package markgordienko.carcare;

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


public class LogIn extends AppCompatActivity {
    Button logbutt;
    EditText logfield , passfield;
    static String user;
    static SharedPreferences prefs;
    static String saved_text;
    static Editor ed;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_log_in);
        logbutt = (Button) findViewById(R.id.logbutt);
        logfield = (EditText) findViewById(R.id.logfield);
        passfield = (EditText) findViewById(R.id.passfield);

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


            prefs = getPreferences(MODE_PRIVATE);
        ed = prefs.edit();
        user = prefs.getString(user,"");

            if (user != ""){
                Intent myintent = new Intent(LogIn.this, Main.class);
                startActivity(myintent);
            }

        logbutt.setOnClickListener(new View.OnClickListener() {
            @Override


            public void onClick(View view) {
                String login , password, passwordhash;
                login = logfield.getText().toString();
                password = passfield.getText().toString();
                String salt = "salt";
                passwordhash = get_SHA_512_SecurePassword(password, salt);

                DatabaseAccess databaseAccess=DatabaseAccess.getInstance(getApplicationContext());
                databaseAccess.open();
                boolean bool = databaseAccess.LogIn(login,passwordhash);
                if (bool==true){
                    Toast.makeText(LogIn.this,"Успешно!",Toast.LENGTH_LONG).show();

                    user = logfield.getText().toString();
                    prefs = getPreferences(MODE_PRIVATE);
                    ed = prefs.edit();

                    ed.putString(saved_text,logfield.getText().toString());
                    ed.putBoolean("isLog",true);
                    ed.commit();

                    Intent myintent = new Intent(LogIn.this, Main.class);
                    startActivity(myintent);
                }
                else {
                    Toast.makeText(LogIn.this,"Неверный логин или пароль",Toast.LENGTH_LONG).show();
                }
            }
        });
    }
    public void sendMessage(View view){
        Intent intent = new Intent(this, registration.class);
        startActivity(intent);
    }

    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;
    }
    @Override
    public void onBackPressed() {
    }
}