const logger = require('./libs/logger.js');
const api = require('./libs/api.js');
const server = require('./libs/server.js')
const util = require('./libs/util.js');
const blinky = require('./libs/blinky.js');
const cache = require('./libs/cache.js');
const packageJSON = require('./package.json');

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

global.appName = packageJSON.name;
global.appVersion = packageJSON.version;
global.config = process.argv[2] || __dirname + '/config.json';

handleExit();

util.fileExists(config)
    .then((result) => {
        global.config = require(result.path);
        global.config.path = result.path;
    })
    .then(logger.initialize)
    .then(blinky.initialize)
    .then(() => {
        logger.info("launching " + packageJSON.name + " " + packageJSON.version);
    })
    .then(cache.fill)
    .then(api.setupEndpoints)
    .then(server.start)
    .catch((err) => {
        exit(err);
    });

function handleExit() {
    for (var index = 0; index < INTERRUPTS.length; index++) {
        process.on(INTERRUPTS[index], async (code) => {
            exit(undefined, code);
        });
    }
}

async function exit(err, code) {
    await blinky.poweroff();
    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);
}