/*
 * Southampton University Map App
 * Copyright (C) 2011  Christopher Baines
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package net.cbaines.suma;

import java.sql.SQLException;
import java.util.Collections;
import java.util.List;

import org.osmdroid.views.MapView;
import org.osmdroid.views.MapView.Projection;
import org.osmdroid.views.overlay.Overlay;

import android.content.Intent;
import android.content.SharedPreferences;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Point;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.MotionEvent;
import android.widget.Toast;

public class BusStopOverlay extends Overlay implements RouteColorConstants, Preferences {

	List<BusStop> busStops;

	private final Point mCurScreenCoords = new Point();
	private final Point mTouchScreenPoint = new Point();
	private final Point mItemPoint = new Point();

	private final Rect mRect = new Rect();

	private final Drawable marker;
	private final Drawable favMarker;

	private final Paint paint;

	private static final String TAG = "BusStopOverlay";

	private final MapActivity context;

	private float userScale = 1f;

	private boolean[] routes = new boolean[5];

	private boolean showIdentifiers;

	public BusStopOverlay(MapActivity context, List<BusStop> busStops) throws SQLException {
		super(context);

		this.context = context;

		marker = context.getResources().getDrawable(R.drawable.busstop);
		favMarker = context.getResources().getDrawable(R.drawable.busstop_fav);

		showIdentifiers = PreferenceManager.getDefaultSharedPreferences(context).getBoolean(SHOW_IDENTIFIERS,
				SHOW_IDENTIFIERS_ENABLED_BY_DEFAULT);

		paint = new Paint();
		paint.setStyle(Style.FILL);
		paint.setStrokeWidth(6);

		this.busStops = busStops;
	}

	void setRoutes(int route, boolean visible) {
		routes[route] = visible;
	}

	@Override
	public void draw(final Canvas canvas, final MapView mapView, final boolean shadow) {

		if (shadow) {
			return;
		}

		final float scale = mScale * userScale;

		final Projection pj = mapView.getProjection();

		final int markerWidth = (int) (marker.getIntrinsicWidth() * userScale);
		final int markerHeight = (int) (marker.getIntrinsicHeight() * userScale);

		mRect.set(0, 0, 0 + markerWidth, 0 + markerHeight);
		mRect.offset(-markerWidth / 2, -markerHeight);
		marker.setBounds(mRect);
		favMarker.setBounds(mRect);

		final SharedPreferences favouritesPreferences = context.getSharedPreferences(FAVOURITES_PREFERENCES, 0);

		/*
		 * Draw in backward cycle, so the items with the least index are on the
		 * front.
		 */

		for (int stopNum = 0; stopNum < busStops.size(); stopNum++) {
			BusStop stop = busStops.get(stopNum);

			pj.toMapPixels(stop.point, mCurScreenCoords);
			if (!pj.getBoundingBox().increaseByScale(1.2f).contains(stop.point)) {
				continue;
			}

			byte routeNum = 0;
			final byte stopRoutes = stop.routes;

			boolean drawing = false;

			if (stop.uniLink) {

				for (int i = 0; i < 5; i++) {
					if ((stopRoutes & (1 << i)) != 0) {
						routeNum++;
						if (routes[i]) {
							drawing = true;
						}
					}
				}

				if (!drawing)
					continue;

			}

			if (favouritesPreferences.getBoolean(stop.id, false)) {
				Overlay.drawAt(canvas, favMarker, mCurScreenCoords.x, mCurScreenCoords.y, false);
			} else {
				Overlay.drawAt(canvas, marker, mCurScreenCoords.x, mCurScreenCoords.y, false);
			}

			if (stop.uniLink) {

				int makersPlaced = 0;

				final float rectLeft = mCurScreenCoords.x + (8.8f * scale);
				final float rectRight = rectLeft + (int) (8 * scale);

				int yOfsetPerMarker = (int) (10 * scale);
				int markerYSize = (int) (8 * scale);

				if (routeNum == 5) {
					markerYSize = (int) (5 * scale);
					yOfsetPerMarker = (int) (7 * scale);
				} else if (routeNum == 4) {
					markerYSize = (int) (6.5f * scale);
					yOfsetPerMarker = (int) (8 * scale);
				}

