Add load/save functions

src/GomokuGame.java

@@ -1,4 +1,8 @@
 import java.nio.file.Path;
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.IOException;
+import java.nio.file.Files;
 
 public class GomokuGame {
 
@@ -11,9 +15,25 @@ public class GomokuGame {
 
     private int boardWidth;
     private int boardHeight;
+    private GomokuBoard board;
+
+    Color colorP1;
+    int currP;
+    int nbTokens1, nbTokens2;
 
     public static void main(String[] args) {
-        System.out.println("Hello World!");
+        // Test
+        GomokuGame g = new GomokuGame();
+        System.out.println(g.load(Path.of(".cache/test.dat")));
+        System.out.println(g.getBoard());
+        System.out.println(g.save(Path.of(".cache/save.dat")));
+
+        for (int i = 0; i < g.boardHeight; ++i) {
+            for (int j = 0; j < g.boardWidth; ++j) {
+                System.out.print(g.getBoard().get(i ,j));
+            }
+            System.out.println();
+        }
     }
 
     public void newGame() {
@@ -24,15 +44,130 @@ public class GomokuGame {
 
     }
 
-    public void save(Path filename) {
+    public boolean save(Path filename) {
+        // save the game state to the file
+        // 1. Open the file
+        // 2. Write the first line with:
+        //      w h colorP1 currP nbTokens1 nbTokens2
+        // 3. Write the next h lines with the board
+        // 4. Close the file
+        // 5. Return true if successful, false otherwise
 
+        // if filename is null, save to default file in ".cache/save.dat"
+        if (filename == null) {
+            filename = Path.of(".cache/save.dat");
+        }
+
+        try (BufferedWriter writer = Files.newBufferedWriter(filename)) {
+            // Write the first line
+            writer.write(String.format("%d %d %s %d %d %d%n",
+                    this.boardWidth, this.boardHeight, colorP1, currP, nbTokens1, nbTokens2));
+
+            // Write the board
+            for (int i = 0; i < boardHeight; ++i) {
+                for (int j = 0; j < boardWidth; ++j) {
+                    char c;
+                    switch (board.get(i, j).getState()) {
+                        case BLACK: c = 'X'; break;
+                        case WHITE: c = 'O'; break;
+                        case NIL:   c = '.'; break;
+                        default: throw new IllegalStateException(
+                            String.format("Unexpected value at cell (%d, %d): %s", i, j, board.get(i, j).getState())
+                        );
+                    }
+                    writer.write(c);
+                }
+                writer.newLine();
+            }
+        } catch (IOException e) {
+            System.err.println("Error writing file: " + e.getMessage());
+            return false;
+        } catch (Exception e) {
+            System.err.println("Unexpected error: " + e.getMessage());
+            return false;
+        }
+        return true;
     }
 
-    public void load(Path filename) {
+    public boolean load(Path filename) {
+        // load the game state from the file
+        // 1. Open the file
+        // 2. Read the first line to get:
+        //      w h colorP1 currP nbTokens1 nbTokens2
+        // 3. Read the next h lines to get the board
+        // 4. Close the file
+        // 5. Initialize the board with the read values
 
+        int w, h;
+        Color[][] colors;
+
+        try (BufferedReader reader = Files.newBufferedReader(filename)) {
+            String line = reader.readLine();
+            if (line == null) {
+                throw new IOException("Empty save file");
+            }
+
+            String[] parts = line.split(" ");
+            if (parts.length != 6) {
+                throw new IOException("Invalid save file format");
+            }
+            w = Integer.parseInt(parts[0]);
+            h = Integer.parseInt(parts[1]);
+            colorP1 = Color.valueOf(parts[2]);
+            currP = Integer.parseInt(parts[3]);
+            nbTokens1 = Integer.parseInt(parts[4]);
+            nbTokens2 = Integer.parseInt(parts[5]);
+
+            if (w <= 0 || h <= 0) {
+                throw new IllegalArgumentException("Invalid board dimensions");
+            }
+
+            colors = new Color[h][w];
+
+            for (int i = 0; i < h; ++i) {
+                line = reader.readLine();
+                if (line == null) {
+                    throw new IOException("Unexpected end of file");
+                }
+
+                if (line.length() != w) {
+                    throw new IOException("Invalid board line format");
+                }
+
+                for (int j = 0; j < w; ++j) {
+                    switch (line.charAt(j)) {
+                        case 'X': colors[i][j] = Color.BLACK; break;
+                        case 'O': colors[i][j] = Color.WHITE; break;
+                        case '.': colors[i][j] = Color.NIL;   break;
+                        default:
+                            throw new IllegalArgumentException("Invalid color: " + line.charAt(j));
+                    }
+                }
+            }
+
+        } catch (IOException e) {
+            System.err.println("Error reading file: " + e.getMessage());
+            return false;
+        } catch (NumberFormatException e) {
+            System.err.println("Invalid number format: " + e.getMessage());
+            return false;
+        } catch (IllegalArgumentException e) {
+            System.err.println("Invalid color format: " + e.getMessage());
+            return false;
+        } catch (Exception e) {
+            System.err.println("Unexpected error: " + e.getMessage());
+            return false;
+        }
+
+        // Initialize the board with the read values
+        this.boardWidth  = w;
+        this.boardHeight = h;
+        this.board = new GomokuBoard(w, h, colors);
+
+        return true;
     }
 
     public GomokuBoard getBoard() {
-        return new GomokuBoard(0,0);
+        return this.board;
     }
 }