import * as Color from 'color';
import { ColorResult } from 'react-color';
import * as rp from 'request-promise';
import { Socket } from 'socket.io';
import * as uuid from 'uuid';
import { DocumentType } from './client/documents/DocumentTypes';
import { Colors } from './client/views/global/globalEnums';
import { DocumentView } from './client/views/nodes/DocumentView';
import { Message } from './server/Message';

export namespace Utils {
    export let CLICK_TIME = 300;
    export let DRAG_THRESHOLD = 4;
    export let SNAP_THRESHOLD = 10;
    export function isClick(x: number, y: number, downX: number, downY: number, downTime: number) {
        return Date.now() - downTime < Utils.CLICK_TIME && Math.abs(x - downX) < Utils.DRAG_THRESHOLD && Math.abs(y - downY) < Utils.DRAG_THRESHOLD;
    }

    export function cleanDocumentType(type: DocumentType) {
        switch (type) {
            case DocumentType.IMG:
                return 'Image';
            case DocumentType.AUDIO:
                return 'Audio';
            case DocumentType.COL:
                return 'Collection';
            case DocumentType.RTF:
                return 'Text';
            default:
                return type.charAt(0).toUpperCase() + type.slice(1);
        }
    }

    export function readUploadedFileAsText(inputFile: File) {
        const temporaryFileReader = new FileReader();

        return new Promise((resolve, reject) => {
            temporaryFileReader.onerror = () => {
                temporaryFileReader.abort();
                reject(new DOMException('Problem parsing input file.'));
            };

            temporaryFileReader.onload = () => {
                resolve(temporaryFileReader.result);
            };
            temporaryFileReader.readAsText(inputFile);
        });
    }

    export function GenerateGuid(): string {
        return uuid.v4();
    }

    export function GenerateDeterministicGuid(seed: string): string {
        return uuid.v5(seed, uuid.v5.URL);
    }

    export function GuestID() {
        return '__guest__';
    }

    /**
     * Uploads an image buffer to the server and stores with specified filename.  by default the image
     * is stored at multiple resolutions each retrieved by using the filename appended with _o, _s, _m, _l (indicating original, small, medium, or large)
     * @param imageUri the bytes of the image
     * @param returnedFilename the base filename to store the image on the server
     * @param nosuffix optionally suppress creating multiple resolution images
     */
    export async function convertDataUri(imageUri: string, returnedFilename: string, nosuffix = false, replaceRootFilename?: string) {
        try {
            const posting = Utils.prepend('/uploadURI');
            const returnedUri = await rp.post(posting, {
                body: {
                    uri: imageUri,
                    name: returnedFilename,
                    nosuffix,
                    replaceRootFilename,
                },
                json: true,
            });
            return returnedUri;
        } catch (e) {
            console.log('ConvertDataURI :' + e);
        }
    }

    export function GetScreenTransform(ele?: HTMLElement | null): { scale: number; translateX: number; translateY: number } {
        if (!ele) {
            return { scale: 1, translateX: 1, translateY: 1 };
        }
        const rect = ele.getBoundingClientRect();
        const scale = ele.offsetWidth === 0 && rect.width === 0 ? 1 : rect.width / ele.offsetWidth;
        const translateX = rect.left;
        const translateY = rect.top;

        return { scale, translateX, translateY };
    }

    export function TraceConsoleLog() {
        ['log', 'warn'].forEach(function (method) {
            const old = (console as any)[method];
            (console as any)[method] = function () {
                let stack = new Error('').stack?.split(/\n/);
                // Chrome includes a single "Error" line, FF doesn't.
                if (stack && stack[0].indexOf('Error') === 0) {
                    stack = stack.slice(1);
                }
                const message = (stack?.[1] || 'Stack undefined!').trim();
                const args = ([] as any[]).slice.apply(arguments).concat([message]);
                return old.apply(console, args);
            };
        });
    }

