/*******************************************************************************
 * Copyright (c) 2012 Association for Decentralized Information Management
 * in Industry THTH ry.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
package org.simantics.maps.debug;

import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.RenderingHints;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.net.URI;
import java.net.URISyntaxException;

import org.simantics.maps.ProvisionException;
import org.simantics.maps.tile.ITileProvider;
import org.simantics.maps.tile.TileKey;

/**
 * @author Tuukka Lehtonen
 */
public class DebugTileProvider implements ITileProvider {

    private final Rectangle2D EXTENT = new Rectangle2D.Double(-180, -90, 360, 180);

    private int tileSize;

    private URI source;

    public DebugTileProvider(int tileSize) {
        this.tileSize = tileSize;

        try {
            this.source = new URI("debug://localhost");
        } catch (URISyntaxException e) {
            throw new Error("Should never happen", e);
        }
    }

    @Override
    public URI getSource() {
        return source;
    }

    @Override
    public Rectangle2D getExtent() {
        return (Rectangle2D) EXTENT.clone();
    }

    @Override
    public Image get(TileKey key) throws ProvisionException {
        int level = key.getLevel();
        int x = key.getX();
        int y = key.getY();

        double xTiles = Math.pow(2, level + 1);
        double yTiles = Math.pow(2, level);

        if (level < 0)
            throw new IllegalArgumentException("invalid tile level " + level + " (tile=" + key +")");
        if (x < 0 || x >= (int) xTiles)
            throw new IllegalArgumentException("tile x out of bounds " + x + " (tile=" + key +")");
        if (y < 0 || y >= (int) yTiles)
            throw new IllegalArgumentException("tile y out of bounds " + y + " (tile=" + key +")");

        Rectangle2D r = new Rectangle2D.Double();

        double minx = -180;
        double miny = -90;
        double w = 360;
        double h = 180;

        double xdelta = w / xTiles;
        double ydelta = h / yTiles;
        double xx = x;
        double yy = yTiles - y - 1;

        r.setFrame(
                minx + xdelta*xx,
                miny + ydelta*yy,
                xdelta,
                ydelta
        );
//        System.out.println(yTiles + ", " + key.y + " => " + r);

        BufferedImage image = new BufferedImage(tileSize, tileSize, BufferedImage.TYPE_3BYTE_BGR);
        Graphics2D g = image.createGraphics();
        try {
            g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);

            g.setFont(new Font(Font.SANS_SERIF, Font.BOLD, 32));

            g.setColor(Color.BLACK);
            g.fillRect(0, 0, tileSize, tileSize);
            g.setColor(Color.LIGHT_GRAY);
            g.fillRect(1, 1, tileSize - 1, tileSize - 1);
            g.setColor(Color.BLACK);

            drawCenteredString(g, tileSize + "x" + tileSize, tileSize, tileSize / 2 - 50);
            drawCenteredString(g, "(" + x + ", " + y + ")(" + level + ")", tileSize, tileSize / 2 + 50);

            drawCenteredString(g, r.getMaxY() + "", tileSize, 50);
            drawCenteredString(g, r.getMinY() + "", tileSize, 500);
            g.drawString(r.getMinX() + "", 20, tileSize / 2);
            g.drawString(r.getMaxX() + "", 412, tileSize / 2);

            // Simulate network delays
            try { Thread.sleep(100); } catch (InterruptedException e) {}

            return image;
        } finally {
            g.dispose();
        }
    }

    private void drawCenteredString(Graphics2D g, String str, int width, int y) {
        FontMetrics metrics = g.getFontMetrics();
        Rectangle2D r2d = metrics.getStringBounds(str, g);
        g.drawString(str, (int)(width / 2 - r2d.getWidth() / 2.0), y);
    }

}