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#include <stdbool.h>
#include "othello.h"
bool is_valid_move(const enum player_color board[8][8],
const enum player_color current_player,
const struct move move) {
// The move must be a positive position
if (move.row < 0 || move.col < 0) {
return false;
}
// The move must be an empty spot to be valid
if (board[move.row][move.col] != EMPTY) {
return false;
}
const enum player_color other_color = current_player == WHITE ? BLACK : WHITE;
bool is_valid_up = false;
bool is_valid_down = false;
bool is_valid_left = false;
bool is_valid_right = false;
if (!is_valid_up && !is_valid_down && !is_valid_left && !is_valid_right) {
// Check if valid up
bool would_flip_oppenent = false;
bool has_other_end = false;
for (int i = move.row - 1; i > 0 && !has_other_end; i--) {
if (board[i][move.col] == current_player) {
has_other_end = true;
} else if (board[i][move.col] == other_color) {
would_flip_oppenent = true;
} else {
// We have reached an empty tile
break;
}
}
is_valid_up = has_other_end && would_flip_oppenent;
}
if (!is_valid_up && !is_valid_down && !is_valid_left && !is_valid_right) {
// Check if valid down
bool would_flip_oppenent = false;
bool has_other_end = false;
for (int i = move.row + 1; i < 8 && !has_other_end; i++) {
if (board[i][move.col] == current_player) {
has_other_end = true;
} else if (board[i][move.col] == other_color) {
would_flip_oppenent = true;
} else {
// We have reached an empty tile
break;
}
}
is_valid_down = has_other_end && would_flip_oppenent;
}
if (!is_valid_up && !is_valid_down && !is_valid_left && !is_valid_right) {
// Check if valid left
bool would_flip_oppenent = false;
bool has_other_end = false;
for (int i = move.col - 1; i > 0 && !has_other_end; i--) {
if (board[move.row][i] == current_player) {
has_other_end = true;
} else if (board[move.row][i] == other_color) {
would_flip_oppenent = true;
} else {
// We have reached an empty tile
break;
}
}
is_valid_left = has_other_end && would_flip_oppenent;
}
if (!is_valid_up && !is_valid_down && !is_valid_left && !is_valid_right) {
// Check if valid right
bool would_flip_oppenent = false;
bool has_other_end = false;
for (int i = move.col + 1; i < 8 && !has_other_end; i++) {
if (board[move.row][i] == current_player) {
has_other_end = true;
} else if (board[move.row][i] == other_color) {
would_flip_oppenent = true;
} else {
// We have reached an empty tile
break;
}
}
is_valid_right = has_other_end && would_flip_oppenent;
}
return is_valid_up || is_valid_down || is_valid_left || is_valid_right;
}
bool has_valid_moves(const enum player_color board[8][8],
const enum player_color current_player) {
bool result = false;
struct move move;
for (move.row = 0; move.row < 8 && !result; move.row++) {
for (move.col = 0; move.col < 8 && !result; move.col++) {
result = is_valid_move(board, current_player, move);
}
}
return result;
}
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