const yaml = require('js-yaml');

exports.emitString = function(object) {
  return yaml.safeDump(object);
}

exports.emitObject = function(services) {

  services = services.slice(0);
  if (-1 === services.indexOf('gateway')) {
    services.push('gateway');
  }

  const composeFile = {
    version: '3',
    services: {},
  };

  for (const service of services) {
    composeFile.services[service] = emitService(service);
    const modulePath = `./services/${service}/compose`;
    try {
      require(modulePath)(composeFile.services[service]);
      console.log('compose');
    }
    catch (error) {
      const message = `Cannot find module '${modulePath}'`;
      if (message !== error.message) {
        console.error(error);
        process.exit(1);
      }
    }
  }

  return composeFile;
}

function emitService(service) {
  const definition = {};

  definition.image = `docker.i12e.cha0s.io/cha0s6983/truss-${
    'production' === process.env.NODE_ENV ? 'production': 'dev'
  }`;
  if ('production' === process.env.NODE_ENV) {
    definition.env_file = [
      '.env',
    ];
  }
  else {
    definition.env_file = [
      '.common.env', `.dev.env`, '.env',
    ];
  }
  if ('production' === process.env.NODE_ENV) {
    definition.volumes = [
      `./${service}:/var/node/dist`,
    ];
  }
  else {
    definition.volumes = [
      './lib:/var/node/lib',
      `./services/${service}:/var/node/src`,
      `./dist/dev/${service}:/var/node/dist`,
    ];
  }
  return definition;
}