import pytest

from app.pool import PoolValidationError, get_question, parse_pool_json, public_question_payload, question_time_limit


def test_pool_validation_accepts_well_formed_pool(sample_pool):
    pool = parse_pool_json(sample_pool)
    assert pool["title"] == "Sample Quiz"
    assert pool["score_fn"] == "linear_decay"
    assert question_time_limit(pool, 0) == 2
    assert get_question(pool, 0)["correct"] == "B"
    public = public_question_payload(pool, 0)
    assert "correct" not in public
    assert public["options"]["A"] == "Alpha"


@pytest.mark.parametrize(
    "mutator, message",
    [
        (lambda p: p.pop("title"), "title"),
        (lambda p: p.update({"questions": []}), "at least one"),
        (lambda p: p["questions"][0].pop("text"), "text"),
        (lambda p: p["questions"][0].update({"options": {"A": "x"}}), "options"),
        (lambda p: p["questions"][0].update({"correct": "E"}), "correct"),
        (lambda p: p.update({"score_fn": "missing"}), "Unknown"),
        (lambda p: p.update({"time_limit_default": 0}), "positive"),
    ],
)
def test_pool_validation_rejects_invalid_shapes(sample_pool, mutator, message):
    mutator(sample_pool)
    with pytest.raises(PoolValidationError, match=message):
        parse_pool_json(sample_pool)


def test_pool_validation_rejects_invalid_json():
    with pytest.raises(PoolValidationError, match="Invalid JSON"):
        parse_pool_json("{bad")