updated UML

Reviewed-on: #1

.gitignore

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+# ---> Java
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+replay_pid*
+

LICENSE

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+MIT License
+
+Copyright (c) 2026 lin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and 
+associated documentation files (the "Software"), to deal in the Software without restriction, including 
+without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 
+copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the 
+following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial 
+portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT 
+LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO 
+EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER 
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 
+USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# Sakk alkalmazás (gui-chess)
+Programozás alapjai 3 – Nagy házi feladat specifikáció
+
+## 1. Célkitűzés
+A projekt célja egy teljes körű sakkalkalmazás implementálása Java nyelven. A feladat alapját a „Programozás alapjai 2” tárgyban készült C++ sakkmotor adja, melynek logikáját átemelve, az objektumorientált elveket és a Java nyelvi sajátosságait kihasználva egy grafikus felhasználói felülettel (GUI) és parancssori réteggel is rendelkező szoftver készül.
+
+## 2. Funkcionális követelmények
+### 2.1 Játékszabályok és játékmódok
+- Szabályrendszer: A standard sakk szabályainak teljes körű ellenőrzése és betartatása (szabályos lépések, sakk, matt, patt helyzetek detektálása, sáncolás, en passant és gyalogátváltozás).
+- Játékos módok: Lokális kétfős játék (Hotseat mód), ahol a felek felváltva lépnek ugyanazon a felületen.
+- Lépésvisszavonás és elemzés: Lehetőség a lépések visszavonására (Undo) és előreléptetésére.
+
+### 2.2 Felhasználói felületek
+- Grafikus felület (GUI):
+  - Interaktív sakktábla (kattintásos vagy drag-and-drop bábulépéssel).
+  - Vizuális visszajelzés az érvényes lépésekről és az aktuális sakkhelyzetről.
+  - Lépéslista (Move history) megjelenítése algebrai jelöléssel.
+- Konzolos felület (CLI):
+  - A sakktábla kirajzolása terminálban szöveges karakterekkel.
+  - Lépések fogadása standard szöveges formátumban (pl. `e2e4`).
+
+### 2.3. Adatkezelés és perzisztencia
+- PGN (Portable Game Notation) támogatás:
+  - Külső forrásból származó (pl. [Chess.com](https://chess.com), [Lichess](https://lichess.org)) standard `.pgn` formátumú játszmák beolvasása, elemzése és visszajátszása.
+  - Az aktuálisan játszott parti kimentése szabványos PGN fájlba a metaadatokkal (dátum, felek nevei, eredmény) együtt.
+- Állásmentés (FEN): Az aktuális táblaállás gyors betöltése és exportálása FEN (Forsyth–Edwards Notation) karakterlánccal.
+
+## 3. Nem funkcionális követelmények és architektúra
+- Választott architektúra (MVC):
+  - Model: A sakktábla állapota, szabályellenőrzés, bábuk reprezentációja és lépésgenerálás. A motor teljesen független a megjelenítéstől.
+
+  - View: `Java Swing` komponensek és a CLI kirajzoló modul.
+
+  - Controller: Eseménykezelők, amelyek a felhasználói beviteleket (GUI kattintás, CLI parancs) továbbítják a motornak.
+
+- Perzisztencia / Fájlkezelés: Szabványos Java I/O, kivételkezeléssel.
+
+- Tesztelhetőség: A játékmotor üzleti logikáját (speciális lépések, matt detektálás, PGN parser) lefedő JUnit egységtesztek.
+
+## 4. Terv
+### 4.1 Szereplők
+- Játékos: Az a személy aki játszmát kezdeményez, lépéseket tesz, kezeli a játék felületét.
+- Fájlrendszer: Másodlagos szereplő. PGN/FEN állományokat kezel.
+
+### 4.2 Használati esetek (Use Cases):
+- Új játszma indítása
+- Lépés megtétele a táblán
+- Lehetséges lépések megtekintése
+- Lépés visszavonása
+- Játszma mentése (PGN formátumban)
+- Játszma betöltése és visszajátszása (PGN formátumból)
+- Táblaállás betöltése/mentése (FEN formátumból/ban)
+
+### 4.3 GUI váza:
+```text
++-------------------------------------------------------------+
+| Menüsor: [Fájl (Új, Betöltés, Mentés)] [Nézet] [Segítség]   |
++-------------------------------------------------------------+
+|  +---------------------------+  +------------------------+  |
+|  |                           |  | Státusz / Soron lévő:  |  |
+|  |                           |  | Fehér                  |  |
+|  |                           |  | Sakk jelzés: Nincs     |  |
+|  |                           |  +------------------------+  |
+|  |                           |  | Lépéstörténet:         |  |
+|  |        SAKKTÁBLA          |  | 1. e4 e5               |  |
+|  |         (8 x 8)           |  | 2. Nf3 Nc6             |  |
+|  |                           |  | 3. Bb5 ...             |  |
+|  |                           |  +------------------------+  |
+|  |                           |  | Vezérlők:              |  |
+|  |                           |  | [< Előző] [Következő >]|  |
+|  |                           |  | [Undo]                 |  |
+|  +---------------------------+  +------------------------+  |
++-------------------------------------------------------------+
+```
+
+### 4.4 UML
+![UML diagram](assets/Diagram.svg)

assets/Diagram.drawio

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+  <diagram id="C5RBs43oDa-KdzZeNtuy" name="Oldal-1">
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+              <mxPoint x="-25" y="-131" />
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+  </diagram>
+</mxfile>

assets/Diagram.svg

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+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
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gui-chess/src/main/java/com/gitea/lin/model/Color.java

