import { MainRouter } from "./routers/main-router";
import * as fs from "node:fs";
import { PackageJson } from "type-fest";
import { Database } from "./database";
import packageJSON from "../package.json";
import { log } from "./log";
import * as socketIO from "socket.io";
import express, { Express } from "express";
import { parse } from "ts-command-line-args";
import https from "https";
import http from "http";
import { Router } from "./router";
import { Socket } from "socket.io";
import { MainSocketHandler } from "./socket-handlers/main-socket-handler";
import { SocketHandler } from "./socket-handler";
import { Settings } from "./settings";
import checkVersion from "./check-version";
import dayjs from "dayjs";
import { R } from "redbean-node";
import { genSecret, isDev } from "./util-common";
import { generatePasswordHash } from "./password-hash";
import { Bean } from "redbean-node/dist/bean";
import { DockgeSocket } from "./util-server";
import { DockerSocketHandler } from "./socket-handlers/docker-socket-handler";
import { Terminal } from "./terminal";

export interface Arguments {
    sslKey? : string;
    sslCert? : string;
    sslKeyPassphrase? : string;
    port? : number;
    hostname? : string;
    dataDir? : string;
}

export class DockgeServer {
    app : Express;
    httpServer : http.Server;
    packageJSON : PackageJson;
    io : socketIO.Server;
    config : Arguments;
    indexHTML : string;
    terminal : Terminal;

    /**
     * List of express routers
     */
    routerList : Router[] = [
        new MainRouter(),
    ];

    /**
     * List of socket handlers
     */
    socketHandlerList : SocketHandler[] = [
        new MainSocketHandler(),
        new DockerSocketHandler(),
    ];

    /**
     * Show Setup Page
     */
    needSetup = false;

    jwtSecret? : string;

    /**
     *
     */
    constructor() {
        if (!process.env.NODE_ENV) {
            process.env.NODE_ENV = "production";
        }

        // Log NODE ENV
        log.info("server", "NODE_ENV: " + process.env.NODE_ENV);

        // Load arguments
        const args = this.config = parse<Arguments>({
            sslKey: {
                type: String,
                optional: true,
            },
            sslCert: {
                type: String,
                optional: true,
            },
            sslKeyPassphrase: {
                type: String,
                optional: true,
            },
            port: {
                type: Number,
                optional: true,
            },
            hostname: {
                type: String,
                optional: true,
            },
            dataDir: {
                type: String,
                optional: true,
            }
        });

        // Load from environment variables or default values if args are not set
        args.sslKey = args.sslKey || process.env.DOCKGE_SSL_KEY || undefined;
        args.sslCert = args.sslCert || process.env.DOCKGE_SSL_CERT || undefined;
        args.sslKeyPassphrase = args.sslKeyPassphrase || process.env.DOCKGE_SSL_KEY_PASSPHRASE || undefined;
        args.port = args.port || parseInt(process.env.DOCKGE_PORT) || 5001;
        args.hostname = args.hostname || process.env.DOCKGE_HOSTNAME || undefined;
        args.dataDir = args.dataDir || process.env.DOCKGE_DATA_DIR || "./data/";

        log.debug("server", args);

        this.packageJSON = packageJSON as PackageJson;

        this.initDataDir();

        this.terminal = new Terminal(this);
    }

    /**
     *
     */
    async serve() {
        // Connect to database
        try {
            await Database.init(this);
        } catch (e) {
            log.error("server", "Failed to prepare your database: " + e.message);
            process.exit(1);
        }

        // First time setup if needed
        let jwtSecretBean = await R.findOne("setting", " `key` = ? ", [
            "jwtSecret",
        ]);

        if (! jwtSecretBean) {
            log.info("server", "JWT secret is not found, generate one.");
            jwtSecretBean = await this.initJWTSecret();
            log.info("server", "Stored JWT secret into database");
        } else {
            log.debug("server", "Load JWT secret from database.");
        }

        this.jwtSecret = jwtSecretBean.value;

        const userCount = (await R.knex("user").count("id as count").first()).count;

        log.debug("server", "User count: " + userCount);

        // If there is no record in user table, it is a new Dockge instance, need to setup
        if (userCount == 0) {
            log.info("server", "No user, need setup");
            this.needSetup = true;
        }

        // Create express
        this.app = express();

        if (this.config.sslKey && this.config.sslCert) {
            log.info("server", "Server Type: HTTPS");
            this.httpServer = https.createServer({
                key: fs.readFileSync(this.config.sslKey),
                cert: fs.readFileSync(this.config.sslCert),
                passphrase: this.config.sslKeyPassphrase,
            }, this.app);
        } else {
            log.info("server", "Server Type: HTTP");
            this.httpServer = http.createServer(this.app);
        }

        try {
            this.indexHTML = fs.readFileSync("./dist/index.html").toString();
        } catch (e) {
            // "dist/index.html" is not necessary for development
            if (process.env.NODE_ENV !== "development") {
                log.error("server", "Error: Cannot find 'dist/index.html', did you install correctly?");
                process.exit(1);
            }
        }

        for (const router of this.routerList) {
            this.app.use(router.create(this.app, this));
        }

        let cors = undefined;

        if (isDev) {
            cors = {
                origin: "*",
            };
        }

