//TODO FIND OUT WHY I HAVE TO RESIZE A TEXTBOX AND THEN START USING IT TO AVOID THE 1px WHITE LINE ON LEFT EDGES DURING IMG2IMG
//...lmao did setting min width 200 on info div fix that accidentally?  once the canvas is infinite and the menu bar is hideable it'll probably be a problem again

window.onload = startup;

var stableDiffusionData = { //includes img2img data but works for txt2img just fine
    prompt: "",
    negative_prompt: "",
    seed: -1,
    cfg_scale: null,
    sampler_index: "DDIM",
    steps: null,
    denoising_strength: 1,
    mask_blur: 0,
    batch_size: null,
    width: 512,
    height: 512,
    n_iter: null, // batch count
    mask: "",
    init_images: [],
    inpaint_full_res: false,
    inpainting_fill: 2,
    enable_hr: false,
    firstphase_width: 0,
    firstphase_height: 0,
    // here's some more fields that might be useful

    // ---txt2img specific:
    // "enable_hr": false,   // hires fix
    // "denoising_strength": 0, // ok this is in both txt and img2img but txt2img only applies it if enable_hr == true
    // "firstphase_width": 0, // hires fp w
    // "firstphase_height": 0, // see above s/w/h/

    // ---img2img specific
    // "init_images": [ // imageS!??!? wtf maybe for batch img2img?? i just dump one base64 in here
    //     "string"
    // ],
    // "resize_mode": 0, 
    // "denoising_strength": 0.75, // yeah see
    // "mask": "string", // string is just a base64 image
    // "mask_blur": 4,
    // "inpainting_fill": 0, // 0- fill, 1- orig, 2- latent noise, 3- latent nothing
    // "inpaint_full_res": true,
    // "inpaint_full_res_padding": 0, // px
    // "inpainting_mask_invert": 0, // bool??????? wtf
    // "include_init_images": false // ??????

}

/**
 * Some Utility Functions
 */
function sliderChangeHandlerFactory(sliderId, textBoxId, dataKey, defaultV, setter = (k, v) => stableDiffusionData[k] = v, getter = (k) => stableDiffusionData[k]) {
    const sliderEl = document.getElementById(sliderId);
    const textBoxEl = document.getElementById(textBoxId);
    const savedValue = localStorage.getItem(dataKey);

    if (savedValue) setter(dataKey, savedValue || defaultV);

    function changeHandler(evn) {
        const eventSource = evn && evn.srcElement;
        const value = eventSource && Number(eventSource.value);

        if (value) setter(dataKey, value);

        if (!eventSource || eventSource.id === textBoxId) sliderEl.value = getter(dataKey);
        setter(dataKey, Number(sliderEl.value))
        textBoxEl.value = getter(dataKey);

        localStorage.setItem(dataKey, getter(dataKey));
    }

    textBoxEl.onchange = changeHandler
    sliderEl.oninput = changeHandler

    return changeHandler
}

// stuff things use
var blockNewImages = false;
var returnedImages;
var imageIndex = 0;
var tmpImgXYWH = {};
var host = "";
var url = "/sdapi/v1/";
var endpoint = "txt2img"
var frameX = 512;
var frameY = 512;
var prevMouseX = 0;
var prevMouseY = 0;
var mouseX = 0;
var mouseY = 0;
var canvasX = 0;
var canvasY = 0;
var snapX = 0;
var snapY = 0;
var drawThis = {};
var clicked = false;
const basePixelCount = 64; //64 px - ALWAYS 64 PX
var scaleFactor = 8; //x64 px
var snapToGrid = true;
var paintMode = false;
var eraseMode = false; //TODO this is broken, functionality still exists in code but UI element is just naively disabled
var backupMaskPaintCanvas; //???
var backupMaskPaintCtx;  //...? look i am bad at this
var backupMaskChunk = null;
var backupMaskX = null;
var backupMaskY = null;
var totalImagesReturned;
// var maskEdgePixels = {};
var overMask = true;
var overMaskPx = 10;
var drawTargets = []; // is this needed?  i only draw the last one anyway...
var dropTargets = []; // uhhh yeah similar to the above but for arbitrary dropped images
var arbitraryImage;
var arbitraryImageData;
var arbitraryImageBitmap;
var arbitraryImageBase64; // seriously js cmon work with me here
var placingArbitraryImage = false; // for when the user has loaded an existing image from their computer
var enableErasing = false; // accidental right-click erase if the user isn't trying to erase is a bad thing

// info div, sometimes hidden
let mouseXInfo = document.getElementById("mouseX");
let mouseYInfo = document.getElementById("mouseY");
let canvasXInfo = document.getElementById("canvasX");
let canvasYInfo = document.getElementById("canvasY");
let snapXInfo = document.getElementById("snapX");
let snapYInfo = document.getElementById("snapY");

