu.appendChild(helpBtn);
    var hr = document.createElement("hr");
    hr.style.borderColor = getHRColor();
    menu.appendChild(hr);
    //Content divs| imgResizeContent------------------------------------
    var content = document.createElement("div");
    content.id = "imgResizeContent";
    menu.appendChild(content);
    content.innerHTML = "";
    var errMsg = document.createElement("p");
    errMsg.id = "errMsg";
    //Settings
    var settingsDiv = document.createElement("div");
    settingsDiv.id = "settingsDiv";
    settingsDiv.classList.add("downscale-menu-on");
    content.appendChild(settingsDiv);
    //Presets
    var presetsDiv = document.createElement("div");
    presetsDiv.id = "presetsDiv";
    presetsDiv.classList.add("downscale-menu-off");
    presetsDiv.style.textAlign = "center";
    content.appendChild(presetsDiv);
    //Quick Convert List
    var QCListDiv = document.createElement("div");
    QCListDiv.id = "QCListDiv";
    QCListDiv.classList.add("downscale-menu-off");
    content.appendChild(QCListDiv);
    //Help
    var helpDiv = document.createElement("div");
    helpDiv.id = "heplDiv";
    helpDiv.classList.add("downscale-menu-off");
    content.appendChild(helpDiv);
    //Enable Resizer------------------------------------------------
    var title = document.createElement("h3");
    title.innerHTML = "Image Resizer Settings";
    settingsDiv.appendChild(title);
    var enableDiv = document.createElement("div");
    enableDiv.classList.add("resizer-settings");
    enableDiv.innerHTML = '' +
        '<input type="checkbox" id="enableSet" title="" size="1"></input>' +
        '<label for="enableSet">Enable Resizer</label>:&ensp;' +
        'Enable / disable 4chan Image Resizer.';
    settingsDiv.appendChild(enableDiv);
    var enableSet = document.getElementById('enableSet');
    enableSet.checked = getSettings().enabled;
    enableSet.oninput = function() {
        var settings = getSettings();
        settings.enabled = enableSet.checked;
        document.getElementById("imgResize").checked = enableSet.checked;
        localStorage.setItem("downscale-settings", JSON.stringify(settings));
    };
    //Display notifications-----------------------------------------
    var notifySetDiv = document.createElement("div");
    notifySetDiv.classList.add("resizer-settings");
    notifySetDiv.innerHTML = '' +
        '<input type="checkbox" id="displaySet" title="" size="1"></input>' +
        '<label for="displaySet">Display Notifications</label>:&ensp;' +
        'Displays a notification when an image is downscaled.';
    settingsDiv.appendChild(notifySetDiv);
    var notifySet = document.getElementById('displaySet');
    notifySet.checked = getSettings().notify;
    notifySet.oninput = function() {
        var settings = getSettings();
        settings.notify = notifySet.checked;
        localStorage.setItem("downscale-settings", JSON.stringify(settings));
    };
    //Convert all PNGs to JPEGs-------------------------------------
    var convertSetDiv = document.createElement("div");
    convertSetDiv.classList.add("resizer-settings");
    convertSetDiv.innerHTML = '' +
        '<input type="checkbox" id="convertSet" title="" size="1"></input>' +
        '<label for="convertSet">Convert All PNGs</label>:&ensp;' +
        'Automatically converts all added PNGs to JPEGs. Presets apply as normal.';
    settingsDiv.appendChild(convertSetDiv);
    var convertSet = document.getElementById('convertSet');
    convertSet.checked = getSettings().convert;
    convertSet.oninput = function() {
        var settings = getSettings();
        settings.convert = convertSet.checked;
        localStorage.setItem("downscale-settings", JSON.stringify(settings));
    };
