From d8143db289b441562a69dcfa783d7d80c2f544c6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ra=C3=BAl=20Benencia?= <rul@kalgan.cc>
Date: Tue, 31 Mar 2015 16:20:39 -0300
Subject: input_move instead of coordinates. Introduce game_is_move_valid()

---
 lib/game.c  | 36 +++++++++++++++++++++++-------------
 lib/input.c | 12 ++++++++++--
 2 files changed, 33 insertions(+), 15 deletions(-)

(limited to 'lib')

diff --git a/lib/game.c b/lib/game.c
index b9294c9..63c69ba 100644
--- a/lib/game.c
+++ b/lib/game.c
@@ -6,24 +6,27 @@
 #include "move.h"
 #include "print.h"
 
-static Color _toggle_current_player(Color c) {
-    if (c == WHITE)
-        return BLACK;
-    else
-        return WHITE;
-}
-
 /*
+ * Return 1 if the received player is checkmated. Returns 0 otherwise.
  * TODO
  */
-int game_is_checkmate(Board board, Color color) {
+int game_is_checkmate(Board b, Color p) {
     return 0;
 }
 
+/*
+ * Check if a move is valid in the received board for the received player.
+ * TODO.
+ */
+int game_is_move_valid(Board b, Color p, Move m) {
+    return 1;
+}
+
 Board game_loop(Board board) {
     Board b = board;
     Color current_player = WHITE;
-    Coord orig, dest;
+    Move m;
+    int move_valid;
 
     while (!game_is_checkmate(b, current_player)) {
         print_board(b, current_player);
@@ -34,11 +37,18 @@ Board game_loop(Board board) {
         else
             puts("Black's turn");
 
-        orig = input_orig_coord();
-        dest = input_dest_coord();
+        move_valid = 0;
+        while (!move_valid) {
+            m = input_move();
+
+            if (game_is_move_valid(b, current_player, m))
+                move_valid = 1;
+            else
+                printf("Invalid move. Please, try again. ");
+        }
 
-        b = board_make_move(b, move_init(orig, dest));
-        current_player = _toggle_current_player(current_player);
+        b = board_make_move(b, m);
+        current_player = current_player == WHITE ? BLACK : WHITE;
     }
 
     return 0;
diff --git a/lib/input.c b/lib/input.c
index 63df8c5..8b696e1 100644
--- a/lib/input.c
+++ b/lib/input.c
@@ -3,6 +3,7 @@
 
 #include "coordinate.h"
 #include "input.h"
+#include "move.h"
 
 #define LENGTH 80
 
@@ -25,14 +26,21 @@ static Coord _input_coord() {
     return coord_init(line);
 }
 
-Coord input_orig_coord() {
+static Coord _input_orig_coord() {
     printf("Orig coordinate: ");
 
     return _input_coord();
 }
 
-Coord input_dest_coord() {
+static Coord _input_dest_coord() {
     printf("Dest coordinate: ");
 
     return _input_coord();
 }
+
+Move input_move() {
+    Coord orig = _input_orig_coord();
+    Coord dest = _input_dest_coord();
+
+    return move_init(orig, dest);
+}
-- 
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