package com.example.sanchez.worldgramproject;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.preference.PreferenceManager;


import android.util.Log;
import android.view.View;
import android.widget.Toast;

import com.example.sanchez.worldgramproject.Fragments.MainActivity;
import com.google.android.gms.auth.api.Auth;
import com.google.android.gms.auth.api.signin.GoogleSignIn;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInClient;
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.ApiException;

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.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.auth.GoogleAuthProvider;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentActivity;

/**
 * Created by Sanchez on 10.09.2016.
 */


public class Login extends Activity   {

    private static final String TAG = "LoginProcess";
    Intent UsernameIntent;
    Intent maps;
    SignInButton gsignInButton;
    private static final int RC_SIGN_IN = 1;
    DatabaseReference mRef;
    FirebaseAuth mAuth;
    FirebaseAuth.AuthStateListener mAuthListener;
    GoogleSignInOptions gso;
    GoogleSignInClient mGoogleSignInClient;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.welcomescreenlogin);

        UsernameIntent = new Intent(this, Username.class);
        maps = new Intent(Login.this, MainActivity.class);
        mRef = FirebaseDatabase.getInstance().getReference().child("Users");
        mAuth = FirebaseAuth.getInstance();
        PreferenceManager.getDefaultSharedPreferences(getApplicationContext()).edit().clear().apply();

        mAuthListener = new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();

                if (user == null) {
                    // User is signed out

                    return;
                } else {

                    mRef.child(user.getUid()).addListenerForSingleValueEvent(new ValueEventListener() {
                        @Override
                        public void onDataChange(DataSnapshot snapshot) {
                            if (snapshot.exists()) {

                                // TODO: handle the case where the data already exists
                                startActivity(maps);
                                finish();
                            }
                            else {

                                // User is signed in but no Username
                                UsernameIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                                startActivity(UsernameIntent);
                                finish();
                                // TODO: handle the case where the data does not yet exist


                            }
                        }

                        @Override
                        public void onCancelled(DatabaseError databaseError) {
                            Toast.makeText(Login.this, "Error", Toast.LENGTH_LONG).show();
                        }

                    });







                }
            }
        };

        mAuth.addAuthStateListener(mAuthListener);


        gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestIdToken(getString(R.string.default_web_client_id))
                .requestEmail()
                .build();



        mGoogleSignInClient = GoogleSignIn.getClient(this, gso);

        gsignInButton = findViewById(R.id.sib);

        gsignInButton.setColorScheme(SignInButton.COLOR_DARK); // wide button style
        gsignInButton.setOnClickListener(myhandler);


    }

    View.OnClickListener myhandler = new View.OnClickListener() {
        public void onClick(View v) {
           signIn();
        }

    };



    public void signIn() {

        Intent signInIntent = mGoogleSignInClient.getSignInIntent();
        startActivityForResult(signInIntent, RC_SIGN_IN);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        // Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
        if (requestCode == RC_SIGN_IN) {
            Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
            try {
                // Google Sign In was successful, authenticate with Firebase
                GoogleSignInAccount account = task.getResult(ApiException.class);
                firebaseAuthWithGoogle(account);
            } catch (ApiException e) {
                // Google Sign In failed, update UI appropriately
                Log.w(TAG, "Google sign in failed", e);
                Toast.makeText(this, "dont give up", Toast.LENGTH_SHORT).show();
                // ...
            }
        }

    }

    private void firebaseAuthWithGoogle(GoogleSignInAccount acct) {
        Log.d(TAG, "firebaseAuthWithGoogle:" + acct.getId());

        AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
        mAuth.signInWithCredential(credential)
                .addOnCompleteListener(this,new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        Log.d(TAG, "signInWithCredential:onComplete:" + task.isSuccessful());

                        // If sign in fails, display a message to the user. If sign in succeeds
                        // the auth state listener will be notified and logic to handle the
                        // signed in user can be handled in the listener.
                        if (!task.isSuccessful()) {
                            Log.w(TAG, "signInWithCredential", task.getException());
                            Toast.makeText(Login.this, "Authentication failed.",
                                    Toast.LENGTH_SHORT).show();
                        }


                        // ...
                    }
                });

    }


}