import { getCrypto,utils as coreUtils } from "@triliumnext/core";
import chardet from "chardet";
import crypto from "crypto";
import { t } from "i18next";
import { release as osRelease } from "os";
import path from "path";
import stripBom from "strip-bom";

import log from "./log.js";
import type NoteMeta from "./meta/note_meta.js";

const osVersion = osRelease().split('.').map(Number);

export const isMac = process.platform === "darwin";

export const isWindows = process.platform === "win32";

export const isWindows11 = isWindows && osVersion[0] === 10 && osVersion[2] >= 22000;

export const isElectron = !!process.versions["electron"];

export const isDev = !!(process.env.TRILIUM_ENV && process.env.TRILIUM_ENV === "dev");

/** @deprecated */
export function newEntityId() {
    return coreUtils.newEntityId();
}

/** @deprecated */
export function randomString(length: number): string {
    return coreUtils.randomString(length);
}

export function md5(content: crypto.BinaryLike) {
    return crypto.createHash("md5").update(content).digest("hex");
}

/** @deprecated */
export function hashedBlobId(content: string | Buffer) {
    return coreUtils.hashedBlobId(content);
}

export function toBase64(plainText: string | Buffer) {
    const buffer = (Buffer.isBuffer(plainText) ? plainText : Buffer.from(plainText));
    return buffer.toString("base64");
}

export function fromBase64(encodedText: string) {
    return Buffer.from(encodedText, "base64");
}

export function hmac(secret: string | Uint8Array, value: string | Uint8Array) {
    return getCrypto().hmac(secret, value);
}

/**
 * Constant-time string comparison to prevent timing attacks.
 * Uses crypto.timingSafeEqual to ensure comparison time is independent
 * of how many characters match.
 *
 * @param a First string to compare
 * @param b Second string to compare
 * @returns true if strings are equal, false otherwise
 * @note Returns false for null/undefined/non-string inputs. Empty strings are considered equal.
 */
export function constantTimeCompare(a: string | null | undefined, b: string | null | undefined): boolean {
    // Handle null/undefined/non-string cases safely
    if (typeof a !== "string" || typeof b !== "string") {
        return false;
    }

    const bufA = Buffer.from(a, "utf-8");
    const bufB = Buffer.from(b, "utf-8");

    // If lengths differ, we still do a constant-time comparison
    // to avoid leaking length information through timing
    if (bufA.length !== bufB.length) {
        // Compare bufA against itself to maintain constant time behavior
        crypto.timingSafeEqual(bufA, bufA);
        return false;
    }

    return crypto.timingSafeEqual(bufA, bufB);
}

export function toObject<T, K extends string | number | symbol, V>(array: T[], fn: (item: T) => [K, V]): Record<K, V> {
    const obj: Record<K, V> = {} as Record<K, V>; // TODO: unsafe?

    for (const item of array) {
        const ret = fn(item);

        obj[ret[0]] = ret[1];
    }

    return obj;
}

export function stripTags(text: string) {
    return text.replace(/<(?:.|\n)*?>/gm, "");
}

/** @deprecated */
export function getContentDisposition(filename: string) {
    return coreUtils.getContentDisposition(filename);
}

/** @deprecated */
export function isStringNote(type: string | undefined, mime: string) {
    return coreUtils.isStringNote(type, mime);
}

/** @deprecated */
export function quoteRegex(url: string) {
    return coreUtils.quoteRegex(url);
}

/** @deprecated */
export function replaceAll(string: string, replaceWhat: string, replaceWith: string) {
    return coreUtils.replaceAll(string, replaceWhat, replaceWith);
}

/** @deprecated */
export function formatDownloadTitle(fileName: string, type: string | null, mime: string) {
    return coreUtils.formatDownloadTitle(fileName, type, mime);
}

export function removeFileExtension(filePath: string, mime?: string) {
    const extension = path.extname(filePath).toLowerCase();

    if (mime?.startsWith("video/") || mime?.startsWith("audio/")) {
        return filePath.substring(0, filePath.length - extension.length);
    }

    switch (extension) {
        case ".md":
        case ".mdx":
        case ".markdown":
        case ".html":
        case ".htm":
        case ".excalidraw":
        case ".mermaid":
        case ".mmd":
        case ".pdf":
            return filePath.substring(0, filePath.length - extension.length);
        default:
            return filePath;
    }
}

export function getNoteTitle(filePath: string, replaceUnderscoresWithSpaces: boolean, noteMeta?: NoteMeta) {
    const trimmedNoteMeta = noteMeta?.title?.trim();
    if (trimmedNoteMeta) return trimmedNoteMeta;

    const basename = path.basename(removeFileExtension(filePath, noteMeta?.mime));
    return replaceUnderscoresWithSpaces ? basename.replace(/_/g, " ").trim() : basename;
}

/** @deprecated */
export function removeDiacritic(str: string) {
    return coreUtils.removeDiacritic(str);
}

/** @deprecated */
export function normalize(str: string) {
    return coreUtils.normalize(str);
}

/** @deprecated */
export function toMap<T extends Record<string, any>>(list: T[], key: keyof T) {
    return coreUtils.toMap(list, key);
}

