var RecursiveIterator = require('recursive-iterator');
var System = require('./system');
var Logger = require('./logger');
var _ = require('lodash');
var path = require('path');

// Load a profile file with imports
exports.load = function(profileUrl, withImports) {

  withImports = withImports || true;

  // Load root profile
  return System.loadJSON(profileUrl)
    .then(function(profile) {

      if(!withImports) {
        return profile;
      }

      var promises = [];

      // Search for imports
      var iterator = new RecursiveIterator(profile);

      for(var node, item = iterator.next(); !item.done; item = iterator.next()) {
        node = item.value.node;
        // For each import found, load the partial and "mount" it on the current item
        if(node.import) {
          var importPath = path.resolve(path.dirname(profileUrl), node.import)
          Logger.info('Loading import "%s"', importPath);
          p = exports.load(importPath)
            .then(_mountImport.bind(node))
          ;
          promises.push(p);
        }
      }

      // When all imports are loaded, return the complete profile
      return Promise.all(promises)
        .then(function() {
          return profile;
        })
      ;

    })
  ;

  // Internal method, extend "this" (the mount point) with the partial profile
  function _mountImport(importProfile) {
    _.extend(this, importProfile);
  }

};