exports.newLocalStrategy= new localStrategy(
(username,password,done)=>{
  User.find({username: username},(err, user)=>{
    if (err) throw err;
    if(user.length == 0){
      console.log("Unknown User");
      return done(null,false,{message: 'unknown User'});

    }
    comparePassword(password,user[0].password, (err,isMatch)=>{
      if (err) throw err;
      if (isMatch){

        return done(null, user);
        return res.send("Loggedin");

      }else{
        console.log('invalid password');
        return done(null, false, {message:"Invalid password"});
      }
    })
  });
});
const comparePassword = (candidatePassword, hash, callback)=>{
    bcrypt.compare(candidatePassword, hash, (err, isMatch)=>{
        if (err) return callback(err);
        callback(null, isMatch);
      });
}

exports.newLocalStrategy= new localStrategy(
  (username,password,done)=>{
    //promise
    User.find({username: username})
      .then(user =>{
        if(user.length ==0){
          return done(null, false,{message: 'unknown user'})
        }
      })
      .catch(err => {return done(null,err)})
    comparePassword(password,user[0].password)
      .then(isMatch => {
        if (isMatch) return (done,null);
      })
      .catch(err=>{return done(null,err)})
});
const comparePassword = (candidatePassword, hash, callback)=>{
  return new Promise((resolve,reject)=>{
    bcrypt.compare(candidatePassword, hash, (err, isMatch)=>{
      if (err) return reject(err);
      resolve(null, isMatch);
    });
  })
}