from pysmt.shortcuts import Symbol, Bool, Not, Implies, Iff, And, Or, AtMostOne, ExactlyOne, get_model, get_atoms, get_formula_size, get_unsat_core
from pysmt.rewritings import conjunctive_partition

colors = 'pbryg'
deck_str = 'p5 p3 b4 r5 y4 y4 y5 r4 b2 y2 y3 g5 g2 g3 g4 p4 r3 b2 b3 b3 p4 b1 p2 b1 b1 p2 p1 p1 g1 r4 g1 r1 r3 r1 g1 r1 p1 b4 p3 g2 g3 g4 b5 y1 y1 y1 r2 r2 y2 y3'
deck = [(s[0], int(s[1])) for s in deck_str.split(' ')]
MOVES = 52
NUM_STRIKES = 3

# clues[m][i] == "after move m we have at least i clues"
clues = {-1: {i: Bool(i < 9) for i in range(0, 10)}, **{m: {0: Bool(True), 9: Bool(False), **{i: Symbol('m{}c{}'.format(m, i)) for i in range(1, 9)}} for m in range(MOVES)}}
# strikes[m][i] == "after move m we have at least i strikes"
strikes = {-1: {i: Bool(i == 0) for i in range(0,NUM_STRIKES+1)}, **{m: {0: Bool(True), NUM_STRIKES: Bool(False), **{s: Symbol('m{}s{}'.format(m,s)) for s in range(1,NUM_STRIKES)}} for m in range(MOVES)} }
# strike[m] = "at move m we get a strike"
strike = {-1: Bool(False), **{m: Symbol('m{}s+'.format(m)) for m in range(MOVES)}}
# draw[m][i] == "at move m we draw deck[i]"
draw = {-1: {i: Bool(i == 19) for i in range(19, 50)}, **{m: {19: Bool(False), **{i: Symbol('m{}+{}'.format(m, i)) for i in range(20, 50)}} for m in range(MOVES)}}
# draw[m][i] == "at move m we play/discard deck[i]"
discard = {m: {i: Symbol('m{}-{}'.format(m, i)) for i in range(50)} for m in range(MOVES)}
# progress[m][c, k] == "after move m we have played in color c until k"
progress = {-1: {(c, k): Bool(k == 0) for c in colors for k in range(6)}, **{m: {**{(c, 0): Bool(True) for c in colors}, **{(c, k): Symbol('m{}:{}{}'.format(m, c, k)) for c in colors for k in range(1, 6)}} for m in range(MOVES)}}
# discard_any[m] == "at move m we play/discard a card"
discard_any = {m: Symbol('m{}d'.format(m)) for m in range(MOVES)}
# draw_any[m] == "at move m we draw a card"
draw_any = {m: Symbol('m{}D'.format(m)) for m in range(MOVES)}
# play[m] == "at move m we play a card"
play = {m: Symbol('m{}p'.format(m)) for m in range(MOVES)}
# play5[m] == "at move m we play a 5"
play5 = {m: Symbol('m{}p5'.format(m)) for m in range(MOVES)}
# incr_clues[m] == "at move m we obtain a clue"
incr_clues = {m: Symbol('m{}c+'.format(m)) for m in range(MOVES)}

def print_model(model):
    for m in range(MOVES):
        print('=== move {} ==='.format(m))
        print('clues: ' + ''.join(str(i) for i in range(1, 9) if model.get_py_value(clues[m][i])))
        print('strikes: ' + ''.join(str(i) for i in range(1, NUM_STRIKES) if model.get_py_value(strikes[m][i])))
        print('draw: ' + ', '.join('{} [{}{}]'.format(i, deck[i][0], deck[i][1]) for i in range(20, 50) if model.get_py_value(draw[m][i])))
        print('discard: ' + ', '.join('{} [{}{}]'.format(i, deck[i][0], deck[i][1]) for i in range(50) if model.get_py_value(discard[m][i])))
        for c in colors:
            print('progress {}: '.format(c) + ''.join(str(k) for k in range(1, 6) if model.get_py_value(progress[m][c, k])))
        flags = ['discard_any', 'draw_any', 'play', 'play5', 'incr_clues', 'strike']
        print(', '.join(f for f in flags if model.get_py_value(globals()[f][m])))