// canvases and related
const ovCanvas = document.getElementById("overlayCanvas"); // where mouse cursor renders
const ovCtx = ovCanvas.getContext("2d");
const tgtCanvas = document.getElementById("targetCanvas"); // where "box" gets drawn before dream happens
const tgtCtx = tgtCanvas.getContext("2d");
const maskPaintCanvas = document.getElementById("maskPaintCanvas"); // where masking brush gets painted 
const maskPaintCtx = maskPaintCanvas.getContext("2d");
const tempCanvas = document.getElementById("tempCanvas"); // where select/rejects get superimposed temporarily
const tempCtx = tempCanvas.getContext("2d");
const imgCanvas = document.getElementById("canvas"); // where dreams go
const imgCtx = imgCanvas.getContext("2d");
const bgCanvas = document.getElementById("backgroundCanvas"); // gray bg grid
const bgCtx = bgCanvas.getContext("2d");

function startup() {
    checkIfWebuiIsRunning();
    loadSettings();
    drawBackground();
    changeScaleFactor();
    changePaintMode();
    changeEraseMode();
    changeSampler();
    changeSteps();
    changeCfgScale();
    changeBatchCount();
    changeBatchSize();
    changeSnapMode();
    changeMaskBlur();
    changeSeed();
    changeOverMask();
    changeOverMaskPx();
    changeHiResFix();
    changeEnableErasing();
    document.getElementById("overlayCanvas").onmousemove = mouseMove;
    document.getElementById("overlayCanvas").onmousedown = mouseDown;
    document.getElementById("overlayCanvas").onmouseup = mouseUp;
    document.getElementById("scaleFactor").value = scaleFactor;
}

function drop(imageParams) {
    const img = new Image();
    img.onload = function () {
        writeArbitraryImage(img, imageParams.x, imageParams.y)
    }
    img.src = arbitraryImageBase64;
}

function writeArbitraryImage(img, x, y) {
    commands.runCommand('drawImage', {
        x,
        y,
        image: img,
    });
    blockNewImages = false;
    placingArbitraryImage = false;
    document.getElementById("preloadImage").files = null;
}

function dream(x, y, prompt) {
    tmpImgXYWH.x = x;
    tmpImgXYWH.y = y;
    tmpImgXYWH.w = prompt.width;
    tmpImgXYWH.h = prompt.height;
    console.log("dreaming to " + host + url + endpoint + ":\r\n" + JSON.stringify(prompt));
    postData(prompt)
        .then((data) => {
            returnedImages = data.images;
            totalImagesReturned = data.images.length;
            blockNewImages = true;
            //console.log(data); // JSON data parsed by `data.json()` call
            imageAcceptReject(x, y, data);
        });
}

async function postData(promptData) {
    this.host = document.getElementById("host").value;
    // Default options are marked with *
    const response = await fetch(this.host + this.url + this.endpoint, {
        method: 'POST', // *GET, POST, PUT, DELETE, etc.
        mode: 'cors', // no-cors, *cors, same-origin
        cache: 'default', // *default, no-cache, reload, force-cache, only-if-cached
        credentials: 'same-origin', // include, *same-origin, omit
        headers: {
            'Accept': 'application/json',
            'Content-Type': 'application/json'
        },
        redirect: 'follow', // manual, *follow, error
        referrerPolicy: 'no-referrer', // no-referrer, *no-referrer-when-downgrade, origin, origin-when-cross-origin, same-origin, strict-origin, strict-origin-when-cross-origin, unsafe-url
        body: JSON.stringify(promptData) // body data type must match "Content-Type" header
    });
    return response.json(); // parses JSON response into native JavaScript objects
}

function imageAcceptReject(x, y, data) {
    const img = new Image();
    img.onload = function () {
        tempCtx.drawImage(img, x, y); //imgCtx for actual image, tmp for... holding?
        var div = document.createElement("div");
        div.id = "veryTempDiv";
        div.style.position = "absolute";
        div.style.left = parseInt(x) + "px";
        div.style.top = parseInt(y + data.parameters.height) + "px";
        div.style.width = "150px";
        div.style.height = "50px";
        div.innerHTML = "<button onclick=\"prevImg(this)\">&lt;</button><button onclick=\"nextImg(this)\">&gt;</button><span class=\"strokeText\" id=\"currentImgIndex\"></span><span class=\"strokeText\"> of </span><span class=\"strokeText\" id=\"totalImgIndex\"></span><button onclick=\"accept(this)\">Y</button><button onclick=\"reject(this)\">N</button>"
        document.getElementById("tempDiv").appendChild(div);
        document.getElementById("currentImgIndex").innerText = "1";
        document.getElementById("totalImgIndex").innerText = totalImagesReturned;
    }
    // set the image displayed as the first regardless of batch size/count
    imageIndex = 0;
    // load the image data after defining the closure
    img.src = "data:image/png;base64," + returnedImages[imageIndex];
}

function accept(evt) {
    // write image to imgcanvas
    clearBackupMask();
    placeImage();
    removeChoiceButtons();
    clearTargetMask();
    blockNewImages = false;
}

function reject(evt) {
    // remove image entirely
    restoreBackupMask();
    clearBackupMask();
    clearTargetMask();
    removeChoiceButtons();
    blockNewImages = false;
}

function newImage(evt) {
    clearPaintedMask();
    clearBackupMask();
    clearTargetMask();
    clearImgMask();
}

