Login

package com.bud.ohad.noticeboardeylon;

import android.Manifest;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.ScaleDrawable;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.text.InputType;
import android.text.method.PasswordTransformationMethod;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.Toast;

import com.google.android.gms.tasks.OnCompleteListener;
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;
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 java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.List;

public class Login extends Activity {
    private FirebaseAuth mAuth;
    Button btnLoggedIn;
    EditText etEmail, etPassword;
    Intent toEventList;
    CheckBox cbShowPassword;
    ProgressDialog dialog;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //starts alerts
        Job.scheduleJob(getApplicationContext());
        //dialog begins
        dialog=new ProgressDialog(this);
        dialog.setMessage("Authenticating please wait... \n\nIf this is taking too long check your internet connection");
        dialog.setCancelable(false);
        dialog.setInverseBackgroundForced(false);
        dialog.show();
        mAuth = FirebaseAuth.getInstance();
        btnLoggedIn = new Button(getApplicationContext());
        btnLoggedIn = findViewById(R.id.btnLoggedIn);
        cbShowPassword = findViewById(R.id.cbShowPassword);
        etEmail = new EditText(getApplicationContext());
        etEmail = (EditText) findViewById(R.id.etEmail);
        etPassword = new EditText(getApplicationContext());
        etPassword = (EditText) findViewById(R.id.etPassword);
       // register();

        btnLoggedIn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(dialog!=null){
                    dialog.show();
                }
                etEmail.setError(null);
                etPassword.setError(null);
                boolean error =false;
                //retrieves user entered details
                final String retreivedEmail = etEmail.getText().toString().trim();
                final String retreivedPassword = etPassword.getText().toString();
                //Checks mail validity offline
                if(!BroardFunctions.isEmailValid(retreivedEmail)){
                    etEmail.setError("Mail isn't valid");
                    error=true;

                }
                //checks for password
                if(retreivedPassword.equals("")){
                    etPassword.setError("Password cannot be empty");
                    error=true;
                }
                if(!error) {
                    /*
                     * no error has been found
                     */
                    final DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
                    rootRef.addListenerForSingleValueEvent(new ValueEventListener() {
                        @Override
                        public void onDataChange(DataSnapshot snapshot) {
                            mAuth = FirebaseAuth.getInstance();
                            signIn(mAuth, retreivedEmail, retreivedPassword);// commence sign in


                        }

                        @Override
                        public void onCancelled(DatabaseError databaseError) {
                            Toast.makeText(getApplicationContext(), "Access to firebase canceled!",
                                    Toast.LENGTH_LONG).show();
                            if (dialog != null) {
                                dialog.dismiss();
                            }
                        }
                    });
                }else{
                    if(dialog!=null) {
                        dialog.dismiss();
                    }
                    Toast.makeText(getApplicationContext(),"Invalid inputs",Toast.LENGTH_SHORT).show();
                }

            }
        });

        /*
        shows and hides password on toggle
         */
        cbShowPassword.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if(isChecked){
                    etPassword.setTransformationMethod(null);
                }else{
                    etPassword.setTransformationMethod(PasswordTransformationMethod.getInstance());
                }
            }
        });

    }

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

    /**
     *
     * @param mAuth Firebase auth
     * @param email the user entered email
     * @param password the user entered password
     */
    public void signIn(final FirebaseAuth mAuth, String email, String password) {
        mAuth.signInWithEmailAndPassword(email, password)
                .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("5", "signInWithEmail:success");
                            FirebaseUser user = mAuth.getCurrentUser();
                            Toast.makeText(getApplicationContext(), "Authentication Successful!",
                                    Toast.LENGTH_SHORT).show();
                            updateUI(user);//update ui
                        } else {
                            // If sign in fails, display a message to the user.
                            Log.w("5", "signInWithEmail:failure", task.getException());
                            Toast.makeText(getApplicationContext(), "Authentication failed.",
                                    Toast.LENGTH_SHORT).show();
                            updateUI(null);
                        }


                    }
                });
    }

    private void updateUI(final FirebaseUser user) {
        if (user == null) {
            if(dialog!=null){
                dialog.dismiss();
            }

        } else {
            final FirebaseDatabase database = FirebaseDatabase.getInstance();
            DatabaseReference ref = database.getReference();
            ref.child("Users").child(user.getUid()).addValueEventListener(new ValueEventListener() {
                @Override
                public void onDataChange(DataSnapshot dataSnapshot) {
                    ServerUser currUser = dataSnapshot.getValue(ServerUser.class);
                    Log.d("5", "Current user details: " + currUser.toString());
                    if(dialog!=null){
                        dialog.dismiss();
                    }
                    //move to all event activity
                    toEventList = new Intent(getApplicationContext(), AllEvents.class);
                    startActivity(toEventList);
                }

                @Override
                public void onCancelled(DatabaseError databaseError) {
                    System.out.println("The read failed: " + databaseError.getCode());
                    if(dialog!=null){
                        dialog.dismiss();
                    }
                }
            });
        }
    }


 /*   private void register(){
        mAuth.createUserWithEmailAndPassword("arel601@gmail.com", "arel1234")
                .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, "createUserWithEmail:success");
                            final FirebaseDatabase database = FirebaseDatabase.getInstance();
                            DatabaseReference ref1 = database.getReference();
                            FirebaseUser user = mAuth.getCurrentUser();
                            ref1.child("Users").child(user.getUid()).setValue(new ServerUser(user.getUid(),"Moshe","Smith",false,
                                    1));
                            updateUI(user);
                        } else {
                            // If sign in fails, display a message to the user.
                   //         Log.w(TAG, "createUserWithEmail:failure", task.getException());
                   //         Toast.makeText(EmailPasswordActivity.this, "Authentication failed.",
                     //               Toast.LENGTH_SHORT).show();
                            updateUI(null);
                        }

                        // ...
                    }
                });
    }
*/





    /**
     * overrides the back press fucntion
     */
    @Override
    public void onBackPressed() {
        Log.d("2","Back was pressed all events");
        //presents a dialog that asks if you would like to quit the application
        final AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(Login.this);
        alertDialogBuilder.setTitle("Are you sure you want to exit?");
        alertDialogBuilder
                .setCancelable(true)
                .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        //user want to quit
                        dialog.cancel();
                        Toast.makeText(getApplicationContext(),"Goodbye", Toast.LENGTH_LONG);
                        exit();//quit

                    }
                })
                .setNegativeButton("No, im not sure", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        //user doesn't want to quit

                    }
                });
        AlertDialog alertDialog = alertDialogBuilder.create();
        alertDialog.show();

    }

    /**
     * This function simply exits the application
     */

    private void exit(){
        Intent homeIntent = new Intent(Intent.ACTION_MAIN);
        homeIntent.addCategory( Intent.CATEGORY_HOME );
        homeIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(homeIntent);
    }
}