public class LoginActivity extends AppCompatActivity {
    //private final String clientId = "your-client-id";
    //private final String clientSecret = "password";
    //private final String redirectUri = "your://redirecturi";

    private final String CONTENT_TYPE = "application/x-www-form-urlencoded;charset=utf-8";
    private final String AUTHORIZATION = "Basic d2ViOnNlY3JldA==";

    TextInputEditText edt_user_account;
    TextInputEditText edt_password;
    CheckBox chk_rememberme;
    Button btn_login;
    private String PREFS_KEY = "mispreferencias";

    AccessToken access_token;
    String user = null;
    String password = null;

    SharedPreferences prefs = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);

        getSupportActionBar().hide();


        btn_login = (Button) findViewById(R.id.btn_login);
        chk_rememberme = (CheckBox) findViewById(R.id.chk_rememberme);
        edt_user_account = (TextInputEditText) findViewById(R.id.edt_user_account);
        edt_password = (TextInputEditText) findViewById(R.id.edt_password);

        prefs = getSharedPreferences("MyPreferencesG11", Context.MODE_PRIVATE);
        user = prefs.getString("user_account", "");
        password = prefs.getString("password", "");
        //String user = "jvelasquez@applying.pe";
        //String password = "123456789";
        if(user!=null&&!user.isEmpty()&&password!=null&&!password.isEmpty()){
            login();
        }else {
            btn_login.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    user = edt_user_account.getText().toString();
                    password = edt_password.getText().toString();
                    if (password != null && !password.isEmpty() && user != null && !user.isEmpty()) {
                        login();
                    } else if (user == null || user.isEmpty())
                        Toast.makeText(getApplicationContext(), getString(R.string.user_is_required), Toast.LENGTH_SHORT).show();
                    else if (password == null || password.isEmpty())
                        Toast.makeText(getApplicationContext(), getString(R.string.password_is_required), Toast.LENGTH_SHORT).show();

                }
            });
        }
    }

    private void login() {
        LoginService loginService = ServiceGenerator.createService(LoginService.class);
        Call<AccessToken> call = loginService.getAccessToken("password", password, user, CONTENT_TYPE, AUTHORIZATION);

        call.enqueue(new Callback<AccessToken>() {

            @Override
            public void onResponse(Call<AccessToken> call, Response<AccessToken> response) {
//                     if (response.isSuccess()) {
                if (response.code() == 200) {
                    access_token = response.body();
                    System.out.println("LOGIN ACCESS TOKEN ->"+access_token.getAccess_token());

                    final SharedPreferences.Editor editor = prefs.edit();
                    editor.remove("user_account");
                    editor.remove("password");
                    editor.remove("access_token");
                    editor.remove("user_bean");
                    editor.commit();

                    if(chk_rememberme.isChecked()) {
                        editor.putString("user_account", user);
                        editor.putString("password", password);
                    }

                    editor.putString("access_token", access_token.getAccess_token());

                    /*DATOS DEL USUARIO*/
                    LoginService loginService = ServiceGenerator.createService(LoginService.class);
                    Call<UserAccountBean> callMe = loginService.getUserLogged(access_token.getAccess_token());

                    callMe.enqueue(new Callback<UserAccountBean>() {
                        @Override
                        public void onResponse(Call<UserAccountBean> call, Response<UserAccountBean> response) {
                            UserAccountBean userAccountBean = response.body();
                            editor.putString("user_fisrt_name",userAccountBean.getFirstName());
                            editor.putString("user_pattern_name",userAccountBean.getPatternName());
                            editor.putString("user_mail",userAccountBean.getUsername());
                            editor.putLong("user_id",userAccountBean.getId());

                            editor.commit();
                            editor.apply();
                            Intent intent = new Intent(getApplicationContext(), DashboardActivity.class);

                            startActivity(intent);
                            finish();
                        }

                        @Override
                        public void onFailure(Call<UserAccountBean> call, Throwable t) {

                        }
                    });
                } else {
                    Toast.makeText(getApplicationContext(), getString(R.string.login_failed), Toast.LENGTH_SHORT).show();
                }
            }

            @Override
            public void onFailure(Call<AccessToken> call, Throwable t) {
                // something went completely south (like no internet connection)
                Toast.makeText(getApplicationContext(), R.string.login_error, Toast.LENGTH_SHORT).show();
                Log.d("Error", t.getMessage());
            }
        });
    }
}