import fs from 'fs';
import cluster from 'cluster';
import path from 'path';
import * as superagent from 'superagent';
import proxyAgent from 'proxy-agent';
import serialize from 'serialize-javascript';
import Lru from 'lru-cache';

declare global {
    interface StringConstructor {
        random: (digit?: number) => string;
    }
    interface ArrayConstructor {
        isDiff: (a: any[], b: any[]) => boolean;
    }
    interface Date {
        format: (fmt?: string) => string;
    }
    interface Math {
        sum: (...args: Array<number[] | number>) => number;
    }
    interface SetConstructor {
        isSuperset: (set: Set<any>, subset: Set<any>) => boolean;
        intersection: <T>(setA: Set<T>, setB: Set<T>) => Set<T>;
        union: <T>(setA: Set<T>, setB: Set<T>) => Set<T>;
    }
}

const lru = new Lru(1000);

export function lrucache(target: any, funcName: string, obj: any) {
    const originalMethod = obj.value;
    obj.value = function func(...args: any[]) {
        const key = serialize({ funcName, args });
        let val = lru.get(key);
        if (val) return val;
        val = originalMethod.call(this, ...args);
        lru.set(key, val);
        return val;
    };
    return obj;
}

namespace Proxy {
    function getUrl() {
        return this._url;
    }
    function setUrl(v: string) {
        this._url = v;
        // eslint-disable-next-line no-use-before-define
        proxy.call(this, this._proxyUri);
    }
    function setupUrl(req: superagent.Request) {
        const desc = Object.getOwnPropertyDescriptor(req, 'url');
        if (desc.get === getUrl && desc.set === setUrl) return;
        // @ts-ignore
        req._url = req.url;
        desc.get = getUrl;
        desc.set = setUrl;
        delete desc.value;
        delete desc.writable;
        Object.defineProperty(req, 'url', desc);
    }
    function proxy(uri: string) {
        if (!uri) return this;
        setupUrl(this);
        const agent = proxyAgent(uri);
        if (agent) this.agent(agent);
        this._proxyUri = uri;
        return this;
    }
    export function setup(agent, uri = '') {
        const Request = agent.Request;
        if (Request) {
            Request.prototype.proxy = proxy;
            return agent;
        }
        return proxy.call(agent, uri);
    }
}

declare module 'superagent' {
    interface Request {
        proxy(url: string): this;
    }
}

Proxy.setup(superagent);

if (!cluster.worker) {
    // @ts-ignore
    cluster.worker = { id: 0 };
}

const dict = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890';

String.random = function random(digit = 32) {
    let str = '';
    for (let i = 1; i <= digit; i++) str += dict[Math.floor(Math.random() * 62)];
    return str;
};

Array.isDiff = function isDiff(a, b) {
    if (a.length !== b.length) return true;
    a.sort();
    b.sort();
    for (const i in a) {
        if (a[i] !== b[i]) return true;
    }
    return false;
};

Date.prototype.format = function formatDate(fmt = '%Y-%m-%d %H:%M:%S') {
    let m = this.getMonth() + 1;
    if (m < 10) m = `0${m}`;
    let d = this.getDate();
    if (d < 10) d = `0${d}`;
    let H = this.getHours();
    if (H < 10) H = `0${H}`;
    let M = this.getMinutes();
    if (M < 10) M = `0${M}`;
    let S = this.getSeconds();
    if (S < 10) S = `0${S}`;
    return fmt
        .replace('%Y', this.getFullYear())
        .replace('%m', m)
        .replace('%d', d)
        .replace('%H', H)
        .replace('%M', M)
        .replace('%S', S);
};

Math.sum = function sum(...args) {
    let s = 0;
    for (const i of args) {
        if (i instanceof Array) {
            for (const j of i) {
                s += j;
            }
        } else s += i;
    }
    return s;
};

Set.isSuperset = function isSuperset(set, subset) {
    for (const elem of subset) {
        if (!set.has(elem)) return false;
    }
    return true;
};

Set.union = function Union<T>(setA: Set<T>, setB: Set<T>) {
    const union = new Set(setA);
    for (const elem of setB) union.add(elem);
    return union;
};

Set.intersection = function Intersection<T>(setA: Set<T>, setB: Set<T>): Set<T> {
    const intersection = new Set();
    for (const elem of setB) {
        if (setA.has(elem)) intersection.add(elem);
    }
    // @ts-ignore
    return intersection;
};

export function folderSize(folderPath: string) {
    let size = 0;
    const _next = function a(p: string) {
        if (p) {
            const stats = fs.statSync(p);
            if (!stats.isDirectory() || stats.isSymbolicLink()) {
                if (!stats.isSymbolicLink()) size += stats.size;
            } else {
                size += stats.size;
                const files = fs.readdirSync(p);
                if (Array.isArray(files)) {
                    files.forEach((file) => {
                        _next(path.join(p, file));
                    });
                }
            }
        }
    };
    _next(folderPath);
    return size;
}

const TIME_RE = /^([0-9]+(?:\.[0-9]*)?)([mu]?)s?$/i;
const TIME_UNITS = { '': 1000, m: 1, u: 0.001 };
const MEMORY_RE = /^([0-9]+(?:\.[0-9]*)?)([kmg])b?$/i;
const MEMORY_UNITS = { k: 0.1, m: 1, g: 1024 };

export function parseTimeMS(str: string) {
    const match = TIME_RE.exec(str);
    if (!match) throw new Error(`${str} error parsing time`);
    return Math.floor(parseFloat(match[1]) * TIME_UNITS[match[2]]);
}

export function parseMemoryMB(str: string) {
    const match = MEMORY_RE.exec(str);
    if (!match) throw new Error(`${str} error parsing memory`);
    return Math.floor(parseFloat(match[1]) * MEMORY_UNITS[match[2]]);
}

export function isClass(obj: any, strict = false) {
    if (typeof obj !== 'function') return false;
    const str = obj.toString();
    if (obj.prototype === undefined) return false;
    if (obj.prototype.constructor !== obj) return false;
    if (str.slice(0, 5) === 'class') return true;
    if (Object.getOwnPropertyNames(obj.prototype).length >= 2) return true;
    if (/^function\s+\(|^function\s+anonymous\(/.test(str)) return false;
    if (strict && /^function\s+[A-Z]/.test(str)) return true;
    if (/\b\(this\b|\bthis[.[]\b/.test(str)) {
        if (!strict || /classCallCheck\(this/.test(str)) return true;
        return /^function\sdefault_\d+\s*\(/.test(str);
    }
    return false;
}