function prevImg(evt) {
    if (imageIndex == 0) {
        imageIndex = totalImagesReturned;
    }
    changeImg(false);
}

function nextImg(evt) {
    if (imageIndex == (totalImagesReturned - 1)) {
        imageIndex = -1;
    }
    changeImg(true);
}

function changeImg(forward) {
    const img = new Image();
    tempCtx.clearRect(0, 0, tempCtx.width, tempCtx.height);
    img.onload = function () {
        tempCtx.drawImage(img, tmpImgXYWH.x, tmpImgXYWH.y); //imgCtx for actual image, tmp for... holding?
    }
    var tmpIndex = document.getElementById("currentImgIndex");
    if (forward) {
        imageIndex++;
    } else {
        imageIndex--;
    }
    tmpIndex.innerText = imageIndex + 1;
    // load the image data after defining the closure
    img.src = "data:image/png;base64," + returnedImages[imageIndex];  //TODO need way to dream batches and select from results
}

function removeChoiceButtons(evt) {
    const element = document.getElementById("veryTempDiv");
    element.remove();
    tempCtx.clearRect(0, 0, tempCanvas.width, tempCanvas.height);
}

function restoreBackupMask() {
    // reapply mask if exists
    if (backupMaskChunk != null && backupMaskX != null && backupMaskY != null) {
        // backup mask data exists
        var iData = new ImageData(backupMaskChunk.data, backupMaskChunk.height, backupMaskChunk.width);
        maskPaintCtx.putImageData(iData, backupMaskX, backupMaskY);
    }
}

function clearBackupMask() {
    // clear backupmask 
    backupMaskChunk = null;
    backupMaskX = null;
    backupMaskY = null;
}

function clearTargetMask() {
    tgtCtx.clearRect(0, 0, tgtCanvas.width, tgtCanvas.height);
}

function clearImgMask() {
    imgCtx.clearRect(0, 0, imgCanvas.width, imgCanvas.height);
}

function clearPaintedMask() {
    maskPaintCtx.clearRect(0, 0, maskPaintCanvas.width, maskPaintCanvas.height);
}

function placeImage() {
    const img = new Image();
    img.onload = function () {
        commands.runCommand('drawImage', {
            x: tmpImgXYWH.x,
            y: tmpImgXYWH.y,
            image: img,
        });
        tmpImgXYWH = {};
        returnedImages = null;
    }
    // load the image data after defining the closure
    img.src = "data:image/png;base64," + returnedImages[imageIndex];

}

function sleep(ms) {
    // what was this even for, anyway?
    return new Promise(resolve => setTimeout(resolve, ms));
}

function snap(i, scaled = true) {
    // very cheap test proof of concept but it works surprisingly well
    var scaleOffset = 0;
    if (scaled) {
        if (scaleFactor % 2 != 0) {
            // odd number, snaps to center of cell, oops
            scaleOffset = (basePixelCount / 2);
        }
    }
    var snapOffset = i % basePixelCount - scaleOffset;
    if (snapOffset == 0) {
        return snapOffset;
    }
    return -snapOffset;
}


function mouseMove(evt) {
    const rect = ovCanvas.getBoundingClientRect() // not-quite pixel offset was driving me insane
    const canvasOffsetX = rect.left;
    const canvasOffsetY = rect.top;
    mouseXInfo.innerText = mouseX = evt.clientX;
    mouseYInfo.innerText = mouseY = evt.clientY;
    canvasXInfo.innerText = canvasX = parseInt(evt.clientX - rect.left);
    canvasYInfo.innerText = canvasY = parseInt(evt.clientY - rect.top);
    snapXInfo.innerText = canvasX + snap(canvasX);
    snapYInfo.innerText = canvasY + snap(canvasY);
    ovCtx.clearRect(0, 0, ovCanvas.width, ovCanvas.height); // clear out the previous mouse cursor 
    if (placingArbitraryImage) {
        // ugh refactor so this isn't duplicated between arbitrary image and dream reticle modes
        snapOffsetX = 0;
        snapOffsetY = 0;
        if (snapToGrid) {
            snapOffsetX = snap(canvasX, false);
            snapOffsetY = snap(canvasY, false);
        }
        finalX = snapOffsetX + canvasX;
        finalY = snapOffsetY + canvasY;
        ovCtx.drawImage(arbitraryImage, finalX, finalY);
    } else if (!paintMode) {
        // draw targeting square reticle thingy cursor
        ovCtx.strokeStyle = "#00000077";
        snapOffsetX = 0;
        snapOffsetY = 0;
        if (snapToGrid) {
            snapOffsetX = snap(canvasX);
            snapOffsetY = snap(canvasY);
        }
        finalX = snapOffsetX + canvasX;
        finalY = snapOffsetY + canvasY;
        ovCtx.strokeRect(parseInt(finalX - ((basePixelCount * scaleFactor) / 2)), parseInt(finalY - ((basePixelCount * scaleFactor) / 2)), basePixelCount * scaleFactor, basePixelCount * scaleFactor); //origin is middle of the frame
    } else {
        // draw big translucent red blob cursor
        ovCtx.beginPath();
        ovCtx.arc(canvasX, canvasY, 4 * scaleFactor, 0, 2 * Math.PI, true); // for some reason 4x on an arc is === to 8x on a line???
        ovCtx.fillStyle = "#FF6A6A50";
        ovCtx.fill();
        // in case i'm trying to draw
        mouseX = parseInt(evt.clientX - canvasOffsetX);
        mouseY = parseInt(evt.clientY - canvasOffsetY);
        if (clicked) {
            // i'm trying to draw, please draw :(             
            if (eraseMode) {
                // THIS IS SOOOO BROKEN AND I DON'T UNDERSTAND WHY BECAUSE I AM THE BIG DUMB
                maskPaintCtx.globalCompositeOperation = 'destination-out';
                // maskPaintCtx.strokeStyle = "#FFFFFF00";
            } else {
                maskPaintCtx.globalCompositeOperation = 'source-over';
                maskPaintCtx.strokeStyle = "#FF6A6A10";
            }