    /**
     * A convenience method. Prepends the full path (i.e. http://localhost:<port>) to the
     * requested extension
     * @param extension the specified sub-path to append to the window origin
     */
    export function prepend(extension: string): string {
        return window.location.origin + extension;
    }
    export function fileUrl(filename: string): string {
        return prepend(`/files/${filename}`);
    }

    export function shareUrl(documentId: string): string {
        return prepend(`/doc/${documentId}?sharing=true`);
    }

    export function CorsProxy(url: string): string {
        return prepend('/corsProxy/') + encodeURIComponent(url);
    }

    export function CopyText(text: string) {
        navigator.clipboard.writeText(text);
    }

    export function decimalToHexString(number: number) {
        if (number < 0) {
            number = 0xffffffff + number + 1;
        }
        return (number < 16 ? '0' : '') + number.toString(16).toUpperCase();
    }

    export function colorString(color: ColorResult) {
        return color.hex.startsWith('#') && color.hex.length < 8 ? color.hex + (color.rgb.a ? decimalToHexString(Math.round(color.rgb.a * 255)) : 'ff') : color.hex;
    }

    export function fromRGBAstr(rgba: string) {
        const rm = rgba.match(/rgb[a]?\(([ 0-9]+)/);
        const r = rm ? Number(rm[1]) : 0;
        const gm = rgba.match(/rgb[a]?\([ 0-9]+,([ 0-9]+)/);
        const g = gm ? Number(gm[1]) : 0;
        const bm = rgba.match(/rgb[a]?\([ 0-9]+,[ 0-9]+,([ 0-9]+)/);
        const b = bm ? Number(bm[1]) : 0;
        const am = rgba.match(/rgba?\([ 0-9]+,[ 0-9]+,[ 0-9]+,([ .0-9]+)/);
        const a = am ? Number(am[1]) : 1;
        return { r: r, g: g, b: b, a: a };
    }

    const isTransparentFunctionHack = 'isTransparent(__value__)';
    export const noRecursionHack = '__noRecursion';

    // special case filters
    export const noDragDocsFilter = 'noDragDocs::any::check';
    export const TransparentBackgroundFilter = `backgroundColor::${isTransparentFunctionHack},${noRecursionHack}::check`; // bcz: hack.  noRecursion should probably be either another ':' delimited field, or it should be a modifier to the comparision (eg., check, x, etc) field
    export const OpaqueBackgroundFilter = `backgroundColor::${isTransparentFunctionHack},${noRecursionHack}::x`; // bcz: hack.  noRecursion should probably be either another ':' delimited field, or it should be a modifier to the comparision (eg., check, x, etc) field

    export function IsRecursiveFilter(val: string) {
        return !val.includes(noRecursionHack);
    }
    export function HasFunctionFilter(val: string) {
        if (val.includes(isTransparentFunctionHack)) return (color: string) => color !== '' && DashColor(color).alpha() !== 1;
        // add other function filters here...
        return undefined;
    }

    export function toRGBAstr(col: { r: number; g: number; b: number; a?: number }) {
        return 'rgba(' + col.r + ',' + col.g + ',' + col.b + (col.a !== undefined ? ',' + col.a : '') + ')';
    }

    export function HSLtoRGB(h: number, s: number, l: number) {
        // Must be fractions of 1
        // s /= 100;
        // l /= 100;

        const c = (1 - Math.abs(2 * l - 1)) * s,
            x = c * (1 - Math.abs(((h / 60) % 2) - 1)),
            m = l - c / 2;
        let r = 0,
            g = 0,
            b = 0;
        if (0 <= h && h < 60) {
            r = c;
            g = x;
            b = 0;
        } else if (60 <= h && h < 120) {
            r = x;
            g = c;
            b = 0;
        } else if (120 <= h && h < 180) {
            r = 0;
            g = c;
            b = x;
        } else if (180 <= h && h < 240) {
            r = 0;
            g = x;
            b = c;
        } else if (240 <= h && h < 300) {
            r = x;
            g = 0;
            b = c;
        } else if (300 <= h && h < 360) {
            r = c;
            g = 0;
            b = x;
        }
        r = Math.round((r + m) * 255);
        g = Math.round((g + m) * 255);
        b = Math.round((b + m) * 255);
        return { r: r, g: g, b: b };
    }

    export function RGBToHSL(r: number, g: number, b: number) {
        // Make r, g, and b fractions of 1
        r /= 255;
        g /= 255;
        b /= 255;