@@ -0,0 +1,6 @@
+package com.gitea.lin.model;
+
+public enum Color {
+    WHITE,
+    BLACK,
+}

gui-chess/src/main/java/com/gitea/lin/model/Direction.java

@@ -0,0 +1,53 @@
+package com.gitea.lin.model;
+
+public enum Direction {
+    // Orthogonal (Rook, Queen, King)
+    NORTH(0, -1),
+    SOUTH(0, 1),
+    EAST(1, 0),
+    WEST(-1, 0),
+
+    // Diagonal (Bishop, Queen, King, Pawn captures)
+    NORTH_EAST(1, -1),
+    NORTH_WEST(-1, -1),
+    SOUTH_EAST(1, 1),
+    SOUTH_WEST(-1, 1),
+
+    // Knight Jumps (L-shapes)
+    KNIGHT_NNE(1, -2),
+    KNIGHT_ENE(2, -1),
+    KNIGHT_ESE(2, 1),
+    KNIGHT_SSE(1, 2),
+    KNIGHT_SSW(-1, 2),
+    KNIGHT_WSW(-2, 1),
+    KNIGHT_WNW(-2, -1),
+    KNIGHT_NNW(-1, -2),
+
+    // Pawn Initial Double Push
+    PAWN_DOUBLE_NORTH(0, -2),
+    PAWN_DOUBLE_SOUTH(0, 2);
+
+    private final int dx;
+    private final int dy;
+
+    Direction(int dx, int dy) {
+        this.dx = dx;
+        this.dy = dy;
+    }
+
+    public int getDx() {
+        return dx;
+    }
+
+    public int getDy() {
+        return dy;
+    }
+
+    /**
+     * Converts the 2D vector into a 1D array offset for Piece[64].
+     * (Assuming index 0 is top-left a8 and 63 is bottom-right h1)
+     */
+    public int getFlatOffset() {
+        return dy * 8 + dx;
+    }
+}

gui-chess/src/main/java/com/gitea/lin/model/Piece/Bishop.java

@@ -0,0 +1,24 @@
+package com.gitea.lin.model.Piece;
+
+import com.gitea.lin.model.Color;
+import com.gitea.lin.model.Direction;
+import com.gitea.lin.model.Type;
+
+import static com.gitea.lin.model.Direction.*;
+
+public final class Bishop extends Piece {
+    public Bishop(Color c) {
+        super(c);
+    }
+
+    @Override
+    public Direction[] getMoveDomain() {
+        return new Direction[] {NORTH_EAST, NORTH_WEST, SOUTH_EAST, SOUTH_WEST};
+    }
+    @Override
+    public int getMaximumStep() { return 7; }
+    @Override
+    public char getSymbol() { return 'B'; }
+    @Override
+    public Type getType() { return Type.BISHOP; }
+}

gui-chess/src/main/java/com/gitea/lin/model/Piece/King.java

@@ -0,0 +1,33 @@
+package com.gitea.lin.model.Piece;
+
+import com.gitea.lin.model.Color;
+import com.gitea.lin.model.Direction;
+import com.gitea.lin.model.Type;
+
+import static com.gitea.lin.model.Direction.*;
+
+public final class King extends Piece {
+    public King(Color c) {
+        super(c);
+    }
+
+    @Override
+    public Direction[] getMoveDomain() {
+        return new Direction[] {NORTH, NORTH_EAST, EAST, SOUTH_EAST, SOUTH, SOUTH_WEST, WEST, NORTH_WEST};
+    }
+
+    @Override
+    public int getMaximumStep() {
+        return 1;
+    }
+
+    @Override
+    public char getSymbol() {
+        return 'K';
+    }
+
+    @Override
+    public Type getType() {
+        return Type.KING;
+    }
+}

