const watchers = require('./libs/watchers.js');
const util = require('./libs/util.js');
const logger = require('./libs/logger.js');
const packageJSON = require('./package.json');

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

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

handleInterrupts();

util.fileExists(config)
    .catch((err) => {
        logger.error('given config file \'' + config + '\' does not exist');
        logger.error(err);
        exit(1);
    })
    .then((result) => {
        global.config = require(result.path);
        global.config.path = result.path;
    })
    .then(logger.initialize)
    .then(() => {
        logger.info(packageJSON.name + ' ' + packageJSON.version + ' starting...');
    })
    .then(watchers.initialize)
    .then(watchers.start)
    .catch((err) => {
        logger.error(err);
        exit(1);
    });

function exit(code) {
    code = code || 0;
    logger.info(packageJSON.name + ' ' + packageJSON.version + ' exiting with code \'' + code + '\'...');
    process.exit(code);
}

function handleInterrupts() {
    for (var index = 0; index < INTERRUPTS.length; index++) {
        process.once(INTERRUPTS[index], (code) => {
            watchers.stop()
                .then(exit(code))
                .catch(exit(code));
        });
    }
}