/*
	Spacebar: A FOSS re-implementation and extension of the Discord.com backend.
	Copyright (C) 2023 Spacebar and Spacebar Contributors
	
	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU Affero General Public License as published
	by the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.
	
	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU Affero General Public License for more details.
	
	You should have received a copy of the GNU Affero General Public License
	along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

process.on("unhandledRejection", console.error);
process.on("uncaughtException", console.error);

import moduleAlias from "module-alias";
moduleAlias(__dirname + "../../../package.json");

import { config } from "dotenv";
config({ quiet: true });

import cluster, { Worker } from "node:cluster";
import os from "node:os";
import "reflect-metadata";
import { red, bold, yellow, cyan, blueBright, redBright } from "picocolors";
import { centerString } from "@spacebar/extensions";
import { getRevInfoOrFail, Logo } from "@spacebar/util";
import { initStats } from "./stats";

const cores = process.env.THREADS ? parseInt(process.env.THREADS) : 1;

if (cluster.isPrimary) {
    const revInfo = getRevInfoOrFail();
    Logo.printLogo().then(() => {
        const unformatted = `spacebar-server | !! Pre-release build !!`;
        const formatted = `${blueBright("spacebar-server")} | ${redBright("⚠️ Pre-release build ⚠️")}`;
        console.log(bold(centerString(unformatted, 86).replace(unformatted, formatted)));

        const shortRev = revInfo.rev ? revInfo.rev.slice(0, 7) : "unknown";
        const unformattedRevisionHeader = `Commit Hash: ${revInfo.rev !== null ? `${revInfo.rev} (${shortRev})` : "Unknown"}`;
        const formattedRevisionHeader = `Commit Hash: ${revInfo.rev !== null ? `${cyan(revInfo.rev)} (${yellow(shortRev)})` : "Unknown"}`;
        console.log(bold(centerString(unformattedRevisionHeader, 86).replace(unformattedRevisionHeader, formattedRevisionHeader)));

        const modifiedTime = new Date(revInfo.lastModified * 1000);
        const unformattedLastModified = `Last Updated: ${revInfo.lastModified !== 0 ? `${modifiedTime.toUTCString()}` : "Unknown"}`;
        const formattedLastModified = `Last Updated: ${revInfo.lastModified !== 0 ? `${cyan(modifiedTime.toUTCString())}` : "Unknown"}`;
        console.log(bold(centerString(unformattedLastModified, 86).replace(unformattedLastModified, formattedLastModified)));

        if (revInfo.rev == null) {
            console.log(yellow(`Warning: Git is not installed or not in PATH, or the server is not running from a Git repository.`));
        }

        console.log(`Cores: ${cyan(os.cpus().length)} (Using ${cores} thread(s).)`);
        initStats();

        console.log(`[Process] Starting with ${cores} threads`);

        if (cores === 1) {
            require("./Server");
        } else {
            process.env.EVENT_TRANSMISSION = "process";

            // Fork workers.
            for (let i = 0; i < cores; i++) {
                cluster.fork();
                console.log(`[Process] Worker ${cyan(i)} started.`);
            }

            cluster.on("message", (sender: Worker, message) => {
                for (const id in cluster.workers) {
                    const worker = cluster.workers[id];
                    if (worker === sender || !worker) continue;
                    worker.send(message);
                }
            });

            cluster.on("exit", (worker) => {
                console.log(`[Worker] ${red(`PID ${worker.process.pid} died, restarting ...`)}`);
                cluster.fork();
            });
        }
    });
} else {
    require("./Server");
}