'use strict';

// Dependencies.
const glob = require('glob');
const { setWith, merge, get, isObject, isFunction } = require('lodash');

const optionalPath = path => {
  return path
    .replace(/(\.settings|.json|.js)/g, '')
    .split('/')
    .slice(1, path.split('/').length - 1)
    .join('.')
    .toLowerCase();
};

const aggregatePath = path => {
  return path
    .replace(/(\.settings|.json|.js)/g, '')
    .split('/')
    .slice(1)
    .join('.')
    .toLowerCase();
};

const setConfig = function (ctx, path, type, loader) {
  const objPath = type === 'optional' ?
    optionalPath(path) :
    aggregatePath(path);

  // Load value.
  const value = loader(path);
  // Merge doesn't work for none-object value and function.
  const obj = isObject(value) && !isFunction(value) ? merge(get(ctx, objPath), value) : value;

  // Assignation.
  return setWith(ctx, objPath, obj, Object);
};

module.exports = function() {
  return Promise.all([

    new Promise((resolve, reject) => {
      // Load configurations.
      glob('./modules/*/!(config)/*.*(js|json)', {
        cwd: this.config.appPath
      }, (err, files) => {
        if (err) {
          return reject(err);
        }

        files.map(p => setConfig(this, p, 'aggregate', this.loadFile));

        resolve();
      });
    }),

  ]);
};