package com.example.james.funtendance;

import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.GestureDetector;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.firebase.ui.auth.AuthUI;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.ChildEventListener;
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 java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private FirebaseDatabase mFirebaseDatabase;
    private DatabaseReference mUserDatabaseReference, mSubjectsDatabaseReference;
    private FirebaseAuth mFirebaseAuth;
    private FirebaseAuth.AuthStateListener mAuthStateListener;

    private RecyclerView mRecycler;
    private TeacherProfileAdapter adapter;
    private ArrayList<Subject> subjectList = new ArrayList<>();
    private FirebaseUser mUser;
    private ChildEventListener mChildEventListener;
    private ArrayList<Teacher> teacherList = new ArrayList<>();

    public static final int RC_SIGN_IN = 1;
    public static final String ANONYMOUS = "anonymous";
    private String mUsername, name, mail, imgURL;
    private FloatingActionButton fabAdd;
    private ImageView img;
    private TextView mtxtName, mtxtMail;
    private int count = 0;

    TextView text;

    @Override

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mFirebaseDatabase = FirebaseDatabase.getInstance();
        mRecycler = (RecyclerView) findViewById(R.id.recycler_view);
        mtxtMail = (TextView) findViewById(R.id.txtMail);
        mtxtName = (TextView) findViewById(R.id.txtName);
        fabAdd = (FloatingActionButton) findViewById(R.id.addFloatingBtn);
        mSubjectsDatabaseReference = mFirebaseDatabase.getReference().child("subjects");
        mUserDatabaseReference = mFirebaseDatabase.getReference().child("teachers");

        fabAdd.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent1 = new Intent(MainActivity.this, AddNewSubject.class);
                intent1.putExtra("mail", mail);
                startActivity(intent1);
            }
        });

        mRecycler.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
            GestureDetector detector = new GestureDetector(getApplicationContext(), new GestureDetector.SimpleOnGestureListener() {
                @Override
                public boolean onSingleTapUp(MotionEvent e) {
                    return true;
                }

                @Override
                public void onLongPress(MotionEvent e) {
                    super.onLongPress(e);
                }
            });

            @Override
            public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
                View child = rv.findChildViewUnder(e.getX(), e.getY());
                if (child != null && detector.onTouchEvent(e)) {
                    int pos = rv.getChildAdapterPosition(child);
                    Subject subject = subjectList.get(pos);
                    String inName, inCode, inDate, inRoom, inPass;
                    Intent intent = new Intent(MainActivity.this, OpenSubject.class);
                    intent.putExtra("name", subject.getSubName());
                    intent.putExtra("mail", mail);
                    intent.putExtra("code", subject.getSubCode());
                    intent.putExtra("day", subject.getSubSchedDay());
                    intent.putExtra("room", subject.getSubRoom());
                    intent.putExtra("pass", subject.getSubPass());
                    intent.putExtra("timeIn", subject.getSubTimeIn());
                    intent.putExtra("timeOut", subject.getSubTimeOut());
                    startActivity(intent);
                }
                return false;
            }

            @Override
            public void onTouchEvent(RecyclerView rv, MotionEvent e) {

            }

            @Override
            public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {

            }
        });

        mFirebaseAuth = FirebaseAuth.getInstance();

        attachDBReadListenerSubs();
        mAuthStateListener = new FirebaseAuth.AuthStateListener() {
            @Override
            public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                FirebaseUser user = firebaseAuth.getCurrentUser();
                if (user != null) {
                    mail = user.getEmail();
                    name = user.getDisplayName();
                    imgURL = user.getPhotoUrl().toString();
                    mtxtName.setText("Hi " + name + "!");
                    mtxtMail.setText(mail);
                    onSignedInInitialized(user.getDisplayName());
                    Teacher teacher = new Teacher(name);
                    mFirebaseDatabase.getReference("teachers").push().setValue(teacher);
                } else {
                    onSignedOutCleanup();
                    startActivityForResult(AuthUI.getInstance()
                                    .createSignInIntentBuilder()
                                    .setTheme(R.style.AppTheme)
                                    .setIsSmartLockEnabled(false)
                                    .setProviders(AuthUI.GOOGLE_PROVIDER)
                                    .build(),
                            RC_SIGN_IN);
                }

