#!/usr/bin/python3
# -*- coding: utf-8 -*-

"""
:mod: module
:author: `Éric W`
:date: 2016, october


"""



def usage():
    print('Usage: {:s} <bdd>'.format(sys.argv[0]))
    print('where')
    print('\t<bdd> is a text file whose lines are valid sudoku grids descriptions')
    exit(1)
    
if __name__ == '__main__':
    import sys
    import sudoku_grid, sudoku_solver


    if len(sys.argv) != 2:
        print('Argument missing.')
        usage()
    else:
        filename = sys.argv[1]
        try:
            with open(filename, 'r') as input:
                lines = input.readlines()
        except FileNotFoundError:
            print('No such file {:s}'.format(filename))
            usage()
        with open(filename+'.sol', 'w') as output:
            for line in lines:
                line = line.rstrip('\n')
                output.write(line + ':')
                strgrid = line.split(':')[-1]
                grid = sudoku_grid.SudokuGrid(strgrid)
                sols = sudoku_solver.solve(grid)
                nb_sols = len(sols)
                if nb_sols == 1:
                    output.write('y:')
                else:
                    output.write('n:')
                sols = ':'.join(str(sol) for sol in sols)
                output.write(sols + '\n')
        
    exit(0)