/*
 * 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;

import java.io.File;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

import org.apache.commons.configuration.XMLConfiguration;
import org.apache.commons.configuration.HierarchicalConfiguration;
import org.apache.commons.configuration.SubnodeConfiguration;

import org.junit.Test;

import org.hedgecode.chess.fen.FENBuilderTest;
import org.hedgecode.chess.position.Castle;
import org.hedgecode.chess.position.Color;
import org.hedgecode.chess.position.ColorPiece;
import org.hedgecode.chess.position.Position;
import org.hedgecode.chess.position.Positions;
import org.hedgecode.chess.position.Square;

/**
 * Abstract Common Chess Position Test class.
 *
 * @author Dmitry Samoshin aka gotty
 */
public abstract class AbstractPositionTest extends AbstractXMLConfigTest {

    protected static final String NAME = "name";
    protected static final String POSITION = "position";

    private static final String INITIAL = "initial";
    private static final String EMPTY = "empty";
    private static final String SQUARES = "squares";
    private static final String MOVE = "move";
    private static final String CASTLE = "castle";
    private static final String EN_PASSANT = "enPassant";
    private static final String HALFMOVE = "halfmove";
    private static final String FULLMOVE = "fullmove";

    private static final String MSG_POSITION = "[%s]:";
    private static final String MSG_POSITION_SQUARE = "[%s -> Square %s]:";
    private static final String MSG_POSITION_MOVE = "[%s -> Move]:";
    private static final String MSG_POSITION_CASTLE = "[%s -> Castle (%s)]:";
    private static final String MSG_POSITION_EN_PASSANT = "[%s -> En Passant]:";
    private static final String MSG_POSITION_HALFMOVE = "[%s -> Halfmove]:";
    private static final String MSG_POSITION_FULLMOVE = "[%s -> Fullmove]:";

    private String positionName;

    public abstract List<XMLConfiguration> getXMLPositions() throws Exception;

    @Test
    public void testPositions() throws Exception {
        for (XMLConfiguration xmlConfig : getXMLPositions())
            testPosition(xmlConfig);
    }

    public void testPosition(HierarchicalConfiguration xmlPosition) throws Exception {
        boolean isInitial = false, isEmpty = false;
        boolean isSquares = !xmlPosition.subset(SQUARES).isEmpty();
        if (xmlPosition.containsKey(INITIAL))
            isInitial = xmlPosition.getBoolean(INITIAL);
        if (xmlPosition.containsKey(EMPTY))
            isEmpty = xmlPosition.getBoolean(EMPTY);
        assertTrue(
                isInitial || isEmpty || isSquares
        );
        if (isSquares && !isEmpty) {
            SubnodeConfiguration squaresNode = xmlPosition.configurationAt(SQUARES);
            Iterator<String> keys = squaresNode.getKeys();
            while (keys.hasNext()) {
                String key = keys.next();
                String value = squaresNode.getString(key);
                assertNotNull(
                        Square.getSquare(key)
                );
                assertNotNull(
                        ColorPiece.valueOf(value)
                );
            }
        }
        if (xmlPosition.containsKey(MOVE)) {
            assertNotNull(
                    Color.valueOf(
                            xmlPosition.getString(MOVE)
                    )
            );
        }
        if (!xmlPosition.subset(CASTLE).isEmpty()) {
            SubnodeConfiguration castleNode = xmlPosition.configurationAt(CASTLE);
            Iterator<String> keys = castleNode.getKeys();
            while (keys.hasNext()) {
                String key = keys.next();
                String value = castleNode.getString(key);
                assertNotNull(
                        Color.valueOf(key.toUpperCase())
                );
                assertNotNull(
                        Castle.valueOf(value)
                );
            }
        }
        if (xmlPosition.containsKey(EN_PASSANT)) {
            assertNotNull(
                    Square.getSquare(
                            xmlPosition.getString(EN_PASSANT)
                    )
            );
        }
        if (xmlPosition.containsKey(HALFMOVE)) {
            assertTrue(
                    xmlPosition.getInt(HALFMOVE, -1) >= 0
            );
        }
        if (xmlPosition.containsKey(FULLMOVE)) {
            assertTrue(
                    xmlPosition.getInt(FULLMOVE, 0) > 0
            );
        }
    }

