import java.util.HashSet;
import java.util.Set;

import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;

public class BluetoothFragment extends BaseFragment implements OnItemClickListener, OnClickListener {
    private int language = 0;
    private TextView textViewPairedDevices = null;
    private ListView listViewPairedDevices = null;
    private ArrayAdapter<String> adapterPairedDevices = null;
    private TextView textViewNewDevices = null;
    private ListView listViewNewDevices = null;
    private ArrayAdapter<String> adapterNewDevices = null;
    private Button buttonScan = null;
    private BluetoothBroadcastReceiver bluetoothBroadcastReceiver = null;
    private BluetoothAdapter bluetoothAdapter = null;
    private Set<BluetoothDevice> pairedDevices = null;
    private Set<String> newDevices = null;

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

        Bundle extras = this.getActivity().getIntent().getExtras();

        if(extras != null) {
            this.language = extras.getInt(Globals.KEY_LANGUAGE);
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.activity_bluetooth_fragment, container, false);
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        this.getActivity().setResult(Activity.RESULT_CANCELED);

        this.adapterPairedDevices = new ArrayAdapter<String>(this.getActivity(), R.layout.activity_bluetooth_fragment_device);
        this.adapterNewDevices = new ArrayAdapter<String>(this.getActivity(), R.layout.activity_bluetooth_fragment_device);

        this.textViewPairedDevices = (TextView) view.findViewById(R.id.bluetooth_textview_paired_devices);
        this.textViewNewDevices = (TextView) view.findViewById(R.id.bluetooth_textview_new_devices);
        this.listViewPairedDevices = (ListView) view.findViewById(R.id.bluetooth_listview_paired_devices);
        this.listViewPairedDevices.setAdapter(this.adapterPairedDevices);
        this.listViewPairedDevices.setOnItemClickListener(this);
        this.listViewNewDevices = (ListView) view.findViewById(R.id.bluetooth_listview_new_devices);
        this.listViewNewDevices.setAdapter(this.adapterNewDevices);
        this.listViewNewDevices.setOnItemClickListener(this);
        this.buttonScan = (Button) view.findViewById(R.id.bluetooth_button_scan);
        this.buttonScan.setOnClickListener(this);
    }

    @Override
    public void onResume() {
        super.onResume();

        this.init();

        if (this.bluetoothAdapter.getState() == BluetoothAdapter.STATE_OFF) {
            this.getActivity().finish();
        }
    }

    @Override
    public void onPause() {
        super.onPause();

        if (this.bluetoothAdapter != null) {
            this.bluetoothAdapter.cancelDiscovery();
        }

        this.getActivity().unregisterReceiver(this.bluetoothBroadcastReceiver);
    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        this.bluetoothAdapter.cancelDiscovery();

        String info = ((TextView) view).getText().toString();

        if (info != null) {
            String[] infos = info.split("\n");
            String name= infos[0];
            String address = infos[1];

            Intent intent = new Intent();
            intent.putExtra(Globals.EXTRA_DEVICE_NAME, name);
            intent.putExtra(Globals.EXTRA_DEVICE_ADDRESS, address);

            this.getActivity().setResult(Activity.RESULT_OK, intent);
            this.getActivity().finish();
        }
    }

    @Override
    public void onClick(View view) {
        switch(view.getId()) {
        case R.id.bluetooth_button_scan : {
            this.startDiscovery();
            this.buttonScan.setVisibility(View.GONE);
        } break;
        }
    }

    private void init() {
        this.initLanguage();

        this.bluetoothBroadcastReceiver = new BluetoothBroadcastReceiver();

        IntentFilter filter = new IntentFilter();
        filter.addAction(BluetoothDevice.ACTION_FOUND);
        filter.addAction(BluetoothAdapter.ACTION_STATE_CHANGED);
        filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);

        this.getActivity().registerReceiver(this.bluetoothBroadcastReceiver, filter);

        this.bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        this.newDevices = new HashSet<String>();
        this.pairedDevices = this.bluetoothAdapter.getBondedDevices();

        if(this.pairedDevices != null && !this.pairedDevices.isEmpty()) {
            this.textViewPairedDevices.setVisibility(View.VISIBLE);

