private lateinit var mAuth:FirebaseAuth
private lateinit var mAuthListener:FirebaseAuth.AuthStateListener


class LoginActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_login)
    val goto=Intent(this,book_slot::class.java)

    val admin=loginName.toString()
    val admin_pass=loginPassword.toString()
    registerButton.setOnClickListener{
        startActivity(Intent(this,register_page::class.java))
    }

    signInButton.setOnClickListener {
        mAuth.signInWithEmailAndPassword(admin,admin_pass).addOnCompleteListener(this) { task ->
            if(task.isSuccessful) {
                val user= mAuth.currentUser
                Toast.makeText(this,"$user",Toast.LENGTH_LONG).show()
                startActivity(goto)
            } else {
                Toast.makeText(this,"Login error",Toast.LENGTH_LONG).show()
            }
        }
    }
}