// The puzzle represents a Sudoku board where some cells may still be empty.
//
// All solve failures and inconsistencies are handled by crashing the program
// -- if puzzle_solve completes, then solved_board contains a copy of 
// input_board where every blank tile is now set to some digit value.

#ifndef PUZZLE_H
#define PUZZLE_H

#include <stdint.h>
#include "shared.h"
#include "puzzle_options.h"

typedef struct {
    tile_t input_board[N_CELLS];
    tile_t solved_board[N_CELLS];
    puzzle_options_t options[N_CELLS];
} puzzle_t;


// Create a puzzle whose input board is as given.
//
// You probably want puzzle_init_string from puzzle_io.h instead..
void puzzle_init(puzzle_t* puzzle, const tile_t board[N_CELLS]);

// Solve the puzzle.
//
// If this returns, the puzzle is solved. (Otherwise, we crash the process.)
void puzzle_solve(puzzle_t* puzzle);

#endif