import dayjs from "dayjs";
import { Modal } from "bootstrap";
import type { ViewScope } from "./link.js";

function reloadFrontendApp(reason?: string) {
    if (reason) {
        logInfo(`Frontend app reload: ${reason}`);
    }

    window.location.reload();
}

function restartDesktopApp() {
    if (!isElectron()) {
        reloadFrontendApp();
        return;
    }

    const app = dynamicRequire("@electron/remote").app;
    app.relaunch();
    app.exit();
}

/**
 * Triggers the system tray to update its menu items, i.e. after a change in dynamic content such as bookmarks or recent notes.
 *
 * On any other platform than Electron, nothing happens.
 */
function reloadTray() {
    if (!isElectron()) {
        return;
    }

    const { ipcRenderer } = dynamicRequire("electron");
    ipcRenderer.send("reload-tray");
}

function parseDate(str: string) {
    try {
        return new Date(Date.parse(str));
    } catch (e: any) {
        throw new Error(`Can't parse date from '${str}': ${e.message} ${e.stack}`);
    }
}

// Source: https://stackoverflow.com/a/30465299/4898894
function getMonthsInDateRange(startDate: string, endDate: string) {
    const start = startDate.split("-");
    const end = endDate.split("-");
    const startYear = parseInt(start[0]);
    const endYear = parseInt(end[0]);
    const dates = [];

    for (let i = startYear; i <= endYear; i++) {
        const endMonth = i != endYear ? 11 : parseInt(end[1]) - 1;
        const startMon = i === startYear ? parseInt(start[1]) - 1 : 0;

        for (let j = startMon; j <= endMonth; j = j > 12 ? j % 12 || 11 : j + 1) {
            const month = j + 1;
            const displayMonth = month < 10 ? "0" + month : month;
            dates.push([i, displayMonth].join("-"));
        }
    }
    return dates;
}

function padNum(num: number) {
    return `${num <= 9 ? "0" : ""}${num}`;
}

function formatTime(date: Date) {
    return `${padNum(date.getHours())}:${padNum(date.getMinutes())}`;
}

function formatTimeWithSeconds(date: Date) {
    return `${padNum(date.getHours())}:${padNum(date.getMinutes())}:${padNum(date.getSeconds())}`;
}

function formatTimeInterval(ms: number) {
    const seconds = Math.round(ms / 1000);
    const minutes = Math.floor(seconds / 60);
    const hours = Math.floor(minutes / 60);
    const days = Math.floor(hours / 24);
    const plural = (count: number, name: string) => `${count} ${name}${count > 1 ? "s" : ""}`;
    const segments = [];

    if (days > 0) {
        segments.push(plural(days, "day"));
    }

    if (days < 2) {
        if (hours % 24 > 0) {
            segments.push(plural(hours % 24, "hour"));
        }

        if (hours < 4) {
            if (minutes % 60 > 0) {
                segments.push(plural(minutes % 60, "minute"));
            }

            if (minutes < 5) {
                if (seconds % 60 > 0) {
                    segments.push(plural(seconds % 60, "second"));
                }
            }
        }
    }

    return segments.join(", ");
}

/** this is producing local time! **/
function formatDate(date: Date) {
    //    return padNum(date.getDate()) + ". " + padNum(date.getMonth() + 1) + ". " + date.getFullYear();
    // instead of european format we'll just use ISO as that's pretty unambiguous

    return formatDateISO(date);
}

/** this is producing local time! **/
function formatDateISO(date: Date) {
    return `${date.getFullYear()}-${padNum(date.getMonth() + 1)}-${padNum(date.getDate())}`;
}

function formatDateTime(date: Date) {
    return `${formatDate(date)} ${formatTime(date)}`;
}

function localNowDateTime() {
    return dayjs().format("YYYY-MM-DD HH:mm:ss.SSSZZ");
}

function now() {
    return formatTimeWithSeconds(new Date());
}

/**
 * Returns `true` if the client is currently running under Electron, or `false` if running in a web browser.
 */
function isElectron() {
    return !!(window && window.process && window.process.type);
}

function isMac() {
    return navigator.platform.indexOf("Mac") > -1;
}

function isCtrlKey(evt: KeyboardEvent | MouseEvent | JQuery.ClickEvent | JQuery.ContextMenuEvent | JQuery.TriggeredEvent | React.PointerEvent<HTMLCanvasElement>) {
    return (!isMac() && evt.ctrlKey) || (isMac() && evt.metaKey);
}

function assertArguments<T>(...args: T[]) {
    for (const i in args) {
        if (!args[i]) {
            console.trace(`Argument idx#${i} should not be falsy: ${args[i]}`);
        }
    }
}

