package no.topi.fiken.display;

import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattCallback;
import android.bluetooth.BluetoothGattCharacteristic;
import android.bluetooth.BluetoothGattDescriptor;
import android.util.Log;

import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.List;
import java.util.Queue;

class BtActionExecutor {
    private final static String TAG = BtActionExecutor.class.getSimpleName();
    Queue<BtCallback> actions = new ArrayDeque<BtCallback>();
    Queue<BtCallback> fallbackActions = new ArrayDeque<BtCallback>();
    private final Runnable disconnect;
    List<BluetoothGattCallback> remoteRssi = new ArrayList<BluetoothGattCallback>();

    BtActionExecutor(Runnable disconnect) {
        this.disconnect = disconnect;
    }

    public static final BtCallback waitForIt = new BtCallback("Wait for it") {
        @Override
        public boolean onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) {
            Log.w(TAG, "wait for it...!");
            return true;
        }
    };

    public synchronized BtActionExecutor onSuccess(BtCallback btCallback) {
        actions.add(btCallback);
        return this;
    }

    public synchronized BtActionExecutor addFallback(BtCallback btCallback) {
        fallbackActions.add(btCallback);
        return this;
    }

    public synchronized BtActionExecutor onRemoteRssi(BluetoothGattCallback callback) {
        remoteRssi.add(callback);
        return this;
    }

    public void onEvent(String key, String values, BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, BluetoothGattDescriptor descriptor, int status, int newState) {
        if (status != BluetoothGatt.GATT_SUCCESS) {
            Log.w(TAG, "Operation failed: " + key + ", " + values);
            return;
        }

        Log.i(TAG, "Bt action completed successfully: callback=" + key);

        BtCallback btCallback;
        synchronized (this) {
            if (actions.isEmpty()) {
                Log.d(TAG, "All Bluetooth actions are done");

                for (BtCallback callback = fallbackActions.poll(); callback != null; callback = fallbackActions.poll()) {
                    try {
                        callCallback(key, gatt, characteristic, descriptor, newState, callback);
                    } catch (NotOverriddenException e) {
                        return;
                    }
                }

                return;
            }

            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                // ignore
            }
            btCallback = actions.remove();
            Log.i(TAG, "Executing bt action: " + btCallback.name);
        }

        boolean ok;

        try {
            ok = callCallback(key, gatt, characteristic, descriptor, newState, btCallback);
        } catch (NotOverriddenException e) {
            Log.w(TAG, "Unexpected callback by listener: " + key);
            disconnect.run();
            return;
        }

        if (!ok) {
            Log.w(TAG, "Error performing Bluetooth action.");
            disconnect.run();
        }
    }

    private Boolean callCallback(String key, BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, BluetoothGattDescriptor descriptor, int newState, BtCallback btCallback) {
        if (key.equals("onConnectionStateChange")) {
            return btCallback.onConnectionStateChange(gatt, newState);
        } else if (key.equals("onServicesDiscovered")) {
            return btCallback.onServicesDiscovered(gatt);
        } else if (key.equals("onCharacteristicRead")) {
            return btCallback.onCharacteristicRead(gatt, characteristic);
        } else if (key.equals("onCharacteristicWrite")) {
            return btCallback.onCharacteristicWrite(gatt, characteristic);
        } else if (key.equals("onCharacteristicChanged")) {
            return btCallback.onCharacteristicChanged(gatt, characteristic);
        } else if (key.equals("onDescriptorRead")) {
            return btCallback.onDescriptorRead(gatt, descriptor);
        } else if (key.equals("onDescriptorWrite")) {
            return btCallback.onDescriptorWrite(gatt, descriptor);
        } else if (key.equals("onReliableWriteCompleted")) {
            return btCallback.onReliableWriteCompleted(gatt);
        }

        Log.w(TAG, "Unknown callback: " + key);
        return null;
    }

    public BluetoothGattCallback asCallback() {
        return new BluetoothGattCallback() {

            @Override
            public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
                onEvent("onConnectionStateChange", "status=" + status + ", newState=" + newState, gatt, null, null, status, newState);
            }

            @Override
            public void onServicesDiscovered(BluetoothGatt gatt, int status) {
                onEvent("onServicesDiscovered", "status=" + status, gatt, null, null, status, 9);
            }

            @Override
            public void onCharacteristicRead(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
                onEvent("onCharacteristicRead", "status=" + status + ", characteristic=" + characteristic.getUuid(), gatt, characteristic, null, status, 0);
            }

            @Override
            public void onCharacteristicWrite(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic, int status) {
                onEvent("onCharacteristicWrite", "status=" + status + ", characteristic=" + characteristic.getUuid(), gatt, characteristic, null, status, 0);
            }

            @Override
            public void onCharacteristicChanged(BluetoothGatt gatt, BluetoothGattCharacteristic characteristic) {
                onEvent("onCharacteristicChanged", "characteristic=" + characteristic.getUuid(), gatt, characteristic, null, BluetoothGatt.GATT_SUCCESS, 0);
            }

            @Override
            public void onDescriptorRead(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) {
                onEvent("onDescriptorRead", "status=" + status + ", descriptor=" + descriptor.getUuid(), gatt, null, descriptor, status, 0);
            }

            @Override
            public void onDescriptorWrite(BluetoothGatt gatt, BluetoothGattDescriptor descriptor, int status) {
                onEvent("onDescriptorWrite", "status=" + status + ", descriptor=" + descriptor.getUuid(), gatt, null, descriptor, status, 0);
            }

            @Override
            public void onReliableWriteCompleted(BluetoothGatt gatt, int status) {
                onEvent("onReliableWriteCompleted", "status=" + status, gatt, null, null, status, 0);
            }

            @Override
            public void onReadRemoteRssi(BluetoothGatt gatt, int rssi, int status) {
                for (BluetoothGattCallback callback : remoteRssi) {
                    callback.onReadRemoteRssi(gatt, rssi, status);
                }
            }
        };
    }
}