from backend.utils.csv_parser import parse_csv_questions


def test_parses_valid_csv():
    text = "question_text,difficulty\nWhat is Python?,easy\nExplain GIL,hard"
    result = parse_csv_questions(text)
    assert len(result) == 2
    assert result[0] == {"question_text": "What is Python?", "difficulty": "easy"}
    assert result[1] == {"question_text": "Explain GIL", "difficulty": "hard"}


def test_defaults_invalid_difficulty_to_medium():
    text = "question_text,difficulty\nWhat is Python?,bogus"
    result = parse_csv_questions(text)
    assert result[0]["difficulty"] == "medium"


def test_skips_empty_question_text():
    text = "question_text,difficulty\n,easy\nWhat is Python?,easy"
    result = parse_csv_questions(text)
    assert len(result) == 1


def test_missing_difficulty_column_defaults_to_medium():
    text = "question_text\nWhat is Python?"
    result = parse_csv_questions(text)
    assert result[0]["difficulty"] == "medium"


def test_empty_csv_returns_empty_list():
    text = "question_text,difficulty\n"
    result = parse_csv_questions(text)
    assert result == []


def test_strips_whitespace():
    text = "question_text,difficulty\n  What is Python?  ,  easy  "
    result = parse_csv_questions(text)
    assert result[0]["question_text"] == "What is Python?"
    assert result[0]["difficulty"] == "easy"