/**
   * @fileoverview Environments manager
   * @author Nicholas C. Zakas
   */
  "use strict";
  
  //------------------------------------------------------------------------------
  // Requirements
  //------------------------------------------------------------------------------
  
  const envs = require("../../conf/environments");
  
  //------------------------------------------------------------------------------
  // Private
  //------------------------------------------------------------------------------
  
  let environments = new Map();
  
  /**
   * Loads the default environments.
   * @returns {void}
   * @private
   */
  function load() {
      Object.keys(envs).forEach(envName => {
          environments.set(envName, envs[envName]);
      });
  }
  
  // always load default environments upfront
  load();
  
  //------------------------------------------------------------------------------
  // Public Interface
  //------------------------------------------------------------------------------
  
  module.exports = {
  
      load,
  
      /**
       * Gets the environment with the given name.
       * @param {string} name The name of the environment to retrieve.
       * @returns {Object?} The environment object or null if not found.
       */
      get(name) {
          return environments.get(name) || null;
      },
  
      /**
       * Defines an environment.
       * @param {string} name The name of the environment.
       * @param {Object} env The environment settings.
       * @returns {void}
       */
      define(name, env) {
          environments.set(name, env);
      },
  
      /**
       * Imports all environments from a plugin.
       * @param {Object} plugin The plugin object.
       * @param {string} pluginName The name of the plugin.
       * @returns {void}
       */
      importPlugin(plugin, pluginName) {
          if (plugin.environments) {
              Object.keys(plugin.environments).forEach(envName => {
                  this.define(`${pluginName}/${envName}`, plugin.environments[envName]);
              });
          }
      },
  
      /**
       * Resets all environments. Only use for tests!
       * @returns {void}
       */
      testReset() {
          environments = new Map();
          load();
      }
  };