/* eslint-disable no-return-await */
/* eslint-disable camelcase */
const { readdirSync, readFileSync } = require('fs');
const { join } = require('path');
const crypto = require('crypto');
const { tmpdir } = require('os');
const { ObjectID } = require('mongodb');
const bus = require('hydrooj/dist/service/bus');
const { PERM } = require('hydrooj/dist/model/builtin');
const markdown = require('./backendlib/markdown');

const {
  system, domain, user, setting, problem, contest,
} = global.Hydro.model;
const { Route, Handler, UiContextBase } = global.Hydro.service.server;

class WikiHelpHandler extends Handler {
  constructor(args) {
    super(args);
    this.noCheckPermView = true;
  }

  async get({ domainId }) {
    const LANGS = setting.langs;
    const languages = {};
    // eslint-disable-next-line guard-for-in
    for (const key in LANGS) {
      if (LANGS[key].domain && !LANGS[key].domain.includes(domainId)) continue;
      languages[`${LANGS[key].display}(${key})`] = LANGS[key].compile || LANGS[key].execute;
    }
    this.response.body = { languages };
    this.response.template = 'wiki_help.html';
  }
}

class WikiAboutHandler extends Handler {
  constructor(args) {
    super(args);
    this.noCheckPermView = true;
  }

  async get() {
    this.response.template = 'about.html';
  }
}

class UiConstantsHandler extends Handler {
  constructor(args) {
    super(args);
    this.noCheckPermView = true;
  }

  async get() {
    this.response.body = `window.LANGS=${JSON.stringify(setting.langs)}`;
    this.response.type = 'text/javascript';
    this.ctx.set('nolog', '1');
  }
}

class UiSettingsHandler extends Handler {
  constructor(args) {
    super(args);
    this.noCheckPermView = true;
  }

  async get({ domainId }) {
    const [nav_logo_dark, nav_logo_dark_2x] = system.getMany([
      'ui-default.nav_logo_dark', 'ui-default.nav_logo_dark_2x',
    ]);
    const ddoc = await domain.get(domainId);
    this.response.body = await this.renderHTML('extra.css', {
      nav_logo_dark,
      nav_logo_dark_2x,
      ...ddoc,
    });
    this.response.type = 'text/css';
    this.ctx.set('nolog', '1');
  }
}

class LocaleHandler extends Handler {
  constructor(args) {
    super(args);
    this.noCheckPermView = true;
  }

  async get({ id }) {
    // eslint-disable-next-line prefer-destructuring
    id = id.split('.')[0];
    // TODO use language_default setting
    if (!global.Hydro.locales[id]) id = system.get('server.language');
    this.response.body = `window.LOCALES=${JSON.stringify(global.Hydro.locales[id])}`;
    this.response.type = 'text/javascript';
    this.ctx.set('nolog', '1');
  }
}

class SetThemeHandler extends Handler {
  constructor(args) {
    super(args);
    this.noCheckPermView = true;
  }

  async get({ theme }) {
    await user.setById(this.user._id, { theme });
    this.back();
  }
}

class MarkdownHandler extends Handler {
  constructor(args) {
    super(args);
    this.noCheckPermView = true;
  }

  async post({ text, html = false, inline = false }) {
    this.response.body = inline
      ? markdown.renderInline(text, html)
      : markdown.render(text, html);
    this.response.type = 'text/html';
    this.response.status = 200;
  }
}

class RichMediaHandler extends Handler {
  async renderUser(domainId, payload) {
    let d = payload.domainId || domainId;
    const cur = payload.domainId ? await user.getById(payload.domainId, this.user._id) : this.user;
    if (!cur.hasPerm(PERM.PERM_VIEW)) d = domainId;
    const udoc = Number.isNaN(+payload.id) ? await user.getByUname(d, payload.id) : await user.getById(d, +payload.id);
    return await this.renderHTML('partials/user.html', { udoc });
  }

  async renderProblem(domainId, payload) {
    const cur = payload.domainId ? await user.getById(payload.domainId, this.user._id) : this.user;
    let pdoc = cur.hasPerm(PERM.PERM_VIEW | PERM.PERM_VIEW_PROBLEM)
      ? await problem.get(payload.domainId || domainId, payload.id) || problem.default
      : problem.default;
    if (pdoc.hidden && !cur.own(pdoc) && !cur.hasPerm(PERM.PERM_VIEW_PROBLEM_HIDDEN)) pdoc = problem.default;
    return await this.renderHTML('partials/problem.html', { pdoc });
  }

  async renderContest(domainId, payload) {
    const cur = payload.domainId ? await user.getById(payload.domainId, this.user._id) : this.user;
    const tdoc = cur.hasPerm(PERM.PERM_VIEW | PERM.PERM_VIEW_CONTEST)
      ? await contest.get(payload.domainId || domainId, new ObjectID(payload.id))
      : null;
    if (tdoc) return await this.renderHTML('partials/contest.html', { tdoc });
    return '';
  }

  async post({ domainId, items }) {
    const res = [];
    for (const item of items) {
      if (item.domainId && item.domainId === domainId) delete item.domainId;
      if (item.type === 'user') res.push(this.renderUser(domainId, item).catch(() => ''));
      else if (item.type === 'problem') res.push(this.renderProblem(domainId, item).catch(() => ''));
      else if (item.type === 'contest') res.push(this.renderContest(domainId, item).catch(() => ''));
      else res.push('');
    }
    this.response.body = await Promise.all(res);
  }
}

const getHash = (i) => {
  const shasum = crypto.createHash('sha1');
  const file = readFileSync(join(tmpdir(), 'hydro', 'public', i));
  shasum.update(file);
  return shasum.digest('hex').substr(0, 10);
};

const getUrl = (files) => files.map((i) => `/${i}?${getHash(i)}`);

bus.on('app/started', () => {
  const files = readdirSync(join(tmpdir(), 'hydro', 'public'));
  const pages = files.filter((file) => file.endsWith('.page.js'));
  const themes = files.filter((file) => file.endsWith('.theme.js'));
  UiContextBase.extraPages = getUrl(pages);
  UiContextBase.themes = {};
  for (const theme of themes) {
    UiContextBase.themes[theme] = `/${theme}?${getHash(theme)}`;
  }
});

global.Hydro.handler.ui = async () => {
  Route('wiki_help', '/wiki/help', WikiHelpHandler);
  Route('wiki_about', '/wiki/about', WikiAboutHandler);
  Route('ui_constants', '/ui-constants.js', UiConstantsHandler);
  Route('locale', '/locale/:id', LocaleHandler);
  Route('set_theme', '/set_theme/:id', SetThemeHandler);
  Route('ui_extracss', '/extra.css', UiSettingsHandler);
  Route('markdown', '/markdown', MarkdownHandler);
  Route('media', '/media', RichMediaHandler);
};