package cz.vema.mobile.mvl.activities;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.TargetApi;
import android.content.Intent;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.support.design.widget.TextInputEditText;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.AppCompatCheckBox;
import android.text.TextUtils;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.inputmethod.EditorInfo;
import android.widget.Button;
import android.widget.CompoundButton;
import android.widget.TextView;
import android.widget.Toast;

import com.crashlytics.android.Crashlytics;
import com.crashlytics.android.answers.Answers;
import com.crashlytics.android.answers.ContentViewEvent;

import cz.msebera.android.httpclient.Header;
import cz.vema.mobile.mvl.BuildConfig;
import cz.vema.mobile.mvl.R;
import cz.vema.mobile.mvl.client.MVLRestClientFactory;
import cz.vema.mobile.mvl.client.VmJswsResponseHandler;
import cz.vema.mobile.mvl.security.AesUtils;
import cz.vema.mobile.mvl.utils.Preferences;

/**
 * A login screen that offers login via email/password.
 */
public class LoginActivity extends AppCompatActivity {

    public static final String TAG = "MVL.LoginActivity";

    /**
     * Keep track of the login task to ensure we can cancel it if requested.
     */
    private Boolean mAuthTask = null;

    // UI references.
    private TextInputEditText mEmailView;
    private TextInputEditText mPinView;
    private View mProgressView;
    private View mLoginFormView;
    private AppCompatCheckBox mCheckboxView;
    private boolean doAutoLogin;
    boolean isSecured;
    VmJswsResponseHandler loginHandler;

    // Special case when autologin failed
    // Application does not have stored a plain PIN,
    // so we set a special string to catch this case in login submit
    private static String AUTOLOGIN_FAKE_PIN = "_AUTOLOGIN_";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.i(TAG, "onCreate()");
        setContentView(R.layout.activity_login);
        if (!BuildConfig.DEBUG) {
            Answers.getInstance().logContentView(new ContentViewEvent().putContentName("LoginScreen"));
        }
        Log.i(TAG, "onCreate() after Answers");

        //isSecured = LockScreenTest.doesDeviceHaveSecuritySetup(LoginActivity.this);
        isSecured = true;
        doAutoLogin = Preferences.getAutologin(this);

        if (!isSecured) {
            doAutoLogin = false;
        }
        Log.i(TAG, "onCreate() doAutoLogin = " + String.valueOf(doAutoLogin));

        // Set up the login form.
        mEmailView = (TextInputEditText) findViewById(R.id.email);
        mEmailView.setOnEditorActionListener(new TextView.OnEditorActionListener() {
            @Override
            public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) {
                if (id == R.id.email || id == EditorInfo.IME_NULL) {
                    mPinView.requestFocus();
                    return true;
                }
                return false;
            }
        });

        mPinView = (TextInputEditText) findViewById(R.id.password);
        // Submit login by Enter
        mPinView.setOnEditorActionListener(new TextView.OnEditorActionListener() {
            @Override
            public boolean onEditorAction(TextView textView, int id, KeyEvent keyEvent) {
                if (id == R.id.login || id == EditorInfo.IME_NULL) {
                    attemptLogin();
                    return true;
                }
                return false;
            }
        });

        Button mEmailSignInButton = (Button) findViewById(R.id.email_sign_in_button);
        if (mEmailSignInButton != null) {
            mEmailSignInButton.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View view) {
                    attemptLogin();
                }
            });
        }

        TextView mHomepageView = (TextView) findViewById(R.id.action_homepage);
        if (mHomepageView != null) {
            mHomepageView.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View v) {
                    Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(getString(R.string.url_homepage)));
                    startActivity(browserIntent);
                }
            });
        }

        mLoginFormView = findViewById(R.id.login_form);
        mProgressView = findViewById(R.id.login_progress);
        mCheckboxView = (AppCompatCheckBox) findViewById(R.id.checkbox_remember_login);

        if (mCheckboxView != null) {
            mCheckboxView.setChecked(doAutoLogin);
            mCheckboxView.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
                @Override
                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                    //boolean isSecured = LockScreenTest.doesDeviceHaveSecuritySetup(LoginActivity.this);
                    if (isChecked) {
                        if (!isSecured) {
                            doAutoLogin = false;
                            mCheckboxView.setChecked(false);
                            Intent i = new Intent(LoginActivity.this, LockSettingsActivity.class);
                            startActivityForResult(i, 1);
                        } else {
                            doAutoLogin = true;
                        }
                    } else {
                        doAutoLogin = false;
                    }
                }
            });
        }

