package pk.edu.pcsm.pcsm_auth;

import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;


public class LoginActivity extends AppCompatActivity {

    private static final String TAG = "LoginActivity";

    //Firebase
    private FirebaseAuth.AuthStateListener mAuthListener;


    // widgets
    private EditText mEmail, mPassword;
    private ProgressBar mProgressBar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        mEmail = (EditText) findViewById(R.id.email);
        mPassword = (EditText) findViewById(R.id.password);
        mProgressBar = (ProgressBar) findViewById(R.id.progressBar);

        setupFirebaseAuth();

        Button signIn = (Button) findViewById(R.id.email_sign_in_button);
        signIn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                //check if the fields are filled out
                if (!isEmpty(mEmail.getText().toString())
                        && !isEmpty(mPassword.getText().toString())) {
                    Log.d(TAG, "onClick: attempting to authenticate.");

                    showDialog();

	                FirebaseAuth.getInstance().signInWithEmailAndPassword(mEmail.getText().toString(), mPassword.getText().toString())
                            .addOnCompleteListener(new OnCompleteListener<AuthResult>() {
                                @Override
                                public void onComplete(@NonNull Task<AuthResult> task) {
                                    hideDialog();

                                    if (task.isSuccessful()) {
                                      Timber.d("onPasswordEntered: linkWithCredential:success");
                                      FirebaseUser user = task.getResult().getUser();
                                      if (user.isEmailVerified()) {
                                        Log.d(TAG, "onAuthStateChanged: signed_in: " + user.getUid());
                                        Toast.makeText(LoginActivity.this, "Authenticated with: " + user.getEmail(), Toast.LENGTH_SHORT).show();
                                        Intent intent = new Intent(mContext, MainActivity.class);
                                        startActivity(intent);
                                        finish();
                                      }
                                      else {
                                        Toast.makeText(LoginActivity.this, "Check Your Email Inbox for a Verification link", Toast.LENGTH_SHORT).show();
                                              FirebaseAuth.getInstance().signOut();
                                      }
                                    }
                                }
                            }).addOnFailureListener(new OnFailureListener() {
                        @Override
                        public void onFailure(@NonNull Exception e) {
                            Toast.makeText(LoginActivity.this, "Authentication Failed", Toast.LENGTH_SHORT).show();
                            hideDialog();
                        }
                    });

                } else {
                    Toast.makeText(LoginActivity.this, "You didn't fill in all the fields.", Toast.LENGTH_SHORT).show();
                }
            }
        });

        TextView register = (TextView) findViewById(R.id.link_register);
        register.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(LoginActivity.this, RegisterActivity.class);
                startActivity(intent);
            }
        });

        TextView resetPassword = (TextView) findViewById(R.id.forgot_password);
        resetPassword.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

            }
        });

        TextView resendEmailVerification = (TextView) findViewById(R.id.resend_verification_email);
        resendEmailVerification.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                ResendVerificationDialog dialog = new ResendVerificationDialog();
                dialog.show(getSupportFragmentManager(), "dialog_resend_email_verification");
            }
        });

        hideSoftKeyboard();

    }

    /**
     * Return true if the @param is null
     *
     * @param string
     * @return
     */
    private boolean isEmpty(String string) {
        return string.equals("");
    }


    private void showDialog() {
        mProgressBar.setVisibility(View.VISIBLE);

    }

    private void hideDialog() {
        if (mProgressBar.getVisibility() == View.VISIBLE) {
            mProgressBar.setVisibility(View.INVISIBLE);
        }
    }

    private void hideSoftKeyboard() {
        this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
    }

    /*
        ----------------------------- Firebase setup ---------------------------------
     */

    private void setupFirebaseAuth() {
        Log.d(TAG, "setupFirebaseAuth: started.");

        mAuthListener = new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                FirebaseUser user = firebaseAuth.getCurrentUser();
                if (user != null) {
                  Log.d(TAG, "onAuthStateChanged: signed_out: ");

                }else {
                    Log.d(TAG, "onAuthStateChanged: signed_out: ");

                }
            }
        };
    }

    @Override
    protected void onStart() {
        super.onStart();
        FirebaseAuth.getInstance().addAuthStateListener(mAuthListener);
    }

    @Override
    protected void onStop() {
        super.onStop();
        if (mAuthListener != null) {
            FirebaseAuth.getInstance().removeAuthStateListener(mAuthListener);
        }
    }
}