import { IPv4, IPv6 } from 'ip-num/IPNumber'
import { Ipv4Addr, Ipv4Inet, Ipv6Addr } from '../types/network'

export function ipv4ToString(ip: Ipv4Addr) {
    return IPv4.fromNumber(ip.addr).toString()
}

export function ipv4InetToString(ip: Ipv4Inet | undefined) {
    if (ip?.address === undefined) {
        return 'undefined'
    }
    return `${ipv4ToString(ip.address)}/${ip.network_length}`
}

export function ipv6ToString(ip: Ipv6Addr) {
    return IPv6.fromBigInt(
        (BigInt(ip.part1) << BigInt(96))
        + (BigInt(ip.part2) << BigInt(64))
        + (BigInt(ip.part3) << BigInt(32))
        + BigInt(ip.part4),
    )
}

function toHexString(uint64: bigint, padding = 9): string {
    let hexString = uint64.toString(16);
    while (hexString.length < padding) {
        hexString = '0' + hexString;
    }
    return hexString;
}

function uint32ToUuid(part1: number, part2: number, part3: number, part4: number): string {
    // 将两个 uint64 转换为 16 进制字符串
    const part1Hex = toHexString(BigInt(part1), 8);
    const part2Hex = toHexString(BigInt(part2), 8);
    const part3Hex = toHexString(BigInt(part3), 8);
    const part4Hex = toHexString(BigInt(part4), 8);

    // 构造 UUID 格式字符串
    const uuid = `${part1Hex.substring(0, 8)}-${part2Hex.substring(0, 4)}-${part2Hex.substring(4, 8)}-${part3Hex.substring(0, 4)}-${part3Hex.substring(4, 8)}${part4Hex.substring(0, 12)}`;

    return uuid;
}

export interface UUID {
    part1: number;
    part2: number;
    part3: number;
    part4: number;
}

export function UuidToStr(uuid: UUID): string {
    return uint32ToUuid(uuid.part1, uuid.part2, uuid.part3, uuid.part4);
}

export interface DeviceInfo {
    hostname: string;
    public_ip: string;
    running_network_count: number;
    report_time: string;
    easytier_version: string;
    running_network_instances?: Array<string>;
    machine_id: string;
}

export function buildDeviceInfo(device: any): DeviceInfo {
    let dev_info: DeviceInfo = {
        hostname: device.info?.hostname,
        public_ip: device.client_url,
        running_network_instances: device.info?.running_network_instances.map((instance: any) => UuidToStr(instance)),
        running_network_count: device.info?.running_network_instances.length,
        report_time: device.info?.report_time,
        easytier_version: device.info?.easytier_version,
        machine_id: UuidToStr(device.info?.machine_id),
    };

    return dev_info;
}

// write a class to run a function periodically and can be stopped by calling stop(), use setTimeout to trigger the function
export class PeriodicTask {
    private interval: number;
    private task: (() => Promise<void>) | undefined;
    private timer: any;

    constructor(task: () => Promise<void>, interval: number) {
        this.interval = interval;
        this.task = task;
    }

    _runTaskHelper(nextInterval: number) {
        this.timer = setTimeout(async () => {
            if (this.task) {
                await this.task();
                this._runTaskHelper(this.interval);
            }
        }, nextInterval);
    }

    start() {
        this._runTaskHelper(0);
    }

    stop() {
        this.task = undefined;
        clearTimeout(this.timer);
    }
}