Controller

const User = require('../models/auth.model')
const expressJwt = require('express-jwt')
const _ = require('lodash');
const {OAuth2Client} = require('google-auth-library')
const fetch = import('node-fetch')
const {validationResult} = require('express-validator')
const jwt = require('jsonwebtoken')
//custom error handler to get useful error from database errors
const {errorHandler} = require ('../helpers/dbErrorHandling')
//I will use nodemailer for send email
const nodemailer = require('nodemailer')

const transporter = nodemailer.createTransport({
    service: "hotmail",
    auth : {
        user: mail,
        pass: password
    }

})

exports.registerController = (req,res) => {
   const{name , email , password} = req.body
   //Extracts the validation errors from a request and makes them available in a Result object.
   const errors = validationResult(req);

   if (!errors.isEmpty()) {
       const firstError = errors.array().map(error => error.msg)[0]
       return res.status(422).json({
           error: firstError
       })
   }
    else{
        User.findOne({
            email
        }).exec((err , user) => {
            //If user exists
            if(user) {
                return res.status(400).json({
                    error: "Email is taken"
                })
            }
        })

        //Generate Token
        const token = jwt.sign({
            name,
            email,
            password
        },
        process.env.JWT_ACCOUNT_ACTIVATION,
        {
            expiresIn: '15min'
        }
        )
        const emailData = {
            from: process.env.EMAIL_FROM,
            to : to,
            subject: "Account activation link",
            hmtl: `
            <h1>Please Click on link to activate </h1>
            <p>${process.env.CLIENT_URL}/activate/${token}</p>
            <hr/>
            <p>This email contain sensitive info</p>
            <p>${process.env.CLIENT_URL}
                `
        }

        transporter.sendMail(options , function(err,info)  {
            if(err){
                console.log(err)
                return;
            }
            console.log("Sent: " + info.response)
        })
    }
}

//Activation and save to database
exports.activationController = (req,res) => {
    const {token} = req.body
    if(token){
        //Verify the token is valid or not or expired
    jwt.verify(token , process.env.JWT_ACCOUNT_ACTIVATION ,
        (err , decoded) => {
            if(err){
                return res.status(401).json({
                    error: "Expired Token , Signup again"
                })
            }
            else{
                //if valid save to database
                //Get name email password from token
                const {name , email , password} = jwt.decode(token)

                const user = new User({
                    name ,
                    email ,
                    passsword
                })

                user.save((err,user) => {
                    if(err){
                        return res.status(401).json({
                            error: errorHandler(err)
                        })
                    }
                    else{
                        return res.json({
                            success: true ,
                            message: "Signup successful",
                            user
                        })
                    }
                })

            }
        })

    }
    else{
        return res.json({
            message: "error happening please try again"
        })
    }

}