const express = require('express');
const bodyParser = require('body-parser');
const models = require('./models');
import * as api from '../client/src/api';

const app = express();

// TODO: configurable port
const port = process.env.PORT || 5000;

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

app.post(api.CreateSongEndpoint, (req: any, res: any) => {
  if (!api.checkCreateSongRequest(req)) {
    console.log('Invalid CreateSong request: ' + JSON.stringify(req.body));
    res.sendStatus(400);
    return;
  }
  const reqObject: api.CreateSongRequest = req.body;
  console.log("Request create song: ", reqObject); // TODO: remove
  // First check that the artist exists.
  models.Artist.findAll({
    where: { id: reqObject.artistId }
  })
    .then((artist: any[]) => {
      if (artist.length != 1) {
        console.log('Invalid CreateSong request: ' + JSON.stringify(req.body)
          + ". There is no artist with id " + reqObject.artistId + ".");
        res.sendStatus(400);
        return;
      }
      const song = models.Song.create({
        title: reqObject.title,
        ArtistId: reqObject.artistId
      });
      const responseObject: api.CreateSongResponse = {
        id: song.id
      };
      res.status(200).send(responseObject);
    })
});

app.get(api.ListSongsEndpoint, (req: any, res: any) => {
  if (!api.checkListSongsRequest(req)) {
    console.log('Invalid ListSongs request: ' + JSON.stringify(req.body));
    res.sendStatus(400);
    return;
  }
  models.Song.findAll({
    include: [models.Artist]
  })
    .then((songs: any[]) => {
      console.log(songs);
      const response: api.ListSongsResponse = songs.map((song: any) => {
        return {
          title: song.title,
          id: song.id,
          artistName: song.Artist.name,
          artistId: song.ArtistId,
        };
      });
      res.send(response);
    });
});

app.post(api.CreateArtistEndpoint, (req: any, res: any) => {
  if (!api.checkCreateArtistRequest(req)) {
    console.log('Invalid CreateArtist request: ' + JSON.stringify(req.body));
    res.sendStatus(400);
    return;
  }
  const reqObject: api.CreateArtistRequest = req.body;
  const artist = models.Artist.create(reqObject);
  const responseObject: api.CreateArtistResponse = {
    id: artist.id
  };
  res.status(200).send(responseObject);
});

app.get(api.ListArtistsEndpoint, (req: any, res: any) => {
  if (!api.checkListArtistsRequest(req)) {
    console.log('Invalid ListArtists request: ' + JSON.stringify(req.body));
    res.sendStatus(400);
    return;
  }
  models.Artist.findAll()
    .then((artists: any[]) => {
      const response: api.ListArtistsResponse = artists.map((artist: any) => {
        return {
          name: artist.name,
          id: artist.id,
        };
      });
      res.send(response);
    });
});

models.sequelize.sync().then(() => {
  app.listen(port, () => console.log(`Listening on port ${port}`));
})

export { }