const UserModel = require('../models/userModel.js');
/**
 * userController.js
 *
 * @description :: Server-side logic for managing users.
 */
module.exports = {

  /**
   * userController.list()
   */
  list: function (req, res) {
    UserModel.find(function (err, users) {
      if (err) {
        return res.status(500).json({
          message: 'Error when getting user.',
          error: err
        });
      }

      return res.json(users);
    });
  },

  /**
   * userController.show()
   */
  show: function (req, res) {
    const id = req.params.id;

    UserModel.findOne({ _id: id }, function (err, user) {
      if (err) {
        return res.status(500).json({
          message: 'Error when getting user.',
          error: err
        });
      }

      if (!user) {
        return res.status(404).json({
          message: 'No such user'
        });
      }

      return res.json(user);
    });
  },

  /**
   * userController.create()
   */
  create: function (req, res) {
    const user = new UserModel({
      username: req.body.username,
      password: req.body.password,
      email: req.body.email,
      locations: []
    });

    user.save(function (err, user) {
      if (err) {
        return res.status(500).json({
          message: 'Error when creating user',
          error: err
        });
      }

      return res.status(201).json(user);
    });
  },

  /**
   * userController.update()
   */
  update: function (req, res) {
    const id = req.params.id;

    UserModel.findOne({ _id: id }, function (err, user) {
      if (err) {
        return res.status(500).json({
          message: 'Error when getting user',
          error: err
        });
      }

      if (!user) {
        return res.status(404).json({
          message: 'No such user'
        });
      }

      user.username = req.body.username ? req.body.username : user.username;
      user.password = req.body.password ? req.body.password : user.password;
      user.email = req.body.email ? req.body.email : user.email;


      user.save(function (err, user) {
        if (err) {
          return res.status(500).json({
            message: 'Error when updating user.',
            error: err
          });
        }

        return res.json(user);
      });
    });
  },

  /**
   * userController.remove()
   */
  remove: function (req, res) {
    const id = req.params.id;

    UserModel.findByIdAndRemove(id, function (err, user) {
      if (err) {
        return res.status(500).json({
          message: 'Error when deleting the user.',
          error: err
        });
      }

      return res.status(204).json();
    });
  },

  showRegister: function (req, res) {
    res.render('user/register');
  },

  showLogin: function (req, res) {
    res.render('user/login');
  },

  login: function (req, res, next) {
    UserModel.authenticate(req.body.username, req.body.password, function (err, user) {
      if (err || !user) {
        const err = new Error('Wrong username or paassword');
        err.status = 401;
        return next(err);
      }
      req.session.userId = user._id;

      return res.json(user);
    });
  },

  logout: function (req, res, next) {
    if (req.session) {
      req.session.destroy(function (err) {
        if (err) {
          return next(err);
        } else {
          //return res.redirect('/');
          return res.status(201).json({});
        }
      });
    }
  },

  profile: function (req, res, next) {
    UserModel.findById(req.session.userId)
      .exec(function (error, user) {
        if (error) {
          return next(error);
        } else {
          if (user === null) {
            const err = new Error('Not authorized, go back!');
            err.status = 400;
            return next(err);
          } else {
            //return res.render('user/profile', user);
            return res.json(user);
          }
        }
      });
  },

  addLocation: function (req, res) {
    const locationID = req.params.id;

    UserModel.findOne({ _id: req.session.userId }, function (err, user) {
      if (err) {
        return res.status(500).json({
          message: 'Error when getting user',
          error: err
        });
      }

      if (!user) {
        return res.status(404).json({
          message: 'No such user'
        });
      }

      if (user.locations.includes(locationID)) {
        return res.status(400).json({
          message: 'Location already added'
        });
      }

      user.locations.push(locationID);

      user.save(function (err, user) {
        if (err) {
          return res.status(500).json({
            message: 'Error when updating user.',
            error: err
          });
        }

        return res.json(user);
      });
    });

  },

  checkLocation: function (req, res) {
    UserModel.findOne({ _id: req.session.userId }, function (err, user) {
      if (err) {
        return res.status(500).json({
          message: 'Error when getting user',
          error: err
        });
      }

      if (!user) {
        return res.status(404).json({
          message: 'No such user'
        });
      }

      return res.json(user.locations);
    });
  }
};