    //Set JPEG quality----------------------------------------------
    //RegExp ^(0(\.\d{1,2})?|1(\.0+)?)$
    //Only one number (0 or 1) before decimal, and up tp 2 numbers after decimal, if there is a 0 before decimal (between 0 and 9)
    //e.g. 0.92 true, 1.92 false
    var qualitySetDiv = document.createElement("div");
    qualitySetDiv.classList.add("resizer-settings");
    qualitySetDiv.innerHTML = '' +
        '<input type="text" id="imgQuality" title="JPEG Quality" size="1"></input>' +
        '<label for="imgQuality">JPEG Quality</label>:&ensp;' +
        'A number between 0 and 1 indicating the output image quality. Recommended 0.92.';
    settingsDiv.appendChild(qualitySetDiv);
    var inputField = document.getElementById('imgQuality');
    inputField.value = getSettings().jpegQuality;
    inputField.onkeypress = function() { return isDecimalNumber(event); };
    //Check input field validity
    inputField.oninput = function() {
        var inputField = document.getElementById('imgQuality');
        var r = new RegExp(/^(0(\.\d{1,2})?|1(\.0+)?)$/);
        if(r.test(document.getElementById('imgQuality').value)) {
            inputField.setCustomValidity("");
            var settings = getSettings();
            settings.jpegQuality = inputField.value;
            localStorage.setItem("downscale-settings", JSON.stringify(settings));
        }
        else inputField.setCustomValidity("Set the value between 1 and 0 up to 2 numbers after the decimal point.");
    };
    //Preset table | ruleTable----------------------------------------
    var tableWrapper = document.createElement("div");
    tableWrapper.style.overflowY = "auto";
    tableWrapper.style.maxHeight = "200px";
    var table = document.createElement("table");
    var thead = document.createElement("thead");
    var tbody = document.createElement("tbody");
    var presetsTitle = document.createElement("h3");
    presetsTitle.innerHTML = "Presets";
    presetsDiv.appendChild(presetsTitle);
    table.appendChild(thead);
    table.appendChild(tbody);
    table.id = "ruleTable";
    var row = thead.insertRow(0);
    row.insertCell(0).outerHTML = "<th>Format</th>";
    row.insertCell(1).outerHTML = "<th>Input</th>";
    row.insertCell(2).outerHTML = "<th></th>";
    row.insertCell(3).outerHTML = "<th>Output</th>";
    row.insertCell(4).outerHTML = "<th></th>";
    row.insertCell(5).outerHTML = "<th></th>";
    presetsDiv.appendChild(tableWrapper);
    tableWrapper.appendChild(table);
    //Input container | inputContainer------------------------------
    var inputDiv = document.createElement("div");
    inputDiv.id = "inputContainer";
    presetsDiv.appendChild(inputDiv);
    var addRuleBtn = document.createElement("button");
    addRuleBtn.id = "addRule";
    addRuleBtn.innerHTML = "New Preset";
    printList();
    presetsDiv.appendChild(addRuleBtn);
    presetsDiv.appendChild(errMsg);
    button.onclick = function(){ overlay.style.display = "block"; };
    close.onclick = function(){ overlay.style.display = "none"; };
    window.addEventListener('click', function(closeSettingsMenu) {
        if (closeSettingsMenu.target == overlay) overlay.style.display = "none";
    });
    addRuleBtn.onclick = function(){ inputUI(false); };
    //Quick Convert table | QCTable----------------------------------
    var QCTableWrapper = document.createElement("div");
    QCTableWrapper.style.overflowY = "auto";
    QCTableWrapper.style.maxHeight = "210px";
    var QCTable = document.createElement("table");
    var QCThead = document.createElement("thead");
    var QCTbody = document.createElement("tbody");
    var QCTitle = document.createElement("h3");
    QCTitle.innerHTML = "Quick Convert List";