            for(BluetoothDevice bluetoothDevice : this.pairedDevices) {
                this.adapterPairedDevices.add(bluetoothDevice.getName() + "\n" + bluetoothDevice.getAddress());
            }
        } else {
            this.adapterPairedDevices.add(this.getResources().getText(R.string.text_no_paired_devices).toString());
        }
    }

    private void initLanguage() {
        if(this.language == Globals.ENGLISH) {
            this.textViewPairedDevices.setText(this.getResources().getString(R.string.text_paired_devices));
            this.textViewNewDevices.setText(this.getResources().getString(R.string.text_new_devices));
            this.buttonScan.setText(this.getResources().getString(R.string.text_scan));
        } else if(this.language == Globals.GERMAN) {
            this.textViewPairedDevices.setText(this.getResources().getString(R.string.text_paired_devices_de));
            this.textViewNewDevices.setText(this.getResources().getString(R.string.text_new_devices_de));
            this.buttonScan.setText(this.getResources().getString(R.string.text_scan_de));
        } else if(this.language == Globals.CHINESE) {
            this.textViewPairedDevices.setText(this.getResources().getString(R.string.text_paired_devices_cn));
            this.textViewNewDevices.setText(this.getResources().getString(R.string.text_new_devices_cn));
            this.buttonScan.setText(this.getResources().getString(R.string.text_scan_cn));
        }
    }

    private void startDiscovery() {
        this.adapterNewDevices.clear();
        this.newDevices.clear();

        this.getActivity().setProgressBarIndeterminateVisibility(true);
        this.getActivity().setTitle(this.getStringScanning());
        this.textViewNewDevices.setVisibility(View.VISIBLE);

        if (this.bluetoothAdapter.isDiscovering()) {
            this.bluetoothAdapter.cancelDiscovery();
        }

        this.bluetoothAdapter.startDiscovery();
    }

    private String getStringScanning() {
        if(this.language == Globals.ENGLISH) {
            return this.getResources().getString(R.string.text_scanning);
        } else if(this.language == Globals.GERMAN) {
            return this.getResources().getString(R.string.text_scanning_de);
        } else if(this.language == Globals.CHINESE) {
            return this.getResources().getString(R.string.text_scanning_cn);
        } else {
            return this.getResources().getString(R.string.text_scanning);
        }
    }

    private String getStringSelect() {
        if(this.language == Globals.ENGLISH) {
            return this.getResources().getString(R.string.text_select_device);
        } else if(this.language == Globals.GERMAN) {
            return this.getResources().getString(R.string.text_select_device_de);
        } else if(this.language == Globals.CHINESE) {
            return this.getResources().getString(R.string.text_select_device_cn);
        } else {
            return this.getResources().getString(R.string.text_select_device);
        }
    }

    private String getStringNoDevices() {
        if(this.language == Globals.ENGLISH) {
            return this.getResources().getString(R.string.text_no_devices);
        } else if(this.language == Globals.GERMAN) {
            return this.getResources().getString(R.string.text_no_devices_de);
        } else if(this.language == Globals.CHINESE) {
            return this.getResources().getString(R.string.text_no_devices_cn);
        } else {
            return this.getResources().getString(R.string.text_no_devices);
        }
    }

    private class BluetoothBroadcastReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();

            if (action.equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {
                if (bluetoothAdapter.getState() == BluetoothAdapter.STATE_OFF) {
                    getActivity().finish();
                }
            } else if(action.equals(BluetoothAdapter.ACTION_DISCOVERY_FINISHED)){
                getActivity().setProgressBarIndeterminateVisibility(false);
                getActivity().setTitle(getStringSelect());

                if (newDevices.isEmpty()) {
                    adapterNewDevices.clear();
                    adapterNewDevices.add(getStringNoDevices());
                }

                buttonScan.setVisibility(View.VISIBLE);
            } else if(action.equals(BluetoothDevice.ACTION_FOUND)) {
                BluetoothDevice bluetoothDevice = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);

                if (bluetoothDevice != null) {
                    String address = bluetoothDevice.getAddress();

                    if (!newDevices.contains(address)) {
                        newDevices.add(address);
                        adapterNewDevices.add(bluetoothDevice.getName() + "\n" + bluetoothDevice.getAddress());
                    }
                } else {}
            }
        }
    };
}