// try to turn 'true' and 'false' strings from process.env variables into boolean values or undefined
export function envToBoolean(val: string | undefined) {
    if (val === undefined || typeof val !== "string") return undefined;

    const valLc = val.toLowerCase().trim();

    if (valLc === "true") return true;
    if (valLc === "false") return false;

    return undefined;
}

/**
 * Parses a string value to an integer. If the resulting number is NaN or undefined, the result is also undefined.
 *
 * @param val the value to parse.
 * @returns the parsed value.
 */
export function stringToInt(val: string | undefined) {
    if (!val) {
        return undefined;
    }

    const parsed = parseInt(val, 10);
    if (Number.isNaN(parsed)) {
        return undefined;
    }

    return parsed;
}

/**
 * Returns the directory for resources. On Electron builds this corresponds to the `resources` subdirectory inside the distributable package.
 * On development builds, this simply refers to the src directory of the application.
 *
 * @returns the resource dir.
 */
export function getResourceDir() {
    if (process.env.TRILIUM_RESOURCE_DIR) {
        return process.env.TRILIUM_RESOURCE_DIR;
    }

    if (isElectron && !isDev) return __dirname;
    if (!isDev) {
        return path.dirname(process.argv[1]);
    }

    return path.join(__dirname, "..");
}

// TODO: Deduplicate with src/public/app/services/utils.ts
/**
 * 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;
}

/**
 * For buffers, they are scanned for a supported encoding and decoded (UTF-8, UTF-16). In some cases, the BOM is also stripped.
 *
 * For strings, they are returned immediately without any transformation.
 *
 * For nullish values, an empty string is returned.
 *
 * @param data the string or buffer to process.
 * @returns the string representation of the buffer, or the same string is it's a string.
 */
export function processStringOrBuffer(data: string | Buffer | null) {
    if (!data) {
        return "";
    }

    if (!Buffer.isBuffer(data)) {
        return data;
    }

    const detectedEncoding = chardet.detect(data);
    switch (detectedEncoding) {
        case "UTF-16LE":
            return stripBom(data.toString("utf-16le"));
        case "UTF-8":
        default:
            return data.toString("utf-8");
    }
}

/**
 * Normalizes a path pattern for custom request handlers.
 * Ensures both trailing slash and non-trailing slash versions are handled.
 *
 * @param pattern The original pattern from customRequestHandler attribute
 * @returns An array of patterns to match both with and without trailing slash
 */
export function normalizeCustomHandlerPattern(pattern: string | null | undefined): (string | null | undefined)[] {
    if (!pattern || typeof pattern !== 'string') {
        return [pattern];
    }

    pattern = pattern.trim();

    if (!pattern) {
        return [pattern];
    }

    // If pattern already ends with optional trailing slash, return as-is
    if (pattern.endsWith('/?$') || pattern.endsWith('/?)')) {
        return [pattern];
    }

    // If pattern ends with $, handle it specially
    if (pattern.endsWith('$')) {
        const basePattern = pattern.slice(0, -1);

        // If already ends with slash, create both versions
        if (basePattern.endsWith('/')) {
            const withoutSlash = `${basePattern.slice(0, -1)  }$`;
            const withSlash = pattern;
            return [withoutSlash, withSlash];
        }
        // Add optional trailing slash
        const withSlash = `${basePattern  }/?$`;
        return [withSlash];

    }

    // For patterns without $, add both versions
    if (pattern.endsWith('/')) {
        const withoutSlash = pattern.slice(0, -1);
        return [withoutSlash, pattern];
    }
    const withSlash = `${pattern  }/`;
    return [pattern, withSlash];

}

export function formatUtcTime(time: string) {
    return time.replace("T", " ").substring(0, 19);
}

// TODO: Deduplicate with client utils
export function formatSize(size: number | null | undefined) {
    if (size === null || size === undefined) {
        return "";
    }

    size = Math.max(Math.round(size / 1024), 1);

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

}

function slugify(text: string) {
    return text
        .normalize("NFC") // keep composed form, preserves accents
        .toLowerCase()
        .replace(/[^\p{Letter}\p{Number}]+/gu, "-") // replace non-letter/number with "-"
        .replace(/(^-|-$)+/g, ""); // trim dashes
}

/** @deprecated */
export const escapeHtml = coreUtils.escapeHtml;
/** @deprecated */
export const escapeRegExp = coreUtils.escapeRegExp;
/** @deprecated */
export const unescapeHtml = coreUtils.unescapeHtml;
/** @deprecated */
export const randomSecureToken = coreUtils.randomSecureToken;
/** @deprecated */
export const safeExtractMessageAndStackFromError = coreUtils.safeExtractMessageAndStackFromError;
/** @deprecated */
export const isEmptyOrWhitespace = coreUtils.isEmptyOrWhitespace;
/** @deprecated */
export const normalizeUrl = coreUtils.normalizeUrl;
export const timeLimit = coreUtils.timeLimit;
export const sanitizeSqlIdentifier = coreUtils.sanitizeSqlIdentifier;

export function waitForStreamToFinish(stream: any): Promise<void> {
    return new Promise((resolve, reject) => {
        stream.on("finish", () => resolve());
        stream.on("error", (err) => reject(err));
    });
}

export default {
    compareVersions,
    constantTimeCompare,
    envToBoolean,
    escapeHtml,
    escapeRegExp,
    formatDownloadTitle,
    fromBase64,
    getContentDisposition,
    getNoteTitle,
    getResourceDir,
    hashedBlobId,
    hmac,
    isDev,
    isElectron,
    isEmptyOrWhitespace,
    isMac,
    isStringNote,
    isWindows,
    md5,
    newEntityId,
    normalize,
    normalizeCustomHandlerPattern,
    quoteRegex,
    randomSecureToken,
    randomString,
    removeDiacritic,
    removeFileExtension,
    replaceAll,
    safeExtractMessageAndStackFromError,
    stripTags,
    slugify,
    toBase64,
    toMap,
    toObject,
    unescapeHtml,
    waitForStreamToFinish
};