const entityMap: Record<string, string> = {
    "&": "&amp;",
    "<": "&lt;",
    ">": "&gt;",
    '"': "&quot;",
    "'": "&#39;",
    "/": "&#x2F;",
    "`": "&#x60;",
    "=": "&#x3D;"
};

function escapeHtml(str: string) {
    return str.replace(/[&<>"'`=\/]/g, (s) => entityMap[s]);
}

export function escapeQuotes(value: string) {
    return value.replaceAll('"', "&quot;");
}

function formatSize(size: number) {
    size = Math.max(Math.round(size / 1024), 1);

    if (size < 1024) {
        return `${size} KiB`;
    } else {
        return `${Math.round(size / 102.4) / 10} MiB`;
    }
}

function toObject<T, R>(array: T[], fn: (arg0: T) => [key: string, value: R]) {
    const obj: Record<string, R> = {};

    for (const item of array) {
        const [key, value] = fn(item);

        obj[key] = value;
    }

    return obj;
}

function randomString(len: number) {
    let text = "";
    const possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

    for (let i = 0; i < len; i++) {
        text += possible.charAt(Math.floor(Math.random() * possible.length));
    }

    return text;
}

function isMobile() {
    return (
        window.glob?.device === "mobile" ||
        // window.glob.device is not available in setup
        (!window.glob?.device && /Mobi/.test(navigator.userAgent))
    );
}

function isDesktop() {
    return (
        window.glob?.device === "desktop" ||
        // window.glob.device is not available in setup
        (!window.glob?.device && !/Mobi/.test(navigator.userAgent))
    );
}

/**
 * the cookie code below works for simple use cases only - ASCII only
 * not setting a path so that cookies do not leak into other websites if multiplexed with reverse proxy
 */
function setCookie(name: string, value: string) {
    const date = new Date(Date.now() + 10 * 365 * 24 * 60 * 60 * 1000);
    const expires = `; expires=${date.toUTCString()}`;

    document.cookie = `${name}=${value || ""}${expires};`;
}

function getNoteTypeClass(type: string) {
    return `type-${type}`;
}

function getMimeTypeClass(mime: string) {
    if (!mime) {
        return "";
    }

    const semicolonIdx = mime.indexOf(";");

    if (semicolonIdx !== -1) {
        // stripping everything following the semicolon
        mime = mime.substr(0, semicolonIdx);
    }

    return `mime-${mime.toLowerCase().replace(/[\W_]+/g, "-")}`;
}

function closeActiveDialog() {
    if (glob.activeDialog) {
        Modal.getOrCreateInstance(glob.activeDialog[0]).hide();
        glob.activeDialog = null;
    }
}

let $lastFocusedElement: JQuery<HTMLElement> | null;

// perhaps there should be saved focused element per tab?
function saveFocusedElement() {
    $lastFocusedElement = $(":focus");
}

function focusSavedElement() {
    if (!$lastFocusedElement) {
        return;
    }

    if ($lastFocusedElement.hasClass("ck")) {
        // must handle CKEditor separately because of this bug: https://github.com/ckeditor/ckeditor5/issues/607
        // the bug manifests itself in resetting the cursor position to the first character - jumping above

        const editor = $lastFocusedElement.closest(".ck-editor__editable").prop("ckeditorInstance");

        if (editor) {
            editor.editing.view.focus();
        } else {
            console.log("Could not find CKEditor instance to focus last element");
        }
    } else {
        $lastFocusedElement.focus();
    }

    $lastFocusedElement = null;
}

async function openDialog($dialog: JQuery<HTMLElement>, closeActDialog = true) {
    if (closeActDialog) {
        closeActiveDialog();
        glob.activeDialog = $dialog;
    }

    saveFocusedElement();
    Modal.getOrCreateInstance($dialog[0]).show();

    $dialog.on("hidden.bs.modal", () => {
        const $autocompleteEl = $(".aa-input");
        if ("autocomplete" in $autocompleteEl) {
            $autocompleteEl.autocomplete("close");
        }

        if (!glob.activeDialog || glob.activeDialog === $dialog) {
            focusSavedElement();
        }
    });