        if (isSecured && doAutoLogin) {
            attemptAutoLogin();
        } else if (BuildConfig.DEBUG) {
            mEmailView.setText("jiri.kveton+mVL_8@gmail.com");
            //mEmailView.setText("uzivatel@vema.cz");
            mPinView.setText("1111");
        }
    }

    private void attemptAutoLogin() {
        String userName = Preferences.getUsername(this);
        String userPass = Preferences.getPass(this);
        String userPassLegacy = Preferences.getPassLegacy(this);
        String userKey = Preferences.getKey(this);
        String userKeyLegacy = Preferences.getKeyLegacy(this);

        mEmailView.setText(userName);
        mPinView.setText(AUTOLOGIN_FAKE_PIN);

        if (!userName.equalsIgnoreCase("") && (!userPass.equalsIgnoreCase("") || !userPassLegacy.equalsIgnoreCase(""))
                && (!userKey.equalsIgnoreCase("") || !userKeyLegacy.equalsIgnoreCase(""))) {
            attemptLogin(userName, userPassLegacy, userPass, userKeyLegacy, userKey);
        } else {
            // If error occurred, disable auto-login feature to prevent login loop
            Preferences.putAutologin(this, false);
            Log.e(TAG, "Failed to autolog. Username or password is empty.");
        }
    }

    /**
     * Manually submitted login
     */
    private void attemptLogin() {
        try {
            final String email = mEmailView.getText().toString();
            final String pin = mPinView.getText().toString();
            String password;
            String passwordLegacy;
            String key;
            String keyLegacy;


            if (pin.equals(AUTOLOGIN_FAKE_PIN)){
                password = Preferences.getPass(this);
                passwordLegacy = Preferences.getPassLegacy(this);
                key = Preferences.getKey(this);
                keyLegacy = Preferences.getKeyLegacy(this);
            }else {
                passwordLegacy = AesUtils.pin2pass_compat(pin);
                password = AesUtils.pin2pass(pin);
                keyLegacy = AesUtils.pin2key_compat(pin);
                key = AesUtils.pin2key(pin);
            }
            if (isSecured && doAutoLogin && !email.equals("") && !password.equals("") && !key.equals("")) {
                Preferences.putUsername(this, email);
                Preferences.putPass(this, password);
                Preferences.putPassLegacy(this, passwordLegacy);
                Preferences.putKey(this, key);
                Preferences.putKeyLegacy(this, keyLegacy);
                Preferences.putAutologin(LoginActivity.this, doAutoLogin);
            }

            attemptLogin(email, passwordLegacy, password, keyLegacy, key);

        } catch (Exception e) {
            Toast.makeText(this, "Neočekávaná chyba při přihlášení.", Toast.LENGTH_LONG).show();
            e.printStackTrace();
            Crashlytics.logException(e);
        }
    }

    private void attemptLogin(final String email, final String passwordLegacy, final String password, final String keyLegacy, final String key) {
        Log.i(TAG, "attemptLogin()");
        if (mAuthTask != null) {
            return;
        }

        // Reset errors.
        mEmailView.setError(null);
        mPinView.setError(null);

        boolean cancel = false;
        View focusView = null;

        // Check for a valid password, if the user entered one.
        if (!TextUtils.isEmpty(password) && !isPasswordValid(password)) {
            mPinView.setError(getString(R.string.error_invalid_password));
            focusView = mPinView;
            cancel = true;
        }

        // Check for a valid email address.
        if (TextUtils.isEmpty(email)) {
            mEmailView.setError(getString(R.string.error_field_required));
            focusView = mEmailView;
            cancel = true;
        } else if (!isEmailValid(email)) {
            mEmailView.setError(getString(R.string.error_invalid_email));
            focusView = mEmailView;
            cancel = true;
        }

        if (cancel) {
            // There was an error; don't attempt login and focus the first
            // form field with an error.
            focusView.requestFocus();
        } else {
            // Show a progress spinner, and kick off a background task to
            // perform the user login attempt.
            showProgress(true);
            mAuthTask = true;



            loginHandler = new VmJswsResponseHandler() {
                @Override
                public void onFailure(int statusCode, Header[] headers, String responseString,
                                      Throwable throwable) {
                    mAuthTask = null;
                    showProgress(false);
                    doAutoLogin = false;
                    //Preferences.putAutologin(LoginActivity.this, false);
                    Toast.makeText(LoginActivity.this, R.string.msg_login_failed,
                            Toast.LENGTH_LONG).show();

                    Log.i(TAG, "Login failed! + " + responseString);

