#!/usr/bin/env python3
import argparse
import json
import sys
from pathlib import Path

from james.lib.log import get_logger

log = get_logger("validate")


def load_json(path: Path | None) -> dict:
    if path is None:
        data = sys.stdin.read()
    else:
        data = path.read_text()
    return json.loads(data)


def main() -> int:
    parser = argparse.ArgumentParser(description="Validate a James event against the JSON schema")
    parser.add_argument("--schema", default="james/schemas/event.json")
    parser.add_argument("--file", help="Event JSON file (defaults to stdin)")
    args = parser.parse_args()

    try:
        import jsonschema
    except Exception as exc:  # pragma: no cover - runtime guard
        log.error("jsonschema is required", exc_info=True)
        return 2

    schema = json.loads(Path(args.schema).read_text())
    event = load_json(Path(args.file) if args.file else None)

    try:
        jsonschema.validate(instance=event, schema=schema)
    except jsonschema.ValidationError as exc:
        log.error("invalid event", error=exc.message)
        return 1

    log.info("valid")
    return 0


if __name__ == "__main__":
    raise SystemExit(main())