const UserModel = require("../models/user.model");
const ObjectID = require("mongoose").Types.ObjectId;

//-password pour ne pas donner le password
module.exports.getAllUsers = async (req, res) => {
  const users = await UserModel.find().select("-password");
  res.status(200).json(users);
};

//req.params par url
module.exports.userInfo = (req, res) => {
  if (!ObjectID.isValid(req.params.id))
    return res.status(400).send("ID unknown : " + req.params.id);

  UserModel.findById(req.params.id, (err, docs) => {
    if (!err) res.send(docs);
    else console.log("ID unknown : " + err);
  }).select("-password");
};

module.exports.updateUser = async (req, res) => {
  if (!ObjectID.isValid(req.params.id))
    return res.status(400).send("ID unknown : " + req.params.id);

  try {
    await UserModel.findOneAndUpdate(
      { _id: req.params.id },
      {
        $set: {
          bio: req.body.bio,
        },
      },
      { new: true, upsert: true, setDefaultsOnInsert: true })
      .then((data) => res.send(data))
      .catch((err) => res.status(500).send({ message: err }));
  } catch (err) {
    return res.status(500).json({ message: err });
  }
};

module.exports.deleteUser = async (req, res) => {
  if (!ObjectID.isValid(req.params.id))
    return res.status(400).send("ID unknown : " + req.params.id);

  try {
    await UserModel.remove({ _id: req.params.id }).exec();
    res.status(200).json({ message: "Successfully deleted. " });
  } catch (err) {
    return res.status(500).json({ message: err });
  }
};

module.exports.follow = async (req, res) => {
  if (
    !ObjectID.isValid(req.params.id) ||
    !ObjectID.isValid(req.body.idToFollow)
  )
    return res.status(400).send("ID unknown : " + req.params.id);

  try {
    // add to the follower list
     await UserModel.findByIdAndUpdate(
      req.params.id,
      { $addToSet: { following: req.body.idToFollow }, },
      { new: true , upsert: true },
      (err, docs) => {
        if (!err) return res.send(docs);
          else return res.status(200).send(err);
      }
    )
      // ajouter à la liste des followers
      await UserModel.findByIdAndUpdate(
        req.body.idToFollow,
        { $addToSet: { followers: req.params.id }, },
        { new: true , upsert: true},
        (err, docs) => {
          if (!err) return res.send(docs);
          else return res.status(200).send(err);
        }
      );
  } catch (err) {
    return res.status(400).send(err);
  }
};

module.exports.unfollow = async (req, res) => {
  if (
    !ObjectID.isValid(req.params.id) ||
    !ObjectID.isValid(req.body.idToUnfollow)
  )
    return res.status(400).send("ID unknown : " + req.params.id);

  try {
    await userModel.findByIdAndUpdate(
      req.params.id,
      { $pull: { following: req.body.idToUnfollow ,} },
      { new: true , upsert: true },
      (err, docs) => {
        if (err) return res.status(400).send(err);
      }
    );

      // Retirer de la liste des followers
      await userModel.findByIdAndUpdate(
        req.body.idToUnfollow,
        { $pull: { followers: req.params.id } },
        { new: true , upsert: true},
        (err, docs) => {
          if (!err) return res.send(docs);
          else return res.status(400).send(err);
        }
      );
  } catch (err) {
      return res.status(401).send(err);
  }
}