#!/usr/bin/env python3
"""Manifest checker - validates presence of required artifact files."""

import json
import sys
from pathlib import Path


MANIFEST = {
    "artifacts": [
        "json_validator.py",
        "manifest_check.py"
    ],
    "version": "1.0"
}


def check_manifest(artifacts_dir: str) -> dict:
    """Check that all required artifacts exist."""
    base = Path(artifacts_dir)
    results = {
        "valid": True,
        "artifacts_dir": str(base),
        "expected": MANIFEST["artifacts"],
        "found": [],
        "missing": []
    }
    
    for artifact in MANIFEST["artifacts"]:
        path = base / artifact
        if path.exists():
            results["found"].append(artifact)
        else:
            results["missing"].append(artifact)
            results["valid"] = False
    
    return results


if __name__ == "__main__":
    if len(sys.argv) < 2:
        print("Usage: manifest_check.py <artifacts_dir>", file=sys.stderr)
        sys.exit(1)
    
    result = check_manifest(sys.argv[1])
    print(json.dumps(result, indent=2))
    sys.exit(0 if result["valid"] else 1)