package test.agenda;

import android.Manifest;
import android.app.Activity;
import android.app.ProgressDialog;
import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.Context;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.provider.ContactsContract;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import java.util.ArrayList;

import test.agenda.adapter.ContactAdapter;
import test.agenda.model.Contact;
import test.agenda.model.Phone;


/**
 * A simple {@link Fragment} subclass.
 * Activities that contain this fragment must implement the
 * {@link ContactFragment.OnFragmentInteractionListener} interface
 * to handle interaction events.
 * Use the {@link ContactFragment#newInstance} factory method to
 * create an instance of this fragment.
 */
public class ContactFragment extends Fragment {
    private static final int REQUEST_READ_CONTACTS = 444;
    private RecyclerView contacts;
    private Context context;
    private ProgressDialog pDialog;
    private OnFragmentInteractionListener mListener;
    private Handler updateBarHandler;

    public ContactFragment() {
        // Required empty public constructor
    }

    /**
     * Use this factory method to create a new instance of
     * this fragment using the provided parameters.
     *
     * @return A new instance of fragment ContactFragment.
     */
    public static ContactFragment newInstance() {
        ContactFragment fragment;
        fragment = new ContactFragment();
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        context = getContext();

        pDialog = new ProgressDialog(context);
        pDialog.setMessage(context.getString(R.string.message_notice_reading_contact));
        pDialog.setCancelable(false);
        pDialog.show();

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_contact, container, false);
        contacts = view.findViewById(R.id.contact_list);
        return view;
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        updateBarHandler = new Handler();
        loadContacts(getActivity());

    }

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
        if (context instanceof OnFragmentInteractionListener) {
            mListener = (OnFragmentInteractionListener) context;
        } else {
            Toast.makeText(context, "Contact Fragment Attach", Toast.LENGTH_LONG).show();
        }
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mListener = null;
    }

    /**
     * This interface must be implemented by activities that contain this
     * fragment to allow an interaction in this fragment to be communicated
     * to the activity and potentially other fragments contained in that
     * activity.
     * <p>
     * See the Android Training lesson <a href=
     * "http://developer.android.com/training/basics/fragments/communicating.html"
     * >Communicating with Other Fragments</a> for more information.
     */
    public interface OnFragmentInteractionListener {
        void onFragmentInteraction(Uri uri);
    }


    private boolean canRequestContacts() {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) {
            return true;
        }
        if (context.checkSelfPermission(android.Manifest.permission.READ_CONTACTS) == PackageManager.PERMISSION_GRANTED) {
            return true;
        }
        if (shouldShowRequestPermissionRationale(android.Manifest.permission.READ_CONTACTS)) {
            requestPermissions(new String[]{android.Manifest.permission.READ_CONTACTS}, REQUEST_READ_CONTACTS);
        } else {
            requestPermissions(new String[]{Manifest.permission.READ_CONTACTS}, REQUEST_READ_CONTACTS);
        }
        return false;
    }


    /**
     * Callback received when a permissions request has been completed.
     */
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        if (requestCode == REQUEST_READ_CONTACTS && grantResults.length == 1 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
            getContacts(getActivity());
        }
    }

    public void getContacts(Activity activity) {
        if (!canRequestContacts()) {
            return;
        }

        ArrayList<Contact> list = new ArrayList<>();
        int read = 0;
        Cursor cursor = null;
        Cursor pCur = null;
        try {
            ContentResolver cr = context.getContentResolver();
            cursor = cr.query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null);
            if (cursor == null || !cursor.moveToFirst()) {
                throw new Exception("Cursor is empty");
            }
            int total = cursor.getCount();
            while (cursor.moveToNext()) {
                if (read >= 5) {
                    break;
                }
                read++;
                this.onUpdateRead(read, total);
                Contact c = new Contact();
                String id = cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts._ID));
                c.setName(cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME)));
                c.setPicture(getPhotoUri(Long.valueOf(id)));

                if (Integer.parseInt(cursor.getString(cursor.getColumnIndex(ContactsContract.Contacts.HAS_PHONE_NUMBER))) < 1) {
                    continue;
                }
                pCur = cr.query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, ContactsContract.CommonDataKinds.Phone.CONTACT_ID + " = ?", new String[]{id}, null);
                if (pCur == null || !pCur.moveToFirst()) {
                    continue;
                }
                ArrayList<Phone> phones = new ArrayList<>();
                do {
                    Phone p = new Phone();
                    p.setNumber(pCur.getString(pCur.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER)));
                    p.setType(pCur.getString(pCur.getColumnIndex(ContactsContract.CommonDataKinds.Phone.LABEL)));
                    phones.add(p);
                } while (pCur.moveToNext());
                pCur.close();
                c.setPhones(phones);
                list.add(c);
            }
        } catch (Exception ex) {
            Toast.makeText(context, ex.getMessage(), Toast.LENGTH_SHORT).show();
        } finally {
            if (cursor != null && !cursor.isClosed()) {
                cursor.close();
            }
            if (pCur != null && !pCur.isClosed()) {
                pCur.close();
            }
            onCompletedRead(activity, list);
        }
    }

    private Uri getPhotoUri(long contactId) {
        Uri contactUri = ContentUris.withAppendedId(ContactsContract.Contacts.CONTENT_URI, contactId);
        return Uri.withAppendedPath(contactUri, ContactsContract.Contacts.Photo.CONTENT_DIRECTORY);
    }

    private void loadContacts(final Activity activity) {
        try {
            new Thread(new Runnable() {
                @Override
                public void run() {
                    getContacts(activity);
                }
            }).start();
        } catch (Exception ex) {
            Toast.makeText(context, ex.getMessage(), Toast.LENGTH_SHORT).show();
        }
    }


    private void onUpdateRead(final int read, final int total) {
        updateBarHandler.post(new Runnable() {
            public void run() {
                pDialog.setMessage("Reading contacts : " + read + "/" + total);
            }
        });
    }

    private void onCompletedRead(Activity activity, final ArrayList<Contact> list) {
        // ListView has to be updated using a ui thread
        activity.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                refreshContacts(list);
            }
        });

        updateBarHandler.postDelayed(new Runnable() {
            @Override
            public void run() {
                pDialog.cancel();
            }
        }, 500);
    }

    private void refreshContacts(ArrayList<Contact> list) {
        RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getActivity());
        ContactAdapter adapter = new ContactAdapter(list);
        contacts.setLayoutManager(layoutManager);
        contacts.setAdapter(adapter);
    }
}