            maskPaintCtx.lineWidth = 8 * scaleFactor;
            maskPaintCtx.beginPath();
            maskPaintCtx.moveTo(prevMouseX, prevMouseY);
            maskPaintCtx.lineTo(mouseX, mouseY);
            maskPaintCtx.lineJoin = maskPaintCtx.lineCap = 'round';
            maskPaintCtx.stroke();
        }
        prevMouseX = mouseX;
        prevMouseY = mouseY;
    }
}

function mouseDown(evt) {
    const rect = ovCanvas.getBoundingClientRect()
    var oddOffset = 0;
    if (scaleFactor % 2 != 0) {
        oddOffset = basePixelCount / 2;
    }
    if (evt.button == 0) { // left click
        if (placingArbitraryImage) {
            var nextBox = {};
            nextBox.x = evt.offsetX;
            nextBox.y = evt.offsetY;
            nextBox.w = arbitraryImageData.width;
            nextBox.h = arbitraryImageData.height;
            dropTargets.push(nextBox);
        } else if (paintMode) {
            //const rect = ovCanvas.getBoundingClientRect() // not-quite pixel offset was driving me insane
            const canvasOffsetX = rect.left;
            const canvasOffsetY = rect.top;
            prevMouseX = mouseX = evt.clientX - canvasOffsetX;
            prevMouseY = mouseY = evt.clientY - canvasOffsetY;
            clicked = true;
        } else {
            //const rect = ovCanvas.getBoundingClientRect()
            var nextBox = {};
            nextBox.x = evt.clientX - ((basePixelCount * scaleFactor) / 2) - rect.left + oddOffset; //origin is middle of the frame 
            nextBox.y = evt.clientY - ((basePixelCount * scaleFactor) / 2) - rect.top + oddOffset; //TODO make a way to set the origin to numpad dirs?
            nextBox.w = basePixelCount * scaleFactor;
            nextBox.h = basePixelCount * scaleFactor;
            drawTargets.push(nextBox);
        }
    } else if (evt.button == 2 && enableErasing && !paintMode) { // right click, also gotta make sure mask blob isn't being used as it's visually inconsistent with behavior of erased region
        // erase the canvas underneath the cursor, 
        ctx = imgCanvas.getContext('2d');
        if (snapToGrid) {
            ctx.clearRect(canvasX + snap(canvasX) - ((basePixelCount * scaleFactor) / 2), canvasY + snap(canvasY) - ((basePixelCount * scaleFactor) / 2), basePixelCount * scaleFactor, basePixelCount * scaleFactor);
        } else {
            ctx.clearRect(canvasX - ((basePixelCount * scaleFactor) / 2), canvasY - ((basePixelCount * scaleFactor) / 2), basePixelCount * scaleFactor, basePixelCount * scaleFactor);
        }
    }
}

function mouseUp(evt) {
    if (evt.button == 0) { // left click
        if (placingArbitraryImage) {
            // jeez i REALLY need to refactor tons of this to not be duplicated all over, that's definitely my next chore after figuring out that razza frazza overmask fade
            var target = dropTargets[dropTargets.length - 1]; //get the last one... why am i storing all of them?
            snapOffsetX = 0;
            snapOffsetY = 0;
            if (snapToGrid) {
                snapOffsetX = snap(target.x, false);
                snapOffsetY = snap(target.y, false);
            }
            finalX = snapOffsetX + target.x;
            finalY = snapOffsetY + target.y;

            drawThis.x = finalX;
            drawThis.y = finalY;
            drawThis.w = target.w;
            drawThis.h = target.h;
            drawIt = drawThis; // i still think this is really stupid and redundant and unnecessary and redundant
            drop(drawIt);
        } else if (paintMode) {
            clicked = false;
            return;
        } else {
            if (!blockNewImages) {
                //TODO seriously, refactor this
                blockNewImages = true;
                clearTargetMask();
                tgtCtx.strokeStyle = "#55000077";
                var drawIt = {}; //why am i doing this????
                var target = drawTargets[drawTargets.length - 1]; //get the last one... why am i storing all of them?
                var oddOffset = 0;
                if (scaleFactor % 2 != 0) {
                    oddOffset = basePixelCount / 2;
                }
                snapOffsetX = 0;
                snapOffsetY = 0;
                if (snapToGrid) {
                    snapOffsetX = snap(target.x);
                    snapOffsetY = snap(target.y);
                }
                finalX = snapOffsetX + target.x - oddOffset;
                finalY = snapOffsetY + target.y - oddOffset;

