/* eslint-disable no-underscore-dangle */

import path from 'path';
import express, { NextFunction, Request, Response } from 'express';
import cookieParser from 'cookie-parser';
import bodyParser from 'body-parser';
import expressJwt, { UnauthorizedError as Jwt401Error } from 'express-jwt';
import jwt from 'jsonwebtoken';
import React from 'react';
import ReactDOM from 'react-dom/server';
import PrettyError from 'pretty-error';
import { ApolloServer, makeExecutableSchema } from 'apollo-server-express';
import { getDataFromTree } from 'react-apollo';
import createApolloClient from '@config@/createApolloClient.server';
import App from '@config@/App';
import Html from '@config@/Html';
import { ErrorPageWithoutStyle } from '@config@/error-page/ErrorPage';
import errorPageStyle from '@config@/error-page/ErrorPage.css';
import passport from '@config@/passport';
import config from '@config@/config';
import createCache from '@config@/createCache';
import router from './router';
// import models from './data/models';
import schema from './schema';
// import assets from './asset-manifest.json'; // eslint-disable-line import/no-unresolved
// @ts-ignore
import chunks from './chunk-manifest.json'; // eslint-disable-line import/no-unresolved
import { AppContextTypes } from './AppContext';
import {
  clientDefaults,
  clientResolvers,
  clientTypeDefs,
} from './clientSchema';
import serverRootValueDeps from '../../__generated__/serverRootValueDeps';

const serverRootValue = serverRootValueDeps[0]
  ? serverRootValueDeps[0][0].default
  : {};

process.on('unhandledRejection', (reason, p) => {
  console.error('Unhandled Rejection at:', p, 'reason:', reason);
  // send entire app down. Process manager will restart it
  process.exit(1);
});

//
// Tell any CSS tooling (such as Material UI) to use all vendor prefixes if the
// user agent is not known.
// -----------------------------------------------------------------------------
// @ts-ignore
global.navigator = global.navigator || {};
// @ts-ignore
global.navigator.userAgent = global.navigator.userAgent || 'all';

const app = express();

//
// If you are using proxy from external machine, you can set TRUST_PROXY env
// Default is to trust proxy headers only from loopback interface.
// -----------------------------------------------------------------------------
app.set('trust proxy', config.trustProxy);

//
// Register Node.js middleware
// -----------------------------------------------------------------------------
// @ts-ignore
app.use(express.static(path.resolve(__userDir__, 'public')));
app.use(cookieParser());
app.use(bodyParser.urlencoded({ extended: true }));
app.use(bodyParser.json());

//
// Authentication
// -----------------------------------------------------------------------------
app.use(
  expressJwt({
    secret: config.auth.jwt.secret,
    credentialsRequired: false,
    getToken: req => req.cookies.id_token,
  }),
);
// Error handler for express-jwt
app.use((err: any, req: Request, res: Response, next: NextFunction) => {
  // eslint-disable-line no-unused-vars
  if (err instanceof Jwt401Error) {
    console.error('[express-jwt-error]', req.cookies.id_token);
    // `clearCookie`, otherwise user can't use web-app until cookie expires
    res.clearCookie('id_token');
  }
  next(err);
});

app.use(passport.initialize());

app.get(
  '/login/facebook',
  passport.authenticate('facebook', {
    scope: ['email', 'user_location'],
    session: false,
  }),
);
app.get(
  '/login/facebook/return',
  passport.authenticate('facebook', {
    failureRedirect: '/login',
    session: false,
  }),
  (req, res) => {
    const expiresIn = 60 * 60 * 24 * 180; // 180 days
    const token = jwt.sign(req.user, config.auth.jwt.secret, { expiresIn });
    res.cookie('id_token', token, { maxAge: 1000 * expiresIn, httpOnly: true });
    res.redirect('/');
  },
);

