var _ = require('lodash');

/**
 * @dgService getDocFromAlias
 * @description Get an array of docs that match this alias, relative to the originating doc.
 */
module.exports = function getDocFromAlias(aliasMap) {

  return function getDocFromAlias(alias, originatingDoc) {
    var docs = aliasMap.getDocs(alias);

    // If there is more than one item with this name then try to filter them by the originatingDoc's
    // area
    if (docs.length > 1 && originatingDoc && originatingDoc.area) {
      docs = _.filter(docs, function(doc) { return doc.area === originatingDoc.area; });
    }

    // If filtering by area left us with none then let's start again
    if (docs.length === 0) {
      docs = aliasMap.getDocs(alias);
    }

    // If there is more than one item with this name then try to filter them by the originatingDoc's
    // module
    if (docs.length > 1 && originatingDoc && originatingDoc.module) {
      docs = _.filter(docs, function(doc) { return doc.module === originatingDoc.module; });
    }

    return docs;
  };
};