'use strict';

// Core.
const fs = require('fs');
// 3rd-party.
const yaml = require('js-yaml');

exports.emitComposeFile = function(services) {
  return emitString(emitObject(services));
};

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

function emitObject(services) {
  const composeFile = {
    version: '3',
    services: {},
  };
  const cwd = process.cwd();
  for (const service of services) {
    composeFile.services[service] = emitService(service);
    const modulePath = `${cwd}/services/${service}/compose`;
    try {
      require(modulePath)(composeFile.services[service], composeFile);
    }
    catch (error) {
      if (`Cannot find module '${modulePath}'` !== error.message) {
        console.error(error);
        process.exit(1);
      }
    }
  }
  return composeFile;
}

function emitService(service) {
  const definition = {};
  if ('production' === process.env.NODE_ENV) {
    definition.image = 'docker.i12e.cha0s.io/cha0s6983/truss-production';
  }
  else {
    definition.image = 'docker.i12e.cha0s.io/cha0s6983/truss-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 = [
      `./${service}:/var/node/dist`,
    ];
  }
  else {
    definition.volumes = [
      `./services/${service}:/var/node/src`,
      `./dist/dev/${service}:/var/node/dist`,
    ];
    // Add individual lib entries.
    const cwd = process.cwd();
    const entries = fs.readdirSync(`${cwd}/lib`);
    for (const entry of entries) {
      definition.volumes.push(`./lib/${entry}:/var/node/lib/${entry}`);
    }
  }
  return definition;
}