/*
 * Copyright (c) 2018. Developed by Hedgecode.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.hedgecode.chess.img;

import java.awt.Graphics;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.image.RenderedImage;
import java.io.File;
import java.io.IOException;
import java.util.Map;

import javax.imageio.ImageIO;

import org.hedgecode.chess.img.board.Board;
import org.hedgecode.chess.img.board.BoardLoader;
import org.hedgecode.chess.img.piece.PieceSet;
import org.hedgecode.chess.img.piece.PieceSetLoader;
import org.hedgecode.chess.position.ColorPiece;
import org.hedgecode.chess.position.Position;
import org.hedgecode.chess.position.Positions;
import org.hedgecode.chess.position.Square;

/**
 *
 *
 * @author Dmitry Samoshin aka gotty
 */
public class DiagramBuilder implements ImageBuilder {

    private static ImageBuilder _instance = new DiagramBuilder();

    private BoardLoader boardLoader;
    private PieceSetLoader pieceSetLoader;

    private DiagramBuilder() {
        boardLoader = new BoardLoader();
        pieceSetLoader = new PieceSetLoader();
    }

    @Override
    public String build(Position position) {
        return ""; // todo
    }

    @Override
    public RenderedImage build(Position position, String boardType, String pieceType)
            throws ImageException
    {
        Map<Square, ColorPiece> squares = position.getSquares();

        Board board = boardLoader.load(boardType);
        PieceSet pieces = pieceSetLoader.load(pieceType);

        if (board == null || pieces == null) {
            throw new ImageException("Couldn't find image resources!"); // todo: locale
        }

        int squareSize = board.squareSize();

        BufferedImage diagram = board.render();
        Graphics diagramGraphics = diagram.getGraphics();
        for (int y = 0; y < Square.getSize(); ++y) {
            for (int x = 0; x < Square.getSize(); ++x) {
                Square square = Square.getSquare(x, Square.getSize() - (y + 1));
                ColorPiece colorPiece = squares.get(square);
                if (colorPiece != null) {
                    diagramGraphics.drawImage(
                            pieces.get(colorPiece).getScaledInstance(
                                    squareSize, squareSize, Image.SCALE_SMOOTH
                            ),
                            x * squareSize,
                            y * squareSize,
                            null
                    );
                }
            }
        }
        return diagram;
    }

    public static ImageBuilder getInstance() {
        return _instance;
    }


    public static void main(String[] args) throws IOException, ImageException {

        ImageIO.write(
                DiagramBuilder.getInstance().build(Positions.INITIAL.getPosition(), "test", "shade"),
                ImageFormat.PNG.name(),
                new File("chessboard" + "." + ImageFormat.PNG.getExt())
        );

/*
        String[] formatNames;
        Set<String> set = new HashSet<>();

        formatNames = ImageIO.getReaderFormatNames();
        for (String formatName : formatNames)
            set.add(formatName.toLowerCase());
        System.out.println("Supported read formats: " + set);

        set.clear();

        formatNames = ImageIO.getWriterFormatNames();
        for (String formatName : formatNames)
            set.add(formatName.toLowerCase());
        System.out.println("Supported write formats: " + set);

        set.clear();

        formatNames = ImageIO.getReaderMIMETypes();
        for (String formatName : formatNames)
            set.add(formatName.toLowerCase());
        System.out.println("Supported read MIME types: " + set);

        set.clear();

        formatNames = ImageIO.getWriterMIMETypes();
        for (String formatName : formatNames)
            set.add(formatName.toLowerCase());
        System.out.println("Supported write MIME types: " + set);
*/
    }

}