package io.trygvis.soilmoisture;

import android.app.ActionBar;
import android.app.ListActivity;
import android.bluetooth.BluetoothGatt;
import android.bluetooth.BluetoothGattService;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;

import com.crashlytics.android.Crashlytics;

import io.fabric.sdk.android.Fabric;
import io.trygvis.android.bt.BtActionExecutor;
import io.trygvis.android.bt.BtActivitySupport;
import io.trygvis.android.bt.BtDevice;
import io.trygvis.android.bt.BtDeviceListener;
import io.trygvis.android.bt.BtService;
import io.trygvis.android.bt.DefaultBtService;
import io.trygvis.bluetooth.TrygvisIoUuids;

import static io.trygvis.android.bt.BtService.BtServiceListener;
import static io.trygvis.soilmoisture.ExceptionHandler.EXCEPTION_HANDLER;
import static java.lang.String.valueOf;

public class MainActivity extends ListActivity {
    private final static String TAG = MainActivity.class.getSimpleName();

    private static final long SCAN_PERIOD = 3 * 1000;

    private static final int REQUEST_ENABLE_BT = 1;

    private final BtActivitySupport btActivitySupport = new BtActivitySupport(this, REQUEST_ENABLE_BT);

    private DeviceListAdapter deviceList;
    private BtService<SmDevice> btService;

    private ServiceConnection serviceConnection;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        Log.i(TAG, "onCreate");
        Thread.setDefaultUncaughtExceptionHandler(EXCEPTION_HANDLER);
        super.onCreate(savedInstanceState);
        Fabric.with(this, new Crashlytics());

        ActionBar actionBar = getActionBar();
        if (actionBar != null) {
            actionBar.setTitle(R.string.title_devices);
        }

        if (!btActivitySupport.onCreate()) {
            finish();
            return;
        }

        serviceConnection = new ServiceConnection() {
            @SuppressWarnings("unchecked")
            @Override
            public void onServiceConnected(ComponentName componentName, IBinder service) {
                btService = ((BtService.LocalBinder<SmDevice>) service).getService();
                if (!btService.initialize(serviceListener, SmDevice::new)) {
                    finish();
                }

                deviceList = new DeviceListAdapter();
                deviceList.notifyDataSetChanged();
                setListAdapter(deviceList);

                startScan();
            }

            @Override
            public void onServiceDisconnected(ComponentName componentName) {
                btService = null;
                stopScan();
            }
        };

        bindService(new Intent(this, DefaultBtService.class), serviceConnection, BIND_AUTO_CREATE);
    }

    @Override
    protected void onDestroy() {
        Log.i(TAG, "onDestroy");
        super.onDestroy();

        if (serviceConnection != null) {
            unbindService(serviceConnection);
        }
    }

    @Override
    protected void onResume() {
        Log.i(TAG, "onResume");

        super.onResume();

        if (!btActivitySupport.enableBt()) {
            finish();
            return;
        }

        // registerReceiver(btServiceBroadcastReceiver, IntentAction.ALL_FILTER);
    }

    @Override
    protected void onPause() {
        Log.i(TAG, "onPause");

        super.onPause();
        stopScan();
        // unregisterReceiver(ntServiceBroadcastReceiver);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        Log.i(TAG, "onActivityResult");

        if (!btActivitySupport.onActivityResult(requestCode, resultCode, data)) {
            finish();
        }

        super.onActivityResult(requestCode, resultCode, data);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        Log.i(TAG, "onCreateOptionsMenu");
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);

        if (!btService.isScanning()) {
            menu.findItem(R.id.menu_stop).setVisible(false);
            menu.findItem(R.id.menu_scan).setVisible(true);
            menu.findItem(R.id.menu_refresh).setActionView(null);
        } else {
            menu.findItem(R.id.menu_stop).setVisible(true);
            menu.findItem(R.id.menu_scan).setVisible(false);
            menu.findItem(R.id.menu_refresh).setActionView(R.layout.actionbar_indeterminate_progress);
        }
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        Log.i(TAG, "onOptionsItemSelected");

        switch (item.getItemId()) {
            case R.id.menu_scan:
                startScan();
                break;
            case R.id.menu_stop:
                stopScan();
                break;
        }
        return super.onOptionsItemSelected(item);
    }

    private void startScan() {
        btService.startScanning(SCAN_PERIOD);
    }

    private void stopScan() {
        if (btService != null) {
            btService.stopScanning();
        }
    }

