from typing import Any, Dict, Optional


def generate_simple_tests(config: Optional[Dict[str, Any]] = None):
    """Generate a simple set of test cases with optional configuration."""
    # Default values
    languages = ["Spanish", "French"]
    phrases = ["Hello", "Thank you"]

    # Override with config if provided
    if config:
        languages = config.get("languages", languages)
        phrases = config.get("phrases", phrases)

    test_cases = []
    for phrase in phrases:
        for lang in languages:
            test_case = {
                "vars": {"text": phrase, "target_language": lang},
                "assert": [
                    {"type": "regex", "value": ".+"}
                ],  # Just check for non-empty output
                "description": f"Translate '{phrase}' to {lang}",
            }
            test_cases.append(test_case)

    return test_cases


def generate_from_csv(config: Optional[Dict[str, Any]] = None):
    """Generate test cases from CSV data with optional row limit."""
    # Default test data
    data = {
        "source_text": ["Good morning", "Thank you", "Goodbye"],
        "target_language": ["French", "Spanish", "German"],
        "expected_translation": ["Bonjour", "Gracias", "Auf Wiedersehen"],
    }

    # Use custom data if provided in config
    if config and "data" in config:
        data = config["data"]

    columns = ("source_text", "target_language", "expected_translation")
    if not isinstance(data, dict) or any(column not in data for column in columns):
        raise ValueError(f"data must contain {', '.join(columns)}")
    values = [data[column] for column in columns]
    if any(not isinstance(column, (list, tuple)) for column in values):
        raise ValueError("data columns must be lists or tuples")
    if len({len(column) for column in values}) != 1:
        raise ValueError("data columns must have equal lengths")
    rows = [dict(zip(columns, row)) for row in zip(*values)]

    # Slicing preserves head(0) and negative head(n) behavior too.
    if config and "max_rows" in config:
        max_rows = config["max_rows"]
        if not isinstance(max_rows, int) or isinstance(max_rows, bool):
            raise ValueError("max_rows must be an integer")
        rows = rows[:max_rows]

    test_cases = []
    for row in rows:
        test_case = {
            "vars": {
                "text": row["source_text"],
                "target_language": row["target_language"],
            },
            "assert": [{"type": "contains", "value": row["expected_translation"]}],
            "description": f"Translate '{row['source_text']}' to {row['target_language']}",
        }
        test_cases.append(test_case)

    return test_cases