#ifndef CHESS_PATHS_H_INCLUDED
#define CHESS_PATHS_H_INCLUDED

enum chess_piece { KING, QUEEN, ROOK, BISHOP, KNIGHT, PAWN };

/* Implemented by the application: */
struct chessboard; 

int value_at(const struct chessboard * c, unsigned column, unsigned row);
unsigned int columns(const struct chessboard * c);
unsigned int rows(const struct chessboard * c);

struct piece_position {
    enum chess_piece piece;
    unsigned int column;
    unsigned int row;
};

/* Implemented by you: */
unsigned int increasing_path_len(const struct chessboard * c, struct piece_position * p);
unsigned int decreasing_path_len(const struct chessboard * c, struct piece_position * p);
unsigned int simple_path_len(const struct chessboard * c, struct piece_position * p);

#endif