#!/usr/bin/env node

'use strict';

const constants = require('./src/constants.js'),
    fs = require('node:fs'),
    ldapServer = require('./src/ldapserver.js'),
    net = require('node:net'),
    oidcServer = require('./src/oidcserver.js'),
    paths = require('./src/paths.js'),
    proxyAuth = require('./src/proxyauth.js'),
    safe = require('safetydance'),
    server = require('./src/server.js'),
    directoryServer = require('./src/directoryserver.js');

let logFd;

async function setupLogging() {
    if (constants.TEST) return;

    logFd = fs.openSync(paths.BOX_LOG_FILE, 'a');
    // we used to write using a stream before but it caches internally and there is no way to flush it when things crash
    process.stdout.write = process.stderr.write = function (...args) {
        const callback = typeof args[args.length-1] === 'function' ? args.pop() : function () {}; // callback is required for fs.write
        fs.write.apply(fs, [logFd, ...args, callback]);
    };
}

// happy eyeballs workaround. when there is no ipv6, nodejs timesout prematurely since the default for ipv4 is just 250ms
// https://github.com/nodejs/node/issues/54359
async function setupNetworking() {
    net.setDefaultAutoSelectFamilyAttemptTimeout(2500);
}

// this is also used as the 'uncaughtException' handler which can only have synchronous functions
function exitSync(status) {
    const ts = new Date().toISOString();
    if (status.message) fs.write(logFd, `${ts} ${status.message}\n`, function () {});
    const msg = status.error.stack.replace(/\n/g, `\n${ts} `); // prefix each line with ts
    if (status.error) fs.write(logFd, `${ts} ${msg}\n`, function () {});
    fs.fsyncSync(logFd);
    fs.closeSync(logFd);
    process.exit(status.code);
}

async function startServers() {
    await setupLogging();
    await setupNetworking();
    await server.start(); // do this first since it also inits the database
    await proxyAuth.start();
    await ldapServer.start();

    const conf = await directoryServer.getConfig();
    if (conf.enabled) await directoryServer.start();
}

async function main() {
    const [error] = await safe(startServers());
    if (error) return exitSync({ error, code: 1, message: 'Error starting servers' });

    // require this here so that logging handler is already setup
    const debug = require('debug')('box:box');

    process.on('SIGHUP', async function () {
        debug('Received SIGHUP. Re-reading configs.');
        const conf = await directoryServer.getConfig();
        if (conf.enabled) await directoryServer.checkCertificate();
    });

    process.on('SIGINT', async function () {
        debug('Received SIGINT. Shutting down.');

        await proxyAuth.stop();
        await server.stop();
        await directoryServer.stop();
        await ldapServer.stop();
        await oidcServer.stop();

        setTimeout(() => {
            debug('Shutdown complete');
            process.exit();
        }, 2000); // need to wait for the task processes to die
    });

    process.on('SIGTERM', async function () {
        debug('Received SIGTERM. Shutting down.');

        await proxyAuth.stop();
        await server.stop();
        await directoryServer.stop();
        await ldapServer.stop();
        await oidcServer.stop();

        setTimeout(() => {
            debug('Shutdown complete');
            process.exit();
        }, 2000); // need to wait for the task processes to die
    });

    process.on('uncaughtException', (error) => exitSync({ error, code: 1, message: 'From uncaughtException handler.' }));
}

main();