                drawThis.x = finalX;
                drawThis.y = finalY;
                drawThis.w = target.w;
                drawThis.h = target.h;
                tgtCtx.strokeRect(finalX, finalY, target.w, target.h);
                drawIt = drawThis; //TODO this is WRONG but also explicitly only draws the last image  ... i think
                //check if there's image data already there
                // console.log(downX + ":" + downY + " :: " + this.isCanvasBlank(downX, downY));
                if (!isCanvasBlank(drawIt.x, drawIt.y, drawIt.w, drawIt.h, imgCanvas)) {
                    // img2img
                    var mainCanvasCtx = document.getElementById("canvas").getContext("2d");
                    const imgChunk = mainCanvasCtx.getImageData(drawIt.x, drawIt.y, drawIt.w, drawIt.h); // imagedata object of the image being outpainted
                    const imgChunkData = imgChunk.data; // imagedata.data object, a big inconvenient uint8clampedarray
                    // these are the 3 mask monitors on the bottom of the page
                    var maskCanvas = document.getElementById("maskCanvasMonitor");
                    var initImgCanvas = document.getElementById("initImgCanvasMonitor");
                    var overMaskCanvas = document.getElementById("overMaskCanvasMonitor");
                    overMaskCanvas.width = initImgCanvas.width = maskCanvas.width = target.w;
                    overMaskCanvas.height = initImgCanvas.height = maskCanvas.height = target.h;
                    var maskCanvasCtx = maskCanvas.getContext("2d");
                    var initImgCanvasCtx = initImgCanvas.getContext("2d");
                    var overMaskCanvasCtx = overMaskCanvas.getContext("2d");
                    // get blank pixels to use as mask
                    const maskImgData = maskCanvasCtx.createImageData(drawIt.w, drawIt.h);
                    const initImgData = mainCanvasCtx.createImageData(drawIt.w, drawIt.h);
                    const overMaskImgData = overMaskCanvasCtx.createImageData(drawIt.w, drawIt.h);
                    // cover entire masks in black before adding masked areas

                    for (let i = 0; i < imgChunkData.length; i += 4) {
                        // l->r, top->bottom, R G B A pixel values in a big ol array
                        // make a simple mask            
                        if (imgChunkData[i + 3] == 0) { // rgba pixel values, 4th one is alpha, if it's 0 there's "nothing there" in the image display canvas and its time to outpaint
                            maskImgData.data[i] = 255; // white mask gets painted over
                            maskImgData.data[i + 1] = 255;
                            maskImgData.data[i + 2] = 255;
                            maskImgData.data[i + 3] = 255;

                            overMaskImgData.data[i] = 255; //lets just set this up now
                            overMaskImgData.data[i + 1] = 255;
                            overMaskImgData.data[i + 2] = 255;
                            overMaskImgData.data[i + 3] = 255;


                            initImgData.data[i] = 0; // null area on initial image becomes opaque black pixels
                            initImgData.data[i + 1] = 0;
                            initImgData.data[i + 2] = 0;
                            initImgData.data[i + 3] = 255;
                        } else { // leave these pixels alone 
                            maskImgData.data[i] = 0; // black mask gets ignored for in/outpainting
                            maskImgData.data[i + 1] = 0;
                            maskImgData.data[i + 2] = 0;
                            maskImgData.data[i + 3] = 255; // but it still needs an opaque alpha channel 

                            overMaskImgData.data[i] = 0;
                            overMaskImgData.data[i + 1] = 0;
                            overMaskImgData.data[i + 2] = 0;
                            overMaskImgData.data[i + 3] = 255;

                            initImgData.data[i] = imgChunkData[i]; // put the original picture back in the painted area
                            initImgData.data[i + 1] = imgChunkData[i + 1];
                            initImgData.data[i + 2] = imgChunkData[i + 2];
                            initImgData.data[i + 3] = imgChunkData[i + 3]; //it's still RGBA so we can handily do this in nice chunks'o'4
                        }
                    }
                    // make a list of all the white pixels to expand so we don't waste time on non-mask pixels
                    let pix = { x: [], y: [], index: [] };
                    var x, y, index;
                    for (y = 0; y < drawIt.h; y++) {
                        for (x = 0; x < drawIt.w; x++) {
                            index = ((y * drawIt.w + x) * 4);
                            if (overMaskImgData.data[index] > 0) {
                                pix.x.push(x);
                                pix.y.push(y);
                                pix.index.push(index);
                            }
                        }
                    }
                    for (i = 0; i < pix.index.length; i++) {
                        // get the index in the stupid array
                        // why? it's unused
                        // var currentMaskPixelIndex = pix.index[i];

                        // for any horizontal expansion, we need to ensure that the target pixel is in the same Y row
                        // horizontal left (west) is index-4 per pixel
                        // horizontal right (east) is index+4 per pixel
                        var currentMaskPixelY = pix.y[i];

