"""
Multi-factor A-share stock screening engine.

Usage: python3 stock_screener.py <function> <json_args>
"""

import sys
import json


def multi_factor(strategy="comprehensive", sector=None, market_cap="all", top_n=10):
    """Multi-factor scoring screen. Stub - to be implemented."""
    return json.dumps({
        "status": "stub",
        "message": f"Multi-factor screen (strategy={strategy}, sector={sector}) — not yet implemented",
        "strategy": strategy,
        "results": [],
    }, ensure_ascii=False)


def strong(sector=None, top_n=20):
    """Strong trend screen. Stub - to be implemented."""
    return json.dumps({
        "status": "stub",
        "message": "Strong trend screen — not yet implemented",
        "results": [],
    }, ensure_ascii=False)


def breakout(lookback_days=60, top_n=20):
    """Volume breakout screen. Stub - to be implemented."""
    return json.dumps({
        "status": "stub",
        "message": f"Breakout screen ({lookback_days}d) — not yet implemented",
        "results": [],
    }, ensure_ascii=False)


def oversold(top_n=20):
    """Oversold rebound screen. Stub - to be implemented."""
    return json.dumps({
        "status": "stub",
        "message": "Oversold screen — not yet implemented",
        "results": [],
    }, ensure_ascii=False)


FUNCTIONS = {
    "multi_factor": multi_factor,
    "strong": strong,
    "breakout": breakout,
    "oversold": oversold,
}

if __name__ == "__main__":
    if len(sys.argv) < 2:
        print("Usage: stock_screener.py <function> [json_args]")
        sys.exit(1)

    func_name = sys.argv[1]
    args = json.loads(sys.argv[2]) if len(sys.argv) > 2 else {}

    if func_name not in FUNCTIONS:
        print(f"Unknown function: {func_name}")
        sys.exit(1)

    result = FUNCTIONS[func_name](**args)
    print(result)