    // TODO: Fix once keyboard_actions is ported.
    // @ts-ignore
    const keyboardActionsService = (await import("./keyboard_actions.js")).default;
    keyboardActionsService.updateDisplayedShortcuts($dialog);

    return $dialog;
}

function isHtmlEmpty(html: string) {
    if (!html) {
        return true;
    } else if (typeof html !== "string") {
        logError(`Got object of type '${typeof html}' where string was expected.`);
        return false;
    }

    html = html.toLowerCase();

    return (
        !html.includes("<img") &&
        !html.includes("<section") &&
        // the line below will actually attempt to load images so better to check for images first
        $("<div>").html(html).text().trim().length === 0
    );
}

async function clearBrowserCache() {
    if (isElectron()) {
        const win = dynamicRequire("@electron/remote").getCurrentWindow();
        await win.webContents.session.clearCache();
    }
}

function copySelectionToClipboard() {
    const text = window?.getSelection()?.toString();
    if (text && navigator.clipboard) {
        navigator.clipboard.writeText(text);
    }
}

function dynamicRequire(moduleName: string) {
    if (typeof __non_webpack_require__ !== "undefined") {
        return __non_webpack_require__(moduleName);
    } else {
        // explicitly pass as string and not as expression to suppress webpack warning
        // 'Critical dependency: the request of a dependency is an expression'
        return require(`${moduleName}`);
    }
}

function timeLimit<T>(promise: Promise<T>, limitMs: number, errorMessage?: string) {
    if (!promise || !promise.then) {
        // it's not actually a promise
        return promise;
    }

    // better stack trace if created outside of promise
    const error = new Error(errorMessage || `Process exceeded time limit ${limitMs}`);

    return new Promise<T>((res, rej) => {
        let resolved = false;

        promise.then((result) => {
            resolved = true;

            res(result);
        });

        setTimeout(() => {
            if (!resolved) {
                rej(error);
            }
        }, limitMs);
    });
}

function initHelpDropdown($el: JQuery<HTMLElement>) {
    // stop inside clicks from closing the menu
    const $dropdownMenu = $el.find(".help-dropdown .dropdown-menu");
    $dropdownMenu.on("click", (e) => e.stopPropagation());

    // previous propagation stop will also block help buttons from being opened, so we need to re-init for this element
    initHelpButtons($dropdownMenu);
}

const wikiBaseUrl = "https://triliumnext.github.io/Docs/Wiki/";

function openHelp($button: JQuery<HTMLElement>) {
    if ($button.length === 0) {
        return;
    }

    const helpPage = $button.attr("data-help-page");

    if (helpPage) {
        const url = wikiBaseUrl + helpPage;

        window.open(url, "_blank");
    }
}

async function openInAppHelp($button: JQuery<HTMLElement>) {
    if ($button.length === 0) {
        return;
    }

    const inAppHelpPage = $button.attr("data-in-app-help");
    if (inAppHelpPage) {
        // Dynamic import to avoid import issues in tests.
        const appContext = (await import("../components/app_context.js")).default;
        const activeContext = appContext.tabManager.getActiveContext();
        if (!activeContext) {
            return;
        }
        const subContexts = activeContext.getSubContexts();
        const targetNote = `_help_${inAppHelpPage}`;
        const helpSubcontext = subContexts.find((s) => s.viewScope?.viewMode === "contextual-help");
        const viewScope: ViewScope = {
            viewMode: "contextual-help",
        };
        if (!helpSubcontext) {
            // The help is not already open, open a new split with it.
            const { ntxId } = subContexts[subContexts.length - 1];
            appContext.triggerCommand("openNewNoteSplit", {
                ntxId,
                notePath: targetNote,
                hoistedNoteId: "_help",
                viewScope
            })
        } else {
            // There is already a help window open, make sure it opens on the right note.
            helpSubcontext.setNote(targetNote, { viewScope });
        }
        return;
    }
}

function initHelpButtons($el: JQuery<HTMLElement> | JQuery<Window>) {
    // for some reason, the .on(event, listener, handler) does not work here (e.g. Options -> Sync -> Help button)
    // so we do it manually
    $el.on("click", (e) => {
        openHelp($(e.target).closest("[data-help-page]"));
        openInAppHelp($(e.target).closest("[data-in-app-help]"));
    });
}

function filterAttributeName(name: string) {
    return name.replace(/[^\p{L}\p{N}_:]/gu, "");
}

const ATTR_NAME_MATCHER = new RegExp("^[\\p{L}\\p{N}_:]+$", "u");

function isValidAttributeName(name: string) {
    return ATTR_NAME_MATCHER.test(name);
}

function sleep(time_ms: number) {
    return new Promise((resolve) => {
        setTimeout(resolve, time_ms);
    });
}

function escapeRegExp(str: string) {
    return str.replace(/([.*+?^=!:${}()|\[\]\/\\])/g, "\\$1");
}

function areObjectsEqual(...args: unknown[]) {
    let i;
    let l;
    let leftChain: Object[];
    let rightChain: Object[];

    function compare2Objects(x: unknown, y: unknown) {
        let p;

