from fastapi import FastAPI, HTTPException, Request
from fastapi.encoders import jsonable_encoder
from fastapi.exceptions import RequestValidationError
from fastapi.responses import JSONResponse
from starlette import status
from starlette.exceptions import HTTPException as StarletteHTTPException

app = FastAPI()


@app.exception_handler(StarletteHTTPException)
async def http_exception_handler(request: Request, exc: StarletteHTTPException):
    """
    Handles all HTTPException (Starlette) errors.
    Returns a JSON response with status code and detail.
    """
    return JSONResponse(status_code=exc.status_code, content={"message": exc.detail})


@app.exception_handler(RequestValidationError)
async def validation_exception_handler(request: Request, exc: RequestValidationError):
    """
    Handles validation errors for request data.
    Returns a JSON response with 400 status and error details.
    """
    return JSONResponse(
        status_code=status.HTTP_400_BAD_REQUEST,
        content=jsonable_encoder({"errors": exc.errors(), "body": exc.body}),
    )


@app.get("/items/{item_id}")
async def read_item(item_id: int):

    if item_id == 3:
        raise HTTPException(status_code=418, detail="Nope! I don't like 3.")
    return {"item_id": item_id}