package st.wow.git.ble;

import java.lang.String;
import java.util.List;
import java.util.UUID;
import android.app.Activity;
import android.app.Fragment;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattCharacteristic;
import android.bluetooth.BluetoothGattDescriptor;
import android.bluetooth.BluetoothGattService;
import android.bluetooth.BluetoothManager;
import android.bluetooth.le.ScanResult;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.Manifest;
import android.util.Log;

import com.welie.blessed.BluetoothCentral;
import com.welie.blessed.BluetoothCentralCallback;
import com.welie.blessed.BluetoothPeripheral;
import com.welie.blessed.BluetoothPeripheralCallback;

public class BlessedConnect extends Fragment {
	BluetoothCentral central;
	boolean wantScan = false;

	final int PERMISSION_REQUEST = 1;
	final int REQUEST_ENABLE_BT = 2;

	public BlessedConnect() {
		Log.d("gio", "BlessedConnect()");
	}

	@Override public void onAttach(Context ctx) {
		super.onAttach(ctx);
		Log.d("gio", "BlessedConnect: onAttach()");
		ctx.registerReceiver(receiver, new IntentFilter(BluetoothAdapter.ACTION_STATE_CHANGED));
		if (ctx.checkSelfPermission(Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                        requestPermissions(new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, PERMISSION_REQUEST);
                }
		central = new BluetoothCentral(ctx, centralCallback, null);
		installComplete(this);
	}

	private final BroadcastReceiver receiver = new BroadcastReceiver() {
		@Override
		public void onReceive(Context context, Intent intent) {
			Log.d("gio", "Received broadcast");
			if (intent.getAction().equals(BluetoothAdapter.ACTION_STATE_CHANGED)) {
				updateState(intent.getIntExtra(BluetoothAdapter.EXTRA_STATE, -1));
			}
		}
	};

	public boolean enabled() {
		Context ctx = getContext();
		//The Blessed library does not expose this functionality, so
		//we need to get our own BluetoothAdapter and check its status.
		BluetoothAdapter adapter = ((BluetoothManager)ctx.getSystemService(ctx.BLUETOOTH_SERVICE)).getAdapter();
		return (adapter != null && adapter.isEnabled());
	}

	@Override
	public void onDestroy() {
		Log.d("gio","onDestroy()");
		stopScan();
		getContext().unregisterReceiver(receiver);
		super.onDestroy();
	}

	public void scan() {
		if (enabled()) {
			central.scanForPeripherals();
		} else {
			wantScan = true;
		}
	}

	public void stopScan() {
		central.stopScan();
	}

	private final BluetoothCentralCallback centralCallback = new BluetoothCentralCallback() {
		@Override
		public void onDiscoveredPeripheral(BluetoothPeripheral peripheral, ScanResult scanResult) {
			Log.d("gio", "BlessedConnect: onDiscoveredPeripheral(): " + peripheral.getName());
			onScan(peripheral.getName(), peripheral.getAddress(), scanResult.getRssi(), peripheral);
		}

		@Override
		public void onConnectedPeripheral(BluetoothPeripheral peripheral) {
			Log.d("gio", "BlessedConnect: Connected to " + peripheral.getName());
			Log.d("gio", "BlessedConnect: Address = " + peripheral.getAddress());
			onConnect(peripheral, peripheral.getAddress());
		}

		@Override
		public void onConnectionFailed(BluetoothPeripheral peripheral, int status) {
			Log.d("gio", "BlessedConnect: onConnectionFailed()");
		}

		@Override
		public void onDisconnectedPeripheral(BluetoothPeripheral peripheral, int status) {
			Log.d("gio", "BlessedConnect: Disconnected");
		}

		@Override
		public void onScanFailed(int errorCode) {
			Log.d("gio", "BlessedConnect: Scan failed");
		}

	};