        // Find greatest and smallest channel values
        const cmin = Math.min(r, g, b),
            cmax = Math.max(r, g, b),
            delta = cmax - cmin;
        let h = 0,
            s = 0,
            l = 0;
        // Calculate hue

        // No difference
        if (delta === 0) h = 0;
        // Red is max
        else if (cmax === r) h = ((g - b) / delta) % 6;
        // Green is max
        else if (cmax === g) h = (b - r) / delta + 2;
        // Blue is max
        else h = (r - g) / delta + 4;

        h = Math.round(h * 60);

        // Make negative hues positive behind 360°
        if (h < 0) h += 360; // Calculate lightness

        l = (cmax + cmin) / 2;

        // Calculate saturation
        s = delta === 0 ? 0 : delta / (1 - Math.abs(2 * l - 1));

        // Multiply l and s by 100
        // s = +(s * 100).toFixed(1);
        // l = +(l * 100).toFixed(1);

        return { h: h, s: s, l: l };
    }

    export function scrollIntoView(targetY: number, targetHgt: number, scrollTop: number, contextHgt: number, minSpacing: number, scrollHeight: number) {
        if (!targetHgt) return targetY; // if there's no height, then assume that
        if (scrollTop + contextHgt < Math.min(scrollHeight, targetY + minSpacing + targetHgt)) {
            return Math.ceil(targetY + minSpacing + targetHgt - contextHgt);
        }
        if (scrollTop >= Math.max(0, targetY - minSpacing)) {
            return Math.max(0, Math.floor(targetY - minSpacing));
        }
    }

    export function clamp(n: number, lower: number, upper: number) {
        return Math.max(lower, Math.min(upper, n));
    }

    export function distanceBetweenHorizontalLines(xs: number, xe: number, y: number, xs2: number, xe2: number, y2: number): [number, number[]] {
        if ((xs2 <= xs && xe2 >= xs) || (xs2 <= xe && xe2 >= xe) || (xs2 >= xs && xe2 <= xe)) return [Math.abs(y - y2), [Math.max(xs, xs2), y, Math.min(xe, xe2), y]];
        if (xe2 <= xs) return [Math.sqrt((xe2 - xs) * (xe2 - xs) + (y2 - y) * (y2 - y)), [xs, y, xs, y]];
        //if (xs2 > xe)
        return [Math.sqrt((xs2 - xe) * (xs2 - xe) + (y2 - y) * (y2 - y)), [xe, y, xe, y]];
    }
    export function distanceBetweenVerticalLines(x: number, ys: number, ye: number, x2: number, ys2: number, ye2: number): [number, number[]] {
        if ((ys2 <= ys && ye2 >= ys) || (ys2 <= ye && ye2 >= ye) || (ys2 >= ys && ye2 <= ye)) return [Math.abs(x - x2), [x, Math.max(ys, ys2), x, Math.min(ye, ye2)]];
        if (ye2 <= ys) return [Math.sqrt((ye2 - ys) * (ye2 - ys) + (x2 - x) * (x2 - x)), [x, ys, x, ys]];
        //if (ys2 > ye)
        return [Math.sqrt((ys2 - ye) * (ys2 - ye) + (x2 - x) * (x2 - x)), [x, ye, x, ye]];
    }

    export function rotPt(x: number, y: number, radAng: number) {
        return { x: x * Math.cos(radAng) - y * Math.sin(radAng), y: x * Math.sin(radAng) + y * Math.cos(radAng) };
    }

    function project(px: number, py: number, ax: number, ay: number, bx: number, by: number) {
        if (ax === bx && ay === by) return { point: { x: ax, y: ay }, left: false, dot: 0, t: 0 };
        const atob = { x: bx - ax, y: by - ay };
        const atop = { x: px - ax, y: py - ay };
        const len = atob.x * atob.x + atob.y * atob.y;
        var dot = atop.x * atob.x + atop.y * atob.y;
        const t = Math.min(1, Math.max(0, dot / len));

        dot = (bx - ax) * (py - ay) - (by - ay) * (px - ax);

        return {
            point: {
                x: ax + atob.x * t,
                y: ay + atob.y * t,
            },
            left: dot < 1,
            dot: dot,
            t: t,
        };
    }