                    Preferences.putUsername(LoginActivity.this, "");
                    Preferences.putPass(LoginActivity.this, "");
                    Preferences.putPassLegacy(LoginActivity.this, "");
                    Preferences.putKey(LoginActivity.this, "");
                    Preferences.putKeyLegacy(LoginActivity.this, "");
                    Preferences.putAutologin(LoginActivity.this, false);

                    if (!BuildConfig.DEBUG) {
                        // Zalogovani nepovedeno loginu
                        Answers.getInstance().logContentView(new ContentViewEvent()
                                .putContentName("LoginScreen")
                                .putContentType("Failure")
                                .putCustomAttribute("email", email)
                        );
                    }
                }

                @Override
                public void onSuccess(int statusCode, Header[] headers, String responseString) {
                    mAuthTask = null;
                    showProgress(false);
                    Log.i(TAG, "Logged-in, starting MainActivity()");

                    if (LoginActivity.this.mCheckboxView.isChecked()) {
                        Preferences.putUsername(LoginActivity.this, email);
                        Preferences.putPass(LoginActivity.this, password);
                        Preferences.putPassLegacy(LoginActivity.this, passwordLegacy);
                        Preferences.putKey(LoginActivity.this, key);
                        Preferences.putKeyLegacy(LoginActivity.this, keyLegacy);
                        Preferences.putAutologin(LoginActivity.this, true);
                    }
                    else {
                        Preferences.putUsername(LoginActivity.this, "");
                        Preferences.putPass(LoginActivity.this, "");
                        Preferences.putPassLegacy(LoginActivity.this, "");
                        Preferences.putKey(LoginActivity.this, "");
                        Preferences.putKeyLegacy(LoginActivity.this, "");
                        Preferences.putAutologin(LoginActivity.this, false);
                    }

                    if (!BuildConfig.DEBUG) {
                        // Zalogovani povedeno loginu
                        Answers.getInstance().logContentView(new ContentViewEvent()
                                .putContentName("LoginScreen")
                                .putContentType("Success")
                                .putCustomAttribute("email", email)
                        );
                    }

                    Intent myIntent = new Intent(LoginActivity.this, MainActivity.class);
                    myIntent.putExtra(MainActivity.ARG_KEY, key);
                    myIntent.putExtra(MainActivity.ARG_KEY_LEGACY, keyLegacy);
                    myIntent.putExtra(MainActivity.ARG_EMAIL, email);
                    LoginActivity.this.startActivity(myIntent);
                    finish();
                }
            };

            final VmJswsResponseHandler firstAttemptHandler = new VmJswsResponseHandler() {
                @Override
                public void onFailure(int statusCode, Header[] headers, String responseString, Throwable throwable) {
                    loginHandler.onFailure(statusCode, headers, responseString, throwable);
                }

                @Override
                public void onSuccess(int statusCode, Header[] headers, String responseString) {
                    loginHandler.onSuccess(statusCode, headers, responseString);
                }
            };

            MVLRestClientFactory.getClient(LoginActivity.this).login(LoginActivity.this, email, password, new VmJswsResponseHandler() {
                @Override
                public void onFailure(int statusCode, Header[] headers, String responseString, Throwable throwable) {
                    // If failed, next attempt to login with buggy password
                    MVLRestClientFactory.getClient(LoginActivity.this).login(LoginActivity.this, email, passwordLegacy, firstAttemptHandler);
                }

                @Override
                public void onSuccess(int statusCode, Header[] headers, String responseString) {
                    loginHandler.onSuccess(statusCode, headers, responseString);
                }
            });
        }
    }

    private boolean isEmailValid(String email) {
        return email.contains("@");
    }

    private boolean isPasswordValid(String password) {
        return password.length() >= 4;
    }

    /**
     * Shows the progress UI and hides the login form.
     */
    @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR2)
    private void showProgress(final boolean show) {
        // On Honeycomb MR2 we have the ViewPropertyAnimator APIs, which allow
        // for very easy animations. If available, use these APIs to fade-in
        // the progress spinner.
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR2) {
            int shortAnimTime = getResources().getInteger(android.R.integer.config_shortAnimTime);

            mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
            mLoginFormView.animate().setDuration(shortAnimTime).alpha(
                    show ? 0 : 1).setListener(new AnimatorListenerAdapter() {
                @Override
                public void onAnimationEnd(Animator animation) {
                    mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
                }
            });

            mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
            mProgressView.animate().setDuration(shortAnimTime).alpha(
                    show ? 1 : 0).setListener(new AnimatorListenerAdapter() {
                @Override
                public void onAnimationEnd(Animator animation) {
                    mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
                }
            });
        } else {
            // The ViewPropertyAnimator APIs are not available, so simply show
            // and hide the relevant UI components.
            mProgressView.setVisibility(show ? View.VISIBLE : View.GONE);
            mLoginFormView.setVisibility(show ? View.GONE : View.VISIBLE);
        }
    }

}