const userSchema = new Schema({
  userName: { type: String, unique: true, required: true },
  hashPassword: { type: String, required: true },
  firstName: { type: String, required: true },
  lastName: { type: String, required: true },
  userAge: { type: Number, required: true },
  userDetails: { type: String, required: true },
  userCreatedOn: { type: Date, default: Date.now }
});

const taskSchema = new Schema({
  //Below is userAssigned which is ref for above User document.
  userAssigned: { type: Schema.Types.ObjectId, ref: User},
  taskDesc: { type: String, required: true },
  taskCreatedOn: { type: Date, default: Date.now },
  taskDueDate: { type: Date, required: true }
});

async function getAllUserTasks(userParam) {
  return await Task.find({ userAssigned: userParam.userId })
    .lean()
    .sort({ taskDueDate: "asc" });
}

async function createTask(userParam) {
  if (await User.findOne({ _id: userParam.userAssigned })) {
    const task = new Task(userParam);
    await task.save();
  } else {
    throw "User does not exist";
  }
}

async function updateTask(id, userParam) {
  return await Task.findOneAndUpdate(
    { _id: id },
    userParam,
    {
      new: true,
      overwrite: true
    },
    function(err) {
      if (err) return err;
    }
  );
}

async function deleteUserTask(id) {
  return await Task.findByIdAndRemove(id, function(err) {
    if (err) {
      return err;
    }
  });
}