            }
        };

    }

    @Override
    protected void onPause() {
        super.onPause();
        if (mAuthStateListener != null) {
            mFirebaseAuth.removeAuthStateListener(mAuthStateListener);
        }
        //detachDatabaseReadListener();
        //mMessageAdapter.clear();
    }

    @Override
    protected void onResume() {
        super.onResume();
        mFirebaseAuth.addAuthStateListener(mAuthStateListener);
    }

    private void onSignedInInitialized(String username) {
        mUsername = username;
        //attachDBReadListener();
        //attachDatabaseReadListener();
        attachDBReadListenerTeachers();
    }

    private void onSignedOutCleanup() {
        mUsername = ANONYMOUS;
        //mMessageAdapter.clear();
    }

    public void setIntent(FirebaseUser user) {
        mUser = user;
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.menu, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.sign_out_menu:
                AuthUI.getInstance().signOut(this);
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

    private void attachDBReadListenerSubs() {
        if (mChildEventListener == null) {
            mChildEventListener = new ChildEventListener() {
                @Override
                public void onChildAdded(DataSnapshot dataSnapshot, String s) {
                    Subject subject = dataSnapshot.getValue(Subject.class);
                    if (subject.getTeacherMail().equals(mail))
                        subjectList.add(subject);
                    if (subjectList != null)
                        Toast.makeText(MainActivity.this, "No Subjects as of the Moment", Toast.LENGTH_SHORT).show();
                    adapter = new TeacherProfileAdapter(getParent(), subjectList);
                    mRecycler.setAdapter(adapter);
                    mRecycler.setLayoutManager(new LinearLayoutManager(getParent()));
                }

                @Override
                public void onChildChanged(DataSnapshot dataSnapshot, String s) {

                }

                @Override
                public void onChildRemoved(DataSnapshot dataSnapshot) {
                    Subject subject = dataSnapshot.getValue(Subject.class);
                    subjectList.add(subject);

                }

                @Override
                public void onChildMoved(DataSnapshot dataSnapshot, String s) {

                }

                @Override
                public void onCancelled(DatabaseError databaseError) {

                }
            };
            mSubjectsDatabaseReference.addChildEventListener(mChildEventListener);
        }
    }

    private void attachDBReadListenerTeachers() {
        if (mChildEventListener == null) {
            mChildEventListener = new ChildEventListener() {
                @Override
                public void onChildAdded(DataSnapshot dataSnapshot, String s) {
                    Teacher teacher = dataSnapshot.getValue(Teacher.class);
//                    if (teacher != null) {
//                        if (teacher.getEmail().equals(mail)) {
//                            teacherList.add(teacher);
//                            if (teacher != null) {
//                                Teacher teacher1 = new Teacher(name, mail, imgURL);
//                                mUserDatabaseReference.push().setValue(teacher1);
//                            }
//
//                        }
//                    }

                }

                @Override
                public void onChildChanged(DataSnapshot dataSnapshot, String s) {

                }

                @Override
                public void onChildRemoved(DataSnapshot dataSnapshot) {
                    Subject subject = dataSnapshot.getValue(Subject.class);
                    subjectList.add(subject);

                }

                @Override
                public void onChildMoved(DataSnapshot dataSnapshot, String s) {

                }

                @Override
                public void onCancelled(DatabaseError databaseError) {

                }
            };
            mUserDatabaseReference.addChildEventListener(mChildEventListener);
        }
    }

    private void detachDatabaseReadListener() {
        if (mChildEventListener != null) {
            mSubjectsDatabaseReference.removeEventListener(mChildEventListener);
            mChildEventListener = null;
        }
    }
}