const logger = require('./libs/logger.js');
const util = require('./libs/util.js');
const cli = require('./libs/cli.js');
const server = require('./libs/server.js');
const packageJSON = require('./package');

const INTERRUPTS = ['SIGINT', 'SIGTERM'];

global.config = undefined;
global.appName = packageJSON.name;
global.appVersion = packageJSON.version;

// handle interrupts
handleInterrupts();

// start the application
main()
    .catch(exit);

async function main() {
    await setGlobalConfig();
    logger.initialize();
    logger.info(global.appName + ' ' + global.appVersion + ' starting...');
    if (await cli.handleArguments()) {
        exit();
    }
    logger.info(await server.start());
    server.handleRequests();
}

async function setGlobalConfig() {
    let config = __dirname + '/config.json';
    let index = process.argv.indexOf(cli.ARG_CONFIG);
    if (index >= 0 && process.argv.length >= index + 1) {
        config = process.argv[index + 1];
    }
    config = await util.fileExists(config);
    global.config = require(config.path);
    global.config.path = config.path;
}

function handleInterrupts() {
    for (let index = 0; index < INTERRUPTS.length; index++) {
        process.once(INTERRUPTS[index], (code) => {
            exit(null, code);
        });
    }
}

function exit(err, code) {
    if (code === undefined) {
        code = 0;
        if (err !== undefined) {
            code = 1;
        }
    }
    if (err) {
        logger.error(err);
        logger.error(global.appName + ' ' + global.appVersion + ' ended due to an error');
    } else {
        logger.info(global.appName + ' ' + global.appVersion + ' shutting down gracefully')
    }
    process.exit(code);
}