"""Ensure runtime error_code values stay within the OpenAPI registry."""

from __future__ import annotations

import re
from pathlib import Path

import pytest

from app.core.error_codes import ALL_ERROR_CODES, ERROR_CODE_ENUM
from app.core.errors import (
    _STATUS_TO_ERROR_CODE,
    AppError,
    AuthenticationError,
    AuthorizationError,
    BadRequestError,
    ConflictError,
    GatewayTimeoutError,
    NotFoundError,
    ProviderError,
    QuotaExceededError,
    RateLimitedError,
    ServiceUnavailableError,
    ValidationError,
)
from app.features.auth.service_errors import _AUTH_CODE_MAP
from app.features.payment.payment_exceptions import _PAYMENT_CODE_MAP

_APP_FEATURES_ROOT = Path(__file__).resolve().parents[1] / "app" / "features"
_LITERAL_ERROR_CODE_RE = re.compile(r"""error_code\s*=\s*["']([A-Z][A-Z0-9_]*)["']""")


def _app_error_subclass_codes() -> set[str]:
    codes: set[str] = set()
    for cls in (
        NotFoundError,
        BadRequestError,
        AuthenticationError,
        AuthorizationError,
        ValidationError,
        ConflictError,
        ServiceUnavailableError,
        GatewayTimeoutError,
        ProviderError,
        QuotaExceededError,
        RateLimitedError,
    ):
        # Instantiate with defaults to read resolved error_code from AppError base.
        instance = cls()
        codes.add(instance.error_code)
    return codes


def _auth_runtime_codes() -> set[str]:
    return {external for _, external in _AUTH_CODE_MAP.values()}


def _payment_runtime_codes() -> set[str]:
    return {external for _, external in _PAYMENT_CODE_MAP.values()}


def _literal_feature_error_codes() -> set[str]:
    codes: set[str] = set()
    for path in _APP_FEATURES_ROOT.rglob("*.py"):
        text = path.read_text(encoding="utf-8")
        codes.update(_LITERAL_ERROR_CODE_RE.findall(text))
    return codes


def _runtime_error_codes() -> set[str]:
    return (
        _app_error_subclass_codes()
        | _auth_runtime_codes()
        | _payment_runtime_codes()
        | set(_STATUS_TO_ERROR_CODE.values())
        | _literal_feature_error_codes()
    )


def test_runtime_error_codes_are_registered_in_openapi_enum() -> None:
    runtime = _runtime_error_codes()
    registry = set(ERROR_CODE_ENUM)
    missing = runtime - registry
    assert not missing, f"Unregistered runtime error_code values: {sorted(missing)}"


def test_auth_and_payment_registry_http_status_matches_runtime_maps() -> None:
    registry_by_code = {entry["code"]: entry for entry in ALL_ERROR_CODES}
    for internal, (status_code, external) in {**_AUTH_CODE_MAP, **_PAYMENT_CODE_MAP}.items():
        if external not in registry_by_code:
            continue
        entry = registry_by_code[external]
        assert entry["http_status"] == status_code, (
            f"{internal} maps to {external} with HTTP {status_code}, "
            f"but registry lists {entry['http_status']}"
        )


@pytest.mark.parametrize(
    "error_cls,expected_code",
    [
        (NotFoundError, "NOT_FOUND"),
        (BadRequestError, "BAD_REQUEST"),
        (AuthenticationError, "AUTHENTICATION_FAILED"),
        (AuthorizationError, "FORBIDDEN"),
        (ValidationError, "VALIDATION_ERROR"),
        (ConflictError, "CONFLICT"),
        (ServiceUnavailableError, "SERVICE_UNAVAILABLE"),
        (GatewayTimeoutError, "GATEWAY_TIMEOUT"),
        (ProviderError, "PROVIDER_ERROR"),
        (QuotaExceededError, "QUOTA_EXCEEDED"),
        (RateLimitedError, "RATE_LIMITED"),
    ],
)
def test_app_error_subclasses_use_registered_codes(error_cls: type[AppError], expected_code: str) -> None:
    assert error_cls().error_code == expected_code
    assert expected_code in ERROR_CODE_ENUM