SignInActivity.java

package com.nielyouri.pluff.ui.activities;

import android.app.ProgressDialog;
import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
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.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 com.nielyouri.pluff.R;
import com.nielyouri.pluff.model.Course;
import com.nielyouri.pluff.model.Day;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

public class SignInActivity
        extends AppCompatActivity
        implements View.OnClickListener {

    private static final String TAG = "SignInActivity";

    private FirebaseDatabase mDatabase = FirebaseDatabase.getInstance();

    private List<Day> mDays = new ArrayList<Day>();

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

        Button button = (Button) findViewById(R.id.signin_button);

        button.setOnClickListener(this);

        DatabaseReference reference = mDatabase.getReference();

        reference.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                mDays.clear();

                for (DataSnapshot day : dataSnapshot.getChildren()) {
                    Day day1 = day.getValue(Day.class);

                    for (DataSnapshot course : day.child("courses").getChildren()) {
                        day1.addCourse(course.getValue(Course.class));
                    }

                    mDays.add(day1);
                }

                Log.d(TAG, String.format("Amount of days: %d", mDays.size()));
            }

            @Override
            public void onCancelled(DatabaseError databaseError) {
                Log.w(TAG, "Stop fetching data");
            }
        });
    }

    @Override
    public void onClick(View v) {
        int id = v.getId();

        if (id == R.id.signin_button) {
            signIn();
        }
    }

    private void signIn() {
        final ProgressDialog progressDialog = new ProgressDialog(SignInActivity.this,
                R.style.Dialog);
        FirebaseAuth firebaseAuth = FirebaseAuth.getInstance();

        TextView email = (TextView) findViewById(R.id.signin_email);
        TextView password = (TextView) findViewById(R.id.signin_password);

        // Check if the two fields are not empty
        if (TextUtils.isEmpty(email.getText())
                || TextUtils.isEmpty(password.getText()))
        {
            Toast.makeText(SignInActivity.this, getString(R.string.signin_empty_fields), Toast.LENGTH_SHORT).show();

            return;
        }

        progressDialog.setIndeterminate(true);
        progressDialog.setMessage(getString(R.string.signin_dialog));

        firebaseAuth.signInWithEmailAndPassword(email.getText().toString(), password.getText().toString())
                .addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                    @Override
                    public void onComplete(@NonNull Task<AuthResult> task) {
                        if (task.isSuccessful()) {
                            progressDialog.show();

                            Intent intent = new Intent(SignInActivity.this, MainActivity.class);

                            intent.putExtra("days", (Serializable) mDays);

                            // Don't start the activity until we have days
                            if (mDays.size() > 0) {
                                startActivity(intent);
                            }

                            new android.os.Handler().postDelayed(
                                    new Runnable() {
                                        @Override
                                        public void run() {
                                            finish();

                                            progressDialog.dismiss();
                                        }
                                    }, 3000);
                        } else {
                            Toast.makeText(SignInActivity.this, getString(R.string.signin_error), Toast.LENGTH_SHORT).show();
                        }
                    }
                });
    }
}