package com.mapbox.mapboxsdk.testapp.activity.annotation;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.content.res.ResourcesCompat;
import android.support.v4.view.MenuItemCompat;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;

import com.mapbox.mapboxsdk.annotations.Icon;
import com.mapbox.mapboxsdk.annotations.Marker;
import com.mapbox.mapboxsdk.annotations.MarkerOptions;
import com.mapbox.mapboxsdk.annotations.MarkerViewOptions;
import com.mapbox.mapboxsdk.geometry.LatLng;
import com.mapbox.mapboxsdk.maps.MapView;
import com.mapbox.mapboxsdk.maps.MapboxMap;
import com.mapbox.mapboxsdk.maps.OnMapReadyCallback;
import com.mapbox.mapboxsdk.testapp.R;
import com.mapbox.mapboxsdk.testapp.utils.GeoParseUtil;
import com.mapbox.mapboxsdk.testapp.utils.IconUtils;

import org.json.JSONException;

import java.io.IOException;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.Random;

import timber.log.Timber;

/**
 * Test activity showcasing adding a large amount of Markers or MarkerViews.
 */
public class BulkMarkerActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener {

  private MapboxMap mapboxMap;
  private MapView mapView;
  private boolean customMarkerView;
  private List<LatLng> locations;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_marker_bulk);

    mapView = (MapView) findViewById(R.id.mapView);
    mapView.onCreate(savedInstanceState);
    mapView.getMapAsync(new OnMapReadyCallback() {
      @Override
      public void onMapReady(@NonNull MapboxMap mapboxMap) {
        BulkMarkerActivity.this.mapboxMap = mapboxMap;
      }
    });

    final View fab = findViewById(R.id.fab);
    if (fab != null) {
      fab.setOnClickListener(new FabClickListener());
    }
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    ArrayAdapter<CharSequence> spinnerAdapter = ArrayAdapter.createFromResource(
      this, R.array.bulk_marker_list, android.R.layout.simple_spinner_item);
    spinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    getMenuInflater().inflate(R.menu.menu_bulk_marker, menu);
    MenuItem item = menu.findItem(R.id.spinner);
    Spinner spinner = (Spinner) MenuItemCompat.getActionView(item);
    spinner.setAdapter(spinnerAdapter);
    spinner.setOnItemSelectedListener(BulkMarkerActivity.this);
    return true;
  }

  @Override
  public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
    int amount = Integer.valueOf(getResources().getStringArray(R.array.bulk_marker_list)[position]);
    if (locations == null) {
      new LoadLocationTask(this, amount).execute();
    } else {
      showMarkers(amount);
    }
  }

  private void onLatLngListLoaded(List<LatLng> latLngs, int amount) {
    locations = latLngs;
    showMarkers(amount);
  }

  private void showMarkers(int amount) {
    mapboxMap.clear();

    if (locations.size() < amount) {
      amount = locations.size();
    }

    if (customMarkerView) {
      showViewMarkers(amount);
    } else {
      showGlMarkers(amount);
    }
  }

  private void showViewMarkers(int amount) {
    DecimalFormat formatter = new DecimalFormat("#.#####");
    Random random = new Random();
    int randomIndex;

    int color = ResourcesCompat.getColor(getResources(), R.color.redAccent, getTheme());
    Icon icon = IconUtils.drawableToIcon(this, R.drawable.ic_droppin, color);

    List<MarkerViewOptions> markerOptionsList = new ArrayList<>();
    for (int i = 0; i < amount; i++) {
      randomIndex = random.nextInt(locations.size());
      LatLng latLng = locations.get(randomIndex);
      MarkerViewOptions markerOptions = new MarkerViewOptions()
        .position(latLng)
        .icon(icon)
        .title(String.valueOf(i))
        .snippet(formatter.format(latLng.getLatitude()) + ", " + formatter.format(latLng.getLongitude()));
      markerOptionsList.add(markerOptions);
    }
    mapboxMap.addMarkerViews(markerOptionsList);
  }

  private void showGlMarkers(int amount) {
    List<MarkerOptions> markerOptionsList = new ArrayList<>();
    DecimalFormat formatter = new DecimalFormat("#.#####");
    Random random = new Random();
    int randomIndex;

    for (int i = 0; i < amount; i++) {
      randomIndex = random.nextInt(locations.size());
      LatLng latLng = locations.get(randomIndex);
      markerOptionsList.add(new MarkerOptions()
        .position(latLng)
        .title(String.valueOf(i))
        .snippet(formatter.format(latLng.getLatitude()) + ", " + formatter.format(latLng.getLongitude())));
    }

    mapboxMap.addMarkers(markerOptionsList);
  }

  @Override
  public void onNothingSelected(AdapterView<?> parent) {
    // nothing selected, nothing to do!
  }

