import pytest

from flashcards import scheduler_brutal
from flashcards.scheduler_brutal import SchedulerBrutal as UUT
from flashcards.card import Card

# Force HISTORY_DEPTH to simplify testing
scheduler_brutal.HISTORY_DEPTH = 3

#--------------------------------------------------------------------------
# Scheduling behaviour
#--------------------------------------------------------------------------
def test_scheduling():
    cards = {str(id): Card("", "") for id in range(0, 10)}
    state = {
        "0": [1, 1, 1],
        "1": [0, 0, 0],
        "2": [0, 0, 1],
        "3": [1, 0, 0],

        "4": [None, None, 1   ],
        "5": [None, 1,    None],
        "6": [1,    None, None],
        "7": [None, None, 0   ],
        "8": [0,    0,    None],
        "9": [None, None, None],
    }

    expected_priority = ["9", "6", "5", "7", "8", "4", "1", "3", "2", "0"]

    uut = UUT(cards, state)

    for i in range(0, len(expected_priority)):
        assert set(uut.practice(i + 1)) == set(expected_priority[0:i + 1])

#--------------------------------------------------------------------------
# State update
#--------------------------------------------------------------------------
def test_stateUpdate():
    cards = {"0": Card("f", "b"), "1": Card("a", "b"), "2": Card("c", "d")}
    state = {"0": [1, 0, 1], "1": [1, 0, 0], "2": [0, 0, 1]}

    uut = UUT(cards, state)

    # Unknown IDs in the result are silently ignored
    result = {"0": 1, "1": 0, "3": 0}
    expected_state = {"0": [0, 1, 1], "1": [0, 0, 0], "2": [0, 1, None]}

    uut.update(result)

    assert uut.getState() == expected_state

#--------------------------------------------------------------------------
# State corrections
#--------------------------------------------------------------------------
def test_stateWhenCardsChanged():
    cards = {"0": Card("f", "b"), "1": Card("a", "b")}

    initial_state = {"0": [1, 0, 1], "2": [0, 0, 0]}
    expected_state = {"0": [1, 0, 1], "1": [None, None, None]}

    uut = UUT(cards, initial_state)

    assert uut.getState() == expected_state

def test_stateWhenHistoryDepthIncreased():
    scheduler_brutal.HISTORY_DEPTH = 5

    cards = {"0": Card("f", "b"), "1": Card("a", "b"), "2": Card("new", "new")}

    initial_state = {"0": [1, 0, 1], "1": [0, 0, 0]}
    expected_state = {"0": [None, None, 1, 0, 1], "1": [None, None, 0, 0, 0], "2": [None] * 5}

    uut = UUT(cards, initial_state)

    assert uut.getState() == expected_state

def test_stateWhenHistoryDepthDecreased():
    scheduler_brutal.HISTORY_DEPTH = 1

    cards = {"0": Card("f", "b"), "1": Card("a", "b"), "2": Card("new", "new")}

    initial_state = {"0": [1, 0, 0], "1": [0, 0, 1]}
    expected_state = {"0": [0], "1": [1], "2": [None]}

    uut = UUT(cards, initial_state)

    assert uut.getState() == expected_state