                        // for any vertical expansion, we need to ensure that the target pixel is in the same X column
                        // vertical up (north) is index-(imagedata.width) per pixel
                        // vertical down (south) is index+(imagedata.width) per pixel
                        var currentMaskPixelX = pix.x[i];

                        // i hate uint8clampedarray and math
                        // primarily math
                        // actually just my brain  
                        // ok so now lets check neighbors to see if they're in the same row/column
                        for (j = overMaskPx; j > 0; j--) { // set a variable to the extreme end of the overmask size and work our way back inwards
                            // i hate uint8clampedarray and math
                            // this is so inefficient but i warned you all i'm bad at this
                            //TODO refactor like all of this, it's horrible and shameful 
                            // BUT IT WORKS
                            // but it is crushingly inefficient i'm sure
                            // BUT IT WORKS and i came up with it all by myself because i'm a big boy

                            // ... sigh it doesn't work _well_
                            // just moves the seam 
                            //TODO find a way to fade/gradient the edge without making weird artifacts or literally crashing the browser with inefficient data storage

                            // west
                            var potentialPixelIndex = ((currentMaskPixelY * drawIt.w + currentMaskPixelX) * 4) - (j * 4);
                            var potentialPixelX = (potentialPixelIndex / 4) % drawIt.w;
                            var potentialPixelY = Math.floor((potentialPixelIndex / 4) / drawIt.w);
                            // west/east: ENSURE SAME ROW using the y axis unintuitively
                            if (potentialPixelY == currentMaskPixelY) {
                                // ok then 
                                // ensure it's not already a mask pixel
                                if (overMaskImgData.data[potentialPixelIndex] != 255) {
                                    // welp fingers crossed
                                    overMaskImgData.data[potentialPixelIndex] = 255;
                                    overMaskImgData.data[potentialPixelIndex + 1] = 255;
                                    overMaskImgData.data[potentialPixelIndex + 2] = 255;
                                    overMaskImgData.data[potentialPixelIndex + 3] = 255;
                                }
                            }

                            // east
                            var potentialPixelIndex = ((currentMaskPixelY * drawIt.w + currentMaskPixelX) * 4) + (j * 4);
                            var potentialPixelX = (potentialPixelIndex / 4) % drawIt.w;
                            var potentialPixelY = Math.floor((potentialPixelIndex / 4) / drawIt.w);
                            if (potentialPixelY == currentMaskPixelY) {
                                if (overMaskImgData.data[potentialPixelIndex] != 255) {
                                    overMaskImgData.data[potentialPixelIndex] = 255;
                                    overMaskImgData.data[potentialPixelIndex + 1] = 255;
                                    overMaskImgData.data[potentialPixelIndex + 2] = 255;
                                    overMaskImgData.data[potentialPixelIndex + 3] = 255;
                                }
                            }

                            // north
                            var potentialPixelIndex = ((currentMaskPixelY * drawIt.w + currentMaskPixelX) * 4) - ((j * drawIt.w) * 4);
                            var potentialPixelX = (potentialPixelIndex / 4) % drawIt.w;
                            var potentialPixelY = Math.floor((potentialPixelIndex / 4) / drawIt.w);
                            // north/south: ENSURE SAME COLUMN using the x axis unintuitively
                            if (potentialPixelX == currentMaskPixelX) {
                                if (overMaskImgData.data[potentialPixelIndex] != 255) {
                                    overMaskImgData.data[potentialPixelIndex] = 255;
                                    overMaskImgData.data[potentialPixelIndex + 1] = 255;
                                    overMaskImgData.data[potentialPixelIndex + 2] = 255;
                                    overMaskImgData.data[potentialPixelIndex + 3] = 255;
                                }
                            }

                            // south
                            var potentialPixelIndex = ((currentMaskPixelY * drawIt.w + currentMaskPixelX) * 4) + ((j * drawIt.w) * 4);
                            var potentialPixelX = (potentialPixelIndex / 4) % drawIt.w;
                            var potentialPixelY = Math.floor((potentialPixelIndex / 4) / drawIt.w);
                            if (potentialPixelX == currentMaskPixelX) {
                                if (overMaskImgData.data[potentialPixelIndex] != 255) {
                                    overMaskImgData.data[potentialPixelIndex] = 255;
                                    overMaskImgData.data[potentialPixelIndex + 1] = 255;
                                    overMaskImgData.data[potentialPixelIndex + 2] = 255;
                                    overMaskImgData.data[potentialPixelIndex + 3] = 255;
                                }
                            }
                        }
                    }

