package no.topi.fiken.display;

import android.app.ActionBar;
import android.app.Activity;
import android.app.ListActivity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothManager;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.Handler;
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.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.crashlytics.android.Crashlytics;
import io.fabric.sdk.android.Fabric;
import java.util.ArrayList;
import java.util.List;

import static java.lang.String.valueOf;
import static no.topi.fiken.display.DisplayService.IntentAction;
import static no.topi.fiken.display.DisplayService.IntentExtra;
import static no.topi.fiken.display.ExceptionHandler.EXCEPTION_HANDLER;

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

    // Stops scanning after 10 seconds.
    private static final long SCAN_PERIOD = 3 * 1000;

    private static final int REQUEST_ENABLE_BT = 1;

    private DisplayListAdapter displayList;
    private Handler handler;
    private BluetoothAdapter mBluetoothAdapter;
    private boolean mScanning;
    private DisplayService displayService;
    private String deviceToShow;

    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);
        }
        handler = new Handler();

        // Use this check to determine whether BLE is supported on the device.  Then you can
        // selectively disable BLE-related features.
        if (!getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
            Toast.makeText(this, R.string.ble_not_supported, Toast.LENGTH_SHORT).show();
            finish();
        }

        // Initializes a Bluetooth adapter.  For API level 18 and above, get a reference to
        // BluetoothAdapter through BluetoothManager.
        final BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE);
        mBluetoothAdapter = bluetoothManager.getAdapter();

        // Checks if Bluetooth is supported on the device.
        if (mBluetoothAdapter == null) {
            Toast.makeText(this, R.string.error_bluetooth_not_supported, Toast.LENGTH_SHORT).show();
            finish();
        }

        serviceConnection = new ServiceConnection() {

            @Override
            public void onServiceConnected(ComponentName componentName, IBinder service) {
                displayService = ((DisplayService.LocalBinder) service).getService();
                if (!displayService.initialize()) {
                    finish();
                }

                startScan();
            }

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

        Intent displayServiceIntent = new Intent(this, DefaultDisplayService.class);
        bindService(displayServiceIntent, serviceConnection, BIND_AUTO_CREATE);
    }

    @Override
    protected void onDestroy() {
        unbindService(serviceConnection);
    }

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

        super.onResume();

        // Ensures Bluetooth is enabled on the device.  If Bluetooth is not currently enabled,
        // fire an intent to display a dialog asking the user to grant permission to enable it.
        if (!mBluetoothAdapter.isEnabled()) {
            Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
        }

        registerReceiver(displayServiceBroadcastReceiver, IntentAction.ALL_FILTER);
    }

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

        super.onPause();
        stopScan();
        unregisterReceiver(displayServiceBroadcastReceiver);
    }

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

        // User chose not to enable Bluetooth.
        if (requestCode == REQUEST_ENABLE_BT && resultCode == Activity.RESULT_CANCELED) {
            finish();
            return;
        }

        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 (!mScanning) {
            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() {
        displayList = new DisplayListAdapter();
        setListAdapter(displayList);

        displayService.startScan();

        // Stops scanning after a pre-defined scan period.
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                displayService.stopScan();
                invalidateOptionsMenu();
            }
        }, SCAN_PERIOD);
    }

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

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

        DisplayService.DeviceInfo state = displayList.getDevice(position);

        if (!displayService.connect(state.address)) {
            Toast.makeText(this, "Could not connect to " + state.address, Toast.LENGTH_SHORT).show();
        } else {
            deviceToShow = state.address;
        }
    }

    private final BroadcastReceiver displayServiceBroadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(final Context context, final Intent intent) {
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    IntentAction action = IntentAction.valueOf(intent);

                    String deviceAddress = intent.getStringExtra(IntentExtra.DEVICE_ADDRESS.name());

                    if (action == IntentAction.DEVICE_UPDATE && deviceAddress != null) {
                        DisplayService.DeviceInfo device = displayList.getDevice(deviceAddress, true);

                        device.update(intent);

                        if (intent.hasExtra(IntentExtra.CONNECTED.name())) {
                            boolean connected = intent.getBooleanExtra(IntentExtra.CONNECTED.name(), false);

                            if (connected) {
                                if (deviceToShow != null && deviceToShow.equals(device.address)) {
                                    Log.i(TAG, "connected to " + deviceToShow);
                                    final Intent intent = new Intent(context, DisplayControlActivity.class);
                                    intent.putExtra(IntentExtra.DEVICE_ADDRESS.name(), device.address);
                                    intent.putExtra(IntentExtra.DEVICE_NAME.name(), device.name);
                                    startActivity(intent);
                                }
                            }
                        }
                        displayList.notifyDataSetChanged();
                    }

                    if (intent.hasExtra(IntentExtra.SCANNING.name())) {
                        mScanning = intent.getBooleanExtra(IntentExtra.SCANNING.name(), false);
                        invalidateOptionsMenu();
                    }
                }
            });
        }
    };

    static class ViewHolder {
        final TextView deviceName;
        final TextView deviceAddress;
        final TextView rssi;
        final TextView isDisplay;

        ViewHolder(TextView deviceName, TextView deviceAddress, TextView rssi, TextView isDisplay) {
            this.deviceName = deviceName;
            this.deviceAddress = deviceAddress;
            this.rssi = rssi;
            this.isDisplay = isDisplay;
        }
    }

    private class DisplayListAdapter extends BaseAdapter {
        private List<DisplayService.DeviceInfo> devices = new ArrayList<DisplayService.DeviceInfo>();
        private LayoutInflater inflater = MainActivity.this.getLayoutInflater();

        public DisplayService.DeviceInfo getDevice(int position) {
            return devices.get(position);
        }

        public DisplayService.DeviceInfo getDevice(String address, boolean create) {
            for (DisplayService.DeviceInfo device : devices) {
                if (device.address.equals(address)) {
                    return device;
                }
            }

            DisplayService.DeviceInfo deviceInfo = null;
            if (create) {
                deviceInfo = new DisplayService.DeviceInfo(address, 0);
                devices.add(deviceInfo);
            }
            return deviceInfo;
        }

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

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

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

        @Override
        public View getView(int i, View view, ViewGroup viewGroup) {
            ViewHolder viewHolder;

            if (view == null) {
                view = inflater.inflate(R.layout.listitem_device, null);
                viewHolder = new ViewHolder(
                        (TextView) view.findViewById(R.id.device_name),
                        (TextView) view.findViewById(R.id.device_address),
                        (TextView) view.findViewById(R.id.device_rssi),
                        (TextView) view.findViewById(R.id.device_isDisplay));
                view.setTag(viewHolder);
            } else {
                viewHolder = (ViewHolder) view.getTag();
            }

            DisplayService.DeviceInfo state = devices.get(i);
            if (state.name != null && state.name.length() > 0) {
                viewHolder.deviceName.setText(state.name);
            } else {
                viewHolder.deviceName.setText(R.string.unknown_device);
            }
            viewHolder.deviceAddress.setText(state.address);

            viewHolder.rssi.setText(getText(R.string.rssi) + ": " +
                    (state.rssi != 0 ? valueOf(state.rssi) : getText(R.string.rssi_unknown)));

            viewHolder.isDisplay.setText("Is display: " +
                    (state.isDisplay != null ? state.isDisplay : "unknown"));
            view.setClickable(state.isDisplay != null && state.isDisplay);

            return view;
        }
    }
}