        // Create Socket.io
        this.io = new socketIO.Server(this.httpServer, {
            cors,
        });

        this.io.on("connection", (socket: Socket) => {
            log.info("server", "Socket connected!");

            this.sendInfo(socket, true);

            if (this.needSetup) {
                log.info("server", "Redirect to setup page");
                socket.emit("setup");
            }

            // Create socket handlers
            for (const socketHandler of this.socketHandlerList) {
                socketHandler.create(socket as DockgeSocket, this);
            }
        });

        // Listen
        this.httpServer.listen(5001, this.config.hostname, () => {
            if (this.config.hostname) {
                log.info( "server", `Listening on ${this.config.hostname}:${this.config.port}`);
            } else {
                log.info("server", `Listening on ${this.config.port}`);
            }
        });
    }

    /**
     * Emits the version information to the client.
     * @param socket Socket.io socket instance
     * @param hideVersion Should we hide the version information in the response?
     * @returns
     */
    async sendInfo(socket : Socket, hideVersion = false) {
        let versionProperty;
        let latestVersionProperty;
        let isContainer;

        if (!hideVersion) {
            versionProperty = packageJSON.version;
            latestVersionProperty = checkVersion.latestVersion;
            isContainer = (process.env.DOCKGE_IS_CONTAINER === "1");
        }

        socket.emit("info", {
            versionProperty,
            latestVersionProperty,
            isContainer,
            primaryBaseURL: await Settings.get("primaryBaseURL"),
            serverTimezone: await this.getTimezone(),
            serverTimezoneOffset: this.getTimezoneOffset(),
        });
    }

    /**
     * Get the IP of the client connected to the socket
     * @param {Socket} socket Socket to query
     * @returns IP of client
     */
    async getClientIP(socket : Socket) : Promise<string> {
        let clientIP = socket.client.conn.remoteAddress;

        if (clientIP === undefined) {
            clientIP = "";
        }

        if (await Settings.get("trustProxy")) {
            const forwardedFor = socket.client.conn.request.headers["x-forwarded-for"];

            if (typeof forwardedFor === "string") {
                return forwardedFor.split(",")[0].trim();
            } else if (typeof socket.client.conn.request.headers["x-real-ip"] === "string") {
                return socket.client.conn.request.headers["x-real-ip"];
            }
        }
        return clientIP.replace(/^::ffff:/, "");
    }

    /**
     * Attempt to get the current server timezone
     * If this fails, fall back to environment variables and then make a
     * guess.
     * @returns {Promise<string>} Current timezone
     */
    async getTimezone() {
        // From process.env.TZ
        try {
            if (process.env.TZ) {
                this.checkTimezone(process.env.TZ);
                return process.env.TZ;
            }
        } catch (e) {
            log.warn("timezone", e.message + " in process.env.TZ");
        }

        const timezone = await Settings.get("serverTimezone");

        // From Settings
        try {
            log.debug("timezone", "Using timezone from settings: " + timezone);
            if (timezone) {
                this.checkTimezone(timezone);
                return timezone;
            }
        } catch (e) {
            log.warn("timezone", e.message + " in settings");
        }

        // Guess
        try {
            const guess = dayjs.tz.guess();
            log.debug("timezone", "Guessing timezone: " + guess);
            if (guess) {
                this.checkTimezone(guess);
                return guess;
            } else {
                return "UTC";
            }
        } catch (e) {
            // Guess failed, fall back to UTC
            log.debug("timezone", "Guessed an invalid timezone. Use UTC as fallback");
            return "UTC";
        }
    }

    /**
     * Get the current offset
     * @returns {string} Time offset
     */
    getTimezoneOffset() {
        return dayjs().format("Z");
    }

    /**
     * Throw an error if the timezone is invalid
     * @param {string} timezone Timezone to test
     * @returns {void}
     * @throws The timezone is invalid
     */
    checkTimezone(timezone : string) {
        try {
            dayjs.utc("2013-11-18 11:55").tz(timezone).format();
        } catch (e) {
            throw new Error("Invalid timezone:" + timezone);
        }
    }

    /**
     * Initialize the data directory
     */
    initDataDir() {
        // Check if a directory
        if (!fs.lstatSync(this.config.dataDir).isDirectory()) {
            throw new Error(`Fatal error: ${this.config.dataDir} is not a directory`);
        }

        if (! fs.existsSync(this.config.dataDir)) {
            fs.mkdirSync(this.config.dataDir, { recursive: true });
        }
        log.info("server", `Data Dir: ${this.config.dataDir}`);
    }

    /**
     * Init or reset JWT secret
     * @returns  JWT secret
     */
    async initJWTSecret() : Promise<Bean> {
        let jwtSecretBean = await R.findOne("setting", " `key` = ? ", [
            "jwtSecret",
        ]);

        if (!jwtSecretBean) {
            jwtSecretBean = R.dispense("setting");
            jwtSecretBean.key = "jwtSecret";
        }

        jwtSecretBean.value = generatePasswordHash(genSecret());
        await R.store(jwtSecretBean);
        return jwtSecretBean;
    }
}