var express = require('express');
var router = express.Router();
var utils = require('./utils');
var db = require('./DBManager');
var geolib = require('geolib');

router.post('/upsert', (req, res) => {
  if (!req.body || !req.body.title || !req.body.body || !req.body.owner_id || !req.body.address) {
    utils.response_400(res, {
      title: "Note To Self",
      body: "I know nothing!!!",
      lat: 35.01,
      lng: 51.2,
      address: "Some Where over the rainbow",
      tags: ['nofilter', 'testing', 'education'],
      owner_id: 123,
      is_public: true
    });
  } else {
    if (req.body.id) { //Update a Note
      var key = db.key(['Note', Number(req.body.id)]);
      db.get(key, (err, entity) => {
        if (err) {
          utils.response_500(res, "DB Error");
        } else {
          if (!entity) {
            utils.response_400(res, {
              title: "Note To Self",
              body: "I know nothing!!!",
              lat: 35.01,
              lng: 51.2,
              address: "Some Where over the rainbow",
              tags: ['nofilter', 'testing', 'education'],
              owner_id: 123,
              is_public: true
            }, "id not valid - No Notes with that ID");
          } else {
            entity.data.title = req.body.title || entity.data.title;
            entity.data.body = req.body.body || entity.data.body;
            entity.data.lat = req.body.lat || entity.data.lat;
            entity.data.lng = req.body.lng || entity.data.lng;
            entity.data.address = req.body.address || entity.data.address;
            entity.data.tags = req.body.tags || entity.data.tags;
            entity.data.is_public = req.body.is_public || false;
            db.save(entity, (err, _resp) => {
              if (err) {
                utils.response_500(res, "DB Error");
              } else {
                res.send({
                  status: "OK",
                  note: utils.convertToNoteObj(entity)
                });
              }
            });

          }
        }
      });
    } else { //** Create a new Note **//
      var key = db.key(['User', Number(req.body.owner_id)]);
      db.get(key, (err, entity) => {
        if (err) {
          utils.response_500(res, "DB Error");
          return;
        }
        if (!entity) {
          utils.response_400(res, null, "No User with that id!");
          return;
        }
        var user = utils.convertToUserObj(entity);
        db.save({
            key: db.key('Note'),
            data: {
              title: req.body.title,
              lat: req.body.lat,
              lng: req.body.lng,
              address: req.body.address,
              body: req.body.body,
              owner_id: req.body.owner_id,
              is_public: req.body.is_public || false,
              created_at: Date.now(),
              likes: 0,
              tags: req.body.tags || [],
              avatar: user.avatar
            }
          },
          (err, response) => {
            if (err) {
              utils.response_500(res, "DB Error");
            } else {
              res.statusCode = 201;
              var id = Number(response.mutationResults[0].key.path[0].id);
              var key = db.key(['Note', id]);
              db.get(key, (err, entity) => {
                if (!err) res.send({
                  status: "OK",
                  note: utils.convertToNoteObj(entity)
                });
                else utils.response_500(res, "DB Error->" + err);
              });
            }
          });
      });
    }
  }
});
router.get('/all', (req, res) => {
  if (!req.query.uid) {
    utils.response_400(res, "uid=123", "Missing uid in query string");
  } else {
    var query = db.createQuery('Note')
      .filter('owner_id', req.query.uid);
    //   .order('creation_time', {
    //     descending: true
    //   });
    db.runQuery(query, (err, entities) => {
      if (err || entities.length < 1) {
        res.send({
          status: (err ? "Error" : "OK"),
          message: err ? "DB error, " + err : "No Notes",
          notes: (err ? null : [])
        });
      } else {
        entities = entities.map(utils.convertToNoteObj);
        res.send({
          status: "OK",
          notes: entities
        });
      }
    });
  }
});


router.post('/like', (req, res) => {
  if (!req.body.uid || !req.body.nid) {
    utils.response_400(res, {
      uid: 123,
      nid: 555
    });
  } else {
    var userKey = db.key(['User', Number(req.body.uid)]);
    var noteKey = db.key(['Note', Number(req.body.nid)]);
    db.get(userKey, (err, entity) => {
      var user;
      if (err || !entity) {
        utils.response_500(res, "No User OR DB Error");
      } else {
        user = utils.convertToUserObj(entity);
        db.get(noteKey, (err, _entity) => {
          if (err || !_entity) {
            utils.response_500(res, "No Note OR DB Error");
          } else {
            if (user.liked_notes_id.indexOf(Number(req.body.nid)) < 0) {
              entity.data.liked_notes_id.push(Number(req.body.nid));
              _entity.data.likes++;
            }
            db.save(entity, (err) => {});
            db.save(_entity, (err) => {});
            res.send({
              status: "OK",
              user: utils.convertToUserObj(entity),
              note: utils.convertToNoteObj(_entity)
            });
          }
        });
      }
    });
  }
});

router.post('/getPublic', (req, res) => {
  if (!req.body.id) {
    utils.response_400(res, {
      id: 123,
      filter: {
        location: {
          distance: 5,
          lat: 32.555,
          lng: 35.222
        },
        tags: ['bestTag'],
        since: 1487362
      }
    }, "filter is optional");
  } else {
    var query = db.createQuery('Note')
      .filter('is_public', true);

    db.runQuery(query, (err, entities) => {
      if (!entities) {
        res.send({
          status: "OK",
          notes: []
        });
        return;
      }
      var notes = entities.map(utils.convertToNoteObj);
      notes = notes.filter((n) => {
        if (Number(n.owner_id) !== Number(req.body.id)) return true;
        return false;
      });
      if (req.body.filter) {
        if (req.body.filter.location) {
          notes = notes.filter((note) => {
            if (geolib.getDistance({
                latitude: note.location.lat,
                longitude: note.location.lng
              }, {
                latitude: req.body.filter.location.lat,
                longitude: req.body.filter.location.lng
              }) <= req.body.filter.location.distance) return true;
            return false;
          });
        }
        if (req.body.filter.tags) {
          notes = notes.filter((note) => {
            for (var i = 0; i < req.body.filter.tags.length; i++) {
              if (note.tags.indexOf(req.body.filter.tags[i]) >= 0) return true;
            }
            return false;
          });
        }
        if (req.body.filter.since) {
          notes = notes.filter((note) => {
            if (note.created_at > req.body.filter.since) return true;
            return false;
          });
        }
      }
      res.send({
        status: "OK",
        notes: notes
      });
    });
  }
});

router.post('/delete', (req, res) => {
  if (!req.body.uid || !req.body.nid) {
    utils.response_400(res, {
      uid: 123,
      nid: 123
    });
    return;
  }
  var key = db.key(['Note', Number(req.body.nid)]);
  db.get(key, (err, entity) => {
    if (!entity || Number(utils.convertToNoteObj(entity)
        .owner_id) != Number(req.body.uid)) {
      utils.response_400(res, null, "The Note not exists OR he is not the owner of the note");
      return;
    }
    db.delete(key, (err, apiResp) => {
      if (!err) {
        res.send({
          status: "OK",
          message: "Note Deleted"
        });
        return;
      }
      utils.response_500(res, "Error while Deleting Note");
    });
  });
});



module.exports = router;