valid_move = lambda m: And(
    # definition of discard_any
    Iff(discard_any[m], Or(discard[m][i] for i in range(50))),
    # definition of draw_any
    Iff(draw_any[m], Or(draw[m][i] for i in range(20, 50))),
    # draw implies discard (and converse true before last 5 moves)
    (Iff if m < MOVES-5 else Implies)(draw_any[m], discard_any[m]),
    # play requires discard
    Implies(play[m], discard_any[m]),
    # definition of play5
    Iff(play5[m], And(play[m], Or(discard[m][i] for i in range(50) if deck[i][1] == 5))),
    # definition of incr_clues
    Iff(incr_clues[m], And(discard_any[m], Implies(play[m], And(play5[m], Not(clues[m-1][8]))))),
    #Iff(incr_clues[m], And(discard_any[m], Implies(play[m], play5[m]))),
    # change of clues
    *[Iff(clues[m][i], Or(clues[m-1][i+1], And(clues[m-1][i], discard_any[m]), And(clues[m-1][i-1], incr_clues[m]))) for i in range(1, 9)],
    ## more than 8 clues not allowed (TODO: not really. 2x we can deliberately play unplayable card to discard it)
    Iff(strike[m], And(discard_any[m], Not(play[m]), clues[m-1][8])),
    # change of strikes
    *[Iff(strikes[m][i], Or(strikes[m-1][i], And(strikes[m-1][i-1], strike[m]))) for i in range(1, NUM_STRIKES+1)],
    # less than 0 clues not allowed
    Implies(Not(discard_any[m]), clues[m-1][1]),
    # we can only draw card i if the last drawn card was i-1
    *[Implies(draw[m][i], Or(And(draw[m0][i-1], *[Not(draw_any[m1]) for m1 in range(m0+1, m)]) for m0 in range(max(-1, m-9), m))) for i in range(20, 50)],
    #*[Implies(draw[m][i], Not(draw[m0][i])) for m0 in range(m) for i in range(20, 50)],
    #*[Implies(draw[m][i], Or(draw[m0][i-1] for m0 in range(max(-1, m-9), m))) for i in range(20, 50)],
    # we can only draw at most one card (NOTE: redundant, FIXME: avoid quadratic formula)
    AtMostOne(draw[m][i] for i in range(20, 50)),
    #*[Not(And(draw[m][i], draw[m][j])) for i in range(20, 50) for j in range(20, i)],
    # we can only discard a card if we drew it earlier...
    *[Implies(discard[m][i], Or(draw[m0][i] for m0 in range(m-5, -1, -5))) for i in range(20, 50)],
    # ...or if it was part of the initial hand
    *[Not(discard[m][i]) for i in range(20) if i//4 != m%5],
    # we can only discard a card if we did not discard it yet
    *[Implies(discard[m][i], And(Not(discard[m0][i]) for m0 in range(m-5, -1, -5))) for i in range(50)],
    # we can only discard at most one card (FIXME: avoid quadratic formula)
    AtMostOne(discard[m][i] for i in range(50)),
    #*[Not(And(discard[m][i], discard[m][j])) for i in range(50) for j in range(i)],
    # we can only play a card if it matches the progress
    *[Implies(And(discard[m][i], play[m]), And(Not(progress[m-1][deck[i]]), progress[m-1][deck[i][0], deck[i][1]-1])) for i in range(50)],
    # change of progress
    *[Iff(progress[m][c, k], Or(progress[m-1][c, k], And(play[m], Or(discard[m][i] for i in range(50) if deck[i] == (c, k))))) for c in colors for k in range(1, 6)]
)

win = And(
    # maximum progress at each color
    *[progress[MOVES-1][c, 5] for c in colors],
    # played every color/value combination (NOTE: redundant)
    *[Or(And(discard[m][i], play[m]) for m in range(MOVES) for i in range(50) if deck[i] == (c, k)) for c in colors for k in range(1, 6)]
)

constraints = And(*[valid_move(m) for m in range(MOVES)], draw[MOVES-6][49], win)
print('{} variables, {} nodes'.format(len(get_atoms(constraints)), get_formula_size(constraints)))

model = get_model(constraints)
if model:
    print_model(model)
else:
    print('unsatisfiable')
    #conj = list(conjunctive_partition(constraints))
    #print('statements: {}'.format(len(conj)))
    #ucore = get_unsat_core(conj)
    #print('unsat core size: {}'.format(len(ucore)))
    #for f in ucore:
    #    print(f.serialize())