package org.simantics.maps.sg;

import java.awt.Color;
import java.awt.Composite;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;

import org.simantics.g2d.participant.MouseUtil;
import org.simantics.g2d.participant.MouseUtil.MouseInfo;
import org.simantics.maps.elevation.server.SingletonTiffTileInterface;
import org.simantics.maps.sg.Formatting.FormatMode;

public class MapLocationInfoNode extends MapInfoNode {

    private static final long serialVersionUID = 7994492218791569147L;

    private static final transient int    MAX_DIGITS = 7;
    private static final transient int    MAX_Z_DECIMALS = 2;
    private static final transient double TRIM_THRESHOLD_MAX_VALUE = Math.pow(10, 4);
    private static final transient double TEXT_RIGHT_MARGIN = 20;

    private MouseUtil mouse;

    @Override
    public void render(Graphics2D g2d) {
        if (!enabled || mouse == null)
            return;

        AffineTransform ot = g2d.getTransform();
        g2d.setTransform(new AffineTransform());

        Rectangle2D bounds = g2d.getClipBounds();
        if (bounds == null)
            return; // FIXME

        MouseInfo mouseInfo = mouse.getMouseInfo(0);

        double startLat;
        double startLon;
        if (mouseInfo != null && mouseInfo.canvasPosition != null) {
            Point2D canvasPosition = mouseInfo.canvasPosition;
            double cx = canvasPosition.getX();
            double cy = canvasPosition.getY();
            startLat = yToLatitude(-cy / transform.getScaleY());
            startLon = xToLongitude(cx / transform.getScaleX());
        } else {
            startLat = 0;
            startLon = 0;
        }

        Number z = SingletonTiffTileInterface.lookup(startLat, startLon);

        String str = "X: " + Formatting.formatValue(startLon, MAX_DIGITS, false, FormatMode.LIMIT_DIGITS, TRIM_THRESHOLD_MAX_VALUE) +
                "   Y: " + Formatting.formatValue(startLat, MAX_DIGITS, false, FormatMode.LIMIT_DIGITS, TRIM_THRESHOLD_MAX_VALUE) +
                "   Z: " + Formatting.formatValue(z.doubleValue(), MAX_Z_DECIMALS, false, FormatMode.LIMIT_DECIMALS, TRIM_THRESHOLD_MAX_VALUE);

        Font font = MapInfoConstants.getInfoFont();
        g2d.setFont(font);
        FontMetrics fm = g2d.getFontMetrics();

        Rectangle2D r = fm.getStringBounds(str, g2d);

        double yOffsetFromBottom = getMapInfoNextY(g2d);
        double frameMaxY = bounds.getMaxY() - yOffsetFromBottom;
        double frameMinY = frameMaxY - font.getSize() - 2 * MapInfoConstants.TEXT_VERTICAL_MARGIN;
        double frameWidth = r.getWidth() + MapInfoConstants.TEXT_HORIZONTAL_MARGIN * 2;
        double frameMaxX = bounds.getMaxX() - TEXT_RIGHT_MARGIN;
        double frameMinX = frameMaxX - frameWidth;
        double textY = frameMinY + MapInfoConstants.TEXT_VERTICAL_MARGIN + fm.getMaxAscent();

        Composite oc = g2d.getComposite();
        g2d.setComposite(MapInfoConstants.INFO_COMPOSITE);
        g2d.setStroke(MapInfoConstants.INFO_STROKE);

        g2d.setColor(MapInfoConstants.TEXT_BG_COLOR);
        rect.setFrame(frameMinX, frameMinY, frameWidth, frameMaxY - frameMinY);
        g2d.fill(rect);

        g2d.setColor(Color.BLACK);
        g2d.drawString(str, (int) frameMinX + MapInfoConstants.TEXT_HORIZONTAL_MARGIN, (int) textY);

        g2d.setComposite(oc);
        g2d.setTransform(ot);

        setMapInfoNextY(g2d, yOffsetFromBottom + rect.getHeight() + MapInfoConstants.INFO_ROW_SPACING);
    }

    public void setMouseUtil(MouseUtil util) {
        this.mouse = util;
    }

    // TODO: these only work with Spherical Mercator
    private static double xToLongitude(double x) {
        return x;
    }

    private static double yToLatitude(double y) {
        double rad = Math.toRadians(y);
        double sinh = Math.sinh(rad);
        double atan = Math.atan(sinh);
        double finald = Math.toDegrees(atan);
        return finald;
    }

}