feat: rudimentary play with randomized opponent moves

4 files changed, 84 insertions, 33 deletions

diff --git a/src/consts.h b/src/consts.h
index b1eaab2..6a482bd 100644
--- a/src/consts.h
+++ b/src/consts.h
@@ -1,4 +1,3 @@
 #define EMPTY 0
 #define X 1
-#define O 2
-#define TIE 3
\ No newline at end of file
+#define O 2
\ No newline at end of file
diff --git a/src/main.c b/src/main.c
index ebccfd4..01a440d 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,10 +1,11 @@
 #include <conio.h>
 #include <stdio.h>
+#include <stdlib.h>
 
 #include "consts.h"
 #include "protos.h"
 
-char is_board_solved(BOARD board) {
+SOLUTION is_board_solved(BOARD board) {
     char cases[8] = {EMPTY};
     char i;
 
@@ -22,10 +23,10 @@ char is_board_solved(BOARD board) {
     for (i = 0; i < 8; i++) {
         if (cases[i] == 1) {
             // X won
-            return X;
+            return X_WON;
         } else if (cases[i] == 8) {
             // O won
-            return O;
+            return O_WON;
         }
     }
 
@@ -33,7 +34,7 @@ char is_board_solved(BOARD board) {
     for (i = 0; i < 9; i++) {
         if (cases[i] == EMPTY) {
             // more spaces left; game continues
-            return EMPTY;
+            return MOVES_LEFT;
         }
     }
 
@@ -44,6 +45,7 @@ char is_board_solved(BOARD board) {
 void print_board(BOARD board) {
     char i, j;
 
+    printf("\n");
     for (i = 0; i < 3; i++) {
         for (j = 0; j < 3; j++) {
             printf("%d ", board[i][j]);
@@ -52,41 +54,85 @@ void print_board(BOARD board) {
     }
 }
 
+void opponent_move(BOARD board, DIFFICULTY difficulty) {
+    char move, move_x, move_y;
+    printf("Opponent is moving...");
+
+    // take winning moves (medium)
+    // if (difficulty > EASY) {
+    // }
+
+    // prevent winning move (hard)
+    // if (difficulty > MEDIUM) {
+    // }
+
+    // take random move (easy)
+    do {
+        move = rand() % 9;
+        move_x = move % 3;
+        move_y = move / 3;
+    } while (board[move_y][move_x] != EMPTY);
+
+    board[move_y][move_x] = O;
+}
+
+void print_endgame(SOLUTION solution) {
+    switch (solution) {
+        case X_WON:
+            printf("X won");
+            break;
+        case O_WON:
+            printf("O won");
+            break;
+        case TIE:
+            printf("Stalemate");
+            break;
+    }
+    printf("\n");
+}
+
+void player_move(BOARD board) {
+    char move = EMPTY;
+    char move_x = EMPTY;
+    char move_y = EMPTY;
+
+    printf("Enter a move...");
+
+    move = cgetc() - '0' - 1;
+    // if move is not a number then bail
+    // if (move < 1 || move > 8) { invalid! }
+    move_x = move % 3;
+    move_y = move / 3;
+    // if move not already taken
+    board[move_y][move_x] = X;
+}
+
 int main() {
-    char solution = EMPTY;
+    SOLUTION solution = MOVES_LEFT;
     char move = EMPTY;
     char move_x = EMPTY;
     char move_y = EMPTY;
     BOARD board = {{EMPTY}, {EMPTY}, {EMPTY}};
 
-    while (1) {
+    cursor(1);
+
+    while (solution == MOVES_LEFT) {
         print_board(board);
+        player_move(board);
 
-        solution = is_board_solved(board);
-        switch (solution) {
-            case X:
-                printf("X won");
-                break;
-            case O:
-                printf("O won");
-                break;
-            case TIE:
-                printf("Stalemate");
-                break;
-            default:
-                printf("Enter a move...");
+        if ((solution = is_board_solved(board)) != MOVES_LEFT) {
+            print_endgame(solution);
+            return 0;
         }
-        printf("\n");
 
-        cursor(1);
-        move = cgetc() - '0' - 1;
-        // if move is not a number then bail
-        // if (move < 1 || move > 8) { invalid! }
-        move_x = move % 3;
-        move_y = move / 3;
-        // if move not already taken
-        board[move_y][move_x] = X;
+        print_board(board);
+        opponent_move(board, EASY);
+
+        if ((solution = is_board_solved(board)) != MOVES_LEFT) {
+            print_endgame(solution);
+            return 0;
+        }
     }
 
     return 0;
-}
\ No newline at end of file
+}
diff --git a/src/protos.h b/src/protos.h
index b658923..e914f5d 100644
--- a/src/protos.h
+++ b/src/protos.h
@@ -1,4 +1,7 @@
 #include "types.h";
 
-char is_board_solved(BOARD board);
-void print_board(BOARD board);
\ No newline at end of file
+SOLUTION is_board_solved(BOARD board);
+void print_board(BOARD board);
+void opponent_move(BOARD board, DIFFICULTY difficulty);
+void print_endgame(SOLUTION solution);
+void player_move(BOARD board);
diff --git a/src/types.h b/src/types.h
index 0e441ed..f8a3367 100644
--- a/src/types.h
+++ b/src/types.h
@@ -1 +1,4 @@
 typedef char BOARD[3][3];
+
+typedef enum { MOVES_LEFT = 0, X_WON = 1, O_WON = 2, TIE = 3 } SOLUTION;
+typedef enum { EASY, MEDIUM, HARD } DIFFICULTY;
\ No newline at end of file