	private final BluetoothPeripheralCallback peripheralCallback = new BluetoothPeripheralCallback() {
		public void onBondingFailed(BluetoothPeripheral peripheral) {
			Log.d("gio", "BlessedConnect: onBondingFailed()");
		}
		public void onBondingStarted(BluetoothPeripheral peripheral) {
			Log.d("gio", "BlessedConnect: onBondingStarted()");
		}
		public void onBondingSucceeded(BluetoothPeripheral peripheral) {
			Log.d("gio", "BlessedConnect: onBondingSucceeded()");
		}
		public void onBondLost(BluetoothPeripheral peripheral) {
			Log.d("gio", "BlessedConnect: onBondLost()");
		}
		public void onCharacteristicUpdate(BluetoothPeripheral peripheral, byte[] value, BluetoothGattCharacteristic characteristic, int status) {
			Log.d("gio", "BlessedConnect: onCharacteristicUpdate()");
			characteristicChanged(peripheral.getAddress(), characteristic.getUuid().toString(), characteristic, value, value.length);
		}
		public void onCharacteristicWrite(BluetoothPeripheral peripheral, byte[] value, android.bluetooth.BluetoothGattCharacteristic characteristic, int status) {
			Log.d("gio", "onCharacteristicWrite(): " + characteristic.getUuid().toString());
		}
		public void onDescriptorRead(BluetoothPeripheral peripheral, byte[] value, android.bluetooth.BluetoothGattDescriptor descriptor, int status) {
			Log.d("gio", "onDescriptorRead()");
		}
		public void onDescriptorWrite(BluetoothPeripheral peripheral, byte[] value, android.bluetooth.BluetoothGattDescriptor descriptor, int status) {
			Log.d("gio", "onDescriptorWrite(): " + descriptor.getUuid().toString());
		}
		public void onMtuChanged(BluetoothPeripheral peripheral, int mtu, int status) {
			Log.d("gio", "onMtuChanged()");
		}
		public void onReadRemoteRssi(BluetoothGatt gatt, int rssi, int status) {
			Log.d("gio", "onReadRemoteRssi");
		}
		public void onNotificationStateUpdate(BluetoothPeripheral peripheral, BluetoothGattCharacteristic characteristic, int status) {
			if (status == BluetoothGatt.GATT_SUCCESS) {
				if(peripheral.isNotifying(characteristic)) {
					Log.i("gio", String.format("BlessedConnect: Notify set to 'on' for %s", characteristic.getUuid()));
				} else {
					Log.i("gio", String.format("BlessedConnect: Notify set to 'off' for %s", characteristic.getUuid()));
				}
			} else {
				Log.d("gio", "BlessedConnect: onNotificationStateUpdate(): failed");
			}
		}
		public void onServicesDiscovered(BluetoothPeripheral peripheral) {
			Log.d("gio", "BlessedConnect: onServicesDiscovered()");
		}
	};

	public void connect(BluetoothPeripheral peripheral) {
		if (peripheral == null) {
			return;
		}
		Log.d("gio","BlessedConnect: connect");
		central.connectPeripheral(peripheral, peripheralCallback);
	}

	public void disconnect(BluetoothPeripheral peripheral) {
		if (peripheral == null) {
			return;
		}
		Log.d("gio","BlessedConnect: disconnect");
		peripheral.cancelConnection();
	}

	public void discoverServices(BluetoothPeripheral peripheral) {
		if (peripheral == null) {
			return;
		}
		List<BluetoothGattService> services = peripheral.getServices();
		for (BluetoothGattService serv : services) {
			onDiscoverService(peripheral.getAddress(), serv.getUuid().toString(), serv);
		}
	}

	public void discoverCharacteristics(BluetoothPeripheral peripheral, BluetoothGattService serv) {
		if (peripheral == null || serv == null) {
			return;
		}
		List<BluetoothGattCharacteristic> chrs = serv.getCharacteristics();
		for (BluetoothGattCharacteristic chr : chrs) {
			onDiscoverCharacteristic(peripheral.getAddress(), serv.getUuid().toString(), serv, chr.getUuid().toString(), chr);
		}
	}

	public void readCharacteristic(BluetoothPeripheral peripheral, BluetoothGattCharacteristic chr) {
		if (peripheral == null || chr == null) {
			return;
		}
		peripheral.readCharacteristic(chr);
	}
	public boolean setCharacteristicNotification(BluetoothPeripheral peripheral, BluetoothGattCharacteristic chr) {
		if (peripheral == null || chr == null) {
			return false;
		}
		return peripheral.setNotify(chr, true);
	}

	@Override public void onActivityResult(int requestCode, int resultCode, Intent data) {
		Log.d("gio", "BlessedConnect: onActivityResult()");
		if (requestCode == REQUEST_ENABLE_BT) {
			Log.d("gio", "BlessedConnect: onActivityResult() REQUEST_ENABLE_BT");
			switch (resultCode) {
				case Activity.RESULT_OK: {
					Log.d("gio", "BlessedConnect: onActivityResult() -- OK");
					if (wantScan) {
						scan();
					}
					break;
				}
				case Activity.RESULT_CANCELED: {
					Log.d("gio", "BlessedConnect: onActivityResult() -- Cancelled");
					break;
				}
			}
		}
	}

	@Override
	public void onRequestPermissionsResult (int requestCode, String[] permissions, int[] grantResults) {
		Log.d("gio", "BlessedConnect: onRequestPermissionsResult");
		if (requestCode == PERMISSION_REQUEST) {
			boolean granted = true;
			for (int x : grantResults) {
				if (x == PackageManager.PERMISSION_DENIED) {
					granted = false;
					break;
				}
			}
			if (!granted) {
				Log.d("gio", "BlessedConnect: permissions not granted");
				return;
			}
			Log.d("gio", "BlessedConnect: permissions granted");
			if (wantScan) {
				scan();
			}
		}
	}

	static private native void installComplete(BlessedConnect p);

	static private native void updateState(int s);
	static private native void onScan(String name, String id, int rssi, BluetoothPeripheral peripheral);
	static private native void onConnect(BluetoothPeripheral peripheral, String id);
	static private native void onDiscoverService(String id, String uuid, BluetoothGattService serv);
	static private native void onDiscoverCharacteristic(String id, String suuid, BluetoothGattService serv, String cuuid, BluetoothGattCharacteristic chr);
	static private native void characteristicChanged(String id, String cuuid, BluetoothGattCharacteristic chr, byte[] value, int length);
}