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

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

global.config = process.argv[2] || __dirname + '/config.json';

// handle interrupts
handleInterrupts();

// start the application
main();

// main - let's get this party started
function main() {
    util.fileExists(global.config)
        .then((result) => {
            global.config = require(result.path);
            global.config.path = result.path;
        })
        .then(logger.initialize)
        .then(server.start)
        .then(logger.info)
        .then(server.handleRequests)
        .catch(exit);
}

// ... and it all comes crashing down
function exit(err, code) {
    if (code === undefined) {
        code = 0;
        if (err !== undefined) {
            code = 1;
        }
    }
    if (err) {
        logger.error(err);
        logger.error(packageJSON.name + " ended due to an error");
    } else {
        logger.info(packageJSON.name + " shutting down gracefully")
    }
    process.exit(code);
}

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