"""HTTP error helpers."""

from typing import Any

from fastapi import Request
from fastapi.exceptions import RequestValidationError
from fastapi.responses import JSONResponse
from starlette import status


class AppError(Exception):
    def __init__(
        self,
        code: str,
        message: str,
        *,
        status_code: int = status.HTTP_400_BAD_REQUEST,
        details: dict[str, Any] | None = None,
    ) -> None:
        self.code = code
        self.message = message
        self.status_code = status_code
        self.details = details or {}


def error_response(
    code: str, message: str, status_code: int, details: dict[str, Any] | None = None
):
    return JSONResponse(
        status_code=status_code,
        content={"error": {"code": code, "message": message, "details": details or {}}},
    )


async def app_error_handler(_request: Request, exc: AppError) -> JSONResponse:
    return error_response(exc.code, exc.message, exc.status_code, exc.details)


async def validation_error_handler(_request: Request, exc: RequestValidationError) -> JSONResponse:
    return error_response(
        "validation_error",
        "Request validation failed",
        status.HTTP_422_UNPROCESSABLE_ENTITY,
        {"fields": exc.errors()},
    )