    export function closestPtBetweenRectangles(l: number, t: number, w: number, h: number, l1: number, t1: number, w1: number, h1: number, x: number, y: number) {
        const r = l + w,
            b = t + h;
        const r1 = l1 + w1,
            b1 = t1 + h1;
        const hsegs = [
            [l, r, t, l1, r1, t1],
            [l, r, b, l1, r1, t1],
            [l, r, t, l1, r1, b1],
            [l, r, b, l1, r1, b1],
        ];
        const vsegs = [
            [l, t, b, l1, t1, b1],
            [r, t, b, l1, t1, b1],
            [l, t, b, r1, t1, b1],
            [r, t, b, r1, t1, b1],
        ];
        const res = hsegs.reduce(
            (closest, seg) => {
                const res = distanceBetweenHorizontalLines(seg[0], seg[1], seg[2], seg[3], seg[4], seg[5]);
                return res[0] < closest[0] ? res : closest;
            },
            [Number.MAX_VALUE, []] as [number, number[]]
        );
        const fres = vsegs.reduce((closest, seg) => {
            const res = distanceBetweenVerticalLines(seg[0], seg[1], seg[2], seg[3], seg[4], seg[5]);
            return res[0] < closest[0] ? res : closest;
        }, res);

        const near = project(x, y, fres[1][0], fres[1][1], fres[1][2], fres[1][3]);
        return project(near.point.x, near.point.y, fres[1][0], fres[1][1], fres[1][2], fres[1][3]);
    }

    export function getNearestPointInPerimeter(l: number, t: number, w: number, h: number, x: number, y: number) {
        const r = l + w,
            b = t + h;

        (x = clamp(x, l, r)), (y = clamp(y, t, b));

        const dl = Math.abs(x - l),
            dr = Math.abs(x - r),
            dt = Math.abs(y - t),
            db = Math.abs(y - b);

        const m = Math.min(dl, dr, dt, db);

        return m === dt ? [x, t] : m === db ? [x, b] : m === dl ? [l, y] : [r, y];
    }

    export function GetClipboardText(): string {
        const textArea = document.createElement('textarea');
        document.body.appendChild(textArea);
        textArea.focus();
        textArea.select();

        try {
            document.execCommand('paste');
        } catch (err) {}

        const val = textArea.value;
        document.body.removeChild(textArea);
        return val;
    }

    export const loggingEnabled: Boolean = false;
    export const logFilter: number | undefined = undefined;

    export function log(prefix: string, messageName: string, message: any, receiving: boolean) {
        if (!loggingEnabled) {
            return;
        }
        message = message || {};
        if (logFilter !== undefined && logFilter !== message.type) {
            return;
        }
        const idString = (message.id || '').padStart(36, ' ');
        prefix = prefix.padEnd(16, ' ');
        console.log(`${prefix}: ${idString}, ${receiving ? 'receiving' : 'sending'} ${messageName} with data ${JSON.stringify(message)} `);
    }

    export function loggingCallback(prefix: string, func: (args: any) => any, messageName: string) {
        return (args: any) => {
            log(prefix, messageName, args, true);
            func(args);
        };
    }

    export function Emit<T>(socket: Socket, message: Message<T>, args: T) {
        log('Emit', message.Name, args, false);
        socket.emit(message.Message, args);
    }

    export function AddServerHandler<T>(socket: Socket, message: Message<T>, handler: (args: T) => any) {
        socket.on(message.Message, loggingCallback('Incoming', handler, message.Name));
    }

    export function AddServerHandlerCallback<T>(socket: Socket, message: Message<T>, handler: (args: [T, (res: any) => any]) => any) {
        socket.on(message.Message, (arg: T, fn: (res: any) => any) => {
            log('S receiving', message.Name, arg, true);
            handler([arg, loggingCallback('S sending', fn, message.Name)]);
        });
    }
    export type RoomHandler = (socket: Socket, room: string) => any;
    export type UsedSockets = Socket;
    export type RoomMessage = 'create or join' | 'created' | 'joined';
    export function AddRoomHandler(socket: Socket, message: RoomMessage, handler: RoomHandler) {
        socket.on(message, (room: any) => handler(socket, room));
    }
}