        // remember that NaN === NaN returns false
        // and isNaN(undefined) returns true
        if (typeof x === "number" && typeof y === "number" && isNaN(x) && isNaN(y)) {
            return true;
        }

        // Compare primitives and functions.
        // Check if both arguments link to the same object.
        // Especially useful on the step where we compare prototypes
        if (x === y) {
            return true;
        }

        // Works in case when functions are created in constructor.
        // Comparing dates is a common scenario. Another built-ins?
        // We can even handle functions passed across iframes
        if (
            (typeof x === "function" && typeof y === "function") ||
            (x instanceof Date && y instanceof Date) ||
            (x instanceof RegExp && y instanceof RegExp) ||
            (x instanceof String && y instanceof String) ||
            (x instanceof Number && y instanceof Number)
        ) {
            return x.toString() === y.toString();
        }

        // At last, checking prototypes as good as we can
        if (!(x instanceof Object && y instanceof Object)) {
            return false;
        }

        if (x.isPrototypeOf(y) || y.isPrototypeOf(x)) {
            return false;
        }

        if (x.constructor !== y.constructor) {
            return false;
        }

        if ((x as any).prototype !== (y as any).prototype) {
            return false;
        }

        // Check for infinitive linking loops
        if (leftChain.indexOf(x) > -1 || rightChain.indexOf(y) > -1) {
            return false;
        }

        // Quick checking of one object being a subset of another.
        // todo: cache the structure of arguments[0] for performance
        for (p in y) {
            if (y.hasOwnProperty(p) !== x.hasOwnProperty(p)) {
                return false;
            } else if (typeof (y as any)[p] !== typeof (x as any)[p]) {
                return false;
            }
        }

        for (p in x) {
            if (y.hasOwnProperty(p) !== x.hasOwnProperty(p)) {
                return false;
            } else if (typeof (y as any)[p] !== typeof (x as any)[p]) {
                return false;
            }

            switch (typeof (x as any)[p]) {
                case "object":
                case "function":
                    leftChain.push(x);
                    rightChain.push(y);

                    if (!compare2Objects((x as any)[p], (y as any)[p])) {
                        return false;
                    }

                    leftChain.pop();
                    rightChain.pop();
                    break;

                default:
                    if ((x as any)[p] !== (y as any)[p]) {
                        return false;
                    }
                    break;
            }
        }

        return true;
    }

    if (arguments.length < 1) {
        return true; //Die silently? Don't know how to handle such case, please help...
        // throw "Need two or more arguments to compare";
    }

    for (i = 1, l = arguments.length; i < l; i++) {
        leftChain = []; //Todo: this can be cached
        rightChain = [];

        if (!compare2Objects(arguments[0], arguments[i])) {
            return false;
        }
    }

    return true;
}

function copyHtmlToClipboard(content: string) {
    function listener(e: ClipboardEvent) {
        if (e.clipboardData) {
            e.clipboardData.setData("text/html", content);
            e.clipboardData.setData("text/plain", content);
        }
        e.preventDefault();
    }
    document.addEventListener("copy", listener);
    document.execCommand("copy");
    document.removeEventListener("copy", listener);
}

// TODO: Set to FNote once the file is ported.
function createImageSrcUrl(note: { noteId: string; title: string }) {
    return `api/images/${note.noteId}/${encodeURIComponent(note.title)}?timestamp=${Date.now()}`;
}

/**
 * Given a string representation of an SVG, triggers a download of the file on the client device.
 *
 * @param nameWithoutExtension the name of the file. The .svg suffix is automatically added to it.
 * @param svgContent the content of the SVG file download.
 */
function downloadSvg(nameWithoutExtension: string, svgContent: string) {
    const filename = `${nameWithoutExtension}.svg`;
    const dataUrl = `data:image/svg+xml;charset=utf-8,${encodeURIComponent(svgContent)}`;
    triggerDownload(filename, dataUrl);
}

/**
 * Downloads the given data URL on the client device, with a custom file name.
 *
 * @param fileName the name to give the downloaded file.
 * @param dataUrl the data URI to download.
 */
function triggerDownload(fileName: string, dataUrl: string) {
    const element = document.createElement("a");
    element.setAttribute("href", dataUrl);
    element.setAttribute("download", fileName);

    element.style.display = "none";
    document.body.appendChild(element);

    element.click();

    document.body.removeChild(element);
}

/**
 * Given a string representation of an SVG, renders the SVG to PNG and triggers a download of the file on the client device.
 *
 * Note that the SVG must specify its width and height as attributes in order for it to be rendered.
 *
 * @param nameWithoutExtension the name of the file. The .png suffix is automatically added to it.
 * @param svgContent the content of the SVG file download.
 * @returns `true` if the operation succeeded (width/height present), or `false` if the download was not triggered.
 */
function downloadSvgAsPng(nameWithoutExtension: string, svgContent: string) {
    const mime = "image/svg+xml";