                    // also check for painted masks in region, add them as white pixels to mask canvas
                    const maskChunk = maskPaintCtx.getImageData(drawIt.x, drawIt.y, drawIt.w, drawIt.h);
                    const maskChunkData = maskChunk.data;
                    for (let i = 0; i < maskChunkData.length; i += 4) {
                        if (maskChunkData[i + 3] != 0) {
                            maskImgData.data[i] = 255;
                            maskImgData.data[i + 1] = 255;
                            maskImgData.data[i + 2] = 255;
                            maskImgData.data[i + 3] = 255;
                            overMaskImgData.data[i] = 255;
                            overMaskImgData.data[i + 1] = 255;
                            overMaskImgData.data[i + 2] = 255;
                            overMaskImgData.data[i + 3] = 255;
                        }
                    }
                    // backup any painted masks ingested then them, replacable if user doesn't like resultant image
                    var clearArea = maskPaintCtx.createImageData(drawIt.w, drawIt.h);
                    backupMaskChunk = maskChunk;
                    backupMaskX = drawIt.x;
                    backupMaskY = drawIt.y;

                    var clearD = clearArea.data;
                    for (let i = 0; i < clearD.length; i++) {
                        clearD[i] = 0; // just null it all out
                    }
                    maskPaintCtx.putImageData(clearArea, drawIt.x, drawIt.y);
                    // mask monitors
                    maskCanvasCtx.putImageData(maskImgData, 0, 0);
                    var maskBase64 = maskCanvas.toDataURL();
                    overMaskCanvasCtx.putImageData(overMaskImgData, 0, 0); // :pray:
                    var overMaskBase64 = overMaskCanvas.toDataURL();
                    initImgCanvasCtx.putImageData(initImgData, 0, 0);
                    var initImgBase64 = initImgCanvas.toDataURL();
                    // img2img
                    endpoint = "img2img";
                    var selectedMask = overMask ? overMaskBase64 : maskBase64;
                    stableDiffusionData.mask = selectedMask;
                    // stableDiffusionData.mask = maskBase64;
                    stableDiffusionData.init_images = [initImgBase64];
                    // slightly more involved than txt2img
                } else {
                    // txt2img
                    endpoint = "txt2img";
                    // easy enough
                }
                stableDiffusionData.prompt = document.getElementById("prompt").value;
                stableDiffusionData.negative_prompt = document.getElementById("negPrompt").value;
                stableDiffusionData.width = drawIt.w;
                stableDiffusionData.height = drawIt.h;
                stableDiffusionData.firstphase_height = (drawIt.h / 2);
                stableDiffusionData.firstphase_width = (drawIt.w / 2);
                dream(drawIt.x, drawIt.y, stableDiffusionData);
            }
        }
    }
}

const changeScaleFactor = sliderChangeHandlerFactory("scaleFactor", "scaleFactorTxt", "scaleFactor", 8, (k, v) => scaleFactor = v, (k) => scaleFactor);
const changeSteps = sliderChangeHandlerFactory("steps", "stepsTxt", "steps", 30);

function changePaintMode() {
    paintMode = document.getElementById("cbxPaint").checked;
    clearTargetMask();
    ovCtx.clearRect(0, 0, ovCanvas.width, ovCanvas.height);
}

function changeEraseMode() {
    //TODO rename/refactor to make it more obvious this is just for painted masks
    eraseMode = document.getElementById("cbxErase").checked;
    clearTargetMask();
    ovCtx.clearRect(0, 0, ovCanvas.width, ovCanvas.height);
}

function changeEnableErasing() {
    // yeah because this is for the image layer
    enableErasing = document.getElementById("cbxEnableErasing").checked;
    localStorage.setItem("enable_erase", enableErasing);
}

function changeSampler() {
    stableDiffusionData.sampler_index = document.getElementById("samplerSelect").value;
    localStorage.setItem("sampler", stableDiffusionData.sampler_index);
}

const changeCfgScale = sliderChangeHandlerFactory("cfgScale", "cfgScaleTxt", "cfg_scale", 7.0);
const changeBatchSize = sliderChangeHandlerFactory("batchSize", "batchSizeText", "batch_size", 2);
const changeBatchCount = sliderChangeHandlerFactory("batchCount", "batchCountText", "n_iter", 2);

function changeSnapMode() {
    snapToGrid = document.getElementById("cbxSnap").checked;
}

function changeMaskBlur() {
    stableDiffusionData.mask_blur = document.getElementById("maskBlur").value;
    localStorage.setItem("mask_blur", stableDiffusionData.mask_blur);
}

function changeSeed() {
    stableDiffusionData.seed = document.getElementById("seed").value;
    localStorage.setItem("seed", stableDiffusionData.seed);
}

function changeOverMask() {
    overMask = document.getElementById("cbxOverMask").checked;
}

function changeOverMaskPx() {
    overMaskPx = document.getElementById("overMaskPx").value;
}

function changeHiResFix() {
    stableDiffusionData.enable_hr = Boolean(document.getElementById("cbxHRFix").checked);
    localStorage.setItem("enable_hr", stableDiffusionData.enable_hr);
}

function isCanvasBlank(x, y, w, h, specifiedCanvas) {
    var canvas = document.getElementById(specifiedCanvas.id);
    return !canvas.getContext('2d')
        .getImageData(x, y, w, h).data
        .some(channel => channel !== 0);
}

function drawBackground() {
    bgCtx.lineWidth = 1;
    bgCtx.strokeStyle = '#999';
    var gridbox = bgCanvas.getBoundingClientRect();
    for (var i = 0; i < gridbox.width; i += 64) {
        bgCtx.moveTo(i, 0);
        bgCtx.lineTo(i, bgCanvas.height);
        bgCtx.stroke();
    }
    for (var i = 0; i < gridbox.height; i += 64) {
        bgCtx.moveTo(0, i);
        bgCtx.lineTo(gridbox.width, i);
        bgCtx.stroke();
    }
}

