package io.trygvis.soilmoisture;

import android.app.ActionBar;
import android.app.ListActivity;
import android.app.ProgressDialog;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.database.DataSetObservable;
import android.database.DataSetObserver;
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.Button;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

import com.crashlytics.android.Crashlytics;

import java.util.ArrayList;
import java.util.List;

import io.fabric.sdk.android.Fabric;
import io.trygvis.android.LocalBinder;
import io.trygvis.android.bt.BtActivitySupport;

import static io.trygvis.soilmoisture.ExceptionHandler.EXCEPTION_HANDLER;
import static io.trygvis.soilmoisture.SoilMoistureService.SoilMoistureListener;
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 final SoilMoistureListener serviceListener = new MySoilMoistureListener();
    private final MainActivity context = this;

    private DeviceListAdapter deviceList;
    private ServiceConnection serviceConnection;
    private SoilMoistureService soilMoistureService;
    private ProgressDialog initializing;
    private boolean ready;

    @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) {
                Log.i(TAG, "onServiceConnected");
                soilMoistureService = ((LocalBinder<SoilMoistureService>) service).getService();
                registerReceiver(serviceListener, SoilMoistureListener.INTENT_FILTER);
            }

            @Override
            public void onServiceDisconnected(ComponentName componentName) {
                Log.i(TAG, "onServiceDisconnected");
                soilMoistureService = null;
                stopScan();
            }
        };

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

        initializing = ProgressDialog.
                show(this, "Initializing", "Connecting to Bluetooth system.", true);

        setContentView(R.layout.main);
    }

    @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(serviceListener, SoilMoistureListener.INTENT_FILTER);
    }

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

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

    @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);

        MenuItem stop = menu.findItem(R.id.menu_stop);
        MenuItem scan = menu.findItem(R.id.menu_scan);
        MenuItem refresh = menu.findItem(R.id.menu_refresh);
        MenuItem showAll = menu.findItem(R.id.menu_show_all);
        MenuItem groupByDevice = menu.findItem(R.id.menu_group_by_device);

        if (ready) {
            if (!soilMoistureService.isScanning()) {
                stop.setVisible(false);
                scan.setVisible(true);
                refresh.setActionView(null);
            } else {
                stop.setVisible(true);
                scan.setVisible(false);
                refresh.setActionView(R.layout.actionbar_indeterminate_progress);
            }
            showAll.setChecked(deviceList.isShowAll());
            groupByDevice.setChecked(deviceList.isGroupByDevice());
        } else {
            stop.setVisible(false);
            scan.setVisible(true);
            refresh.setActionView(null);
            showAll.setVisible(false);
            groupByDevice.setVisible(false);
        }
        return true;
    }

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

        boolean consumed = true;
        switch (item.getItemId()) {
            case R.id.menu_scan:
                startScan();
                break;
            case R.id.menu_stop:
                stopScan();
                break;
            case R.id.menu_show_all:
                item.setChecked(!item.isChecked());
                deviceList.setShowAll(item.isChecked());
                break;
            case R.id.menu_group_by_device:
                item.setChecked(!item.isChecked());
                deviceList.setGroupByDevice(item.isChecked());
                break;
            default:
                consumed = super.onOptionsItemSelected(item);
        }
        return consumed;
    }

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

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

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

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

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

        DeviceItem(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.info = (TextView) view.findViewById(R.id.device_info);
            this.spinner = (ProgressBar) view.findViewById(R.id.device_spinner);
            this.connect = (Button) view.findViewById(R.id.button_connect);
        }
    }

    private class DeviceListAdapter implements ListAdapter {
        private final DataSetObservable dataSetObservable = new DataSetObservable();
        private List<SmDevice> devices = new ArrayList<>();
        private List<Object> current = new ArrayList<>();
        private LayoutInflater inflater = MainActivity.this.getLayoutInflater();

        private boolean groupByDevice = true;
        private boolean showAll = true;

        public void sort() {
            Log.i(TAG, "sort(), groupByDevice=" + groupByDevice + ", showAll=" + showAll);
            current = new ArrayList<>();