export function OmitKeys(obj: any, keys: string[], pattern?: string, addKeyFunc?: (dup: any) => void): { omit: any; extract: any } {
    const omit: any = { ...obj };
    const extract: any = {};
    keys.forEach(key => {
        extract[key] = omit[key];
        delete omit[key];
    });
    pattern &&
        Array.from(Object.keys(omit))
            .filter(key => key.match(pattern))
            .forEach(key => {
                extract[key] = omit[key];
                delete omit[key];
            });
    addKeyFunc?.(omit);
    return { omit, extract };
}

export function WithKeys(obj: any, keys: string[], addKeyFunc?: (dup: any) => void) {
    const dup: any = {};
    keys.forEach(key => (dup[key] = obj[key]));
    addKeyFunc && addKeyFunc(dup);
    return dup;
}

export function timenow() {
    const now = new Date();
    let ampm = 'am';
    let h = now.getHours();
    let m: any = now.getMinutes();
    const s: any = now.getSeconds();
    if (h >= 12) {
        if (h > 12) h -= 12;
        ampm = 'pm';
    }
    if (m < 10) m = '0' + m;
    return now.toLocaleDateString() + ' ' + h + ':' + m + ' ' + ampm;
}

export function incrementTitleCopy(title: string) {
    const numstr = title.match(/.*(\{([0-9]*)\})+/);
    const copyNumStr = `{${1 + (numstr ? +numstr[2] : 0)}}`;
    return (numstr ? title.replace(numstr[1], '') : title) + copyNumStr;
}

export function formatTime(time: number) {
    time = Math.round(time);
    const hours = Math.floor(time / 60 / 60);
    const minutes = Math.floor(time / 60) - hours * 60;
    const seconds = time % 60;
    return (hours ? hours.toString() + ':' : '') + minutes.toString().padStart(2, '0') + ':' + seconds.toString().padStart(2, '0');
}

// x is furthest left, y is furthest top, r is furthest right, b is furthest bottom
export function aggregateBounds(boundsList: { x: number; y: number; width?: number; height?: number }[], xpad: number, ypad: number) {
    const bounds = boundsList
        .map(b => ({ x: b.x, y: b.y, r: b.x + (b.width || 0), b: b.y + (b.height || 0) }))
        .reduce(
            (bounds, b) => ({
                x: Math.min(b.x, bounds.x),
                y: Math.min(b.y, bounds.y),
                r: Math.max(b.r, bounds.r),
                b: Math.max(b.b, bounds.b),
            }),
            { x: Number.MAX_VALUE, y: Number.MAX_VALUE, r: -Number.MAX_VALUE, b: -Number.MAX_VALUE }
        );
    return {
        x: bounds.x !== Number.MAX_VALUE ? bounds.x - xpad : bounds.x,
        y: bounds.y !== Number.MAX_VALUE ? bounds.y - ypad : bounds.y,
        r: bounds.r !== -Number.MAX_VALUE ? bounds.r + xpad : bounds.r,
        b: bounds.b !== -Number.MAX_VALUE ? bounds.b + ypad : bounds.b,
    };
}
export function intersectRect(r1: { left: number; top: number; width: number; height: number }, r2: { left: number; top: number; width: number; height: number }) {
    return !(r2.left > r1.left + r1.width || r2.left + r2.width < r1.left || r2.top > r1.top + r1.height || r2.top + r2.height < r1.top);
}

export function stringHash(s?: string) {
    return !s ? undefined : Math.abs(s.split('').reduce((a: any, b: any) => (a => a & a)((a << 5) - a + b.charCodeAt(0)), 0));
}

export function percent2frac(percent: string) {
    return Number(percent.substr(0, percent.length - 1)) / 100;
}

export function numberRange(num: number) {
    return num > 0 && num < 1000 ? Array.from(Array(num)).map((v, i) => i) : [];
}

export function returnTransparent() {
    return 'transparent';
}

export function returnTrue() {
    return true;
}

export function returnIgnore(): 'ignore' {
    return 'ignore';
}
export function returnAlways(): 'always' {
    return 'always';
}
export function returnNever(): 'never' {
    return 'never';
}

