import express from 'express';
import mongoose from 'mongoose';
import bcrypt from 'bcryptjs';
import UserValidate from './validate/user';
import UserModel from '../models/user';
import mail from '../helpers/mail';

const router = express.Router();

router.get('/users', (req, res) => {
  if (!req.auth(res, ['admin'], 'basic')) return;

  UserModel.find({}).lean().exec(  (err, data:any) => {
    res.json(data.map(e => UserValidate.output(e)).filter(e => e !== null));  // validate all and filter null values from validation errors
  });
});

router.get('/user/:username*?', (req, res) => {
  if (!req.auth(res, ['read', 'write', 'maintain', 'dev', 'admin'], 'basic')) return;
  let username = req.authDetails.username;
  if (req.params.username !== undefined) {
    if (!req.auth(res, ['admin'], 'basic')) return;
    username = req.params.username;
  }

  UserModel.findOne({name: username}).lean().exec(  (err, data:any) => {
    res.json(UserValidate.output(data));  // validate all and filter null values from validation errors
  });
});

router.post('/user/new', (req, res, next) => {
  if (!req.auth(res, ['admin'], 'basic')) return;

  // validate input
  const {error, value: user} = UserValidate.input(req.body);
  if(error !== undefined) {
    res.status(400).json({status: 'Invalid body format'});
    return;
  }

  // check that user does not already exist
  UserModel.find({name: user.name}).lean().exec(  (err, data:any) => {
    if (err) next(err);
    if (data.length > 0) {
      res.status(400).json({status: 'Username already taken'});
      return;
    }

    user.key = mongoose.Types.ObjectId();  // use object id as unique API key
    bcrypt.hash(user.pass, 10, (err, hash) => {  // password hashing
      user.pass = hash;
      new UserModel(user).save((err, data) => {  // store user
        if (err) next(err);
        res.json(UserValidate.output(data.toObject()));
      });
    });
  });
});

router.post('/user/passreset', (req, res, next) => {
  // check if user/email combo exists
  UserModel.find({name: req.body.name, email: req.body.email}).lean().exec( (err, data: any) => {
    if (err) next(err);
    if (data.length === 1) {  // it exists
      const newPass = Math.random().toString(36).substring(2);
      bcrypt.hash(newPass, 10, (err, hash) => {  // password hashing
        if (err) next(err);
        UserModel.findByIdAndUpdate(data[0]._id, {pass: hash}, err => {  // write new password
          if (err) next(err);
          mail(data[0].email, 'Your new password for the DFOP database', 'Hi, <br><br> You requested to reset your password.<br>Your new password is:<br><br>' + newPass + '<br><br>If you did not request a password reset, talk to the sysadmin quickly!<br><br>Have a nice day.<br><br>The DFOP team', err => {
            if (err) next(err);
            res.json({status: 'OK'});
          });
        });
      });
    }
    else {
      res.status(404).json({status: 'Not found'});
    }
  });
});

module.exports = router;