    @Override
    protected String getConfigName() {
        return getClass().getSimpleName();
    }

    protected Position assignPosition(HierarchicalConfiguration xmlPosition) {
        if (xmlPosition.containsKey(INITIAL) && xmlPosition.getBoolean(INITIAL)) {
            return Positions.INITIAL.getPosition();
        }
        Position position = Positions.EMPTY.getPosition();
        if (!xmlPosition.subset(SQUARES).isEmpty()) {
            SubnodeConfiguration squaresNode = xmlPosition.configurationAt(SQUARES);
            Iterator<String> keys = squaresNode.getKeys();
            while (keys.hasNext()) {
                String key = keys.next();
                String value = squaresNode.getString(key);
                position.setPiece(
                        ColorPiece.valueOf(value),
                        Square.getSquare(key)
                );
            }
        }
        if (xmlPosition.containsKey(MOVE))
            position.setMove(
                    Color.valueOf(
                            xmlPosition.getString(MOVE)
                    )
            );
        if (!xmlPosition.subset(CASTLE).isEmpty()) {
            SubnodeConfiguration castleNode = xmlPosition.configurationAt(CASTLE);
            Iterator<String> keys = castleNode.getKeys();
            while (keys.hasNext()) {
                String key = keys.next();
                String value = castleNode.getString(key);
                position.setCastle(
                        Color.valueOf(key.toUpperCase()),
                        Castle.valueOf(value)
                );
            }
        }
        if (xmlPosition.containsKey(EN_PASSANT))
            position.setEnPassant(
                    Square.getSquare(
                            xmlPosition.getString(EN_PASSANT)
                    )
            );
        if (xmlPosition.containsKey(HALFMOVE))
            position.setHalfMove(
                    xmlPosition.getInt(HALFMOVE)
            );
        if (xmlPosition.containsKey(FULLMOVE))
            position.setFullMove(
                    xmlPosition.getInt(FULLMOVE)
            );
        return position;
    }

    protected void assertPositionEquals(Position expected, Position actual) {
        assertDiagramEquals(
                expected,
                actual
        );
        assertEquals(
                String.format(
                        MSG_POSITION_MOVE,
                        positionName
                ),
                expected.getMove(),
                actual.getMove()
        );
        assertEquals(
                String.format(
                        MSG_POSITION_CASTLE,
                        positionName,
                        Color.WHITE
                ),
                expected.getCastle(Color.WHITE),
                actual.getCastle(Color.WHITE)
        );
        assertEquals(
                String.format(
                        MSG_POSITION_CASTLE,
                        positionName,
                        Color.BLACK
                ),
                expected.getCastle(Color.BLACK),
                actual.getCastle(Color.BLACK)
        );
        assertEquals(
                String.format(
                        MSG_POSITION_EN_PASSANT,
                        positionName
                ),
                expected.getEnPassant(),
                actual.getEnPassant()
        );
        assertEquals(
                String.format(
                        MSG_POSITION_HALFMOVE,
                        positionName
                ),
                expected.getHalfMove(),
                actual.getHalfMove()
        );
        assertEquals(
                String.format(
                        MSG_POSITION_FULLMOVE,
                        positionName
                ),
                expected.getFullMove(),
                actual.getFullMove()
        );
    }

    protected void assertDiagramEquals(Position expected, Position actual) {
        assertNotNull(
                expected
        );
        assertNotNull(
                actual
        );
        assertSquaresEquals(
                expected.getSquares(),
                actual.getSquares()
        );
    }

    private void assertSquaresEquals(Map<Square, ColorPiece> expected, Map<Square, ColorPiece> actual) {
        for (Map.Entry<Square, ColorPiece> entry : expected.entrySet()) {
            assertEquals(
                    String.format(
                            MSG_POSITION_SQUARE,
                            positionName,
                            entry.getKey().name()
                    ),
                    entry.getValue(),
                    actual.get(entry.getKey())
            );
        }
    }

    protected void assertStringEquals(String expected, String actual) {
        assertEquals(
                String.format(
                        MSG_POSITION,
                        positionName
                ),
                expected,
                actual
        );
    }

    public String getPositionName() {
        return positionName;
    }

    protected void setPositionName(String name) {
        positionName = name;
    }


/*
    public static void main(String[] args) throws Exception {
        XMLConfiguration xmlConfig = new XMLConfiguration(
                new File(
                        FENBuilderTest.class.getResource("FENBuilderTest.xml").toURI()
                )
        );
        for (HierarchicalConfiguration testConfig : xmlConfig.configurationsAt(TESTS)) {
            AbstractPositionTest.testPosition(
                    testConfig.configurationAt(POSITION)
            );
        }
    }
*/

}