export function returnDefault(): 'default' {
    return 'default';
}

export function return18() {
    return 18;
}

export function returnFalse() {
    return false;
}

export function returnAll(): 'all' {
    return 'all';
}

export function returnNone(): 'none' {
    return 'none';
}

export function returnVal(val1?: number, val2?: number) {
    return val1 ? val1 : val2 !== undefined ? val2 : 0;
}

export function returnOne() {
    return 1;
}

export function returnZero() {
    return 0;
}

export function returnEmptyString() {
    return '';
}

export function returnEmptyFilter() {
    return [] as string[];
}

export function returnEmptyDoclist() {
    return [] as any[];
}

export let emptyPath: DocumentView[] = [];

export function emptyFunction() {
    return undefined;
}

export function unimplementedFunction() {
    throw new Error('This function is not implemented, but should be.');
}

export type Without<T, K extends keyof T> = Pick<T, Exclude<keyof T, K>>;

export type Predicate<K, V> = (entry: [K, V]) => boolean;

export function DeepCopy<K, V>(source: Map<K, V>, predicate?: Predicate<K, V>) {
    const deepCopy = new Map<K, V>();
    const entries = source.entries();
    let next = entries.next();
    while (!next.done) {
        const entry = next.value;
        if (!predicate || predicate(entry)) {
            deepCopy.set(entry[0], entry[1]);
        }
        next = entries.next();
    }
    return deepCopy;
}

export namespace JSONUtils {
    export function tryParse(source: string) {
        let results: any;
        try {
            results = JSON.parse(source);
        } catch (e) {
            results = source;
        }
        return results;
    }
}

const easeFunc = (transition: 'ease' | 'linear' | undefined, currentTime: number, start: number, change: number, duration: number) => {
    if (transition === 'linear') {
        let newCurrentTime = currentTime / duration; //  currentTime / (duration / 2);
        return start + newCurrentTime * change;
    }

    let newCurrentTime = currentTime / (duration / 2);
    if (newCurrentTime < 1) {
        return (change / 2) * newCurrentTime * newCurrentTime + start;
    }

    newCurrentTime -= 1;
    return (-change / 2) * (newCurrentTime * (newCurrentTime - 2) - 1) + start;
};

export function smoothScroll(duration: number, element: HTMLElement | HTMLElement[], to: number, transition: 'ease' | 'linear' | undefined, stopper?: () => void) {
    stopper?.();
    const elements = element instanceof HTMLElement ? [element] : element;
    const starts = elements.map(element => element.scrollTop);
    const startDate = new Date().getTime();
    let _stop = false;
    const stop = () => (_stop = true);
    const animateScroll = () => {
        const currentDate = new Date().getTime();
        const currentTime = currentDate - startDate;
        const setScrollTop = (element: HTMLElement, value: number) => (element.scrollTop = value);
        if (!_stop) {
            if (currentTime < duration) {
                elements.forEach((element, i) => currentTime && setScrollTop(element, easeFunc(transition, Math.min(currentTime, duration), starts[i], to - starts[i], duration)));
                requestAnimationFrame(animateScroll);
            } else {
                elements.forEach(element => setScrollTop(element, to));
            }
        }
    };
    animateScroll();
    return stop;
}

export function smoothScrollHorizontal(duration: number, element: HTMLElement | HTMLElement[], to: number) {
    const elements = element instanceof HTMLElement ? [element] : element;
    const starts = elements.map(element => element.scrollLeft);
    const startDate = new Date().getTime();

    const animateScroll = () => {
        const currentDate = new Date().getTime();
        const currentTime = currentDate - startDate;
        elements.map((element, i) => (element.scrollLeft = easeFunc('ease', currentTime, starts[i], to - starts[i], duration)));

        if (currentTime < duration) {
            requestAnimationFrame(animateScroll);
        } else {
            elements.forEach(element => (element.scrollLeft = to));
        }
    };
    animateScroll();
}

