import android.app.Activity;
import android.content.Intent;
import android.nfc.Tag;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

import android.util.Log;
import android.util.Patterns;
import android.view.View;
import android.widget.EditText;
import android.widget.ProgressBar;
import android.widget.Toast;

import com.facebook.AccessToken;
import com.facebook.CallbackManager;
import com.facebook.FacebookCallback;
import com.facebook.FacebookException;
import com.facebook.FacebookSdk;
import com.facebook.login.LoginResult;
import com.facebook.login.widget.LoginButton;
import com.google.android.gms.auth.api.Auth;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.auth.api.signin.GoogleSignInResult;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.SignInButton;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.AuthCredential;
import com.google.firebase.auth.AuthResult;
import com.google.firebase.auth.FacebookAuthProvider;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.auth.GoogleAuthProvider;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    FirebaseAuth mAuth;
    EditText editTextEmail, editTextPassword;
    ProgressBar progressBar;
    SignInButton gbutton;
    private final static int RC_SIGN_IN = 2;
    GoogleApiClient mGoogleApiClient;
    FirebaseAuth.AuthStateListener mAuthListener;
    LoginButton loginButtonFb;
    CallbackManager callbackManager;

    private void signIn() {
        Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
        startActivityForResult(signInIntent, RC_SIGN_IN);
    }
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        callbackManager.onActivityResult(requestCode,resultCode,data);

        // Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
        if (requestCode == RC_SIGN_IN) {
            GoogleSignInResult result= Auth.GoogleSignInApi.getSignInResultFromIntent(data);
            if (result.isSuccess()){
                GoogleSignInAccount account = result.getSignInAccount();
                firebaseAuthWithGoogle(account);
            }else{
                Toast.makeText(MainActivity.this,"Auth went wrong",Toast.LENGTH_SHORT).show();
            }
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        FacebookSdk.sdkInitialize(getApplicationContext());
        setContentView(R.layout.activity_main);

        mAuth= FirebaseAuth.getInstance();
        callbackManager = CallbackManager.Factory.create();
        gbutton = findViewById(R.id.googleBtn);
        editTextEmail = findViewById(R.id.editTextEmail);
        editTextPassword = findViewById(R.id.editTextPassword);
        progressBar=findViewById(R.id.progressbar);

        findViewById(R.id.btnSignUp).setOnClickListener(this);
        findViewById(R.id.buttonRegister).setOnClickListener(this);

        gbutton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                signIn();
            }
        });

        loginButtonFb=(LoginButton) findViewById(R.id.btnfacebook);
        loginButtonFb.setReadPermissions("email", "public_profile");
        loginButtonFb.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
            @Override
            public void onSuccess(LoginResult loginResult) {
                handleFacebookAccessToken(loginResult.getAccessToken());
               // startActivity(new Intent(MainActivity.this,ProfileActivity.class));
            }

            @Override
            public void onCancel() {
                Toast.makeText(MainActivity.this, "sign in cancelled", Toast.LENGTH_LONG).show();

            }

            @Override
            public void onError(FacebookException error) {

                Toast.makeText(MainActivity.this, "FacebookException error oh nooo!", Toast.LENGTH_LONG).show();
            }
        });



        mAuthListener = new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                FirebaseUser user= firebaseAuth.getCurrentUser();
                if(AccessToken.getCurrentAccessToken() != null)
                    Toast.makeText(MainActivity.this,AccessToken.getCurrentAccessToken().getExpires().toString(),Toast.LENGTH_SHORT).show();


                if(user != null){
                    String email= user.getEmail();
                    Toast.makeText(MainActivity.this,"succeesassss",Toast.LENGTH_SHORT).show();
                }
            }
        };
        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)

                .requestIdToken(getString(R.string.default_web_client_id))
                .requestEmail()
                .build();



        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .enableAutoManage(this, new GoogleApiClient.OnConnectionFailedListener() {
                    @Override
                    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
                        Toast.makeText(MainActivity.this,"something went wrong",Toast.LENGTH_SHORT).show();
                    }
                })
                .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
                .build();

    }
    private void firebaseAuthWithGoogle(GoogleSignInAccount account) {
        AuthCredential credential = GoogleAuthProvider.getCredential(account.getIdToken(), null);
        mAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()) {
                            // Sign in success, update UI with the signed-in user's information
                            Log.d("TAG", "signInWithCredential:success");
                            FirebaseUser user = mAuth.getCurrentUser();
                            String googlemail= user.getEmail();
                            //    updateUI(user);
                            Intent intent = new Intent(MainActivity.this, ProfileActivity.class);
                            //so we dont go back to login activity
                            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                            startActivity(intent);
                        } else {
                            // If sign in fails, display a message to the user.
                            Log.w("TAG", "signInWithCredential:failure", task.getException());
                            Toast.makeText(MainActivity.this,"Auth Failed.",Toast.LENGTH_SHORT).show();
                            //     updateUI(null);
                        }

                        // ...
                    }
                });


    }
    @Override
    public void onStart() {
        super.onStart();
        // Check if user is signed in (non-null) and update UI accordingly.
        FirebaseUser currentUser = mAuth.getCurrentUser();
     //   updateUI(currentUser);
    }
    private void handleFacebookAccessToken(AccessToken token) {
      //  Log.d(TAG, "HandleFacebookAccessToken:"+token);

        AuthCredential credential = FacebookAuthProvider.getCredential(token.getToken());
        mAuth.signInWithCredential(credential)
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (!task.isSuccessful()) {
                            Toast.makeText(MainActivity.this,"Auth failed",Toast.LENGTH_LONG ).show();

                        }
                    }
                });
    }

    private void userLogin(){
        String email = editTextEmail.getText().toString().trim();
        String password = editTextPassword.getText().toString().trim();
        if(email.isEmpty()){
            editTextEmail.setError("Email is required");
            editTextEmail.requestFocus();
            return;
        }
        if(!Patterns.EMAIL_ADDRESS.matcher(email).matches()){
            editTextEmail.setError("Enter a valid Email Address");
            editTextEmail.requestFocus();
            return;
        }
        if(password.isEmpty()){
            editTextPassword.setError("Password is required");
            editTextPassword.requestFocus();
            return;
        }
        if(password.length()<6){
            editTextPassword.setError("Minimum length of password is 6 characters");
            editTextPassword.requestFocus();
            return;
        }
        progressBar.setVisibility(View.VISIBLE);


        mAuth.signInWithEmailAndPassword(email, password).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
            @Override
            public void onComplete(@NonNull Task<AuthResult> task) {
                progressBar.setVisibility(View.GONE);
                if(task.isSuccessful()){
                    FirebaseUser user = mAuth.getCurrentUser();
                    String useremail= user.getEmail().toString();

                    //start 3rd part auth and compare strings with database here using the email
                    /// call load  user information to compare firebase email to 3rd party email
                    Intent intent = new Intent(MainActivity.this, ProfileActivity.class);
                    //so we dont go back to login activity
                    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                    startActivity(intent);
                }else{
                    Toast.makeText(getApplicationContext(),task.getException().getMessage(),Toast.LENGTH_LONG).show();
                }
            }
        });
    }
    public void updateUI(FirebaseUser user){
       // String email = user.getEmail();
      //  Toast.makeText(MainActivity.this,email,Toast.LENGTH_SHORT).show();
        startActivity(new Intent(MainActivity.this,ProfileActivity.class));
    }

    @Override
    public void onClick(View view){
        switch (view.getId()){
            case R.id.btnSignUp:
                startActivity(new Intent(this, sign_up.class));
                break;
            case R.id.buttonRegister:
                userLogin();
                break;
        }
    }

}