"""
LifeOS — OpenEnv YAML Validator
===============================
Validates that openenv.yaml contains all required fields for the
OpenEnv hackathon submission.

Usage:
    python validate_yaml.py
"""
import sys
from pathlib import Path
try:
    import yaml
except ImportError:
    print("[FAIL] pyyaml is not installed. Install with: pip install pyyaml")
    sys.exit(1)

REQUIRED_FIELDS = [
    "name",
    "version",
    "description",
    "entry_point",
    "action_space",
    "observation_space",
    "reward_range",
    "tags",
    "author",
    "huggingface_repo"
]

def main():
    root = Path(__file__).resolve().parent
    yaml_path = root / "openenv.yaml"

    if not yaml_path.exists():
        print(f"[FAIL] openenv.yaml not found at {yaml_path}")
        sys.exit(1)

    with open(yaml_path, "r", encoding="utf-8") as f:
        try:
            data = yaml.safe_load(f)
        except yaml.YAMLError as e:
            print(f"[FAIL] openenv.yaml is not valid YAML:\n{e}")
            sys.exit(1)
            
    if not isinstance(data, dict):
        print("[FAIL] openenv.yaml must be a dictionary at the top level")
        sys.exit(1)

    missing = []
    for field in REQUIRED_FIELDS:
        if field not in data:
            missing.append(field)

    if missing:
        print("[FAIL] openenv.yaml is missing required fields:")
        for m in missing:
            print(f"  - {m}")
        sys.exit(1)

    print("[OK] openenv.yaml is valid and contains all required fields.")
    sys.exit(0)

if __name__ == "__main__":
    main()