gui-chess/src/main/java/com/gitea/lin/model/Piece/Knight.java

@@ -0,0 +1,24 @@
+package com.gitea.lin.model.Piece;
+
+import com.gitea.lin.model.Color;
+import com.gitea.lin.model.Direction;
+import com.gitea.lin.model.Type;
+
+import static com.gitea.lin.model.Direction.*;
+
+public final class Knight extends Piece {
+    public Knight(Color c) {
+        super(c);
+    }
+
+    @Override
+    public Direction[] getMoveDomain() {
+        return new Direction[] {KNIGHT_ENE, KNIGHT_ESE, KNIGHT_NNE, KNIGHT_NNW, KNIGHT_SSE, KNIGHT_SSW, KNIGHT_WNW, KNIGHT_WSW};
+    }
+    @Override
+    public int getMaximumStep() { return 2; }
+    @Override
+    public char getSymbol() { return 'N'; }
+    @Override
+    public Type getType() { return Type.KNIGHT; }
+}

gui-chess/src/main/java/com/gitea/lin/model/Piece/Pawn.java

@@ -0,0 +1,44 @@
+package com.gitea.lin.model.Piece;
+
+import com.gitea.lin.model.Color;
+import com.gitea.lin.model.Direction;
+import com.gitea.lin.model.Type;
+
+import static com.gitea.lin.model.Direction.*;
+
+public final class Pawn extends Piece {
+    public Pawn(Color c) {
+        super(c);
+    }
+
+    @Override
+    public Direction[] getMoveDomain() {
+        boolean isWhite = super.getColor() == Color.WHITE;
+
+        Direction forward = isWhite ? NORTH : SOUTH;
+        Direction forwardDouble = isWhite ? PAWN_DOUBLE_NORTH : PAWN_DOUBLE_SOUTH;
+        Direction hitLeft = isWhite ? NORTH_WEST : SOUTH_WEST;
+        Direction hitRight = isWhite ? NORTH_EAST : SOUTH_EAST;
+
+        if (super.hasMoved()) {
+            return new Direction[] {forward, hitLeft, hitRight};
+        }
+
+        return new Direction[] {forward, forwardDouble, hitLeft, hitRight};
+    }
+
+    @Override
+    public int getMaximumStep() {
+        return super.hasMoved() ? 1 : 2;
+    }
+
+    @Override
+    public char getSymbol() {
+        return 'P';
+    }
+
+    @Override
+    public Type getType() {
+        return Type.PAWN;
+    }
+}

gui-chess/src/main/java/com/gitea/lin/model/Piece/Piece.java

@@ -0,0 +1,27 @@
+package com.gitea.lin.model.Piece;
+
+import com.gitea.lin.model.Color;
+import com.gitea.lin.model.Direction;
+import com.gitea.lin.model.Type;
+
+public abstract class Piece {
+    private Color pieceColor;
+    private boolean movedBefore;
+
+    public Piece(Color c) {
+        this.pieceColor = c;
+    }
+
+    public abstract Direction[] getMoveDomain();
+    public abstract int getMaximumStep(); // TODO: Update UML
+    public abstract char getSymbol();
+    public abstract Type getType();
+
+    public Color getColor() {
+        return this.pieceColor;
+    }
+
+    public boolean hasMoved() {
+        return this.movedBefore;
+    }
+}

gui-chess/src/main/java/com/gitea/lin/model/Piece/Queen.java

@@ -0,0 +1,24 @@
+package com.gitea.lin.model.Piece;
+
+import com.gitea.lin.model.Color;
+import com.gitea.lin.model.Direction;
+import com.gitea.lin.model.Type;
+
+import static com.gitea.lin.model.Direction.*;
+
+public final class Queen extends Piece {
+    public Queen(Color c) {
+        super(c);
+    }
+
+    @Override
+    public Direction[] getMoveDomain() {
+        return new Direction[] {NORTH, NORTH_EAST, EAST, SOUTH_EAST, SOUTH, SOUTH_WEST, WEST, NORTH_WEST};
+    }
+    @Override
+    public int getMaximumStep() { return 7; }
+    @Override
+    public char getSymbol() { return 'Q'; }
+    @Override
+    public Type getType() { return Type.QUEEN; }
+}

gui-chess/src/main/java/com/gitea/lin/model/Piece/Rook.java

@@ -0,0 +1,24 @@
+package com.gitea.lin.model.Piece;
+
+import com.gitea.lin.model.Color;
+import com.gitea.lin.model.Direction;
+import com.gitea.lin.model.Type;
+
+import static com.gitea.lin.model.Direction.*;
+
+public final class Rook extends Piece {
+    public Rook(Color c) {
+        super(c);
+    }
+
+    @Override
+    public Direction[] getMoveDomain() {
+        return new Direction[] {NORTH, EAST, SOUTH, WEST};
+    }
+    @Override
+    public int getMaximumStep() { return 7; }
+    @Override
+    public char getSymbol() { return 'R'; }
+    @Override
+    public Type getType() { return Type.ROOK; }
+}

gui-chess/src/main/java/com/gitea/lin/model/Type.java

@@ -0,0 +1,10 @@
+package com.gitea.lin.model;
+
+public enum Type {
+    PAWN,
+    KING,
+    QUEEN,
+    ROOK,
+    BISHOP,
+    KNIGHT,
+}