const router = require('express').Router();
const mongoose = require('mongoose');
const TrackData = mongoose.model('TrackData');
const Track = mongoose.model('Track');
const Comment = mongoose.model('Comment');
const User = mongoose.model('User');
const auth = require('../auth');
const currentTracks = new Map();
const TrackInfo = require('../../logic/TrackInfo');
const { addPointsToTrack } = require('../../logic/tracks');

// Preload track objects on routes with ':track'
router.param('track', function (req, res, next, slug) {
  Track.findOne({ slug: slug })
    .populate('author')
    .then(function (track) {
      if (!track) {
        return res.sendStatus(404);
      }

      req.track = track;

      return next();
    })
    .catch(next);
});

router.param('comment', function (req, res, next, id) {
  Comment.findById(id)
    .then(function (comment) {
      if (!comment) {
        return res.sendStatus(404);
      }

      req.comment = comment;

      return next();
    })
    .catch(next);
});

router.get('/', auth.optional, function (req, res, next) {
  const query = {};
  let limit = 20;
  let offset = 0;

  if (typeof req.query.limit !== 'undefined') {
    limit = req.query.limit;
  }

  if (typeof req.query.offset !== 'undefined') {
    offset = req.query.offset;
  }

  if (typeof req.query.tag !== 'undefined') {
    query.tagList = { $in: [req.query.tag] };
  }

  Promise.all([
    req.query.author ? User.findOne({ username: req.query.author }) : null,
    req.query.favorited ? User.findOne({ username: req.query.favorited }) : null,
  ])
    .then(function (results) {
      const author = results[0];
      const favoriter = results[1];

      if (author) {
        query.author = author._id;
      }

      if (favoriter) {
        query._id = { $in: favoriter.favorites };
      } else if (req.query.favorited) {
        query._id = { $in: [] };
      }

      return Promise.all([
        Track.find(query)
          .limit(Number(limit))
          .skip(Number(offset))
          .sort({ createdAt: 'desc' })
          .populate('author')
          .where('visible')
          .equals(true)
          .exec(),
        Track.countDocuments(query).exec(),
        req.payload ? User.findById(req.payload.id) : null,
      ]).then(function (results) {
        const tracks = results[0];
        // const tracksCount = results[1];
        const user = results[2];
        // console.log(tracks);
        const retTracks = [];
        for (const t of tracks) {
          // console.log(t);
          // if (t.author.areTracksVisibleForAll || t.author == user) {
          retTracks.push(t);
          // }
        }
        return res.json({
          tracks: retTracks.map(function (track) {
            return track.toJSONFor(user);
          }),
          tracksCount: retTracks.length,
        });
      });
    })
    .catch(next);
});

router.get('/feed', auth.required, function (req, res, next) {
  let limit = 20;
  let offset = 0;

  if (typeof req.query.limit !== 'undefined') {
    limit = req.query.limit;
  }

  if (typeof req.query.offset !== 'undefined') {
    offset = req.query.offset;
  }

  User.findById(req.payload.id).then(function (user) {
    if (!user) {
      return res.sendStatus(401);
    }
    if (user.following !== '') {
      Promise.all([
        Track.find({ author: { $in: user.following } })
          .limit(Number(limit))
          .skip(Number(offset))
          .populate('author')
          .exec(),
        Track.countDocuments({ author: { $in: user.following } }),
      ])
        .then(function (results) {
          const tracks = results[0];
          const tracksCount = results[1];

          return res.json({
            tracks: tracks.map(function (track) {
              return track.toJSONFor(user);
            }),
            tracksCount: tracksCount,
          });
        })
        .catch(next);
    } else {
      Promise.all([
        Track.find({ author: { $in: req.payload.id } })
          .limit(Number(limit))
          .skip(Number(offset))
          .populate('author')
          .exec(),
        Track.countDocuments({ author: { $in: req.payload.id } }),
      ])
        .then(function (results) {
          const tracks = results[0];
          const tracksCount = results[1];

          return res.json({
            tracks: tracks.map(function (track) {
              return track.toJSONFor(user);
            }),
            tracksCount: tracksCount,
          });
        })
        .catch(next);
    }
  });
});

router.post('/', auth.required, function (req, res, next) {
  User.findById(req.payload.id)
    .then(function (user) {
      if (!user) {
        return res.sendStatus(401);
      }

      const track = new Track(req.body.track);
      const trackData = new TrackData();
      track.trackData = trackData._id;

      track.author = user;
      track.visible = track.author.areTracksVisibleForAll;
      trackData.save(function (err) {
        if (err) {
          console.log('failed to save trackData');
        }
      });

      return track.save().then(function () {
        // console.log(track.author);
        return res.json({ track: track.toJSONFor(user) });
      });
    })
    .catch(next);
});

router.post('/add', auth.optional, function (req, res, next) {
  // console.log("Add");