    QCListDiv.appendChild(QCTitle);
    QCListDiv.innerHTML += "<p style='text-align: center;'>Images on this list will be automatically converted to JPEG with a quality setting of 92.</p>";
    QCTable.appendChild(QCThead);
    QCTable.appendChild(QCTbody);
    QCTable.id = "QCTable";
    var QCRow = QCThead.insertRow(0);
    QCRow.insertCell(0).outerHTML = "<th>Format</th>";
    QCRow.insertCell(1).outerHTML = "<th>Dimensions</th>";
    QCRow.insertCell(2).outerHTML = "<th>Original Size</th>";
    QCRow.insertCell(3).outerHTML = "<th></th>";
    QCRow.insertCell(4).outerHTML = "<th>New Size</th>";
    QCRow.insertCell(5).outerHTML = "<th>Filename</th>";
    QCRow.insertCell(6).outerHTML = "<th>MD5 Hash</th>";
    QCRow.insertCell(7).outerHTML = "<th></th>";
    QCListDiv.appendChild(QCTableWrapper);
    QCTableWrapper.appendChild(QCTable);
    printQCList();
    //Help----------------------------------------------------------
    var helpTitle = document.createElement("h3");
    helpTitle.innerHTML = "About";
    helpDiv.appendChild(helpTitle);
    var rant = document.createElement("p");
    rant.innerHTML = '<span style="font-weight:bold;">4chan Image <span style="text-decoration-line: line-through;">Resizer</span></span> <s>can\'t upscale</s> automatically downscales images based on custom presets. Originally developed to downscale anime/vidya screenshots "on the fly".<br><br>' +
        'To get started, you first have to create a preset by choosing an input image format and entering input and output dimensions (pixels). Then just add (drag & drop) an image to a quick reply form. ' +
        '<br>If it meets any of the presets input requirements, the image will be automatically downscaled to specified dimensions as a <span style="font-weight:bold;">JPEG</span>. ' +
        '<br><br><span style="font-weight:bold;">Note</span> that output dimensions are constrained by input dimensions <span style="font-weight:bold;">aspect ratio</span>. ' +
        '<br><span style="font-weight:bold;">Also note</span> that <span style="font-weight:bold;">setting JPEG output quality to 1</span> may result in filesizes larger than that of the original image, and should be considered as a placebo.' +
        '<br><br><span style="font-weight:bold; color: red;">NEW</span><br><span style="font-weight:bold;"> "Quick Convert"</span> allows you to quickly convert images (PNG/JPEG) to JPEG at a quality of 92 <s>for now</s>.' +
        '<br>This is very useful when an image exceeds 4chan image size limit of <span style="font-weight:bold;">4 MB</span> (higher on some other boards) and you do not want to, or cannot be bothered to lower the resolution manually.' +
        '<br>It works well on super high resolution images (+3000px), sometimes drastically cutting the filesize without any noticeble quality loss.' +
        ' However, <span style="font-weight:bold;">it is not recommended to use it on grayscale PNG images</span>, i.e. manga pages, because most of the time <span style="font-weight:bold;">it will result in larger than original filesizes</span>.' +
        '<br>Once you are satisfied with the "Quick Convert" results, you can click "Remember" on the "Side Menu" to add the image MD5 hash <s>not the actual image MD5 hash, the Image->Base64->MD5 hash</s> to "Quick Convert List", which allows you to always automatically convert this image before posting.' +
        '<br><br> Also added a simple <span style="font-weight:bold;">"Preview Image"</span> feature for JPEGs/PNGs. Click on the image to close it.' +
        '<br><a style="float: right;" href="https://greasyfork.org/en/scripts/391758-4chan-image-resizer" target="_blank">[version 2.1]</a>';
    helpDiv.appendChild(rant);
}
//Only when QR form is open.