export function addStyleSheet(styleType: string = 'text/css') {
    const style = document.createElement('style');
    style.type = styleType;
    const sheets = document.head.appendChild(style);
    return (sheets as any).sheet;
}
export function addStyleSheetRule(sheet: any, selector: any, css: any, selectorPrefix = '.') {
    const propText =
        typeof css === 'string'
            ? css
            : Object.keys(css)
                  .map(p => p + ':' + (p === 'content' ? "'" + css[p] + "'" : css[p]))
                  .join(';');
    return sheet.insertRule(selectorPrefix + selector + '{' + propText + '}', sheet.cssRules.length);
}
export function removeStyleSheetRule(sheet: any, rule: number) {
    if (sheet.rules.length) {
        sheet.removeRule(rule);
        return true;
    }
    return false;
}
export function clearStyleSheetRules(sheet: any) {
    if (sheet.rules.length) {
        numberRange(sheet.rules.length).map(n => sheet.removeRule(0));
        return true;
    }
    return false;
}

export function simulateMouseClick(element: Element | null | undefined, x: number, y: number, sx: number, sy: number, rightClick = true) {
    if (!element) return;
    ['pointerdown', 'pointerup'].map(event => {
        const me = new PointerEvent(event, {
            view: window,
            bubbles: true,
            cancelable: true,
            button: 2,
            pointerType: 'mouse',
            clientX: x,
            clientY: y,
            screenX: sx,
            screenY: sy,
        });
        (me as any).dash = true;
        element.dispatchEvent(me);
    });

    if (rightClick) {
        const me = new MouseEvent('contextmenu', {
            view: window,
            bubbles: true,
            cancelable: true,
            button: 2,
            clientX: x,
            clientY: y,
            movementX: 0,
            movementY: 0,
            screenX: sx,
            screenY: sy,
        });
        (me as any).dash = true;
        element.dispatchEvent(me);
    }
}

export function DashColor(color: string) {
    try {
        return color ? Color(color.toLowerCase()) : Color('transparent');
    } catch (e) {
        if (color.includes('gradient')) console.log("using color 'white' in place of :" + color);
        else console.log('COLOR error:', e);
        return Color('white');
    }
}

export function lightOrDark(color: any) {
    if (color === 'transparent' || !color) return Colors.BLACK;
    if (color.startsWith?.('linear')) return Colors.BLACK;
    if (DashColor(color).isLight()) return Colors.BLACK;
    return Colors.WHITE;
}

export function getWordAtPoint(elem: any, x: number, y: number): string | undefined {
    if (elem.tagName === 'INPUT') return 'input';
    if (elem.tagName === 'TEXTAREA') return 'textarea';
    if (elem.nodeType === elem.TEXT_NODE) {
        const range = elem.ownerDocument.createRange();
        range.selectNodeContents(elem);
        var currentPos = 0;
        const endPos = range.endOffset;
        while (currentPos + 1 <= endPos) {
            range.setStart(elem, currentPos);
            range.setEnd(elem, currentPos + 1);
            const rangeRect = range.getBoundingClientRect();
            if (rangeRect.left <= x && rangeRect.right >= x && rangeRect.top <= y && rangeRect.bottom >= y) {
                range.expand?.('word'); // doesn't exist in firefox
                const ret = range.toString();
                range.detach();
                return ret;
            }
            currentPos += 1;
        }
    } else {
        for (const childNode of elem.childNodes) {
            const range = childNode.ownerDocument.createRange();
            range.selectNodeContents(childNode);
            const rangeRect = range.getBoundingClientRect();
            if (rangeRect.left <= x && rangeRect.right >= x && rangeRect.top <= y && rangeRect.bottom >= y) {
                range.detach();
                const word = getWordAtPoint(childNode, x, y);
                if (word) return word;
            } else {
                range.detach();
            }
        }
    }
    return undefined;
}

export function isTargetChildOf(ele: HTMLDivElement | null, target: Element | null) {
    let entered = false;
    for (let child = target; !entered && child; child = child.parentElement) {
        entered = child === ele;
    }
    return entered;
}

export function StopEvent(e: React.PointerEvent | React.MouseEvent) {
    e.stopPropagation();
    e.preventDefault();
}