//
// Register API middleware
// -----------------------------------------------------------------------------
// https://github.com/graphql/express-graphql#options

const server = new ApolloServer({
  schema: makeExecutableSchema(schema),
  uploads: false,
  introspection: __DEV__,
  playground: __DEV__,
  debug: __DEV__,
  context: ({ req }: { req: Request }) => ({ req }),
  rootValue: serverRootValue,
});
server.applyMiddleware({ app });

//
// Register server-side rendering middleware
// -----------------------------------------------------------------------------
app.get('*', async (req, res, next) => {
  try {
    const css = new Set();

    // Enables critical path CSS rendering
    // https://github.com/kriasoft/isomorphic-style-loader
    const insertCss = (...styles: any[]) => {
      styles.forEach(style => css.add(style._getCss()));
    };

    const apolloClient = createApolloClient({
      schemaArgs: {
        schema: makeExecutableSchema(schema),
        // This is a context consumed in GraphQL Resolvers
        context: { req },
      },
      partialCacheDefaults: {
        user: req.user || null,
      },
      apolloCache: createCache(),
      clientDefaults,
      clientResolvers,
      clientTypeDefs,
    });

    // Global (context) variables that can be easily accessed from any React component
    // https://facebook.github.io/react/docs/context.html
    const context: AppContextTypes = {
      // The twins below are wild, be careful!
      pathname: req.path,
      query: req.query,
    };

    const route = await router.resolve(context);

    context.params = route.params;

    if (route.redirect) {
      res.redirect(route.status || 302, route.redirect);
      return;
    }

    const data = { ...route };
    const rootComponent = (
      <App context={context} client={apolloClient} insertCss={insertCss}>
        {route.component}
      </App>
    );
    await getDataFromTree(rootComponent);
    data.children = await ReactDOM.renderToString(rootComponent);
    data.styles = [{ id: 'css', cssText: [...css].join('') }];

    const scripts = new Set();
    const addChunk = (chunk: string) => {
      if (chunks[chunk]) {
        chunks[chunk].forEach((asset: any) => scripts.add(asset));
      } else if (__DEV__) {
        throw new Error(`Chunk with name '${chunk}' cannot be found`);
      }
    };
    addChunk('client');
    if (route.chunk) addChunk(route.chunk);
    if (route.chunks) route.chunks.forEach(addChunk);

    data.scripts = Array.from(scripts);
    data.app = {
      apiUrl: config.api.clientUrl,

      // To restore apollo cache in client.js
      cache: apolloClient.extract(),
    };

    const html = ReactDOM.renderToStaticMarkup(<Html {...data} />);
    res.status(route.status || 200);
    res.send(`<!doctype html>${html}`);
  } catch (err) {
    next(err);
  }
});

//
// Error handling
// -----------------------------------------------------------------------------
const pe = new PrettyError();
pe.skipNodeFiles();
pe.skipPackage('express');

// eslint-disable-next-line no-unused-vars
app.use((err: any, req: Request, res: Response, _next: NextFunction) => {
  console.error(pe.render(err));
  const html = ReactDOM.renderToStaticMarkup(
    <Html
      app={{}}
      title="Internal Server Error"
      description={err.message}
      styles={[{ id: 'css', cssText: errorPageStyle._getCss() }]}
    >
      {ReactDOM.renderToString(<ErrorPageWithoutStyle error={err} />)}
    </Html>,
  );
  res.status(err.status || 500);
  res.send(`<!doctype html>${html}`);
});

//
// Launch the server
// -----------------------------------------------------------------------------
// const promise = models.sync().catch((err: Error) => console.error(err.stack));
if (!module.hot) {
  // promise.then(() => {
  app.listen(config.port, () => {
    console.info(`The server is running at http://localhost:${config.port}/`);
  });
  // });
}

//
// Hot Module Replacement
// -----------------------------------------------------------------------------
if (module.hot) {
  module.hot.accept('./router');
}

export const { hot } = module;
export default app;