# Copyright (c) 2012 Andrei Grigorean, Mihnea Giurgea, Sonia Stan, MIT License
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

from digging_strategy import DiggingStrategy
from digger import Digger
from las_vegas import generate_terminal_pattern

def generate_sudoku_with_unique_solution(difficulty):
    """Generates a partially completed sudoku with a unique solution, of the
    given difficulty (1 through 5)."""
    # Generate a terminal pattern (fully completed sudoku)
    terminal_pattern = generate_terminal_pattern()
    # Instantiate a Digger instance for the selected difficulty.
    digging_strategy = DiggingStrategy(difficulty)
    digger = Digger(digging_strategy)

    sudoku = digger.dig_cells(terminal_pattern)
    return sudoku
