import nconf from 'nconf';
import fs from 'fs';
import { langCodes } from '../../libs/i18n';
import { CONTENT_CACHE_PATH, getLocalizedContentResponse } from '../../libs/content';

const IS_PROD = nconf.get('IS_PROD');

const api = {};

const CACHED_HASHES = [

];

const MOBILE_FILTER = `achievements,questSeriesAchievements,animalColorAchievements,animalSetAchievements,stableAchievements,
mystery,bundles,loginIncentives,pets,premiumPets,specialPets,questPets,wackyPets,mounts,premiumMounts,specialMounts,questMounts,
events,dropEggs,questEggs,dropHatchingPotions,premiumHatchingPotions,wackyHatchingPotions,backgroundsFlat,questsByLevel,gear.tree,
tasksByCategory,userDefaults,timeTravelStable,gearTypes,cardTypes`;

function hashForFilter (filter) {
  let hash = 0;
  let i; let
    chr;
  if (filter.length === 0) return '';
  for (i = 0; i < filter.length; i++) { // eslint-disable-line
    chr = filter.charCodeAt(i);
    hash = ((hash << 5) - hash) + chr; // eslint-disable-line
    hash |= 0; // eslint-disable-line
  }
  return String(hash);
}

/**
 * @api {get} /api/v3/content Get all available content objects
 * @apiDescription Does not require authentication.
 * @apiName ContentGet
 * @apiGroup Content
 *
 * @apiParam (Query) {String="bg","cs","da","de",
 *                   "en","en@pirate","en_GB",
 *                    "es","es_419","fr","he","hu",
 *                    "id","it","ja","nl","pl","pt","pt_BR",
 *                    "ro","ru","sk","sr","sv",
 *                    "uk","zh","zh_TW"} [language=en] Language code used for the items'
 *                                                     strings. If the authenticated user makes
 *                                                     the request, the content will return with
 *                                                     the user's configured language.
 *
 * @apiSuccess {Object} data Various data about the content of Habitica. The content route
 * contains many keys, but the data listed below are the recommended data to use.
 * @apiSuccess {Object} data.mystery The mystery sets awarded to paying subscribers.
 * @apiSuccess {Object} data.gear The gear that can be equipped.
 * @apiSuccess {Object} data.gear.tree Detailed information about the gear, organized by type.
 * @apiSuccess {Object} data.gear.flat The full key of each equipment.
 * @apiSuccess {Object} data.spells The skills organized by class. Includes cards and visual buffs.
 * @apiSuccess {Object} data.potion Data about the health potion.
 * @apiSuccess {Object} data.armoire Data about the armoire.
 * @apiSuccess {Array} data.classes The available classes.
 * @apiSuccess {Object} data.eggs All available eggs.
 * @apiSuccess {Object} data.timeTravelStable The animals available
 *                                            in the Time Traveler's stable, separated
 *                                            into pets and mounts.
 * @apiSuccess {Object} data.hatchingPotions All the hatching potions.
 * @apiSuccess {Object} data.petInfo All the pets with extra info.
 * @apiSuccess {Object} data.mountInfo All the mounts with extra info.
 * @apiSuccess {Object} data.food All the food.
 * @apiSuccess {Array} data.userCanOwnQuestCategories The types of quests that a user can own.
 * @apiSuccess {Object} data.quests Data about the quests.
 * @apiSuccess {Object} data.appearances Data about the appearance properties.
 * @apiSuccess {Object} data.appearances.hair Data about available hair options.
 * @apiSuccess {Object} data.appearances.shirt Data about available shirt options.
 * @apiSuccess {Object} data.appearances.size Data about available body size options.
 * @apiSuccess {Object} data.appearances.skin Data about available skin options.
 * @apiSuccess {Object} data.appearances.chair Data about available chair options.
 * @apiSuccess {Object} data.appearances.background Data about available background options.
 * @apiSuccess {Object} data.backgrounds Data about the background sets.
 * @apiSuccess {Object} data.subscriptionBlocks Data about the various subscriptions blocks.
 *
 */
api.getContent = {
  method: 'GET',
  url: '/content',
  noLanguage: true,
  async handler (req, res) {
    let language = 'en';
    const proposedLang = req.query.language;

    if (proposedLang && langCodes.includes(proposedLang)) {
      language = proposedLang;
    }

    let filter = req.query.filter || '';
    // apply defaults for mobile clients
    if (filter === '') {
      if (req.headers['x-client'] === 'habitica-android') {
        filter = `${MOBILE_FILTER},appearance.background`;
      } else if (req.headers['x-client'] === 'habitica-ios') {
        filter = `${MOBILE_FILTER},backgrounds`;
      }
    }

    // Build usable filter object
    const filterObj = {};
    filter.split(',').forEach(item => {
      if (item.includes('.')) {
        const [key, subkey] = item.split('.');
        if (!filterObj[key]) {
          filterObj[key] = {};
        }
        filterObj[key][subkey.trim()] = true;
      } else {
        filterObj[item.trim()] = true;
      }
    });

    if (IS_PROD) {
      const filterHash = language + hashForFilter(filter);
      if (CACHED_HASHES.includes(filterHash)) {
        // Content is already cached, so just send it.
        res.sendFile(`${CONTENT_CACHE_PATH}${filterHash}.json`);
      } else {
        // Content is not cached, so cache it and send it.
        res.set({
          'Content-Type': 'application/json',
        });
        const jsonResString = getLocalizedContentResponse(language, filterObj);
        fs.writeFileSync(
          `${CONTENT_CACHE_PATH}${filterHash}.json`,
          jsonResString,
          'utf8',
        );
        CACHED_HASHES.push(filterHash);
        res.status(200).send(jsonResString);
      }
    } else {
      res.set({
        'Content-Type': 'application/json',
      });
      const jsonResString = getLocalizedContentResponse(language, filterObj);
      res.status(200).send(jsonResString);
    }
  },
};

export default api;