  // console.log(req.payload);
  User.findById(req.body.id)
    .then(function (user) {
      if (!user) {
        return res.sendStatus(401);
      }

      let ti = null;
      if (currentTracks.has(req.body.id)) ti = currentTracks.get(req.body.id);

      // console.log("TI" + ti);
      // console.log("TILen" + ti.trackData.points.length);
      // console.log("TITrack" + ti.track);
      // console.log("Body" + req.body.track.body);
      if (ti.track) {
        addPointsToTrack(ti, req.body.track.body);
        // console.log("TLen" + ti.trackData.points.length);
        ti.track.author = user;
      }

      // return track.save().then(function(){
      //  console.log(track.author);
      // return res.json({ track: track.toJSONFor(user) });
      return res.sendStatus(200);
      // });
    })
    .catch(next);
});

router.post('/begin', auth.optional, function (req, res, next) {
  // console.log("Begin");
  // console.log(req.payload);
  User.findById(req.body.id)
    .then(function (user) {
      if (!user) {
        return res.sendStatus(401);
      }

      if (currentTracks.has(req.body.id)) currentTracks.delete(req.body.id); // delete old parts if there are leftovers
      const ti = new TrackInfo(new Track(req.body.track), new TrackData());
      ti.track.trackData = ti.trackData._id;
      currentTracks.set(req.body.id, ti);

      // console.log("addToTrack"+req.body);

      addPointsToTrack(ti, ti.track.body);

      // console.log("TLen" + ti.track);
      // console.log("TLen" + ti.trackData);
      // console.log("TLen" + ti.trackData.points.length);

      // console.log(track.trackData.points[0].date);
      ti.track.author = user;

      // return track.save().then(function () {
      //  console.log(track.author);
      return res.sendStatus(200);
      // });
    })
    .catch(next);
});

router.post('/end', auth.optional, function (req, res, next) {
  // console.log("End");
  // console.log(req.payload);
  User.findById(req.body.id)
    .then(function (user) {
      if (!user) {
        return res.sendStatus(401);
      }

      let ti;
      if (currentTracks.has(req.body.id)) {
        ti = currentTracks.get(req.body.id);
        addPointsToTrack(ti, req.body.track.body);
      } else {
        ti = new TrackInfo(new Track(req.body.track), new TrackData());
        ti.track.trackData = ti.trackData._id;
        addPointsToTrack(ti, ti.track.body);
      }
      if (ti.track) {
        ti.track.author = user;
      }

      currentTracks.delete(req.body.id); // we are done with this track, it is complete
      ti.track.author = user;

      // console.log(track);
      // console.log("user:"+user);
      return ti.track.save().then(function () {
        // console.log("TLen" + ti.track);
        // console.log("TLen" + ti.trackData);
        // console.log("TLen" + ti.trackData.points.length);
        ti.trackData.save(function (err) {
          if (err) {
            console.log('failed to save trackData' + err.toString());
          }
        });

        console.log('successfulSave:');
        return res.sendStatus(200);
      });
    })
    .catch(next);
});

// return a track
router.get('/:track', auth.optional, function (req, res, next) {
  Promise.all([req.payload ? User.findById(req.payload.id) : null, req.track.populate('author').execPopulate()])
    .then(function (results) {
      const user = results[0];

      return res.json({ track: req.track.toJSONFor(user, { body: true }) });
    })
    .catch(next);
});