				for (int i = 0; i < 5; i++) {
					if ((stopRoutes & (1 << i)) != 0) {

						if (i == 0) {
							paint.setColor(U1);
						} else if (i == 1) {
							paint.setColor(U1N);
						} else if (i == 2) {
							paint.setColor(U2);
						} else if (i == 3) {
							paint.setColor(U6);
						} else if (i == 4) {
							paint.setColor(U9);
						} else {
							Log.e(TAG, "Unknown route code");
						}

						canvas.drawRect(rectLeft, mCurScreenCoords.y
								+ ((yOfsetPerMarker * makersPlaced) - (45 * scale)), rectRight, mCurScreenCoords.y
								+ (yOfsetPerMarker * makersPlaced) - ((45 * scale) - markerYSize), paint);

						makersPlaced++;
					}
				}
			}
		}
	}

	@Override
	public boolean onSingleTapConfirmed(final MotionEvent event, final MapView mapView) {

		BusStop busStop = getSelectedItem(event, mapView);

		if (busStop == null) {
			// Log.v(TAG, "No busStop pressed");
			return false;
		} else {
			Log.i(TAG, "busStop Pressed " + busStop.id);

			String str = busStop.description;
			if (showIdentifiers) {
				str += " (" + busStop.id + ")";
			}
			str += "\n" + context.getResources().getString(R.string.map_activity_toast_help_message);
			context.makeToast(str, Toast.LENGTH_SHORT);

			return true;
		}
	}

	public boolean onDoubleTap(final MotionEvent event, final MapView mapView) {

		BusStop busStop = getSelectedItem(event, mapView);

		if (busStop == null) {
			// Log.v(TAG, "No busStop pressed");
			return false;
		} else {
			Log.i(TAG, "Pressed " + busStop.id);

			Uri uri = Uri.parse("http://id.southampton.ac.uk/bus-stop/" + busStop.id);

			Log.i(TAG, "Starting a activity for " + uri + " path " + uri.getPath());

			Intent busStopIntent = new Intent(Intent.ACTION_VIEW, uri);
			context.startActivity(busStopIntent);

			return true;
		}

	}

	@Override
	public boolean onLongPress(final MotionEvent event, final MapView mapView) {

		BusStop busStop = getSelectedItem(event, mapView);

		if (busStop == null) {
			// Log.v(TAG, "No busStop pressed");
			return false;
		} else {
			Log.i(TAG, "Pressed " + busStop.id);

			SharedPreferences favouritesPreferences = context.getSharedPreferences(FAVOURITES_PREFERENCES, 0);

			if (favouritesPreferences.getBoolean(busStop.id, false)) {
				favouritesPreferences.edit().remove(busStop.id).commit();

				context.makeToast(busStop.id + " removed from favourites", Toast.LENGTH_SHORT);

			} else {
				context.makeToast(busStop.id + " made a favourite", Toast.LENGTH_SHORT);

				favouritesPreferences.edit().putBoolean(busStop.id, true).commit();
			}

			Collections.sort(busStops,
					new POIFavouriteComparator(context.getSharedPreferences(FAVOURITES_PREFERENCES, 0)));

			mapView.invalidate();

			return true;
		}
	}

	private BusStop getSelectedItem(final MotionEvent event, final MapView mapView) {
		Log.i(TAG, "Getting selected item");

		final Projection pj = mapView.getProjection();
		final int eventX = (int) event.getX();
		final int eventY = (int) event.getY();

		/* These objects are created to avoid construct new ones every cycle. */
		pj.fromMapPixels(eventX, eventY, mTouchScreenPoint);

		for (int i = busStops.size() - 1; i >= 0; i--) {
			BusStop busStop = busStops.get(i);

			pj.toPixels(busStop.point, mItemPoint);

			if (marker.getBounds().contains(mTouchScreenPoint.x - mItemPoint.x, mTouchScreenPoint.y - mItemPoint.y)) {
				if (busStop.uniLink) {
					boolean drawing = false;
					for (int route = 0; route < 5; route++) {
						if ((busStop.routes & (1 << route)) != 0) {
							if (routes[route]) {
								drawing = true;
								break;
							}
						}
					}
					if (!drawing)
						continue;
				}

				return busStop;
			}
		}
		return null;
	}

	public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) {
		Log.i(TAG, "Got a favourites change in the BuildingNumOverlay for key " + key);

		Collections.sort(busStops, new POIFavouriteComparator(context.getSharedPreferences(FAVOURITES_PREFERENCES, 0)));
	}

}