/**
 * Helper method for converting pixel string eg. '32px' into number eg. 32
 * @param value: string with 'px' ending
 * @returns value: number
 *
 * Example:
 * '32px' -> 32
 */
export function numberValue(value: string | undefined): number {
    if (value == undefined) return 0;
    return parseInt(value);
}

export function numbersAlmostEqual(num1: number, num2: number) {
    return Math.abs(num1 - num2) < 0.2;
}

export function setupMoveUpEvents(
    target: object,
    e: React.PointerEvent,
    moveEvent: (e: PointerEvent, down: number[], delta: number[]) => boolean,
    upEvent: (e: PointerEvent, movement: number[], isClick: boolean) => any,
    clickEvent: (e: PointerEvent, doubleTap?: boolean) => any,
    stopPropagation: boolean = true,
    stopMovePropagation: boolean = true,
    noDoubleTapTimeout?: () => void
) {
    const doubleTapTimeout = 300;
    (target as any)._doubleTap = Date.now() - (target as any)._lastTap < doubleTapTimeout;
    (target as any)._lastTap = Date.now();
    (target as any)._downX = (target as any)._lastX = e.clientX;
    (target as any)._downY = (target as any)._lastY = e.clientY;
    (target as any)._noClick = false;
    var moving = false;

    const _moveEvent = (e: PointerEvent): void => {
        if (moving || Math.abs(e.clientX - (target as any)._downX) > Utils.DRAG_THRESHOLD || Math.abs(e.clientY - (target as any)._downY) > Utils.DRAG_THRESHOLD) {
            moving = true;
            if ((target as any)._doubleTime) {
                clearTimeout((target as any)._doubleTime);
                (target as any)._doubleTime = undefined;
            }
            if (moveEvent(e, [(target as any)._downX, (target as any)._downY], [e.clientX - (target as any)._lastX, e.clientY - (target as any)._lastY])) {
                document.removeEventListener('pointermove', _moveEvent);
                document.removeEventListener('pointerup', _upEvent);
            }
        }
        (target as any)._lastX = e.clientX;
        (target as any)._lastY = e.clientY;
        stopMovePropagation && e.stopPropagation();
    };
    const _upEvent = (e: PointerEvent): void => {
        const isClick = Math.abs(e.clientX - (target as any)._downX) < 4 && Math.abs(e.clientY - (target as any)._downY) < 4;
        upEvent(e, [e.clientX - (target as any)._downX, e.clientY - (target as any)._downY], isClick);
        if (isClick) {
            if (!(target as any)._doubleTime && noDoubleTapTimeout) {
                (target as any)._doubleTime = setTimeout(() => {
                    noDoubleTapTimeout?.();
                    (target as any)._doubleTime = undefined;
                }, doubleTapTimeout);
            }
            if ((target as any)._doubleTime && (target as any)._doubleTap) {
                clearTimeout((target as any)._doubleTime);
                (target as any)._doubleTime = undefined;
            }
            (target as any)._noClick = clickEvent(e, (target as any)._doubleTap);
        }
        document.removeEventListener('pointermove', _moveEvent);
        document.removeEventListener('pointerup', _upEvent, true);
    };
    const _clickEvent = (e: MouseEvent): void => {
        if ((target as any)._noClick) e.stopPropagation();
        document.removeEventListener('click', _clickEvent, true);
    };
    if (stopPropagation) {
        e.stopPropagation();
        e.preventDefault();
    }
    document.addEventListener('pointermove', _moveEvent);
    document.addEventListener('pointerup', _upEvent, true);
    document.addEventListener('click', _clickEvent, true);
}

export function DivHeight(ele: HTMLElement): number {
    return Number(getComputedStyle(ele).height.replace('px', ''));
}
export function DivWidth(ele: HTMLElement): number {
    return Number(getComputedStyle(ele).width.replace('px', ''));
}

export function dateRangeStrToDates(dateStr: string) {
    // dateStr in yyyy-mm-dd format
    const dateRangeParts = dateStr.split('|'); // splits into from and to date
    const fromParts = dateRangeParts[0].split('-');
    const toParts = dateRangeParts[1].split('-');

    const fromYear = parseInt(fromParts[0]);
    const fromMonth = parseInt(fromParts[1]) - 1;
    const fromDay = parseInt(fromParts[2]);

    const toYear = parseInt(toParts[0]);
    const toMonth = parseInt(toParts[1]) - 1;
    const toDay = parseInt(toParts[2]);

    return [new Date(fromYear, fromMonth, fromDay), new Date(toYear, toMonth, toDay)];
}