    // First, we need to determine the width and the height from the input SVG.
    const svgDocument = (new DOMParser()).parseFromString(svgContent, mime);
    const width = svgDocument.documentElement?.getAttribute("width");
    const height = svgDocument.documentElement?.getAttribute("height");

    if (!width || !height) {
        return false;
    }

    // Convert the image to a blob.
    const svgBlob = new Blob([ svgContent ], {
        type: mime
    })

    // Create an image element and load the SVG.
    const imageEl = new Image();
    imageEl.width = parseFloat(width);
    imageEl.height = parseFloat(height);
    imageEl.src = URL.createObjectURL(svgBlob);
    imageEl.onload = () => {
        // Draw the image with a canvas.
        const canvasEl = document.createElement("canvas");
        canvasEl.width = imageEl.width;
        canvasEl.height = imageEl.height;
        document.body.appendChild(canvasEl);

        const ctx = canvasEl.getContext("2d");
        ctx?.drawImage(imageEl, 0, 0);
        URL.revokeObjectURL(imageEl.src);

        const imgUri = canvasEl.toDataURL("image/png")
        triggerDownload(`${nameWithoutExtension}.png`, imgUri);
        document.body.removeChild(canvasEl);
    };

    return true;
}

/**
 * Compares two semantic version strings.
 * Returns:
 *   1  if v1 is greater than v2
 *   0  if v1 is equal to v2
 *   -1 if v1 is less than v2
 *
 * @param v1 First version string
 * @param v2 Second version string
 * @returns
 */
function compareVersions(v1: string, v2: string): number {
    // Remove 'v' prefix and everything after dash if present
    v1 = v1.replace(/^v/, "").split("-")[0];
    v2 = v2.replace(/^v/, "").split("-")[0];

    const v1parts = v1.split(".").map(Number);
    const v2parts = v2.split(".").map(Number);

    // Pad shorter version with zeros
    while (v1parts.length < 3) v1parts.push(0);
    while (v2parts.length < 3) v2parts.push(0);

    // Compare major version
    if (v1parts[0] !== v2parts[0]) {
        return v1parts[0] > v2parts[0] ? 1 : -1;
    }

    // Compare minor version
    if (v1parts[1] !== v2parts[1]) {
        return v1parts[1] > v2parts[1] ? 1 : -1;
    }

    // Compare patch version
    if (v1parts[2] !== v2parts[2]) {
        return v1parts[2] > v2parts[2] ? 1 : -1;
    }

    return 0;
}

/**
 * Compares two semantic version strings and returns `true` if the latest version is greater than the current version.
 */
function isUpdateAvailable(latestVersion: string | null | undefined, currentVersion: string): boolean {
    if (!latestVersion) {
        return false;
    }
    return compareVersions(latestVersion, currentVersion) > 0;
}

function isLaunchBarConfig(noteId: string) {
    return ["_lbRoot", "_lbAvailableLaunchers", "_lbVisibleLaunchers", "_lbMobileRoot", "_lbMobileAvailableLaunchers", "_lbMobileVisibleLaunchers"].includes(noteId);
}

export default {
    reloadFrontendApp,
    restartDesktopApp,
    reloadTray,
    parseDate,
    getMonthsInDateRange,
    formatDateISO,
    formatDateTime,
    formatTimeInterval,
    formatSize,
    localNowDateTime,
    now,
    isElectron,
    isMac,
    isCtrlKey,
    assertArguments,
    escapeHtml,
    toObject,
    randomString,
    isMobile,
    isDesktop,
    setCookie,
    getNoteTypeClass,
    getMimeTypeClass,
    closeActiveDialog,
    openDialog,
    saveFocusedElement,
    focusSavedElement,
    isHtmlEmpty,
    clearBrowserCache,
    copySelectionToClipboard,
    dynamicRequire,
    timeLimit,
    initHelpDropdown,
    initHelpButtons,
    openHelp,
    filterAttributeName,
    isValidAttributeName,
    sleep,
    escapeRegExp,
    areObjectsEqual,
    copyHtmlToClipboard,
    createImageSrcUrl,
    downloadSvg,
    downloadSvgAsPng,
    compareVersions,
    isUpdateAvailable,
    isLaunchBarConfig
};
