from fastapi import FastAPI, HTTPException, Response
from utils.feed_generator import generate_feed_of_user, USER_NOT_FOUND, CANNOT_ACCESS_INSTANCE, INVALID_HANDLE

app = FastAPI()


@app.get("/feed/{user_handle}")
def get_feed_of_user(user_handle: str):
    feed = generate_feed_of_user(user_handle)

    if feed == USER_NOT_FOUND:
        return HTTPException(status_code=404, detail="The user cannot be found.")
    if feed == CANNOT_ACCESS_INSTANCE:
        return HTTPException(status_code=400, detail="Cannot access the instance.")
    if feed == INVALID_HANDLE:
        return HTTPException(status_code=400, detail="The handle is invalid.")
    
    return Response(content=feed, media_type="application/xml")