package markgordienko.carcare;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.InputFilter;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class registration extends AppCompatActivity {

    Button regbutt;
    EditText regemailfield, regpassfield;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_registration);
        regbutt = (Button) findViewById(R.id.regbutt);
        regemailfield = (EditText) findViewById(R.id.regemailfield);
        regpassfield = (EditText) findViewById(R.id.regpassfield);

        int maxLength = 16;
        regemailfield.setFilters(new InputFilter[] {new InputFilter.LengthFilter(maxLength)});
        regpassfield.setFilters(new InputFilter[] {new InputFilter.LengthFilter(maxLength)});

        regbutt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String login,password,pass;
                boolean bool;
                String salt = "salt";
                login = regemailfield.getText().toString();
                pass = regpassfield.getText().toString();
                if ((login.matches("")||pass.matches(""))){
                    Toast.makeText(registration.this,"Вы не ввели логин или пароль",Toast.LENGTH_LONG).show();
                }
                else{
                password = get_SHA_512_SecurePassword(pass, salt);
                DatabaseAccess databaseAccess = DatabaseAccess.getInstance(getApplicationContext());
                databaseAccess.open();
                bool = databaseAccess.Reg(login,password);
                if (bool == true){
                    Toast.makeText(registration.this,"Успешно!",Toast.LENGTH_SHORT).show();
                    LogIn.user = login;
                    LogIn.ed.putString(LogIn.saved_text,login);
                    LogIn.ed.commit();
                Intent myintent = new Intent(registration.this, Chose.class);
                startActivity(myintent);}
                else{
                    Toast.makeText(registration.this,"Имя пользователя уже занято",Toast.LENGTH_LONG).show();
                }
                }
            }
        });
    }

    public String get_SHA_512_SecurePassword(String passwordToHash, String   salt){
        String generatedPassword = null;
        try {
            MessageDigest md = MessageDigest.getInstance("SHA-512");
            md.update(salt.getBytes(StandardCharsets.UTF_8));
            byte[] bytes = md.digest(passwordToHash.getBytes(StandardCharsets.UTF_8));
            StringBuilder sb = new StringBuilder();
            for(int i=0; i< bytes.length ;i++){
                sb.append(Integer.toString((bytes[i] & 0xff) + 0x100, 16).substring(1));
            }
            generatedPassword = sb.toString();
        }
        catch (NoSuchAlgorithmException e){
            e.printStackTrace();
        }
        return generatedPassword;
    }
}