'use strict';
/**
 * lite-server : Simple server for angular/SPA projects
 *
 * Simply loads some default browser-sync config that apply to SPAs,
 * applies custom config overrides from user's own local `bs-config.{js|json}` file,
 * and launches browser-sync.
 */
var browserSync = require('browser-sync').create('lite-server');
var path = require('path');
var _ = require('lodash');
var config = require('./config-defaults');

module.exports = function start(opts, cb) {
  opts = opts || {};
  opts.argv = opts.argv || process.argv;
  opts.console = opts.console || console;
  cb = cb || function noop() { };

  // Load configuration
  var argv = require('minimist')(opts.argv.slice(2));
  var bsConfigName = argv.c || argv.config || 'bs-config';

  // Load optional browser-sync config file from user's project dir
  var bsConfigPath = path.resolve(bsConfigName);
  var overrides = {};
  try {
    overrides = require(bsConfigPath);
  } catch (err) {
    if (err.code && err.code === 'MODULE_NOT_FOUND') {
      logMissingConfigFile();
    } else {
      throw (err);
    }
  }

  // Set optional baseDir
  config.server.baseDir = argv.baseDir || config.server.baseDir;

  if (typeof overrides === 'function') {
    overrides = overrides(browserSync);
  }

  _.merge(config, overrides);

  // Fixes browsersync error when overriding middleware array
  if (config.server.middleware) {
    config.server.middleware = _.compact(config.server.middleware);
  }

  logConfig();

  // Run browser-sync
  browserSync.init(config, cb);

  return browserSync;

  function logEnabled() {
    return config.logLevel !== 'silent';
  }

  function logConfig() {
    if (logEnabled()) {
      opts.console.log('** browser-sync config **');
      opts.console.log(config);
    }
  }

  function logMissingConfigFile() {
    if (logEnabled()) {
      opts.console.info(
        'Did not detect a `bs-config.json` or `bs-config.js` override file.' +
        ' Using lite-server defaults...'
      );
    }
  }

};