from typing import Any

from fastapi import FastAPI, Request
from fastapi.responses import JSONResponse


class AppError(Exception):
    def __init__(
        self,
        code: str,
        message: str,
        status_code: int = 400,
        details: dict[str, Any] | None = None,
    ) -> None:
        super().__init__(message)
        self.code = code
        self.message = message
        self.status_code = status_code
        self.details = details


def install_error_handlers(app: FastAPI) -> None:
    @app.exception_handler(AppError)
    async def handle_app_error(_request: Request, exc: AppError) -> JSONResponse:
        body: dict[str, Any] = {"error": {"code": exc.code, "message": exc.message}}
        if exc.details is not None:
            body["error"]["details"] = exc.details
        return JSONResponse(status_code=exc.status_code, content=body)