    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        stopScan();

        BtDevice<SmDevice> state = btService.getDevices().get(position);

        BtActionExecutor executor = new BtActionExecutor().
                onConnectionStateChange((gatt, newState) -> {
                    if (newState == BluetoothGatt.STATE_CONNECTED) {
                        Intent intent = new Intent(this, SoilActivity.class);
                        startActivity(intent);
                        return true;
                    }
                    return false;
                }).
                onServicesDiscovered(gatt -> false);

        state.connect(executor);
    }

    BtServiceListener<SmDevice> serviceListener = new BtServiceListener<SmDevice>() {
        @Override
        public void onScanStarted() {
            invalidateOptionsMenu();
        }

        @Override
        public void onNewDevice(BtDevice<SmDevice> device) {
            device.addListener(deviceListener);

            BtActionExecutor executor = new BtActionExecutor().
                    onConnectionStateChange((gatt, newState) -> gatt.discoverServices()).
                    onServicesDiscovered(gatt -> {
                        BluetoothGattService service = gatt.getService(TrygvisIoUuids.Services.SOIL_MOISTURE_SERVICE);

                        boolean useful = service != null;
                        device.getTag().setIsUseful(useful);
                        runOnUiThread(deviceList::notifyDataSetChanged);
                        return useful;
                    });
            device.connect(executor);
        }

        @Override
        public void onScanStopped() {
            invalidateOptionsMenu();
        }
    };

    BtDeviceListener deviceListener = new BtDeviceListener() {
    };

    // -----------------------------------------------------------------------
    //
    // -----------------------------------------------------------------------

    static class DeviceListItem {
        final TextView deviceName;
        final TextView deviceAddress;
        final TextView rssi;
        final ProgressBar spinner;
        final Button connect;

        DeviceListItem(View view) {
            this.deviceName = (TextView) view.findViewById(R.id.device_name);
            this.deviceAddress = (TextView) view.findViewById(R.id.device_address);
            this.rssi = (TextView) view.findViewById(R.id.device_rssi);
            this.spinner = (ProgressBar) view.findViewById(R.id.device_spinner);
            this.connect = (Button) view.findViewById(R.id.button_connect);
        }
    }

    private class DeviceListAdapter extends BaseAdapter {
        private LayoutInflater inflater = MainActivity.this.getLayoutInflater();

        @Override
        public int getCount() {
            return btService.getDevices().size();
        }

        @Override
        public Object getItem(int i) {
            return btService.getDevices().get(i);
        }

        @Override
        public long getItemId(int i) {
            return i;
        }

        @Override
        public View getView(int i, View view, ViewGroup viewGroup) {
            DeviceListItem item;

            if (view == null) {
                view = inflater.inflate(R.layout.listitem_device, null);
                item = new DeviceListItem(view);
                view.setTag(item);
                view.setClickable(false);
            } else {
                item = (DeviceListItem) view.getTag();
            }

            BtDevice<SmDevice> btDevice = btService.getDevices().get(i);
            if (btDevice.getName() != null && btDevice.getName().length() > 0) {
                item.deviceName.setText(btDevice.getName());
            } else {
                item.deviceName.setText(R.string.unknown_device);
            }
            item.deviceAddress.setText(btDevice.getAddress());

            item.rssi.setText(getText(R.string.rssi) + ": " +
                    (btDevice.getRssi() != 0 ? valueOf(btDevice.getRssi()) : getText(R.string.unknown)));

            SmDevice smDevice = btDevice.getTag();

            boolean useful = smDevice.isUseful();
            item.spinner.setVisibility(useful ? View.GONE : View.VISIBLE);
            item.connect.setVisibility(useful ? View.VISIBLE : View.GONE);
            view.setClickable(useful);

            return view;
        }
    }
}