import json
from functools import lru_cache
from pathlib import Path

import jsonschema
from jsonschema import Draft202012Validator

from app.config import get_settings


@lru_cache
def get_event_validator() -> Draft202012Validator:
    path = Path(get_settings().event_schema_path)
    if not path.is_file():
        path = Path(__file__).resolve().parents[3] / "schemas" / "event-schema-v1.json"
    schema = json.loads(path.read_text(encoding="utf-8"))
    Draft202012Validator.check_schema(schema)
    return Draft202012Validator(schema)


def validate_event_payload(payload: dict) -> list[str]:
    validator = get_event_validator()
    errors = sorted(validator.iter_errors(payload), key=lambda e: e.path)
    return [e.message for e in errors]