// update track
router.put('/:track', auth.required, async function (req, res, next) {
  const user = await User.findById(req.payload.id);

  if (req.track.author._id.toString() !== req.payload.id.toString()) {
    return res.sendStatus(403);
  }

  if (typeof req.body.track.title !== 'undefined') {
    req.track.title = req.body.track.title;
  }

  if (typeof req.body.track.description !== 'undefined') {
    req.track.description = req.body.track.description;
  }

  if (req.body.track.body?.trim()) {
    req.track.body = req.body.track.body.trim();

    let trackData = await TrackData.findById(req.track.trackData);
    if (!trackData) {
      trackData = new TrackData();
      req.track.trackData = trackData._id;
    }
    trackData.points = [];
    addPointsToTrack({ trackData }, req.track.body);
    await trackData.save();
  }

  if (typeof req.body.track.tagList !== 'undefined') {
    req.track.tagList = req.body.track.tagList;
  }
  req.track.visible = req.body.track.visible;

  const track = await req.track.save();
  return res.json({ track: track.toJSONFor(user) });
});

// delete track
router.delete('/:track', auth.required, function (req, res, next) {
  User.findById(req.payload.id)
    .then(function (user) {
      if (!user) {
        return res.sendStatus(401);
      }
      if (req.track.author._id.toString() === req.payload.id.toString()) {
        TrackData.findByIdAndDelete(req.track.trackData, function (err, td) {
          console.log('doneDelete');
        }); // delet our track data
        return req.track.remove().then(function () {
          return res.sendStatus(204);
        });
      } else {
        return res.sendStatus(403);
      }
    })
    .catch(next);
});

// Favorite an track
router.post('/:track/favorite', auth.required, function (req, res, next) {
  const trackId = req.track._id;

  User.findById(req.payload.id)
    .then(function (user) {
      if (!user) {
        return res.sendStatus(401);
      }

      return user.favorite(trackId).then(function () {
        return req.track.updateFavoriteCount().then(function (track) {
          return res.json({ track: track.toJSONFor(user) });
        });
      });
    })
    .catch(next);
});

// Unfavorite an track
router.delete('/:track/favorite', auth.required, function (req, res, next) {
  const trackId = req.track._id;

  User.findById(req.payload.id)
    .then(function (user) {
      if (!user) {
        return res.sendStatus(401);
      }

      return user.unfavorite(trackId).then(function () {
        return req.track.updateFavoriteCount().then(function (track) {
          return res.json({ track: track.toJSONFor(user) });
        });
      });
    })
    .catch(next);
});

// return an track's comments
router.get('/:track/comments', auth.optional, function (req, res, next) {
  Promise.resolve(req.payload ? User.findById(req.payload.id) : null)
    .then(function (user) {
      return req.track
        .populate({
          path: 'comments',
          populate: {
            path: 'author',
          },
          options: {
            sort: {
              createdAt: 'desc',
            },
          },
        })
        .execPopulate()
        .then(function (track) {
          return res.json({
            comments: req.track.comments.map(function (comment) {
              return comment.toJSONFor(user);
            }),
          });
        });
    })
    .catch(next);
});

// create a new comment
router.post('/:track/comments', auth.required, function (req, res, next) {
  User.findById(req.payload.id)
    .then(function (user) {
      if (!user) {
        return res.sendStatus(401);
      }

      const comment = new Comment(req.body.comment);
      comment.track = req.track;
      comment.author = user;

      return comment.save().then(function () {
        req.track.comments.push(comment);

        return req.track.save().then(function (track) {
          res.json({ comment: comment.toJSONFor(user) });
        });
      });
    })
    .catch(next);
});

router.delete('/:track/comments/:comment', auth.required, function (req, res, next) {
  if (req.comment.author.toString() === req.payload.id.toString()) {
    req.track.comments.remove(req.comment._id);
    req.track
      .save()
      .then(Comment.find({ _id: req.comment._id }).remove().exec())
      .then(function () {
        res.sendStatus(204);
      });
  } else {
    res.sendStatus(403);
  }
});

// return an track's trackData
router.get('/:track/TrackData', auth.optional, function (req, res, next) {
  Promise.resolve(req.payload ? User.findById(req.payload.id) : null)
    .then(function (user) {
      // console.log("requestTrackData"+req.track);
      TrackData.findById(req.track.trackData, function (err, trackData) {
        // console.log({trackData: trackData});
        return res.json({ trackData: trackData });
      });
    })
    .catch(next);
});

module.exports = router;