  @Override
  protected void onStart() {
    super.onStart();
    mapView.onStart();
  }

  @Override
  protected void onResume() {
    super.onResume();
    mapView.onResume();
  }

  @Override
  protected void onPause() {
    super.onPause();
    mapView.onPause();
  }

  @Override
  protected void onStop() {
    super.onStop();
    mapView.onStop();
  }

  @Override
  protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    mapView.onSaveInstanceState(outState);
  }

  @Override
  protected void onDestroy() {
    super.onDestroy();
    mapView.onDestroy();
  }

  @Override
  public void onLowMemory() {
    super.onLowMemory();
    mapView.onLowMemory();
  }

  private class FabClickListener implements View.OnClickListener {

    private TextView viewCountView;

    @Override
    public void onClick(final View view) {
      if (mapboxMap != null) {
        customMarkerView = true;

        // remove fab
        view.animate().alpha(0).setListener(new AnimatorListenerAdapter() {
          @Override
          public void onAnimationEnd(Animator animation) {
            super.onAnimationEnd(animation);
            view.setVisibility(View.GONE);
          }
        }).start();

        // reload markers
        Spinner spinner = (Spinner) findViewById(R.id.spinner);
        if (spinner != null) {
          int amount = Integer.valueOf(
            getResources().getStringArray(R.array.bulk_marker_list)[spinner.getSelectedItemPosition()]);
          showMarkers(amount);
        }

        viewCountView = (TextView) findViewById(R.id.countView);

        mapView.addOnMapChangedListener(new MapView.OnMapChangedListener() {
          @Override
          public void onMapChanged(@MapView.MapChange int change) {
            if (change == MapView.REGION_IS_CHANGING || change == MapView.REGION_DID_CHANGE) {
              if (!mapboxMap.getMarkerViewManager().getMarkerViewAdapters().isEmpty()) {
                viewCountView.setText(String.format(Locale.getDefault(), "ViewCache size %d",
                  mapboxMap.getMarkerViewManager().getMarkerViewContainer().getChildCount()));
              }
            }
          }
        });

        mapboxMap.getMarkerViewManager().setOnMarkerViewClickListener(
          new MapboxMap.OnMarkerViewClickListener() {
            @Override
            public boolean onMarkerClick(
              @NonNull Marker marker, @NonNull View view, @NonNull MapboxMap.MarkerViewAdapter adapter) {
              Toast.makeText(
                BulkMarkerActivity.this,
                "Hello " + marker.getId(),
                Toast.LENGTH_SHORT).show();
              return false;
            }
          });
      }
    }
  }

  private static class LoadLocationTask extends AsyncTask<Void, Integer, List<LatLng>> {

    private BulkMarkerActivity activity;
    private ProgressDialog progressDialog;
    private int amount;

    private LoadLocationTask(BulkMarkerActivity activity, int amount) {
      this.amount = amount;
      this.activity = activity;
      progressDialog = ProgressDialog.show(activity, "Loading", "Fetching markers", false);
    }

    @Override
    protected List<LatLng> doInBackground(Void... params) {
      try {
        String json = GeoParseUtil.loadStringFromAssets(activity.getApplicationContext(), "points.geojson");
        return GeoParseUtil.parseGeoJsonCoordinates(json);
      } catch (IOException | JSONException exception) {
        Timber.e("Could not add markers,", exception);
        return null;
      }
    }

    @Override
    protected void onPostExecute(List<LatLng> locations) {
      super.onPostExecute(locations);
      activity.onLatLngListLoaded(locations, amount);
      progressDialog.hide();
    }
  }
}