            List<SmDevice> usefulDevices = new ArrayList<>(devices.size());
            List<SmDevice> unusefulDevices = new ArrayList<>(devices.size());
            for (SmDevice d : devices) {
                (d.isUseful() ? usefulDevices : unusefulDevices).add(d);
            }
            List<SmSensor> monitors = new ArrayList<>();
            for (SmDevice d : devices) {
                monitors.addAll(d.getSensors());
            }

            if (groupByDevice) {
                current.addAll(usefulDevices);
                if (showAll) {
                    current.addAll(unusefulDevices);
                }
            } else {
                current.addAll(monitors);
            }
            dataSetObservable.notifyChanged();
        }

        public void notifyDataSetChanged() {
            dataSetObservable.notifyChanged();
        }

        public void setShowAll(boolean showAll) {
            if (showAll == this.showAll) {
                return;
            }

            this.showAll = showAll;
            sort();
        }

        public boolean isShowAll() {
            return showAll;
        }

        public void setGroupByDevice(boolean groupByDevice) {
            if (groupByDevice == this.groupByDevice) {
                return;
            }

            this.groupByDevice = groupByDevice;
            sort();
        }

        public boolean isGroupByDevice() {
            return groupByDevice;
        }

        // -----------------------------------------------------------------------
        // ListAdapter Implementation
        // -----------------------------------------------------------------------

        @Override
        public void registerDataSetObserver(DataSetObserver observer) {
            dataSetObservable.registerObserver(observer);
        }

        @Override
        public void unregisterDataSetObserver(DataSetObserver observer) {
            dataSetObservable.unregisterObserver(observer);
        }

        @Override
        public boolean areAllItemsEnabled() {
            return true;
        }

        @Override
        public boolean isEnabled(int position) {
            return true;
        }

        @Override
        public boolean hasStableIds() {
            return true;
        }

        @Override
        public int getItemViewType(int position) {
            Object o = current.get(position);

            if (o instanceof SmDevice) {
                return 0;
            } else if (o instanceof SmSensor) {
                return 1;
            }

            throw new RuntimeException("Unknown kind: " + o.getClass());
        }

        @Override
        public int getViewTypeCount() {
            return 2;
        }

        @Override
        public boolean isEmpty() {
            return current.isEmpty();
        }

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

        @Override
        public Object getItem(int position) {
            return current.get(position);
        }

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

        @Override
        public View getView(int position, View view, ViewGroup viewGroup) {
            Object o = current.get(position);

            if (o instanceof SmDevice) {
                return getSmDeviceView((SmDevice) o, view);
            } else if (o instanceof SmSensor) {
                return getSoilMonitorView((SmSensor) o, view);
            }

            throw new RuntimeException("Not implemented");
        }

        private View getSmDeviceView(SmDevice smDevice, View view) {

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

            if (smDevice.getName() != null) {
                item.deviceName.setText(smDevice.getName());
            } else {
                item.deviceName.setText(R.string.unknown_device);
            }
            item.deviceAddress.setText(smDevice.getBtDevice().getAddress());

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

            if (smDevice.isUseful()) {
                item.info.setText("number of sensors: " + smDevice.getSensors().size());
            } else {
                item.info.setText("");
            }

            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;
        }

        private View getSoilMonitorView(SmSensor smSensor, View view) {
            throw new RuntimeException("Not implemented");
        }
    }

    private class MySoilMoistureListener extends SoilMoistureListener {
        @Override
        public void onReady(boolean ok) {
            if (!ok) {
                Toast.makeText(context,
                        "Could not initialize services.",
                        Toast.LENGTH_SHORT).
                        show();

                finish();
            } else {
                ready = true;
                deviceList = new DeviceListAdapter();
                setListAdapter(deviceList);

                deviceList.notifyDataSetChanged();
                startScan();

                initializing.dismiss();
            }
        }

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

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

        @Override
        public void onNewDevice(String address) {
            SmDevice device = soilMoistureService.getDevice(address);
            deviceList.devices.add(device);
            deviceList.sort();
        }
    }
}