package com.omar.paypal.paymentservice.ui;

import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.widget.Button;
import android.widget.Toast;

import com.facebook.AccessToken;
import com.facebook.CallbackManager;
import com.facebook.FacebookCallback;
import com.facebook.FacebookException;
import com.facebook.login.LoginManager;
import com.facebook.login.LoginResult;
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.omar.paypal.paymentservice.R;

import java.util.Arrays;

import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;

public class LoginActivity extends AppCompatActivity {

    @BindView(R.id.fb_login)Button facebookLoginBtn;

    // [START declare_auth]
    private FirebaseAuth mAuth;
    // [END declare_auth]
    CallbackManager callbackManager;

    public String TAG = getClass().getSimpleName();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        ButterKnife.bind(this);

        // [START initialize_auth]
        // Initialize Firebase Auth
        mAuth = FirebaseAuth.getInstance();
        // [END initialize_auth]

        //initialize facebook callback
        callbackManager = CallbackManager.Factory.create();

    }

    // [START on_start_check_user]
    @Override
    public void onStart() {
        super.onStart();
        // Check if user is signed in (non-null) and update UI accordingly.
        FirebaseUser currentUser = mAuth.getCurrentUser();
        updateUI(currentUser);
    }
    // [END on_start_check_user]


    // [START updating UI with current user
    private void updateUI(FirebaseUser currentUser) {
        if(currentUser!=null){
            startActivity(new Intent(this,ProductsActivity.class));
            finish();
        }
    }
    // [END updating UI ]


    @OnClick(R.id.fb_login)
    public void setUpFacebookLoginButton() {
        LoginManager.getInstance().logInWithReadPermissions(this, Arrays.asList("email", "public_profile"));
        LoginManager.getInstance().registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
            @Override
            public void onSuccess(LoginResult loginResult) {
                handleFacebookAccessToken(loginResult.getAccessToken());
            }

            @Override
            public void onCancel() {

            }

            @Override
            public void onError(FacebookException error) {
                if(!isNetworkConnected()){
                    Snackbar.make(findViewById(android.R.id.content),"please check internet connection"
                            ,Snackbar.LENGTH_SHORT).show();
                }else{
                    Snackbar.make(findViewById(android.R.id.content),"unexpected error,please try again later"
                            ,Snackbar.LENGTH_SHORT).show();
                }
            }
        });
    }


    // [START auth_with_facebook]
    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()) {
                            // Sign in success, update UI with the signed-in user's information
                            Log.d(TAG, "signInWithCredential:success");
                            updateUI(mAuth.getCurrentUser());
                        } else {
                            // If sign in fails, display a message to the user.
                            Log.w(TAG, "signInWithCredential:failure", task.getException());
                            Toast.makeText(LoginActivity.this, "Authentication failed.",
                                    Toast.LENGTH_SHORT).show();
                        }

                    }
                });
    }
    // [END auth_with_facebook]


    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        // Pass the activity result back to the Facebook SDK
        callbackManager.onActivityResult(requestCode, resultCode, data);
    }


    /**
     * check internet connection
     *
     * @return
     */
    public boolean isNetworkConnected() {
        ConnectivityManager connectivityManager
                = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
        NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
        return activeNetworkInfo != null && activeNetworkInfo.isConnected();
    }


}