function appendSideMenu() {
    //Arrow | sideMenuArrow----------------------------------------------------------
    var arrow = document.createElement("a");
    arrow.id = "sideMenuArrow";
    arrow.title = "Image Settings";
    arrow.style.cursor = "pointer";
    arrow.innerHTML = "&#9664;";
    var arrowRef = document.getElementById("autohide");
    arrowRef.parentNode.insertAdjacentElement("beforebegin", arrow);
    arrow.onclick = function(){ sideMenu.classList.toggle("downscale-menu-on"); };
    //Side Menu | sideMenu----------------------------------------------------------
    var sideMenu = document.createElement("div");
    sideMenu.id = "sideMenu";
    sideMenu.classList.add("dialog");
    var sideMenuRef = document.getElementById("qr");
    sideMenuRef.insertAdjacentElement("afterbegin", sideMenu);
    //Close side menu dialog by clicking anywhere but here:
    window.addEventListener('click', function(event) {
        var getSideMenu = document.getElementById("sideMenu");
        if (!event.target.matches('#sideMenuArrow') &&
            !event.target.matches('#sideMenu') &&
            !event.target.matches('#imgResize') &&
            !event.target.matches('#quickConvert') &&
            !event.target.matches('#imgResizeLabel')) {
            if (getSideMenu.classList.contains('downscale-menu-on')) getSideMenu.classList.remove('downscale-menu-on');
        }
    });
}
//*************************************************************************************//
//END OF MENUs                                                                         //
//*************************************************************************************//
//Saves image details to local storage
function saveImgMD5 (img, file, imgMD5, newSize) {
    removeRemOption();
    var QCList = getQCList();
    //"file/jpeg" -> "JPEG"
    var filetype = file.type.split("/").pop().toUpperCase();
    //remove filetype
    var filename = file.name.split(".").slice(0,-1).join(".");
    var orig_filesize = formatBytes(file.size);
    var new_filesize = formatBytes(newSize);
    //QCList Array [0] - Filetype, [1] - Image Width, [2] - Image Height, [3] - Original Filesize, [4] - New Filesize, [5] - Filename, [6] - Image Base64 MD5 Hash
    var QCString = filetype + ":" + img.width + ":" + img.height + ":" + orig_filesize + ":" + new_filesize + ":" + filename + ":" + imgMD5;
    QCList.push(QCString);
    localStorage.setItem("downscale-qclist", JSON.stringify(QCList));
    //Show notification
    var info = 'Added to the "Quick Convert List"';
    var msgDetail = {type: 'info', content: info, lifetime: 5};
    var msgEvent = new CustomEvent('CreateNotification', {bubbles: true, detail: msgDetail});
    document.dispatchEvent(msgEvent);
    //Print list
    document.getElementById("QCTable").tBodies.item(0).innerHTML = "";
    printQCList();
}
//Removes these Side Menu options
function removeQCOption() {
    var checkQC = document.getElementById("qcDiv");
    if (checkQC) checkQC.remove();
}
function removeRemOption() {
    var checkRem = document.getElementById("remDiv");
    if (checkRem) checkRem.remove();
}
function removePreviewOption() {
    var checkPreview = document.getElementById("previewImg");
    if (checkPreview) checkPreview.remove();
}
//Get border color for <hr> hack
function getHRColor () {
    var sample = document.getElementById("imgResizeMenu");
    return window.getComputedStyle(sample, null).getPropertyValue("border-bottom-color");
}
function showImage(img, size, width, height, filename) {
    var overlay = document.createElement("div");
    overlay.id = "pvOverlay";
    //-----------------------------------------------
    var pvHeader = document.createElement("div");
    pvHeader.id = "pvHeader";
    pvHeader.className = "dialog";
    //opacity hack
    pvHeader.classList.add("pvOpct");
    pvHeader.innerHTML = filename + "<br>(" + formatBytes(size)+ ", " + Math.round(width) + "x" + Math.round(height) + ")";
    //-----------------------------------------------
    var closePv = document.createElement("a");
    closePv.className = "close fa fa-times";
    closePv.style = "float: right;";
    closePv.onclick = function(){ overlay.remove(); };
    //-----------------------------------------------
    var pvImg = document.createElement("img");
    pvImg.id = "pvImg";
    pvImg.classList.add("centerImg");
    pvImg.title = "Click to close";
    pvImg.src = img;
    pvImg.onclick = function(){ overlay.remove(); };
    //-----------------------------------------------
    document.body.appendChild(overlay);
    //overlay.appendChild(closePv);
    overlay.appendChild(pvImg);
    overlay.appendChild(pvHeader);
    //opacity hack
    setTimeout(function() { pvHeader.classList.toggle("pvOpct"); }, 2000);
}
appendSettings();
//Bloat
function isDecimalNumber(e){var h=e.which?e.which:e.keyCode;return!(46!=h&&h>31&&(h<48||h>57));}
function isNumber(e){var i=(e=e||window.event).which?e.which:e.keyCode;return!(i>31&&(i<48||i>57));}
function formatBytes(a,b){if(0==a)return"0 Bytes";var c=1024,d=b||2,e=["Bytes","KB","MB","GB","TB","PB","EB","ZB","YB"],f=Math.floor(Math.log(a)/Math.log(c));return parseFloat((a/Math.pow(c,f)).toFixed(d))+" "+e[f];}