function preloadImage() {
    // gonna legit scream 
    document.getElementById("overlayCanvas").onmousemove = null;
    document.getElementById("overlayCanvas").onmousedown = null;
    document.getElementById("overlayCanvas").onmouseup = null;

    var file = document.getElementById("preloadImage").files[0];
    var reader = new FileReader();
    reader.onload = function (evt) {
        var imgCanvas = document.createElement("canvas");
        var imgCtx = imgCanvas.getContext("2d");
        arbitraryImage = new Image();
        arbitraryImage.onload = function () {
            blockNewImages = true;
            // now put it into imagedata for canvas fun
            imgCanvas.width = arbitraryImage.width;
            imgCanvas.height = arbitraryImage.height;
            imgCtx.drawImage(arbitraryImage, 0, 0);
            arbitraryImageData = imgCtx.getImageData(0, 0, arbitraryImage.width, arbitraryImage.height); // can't use that to drawImage on a canvas...
            arbitraryImageBitmap = createImageBitmap(arbitraryImageData); // apparently that either... maybe just the raw image?
            arbitraryImageBase64 = imgCanvas.toDataURL();
            placingArbitraryImage = true;
            document.getElementById("overlayCanvas").onmousemove = mouseMove;
            document.getElementById("overlayCanvas").onmousedown = mouseDown;
            document.getElementById("overlayCanvas").onmouseup = mouseUp;
        }
        arbitraryImage.src = evt.target.result;
    }
    reader.readAsDataURL(file);
}

function downloadCanvas() {
    var link = document.createElement('a');
    link.download = new Date().toISOString().slice(0, 19).replace('T', ' ').replace(':', ' ') + ' openOutpaint image.png';
    var croppedCanvas = cropCanvas(imgCanvas);
    if (croppedCanvas != null) {
        link.href = croppedCanvas.toDataURL('image/png');
        link.click();
    }
}

function cropCanvas(sourceCanvas) {
    var w = sourceCanvas.width;
    var h = sourceCanvas.height;
    var pix = { x: [], y: [] };
    var imageData = sourceCanvas.getContext('2d').getImageData(0, 0, w, h);
    var x, y, index;

    for (y = 0; y < h; y++) {
        for (x = 0; x < w; x++) {
            // lol i need to learn what this part does 
            index = (y * w + x) * 4; // OHHH OK this is setting the imagedata.data uint8clampeddataarray index for the specified x/y coords
            //this part i get, this is checking that 4th RGBA byte for opacity
            if (imageData.data[index + 3] > 0) {
                pix.x.push(x);
                pix.y.push(y);
            }
        }
    }
    // ...need to learn what this part does too :badpokerface:
    // is this just determining the boundaries of non-transparent pixel data?
    pix.x.sort(function (a, b) { return a - b });
    pix.y.sort(function (a, b) { return a - b });
    var n = pix.x.length - 1;
    w = pix.x[n] - pix.x[0];
    h = pix.y[n] - pix.y[0];
    // yup sure looks like it

    try {
        var cut = sourceCanvas.getContext('2d').getImageData(pix.x[0], pix.y[0], w, h);
        var cutCanvas = document.createElement('canvas');
        cutCanvas.width = w;
        cutCanvas.height = h;
        cutCanvas.getContext('2d').putImageData(cut, 0, 0);
    } catch (ex) {
        // probably empty image
        //TODO confirm edge cases?
        cutCanvas = null;
    }
    return cutCanvas;
}

function checkIfWebuiIsRunning() {
    var url = document.getElementById("host").value + "/startup-events"
    fetch(url).then(response => {
        if (response.status == 200) {
            console.log("webui is running");
        }
    }).catch(error => {
        alert("WebUI doesnt seem to be running, please start it and try again\nCheck console for additional info\n" + error);
    });
}

function loadSettings() {
    // set default values if not set                                    DEFAULTS
    var _sampler = localStorage.getItem("sampler") == null ? "DDIM" : localStorage.getItem("sampler");
    var _mask_blur = localStorage.getItem("mask_blur") == null ? 0 : localStorage.getItem("mask_blur");
    var _seed = localStorage.getItem("seed") == null ? -1 : localStorage.getItem("seed");
    var _enable_hr = Boolean(localStorage.getItem("enable_hr") == (null || "false") ? false : localStorage.getItem("enable_hr"));
    var _enable_erase = Boolean(localStorage.getItem("enable_erase") == (null || "false") ? false : localStorage.getItem("enable_erase"));

    // set the values into the UI
    document.getElementById("samplerSelect").value = String(_sampler);
    document.getElementById("maskBlur").value = Number(_mask_blur);
    document.getElementById("seed").value = Number(_seed);
    document.getElementById("cbxHRFix").checked = Boolean(_enable_hr);
    document.getElementById("cbxEnableErasing").checked = Boolean(_enable_erase);
}