import requests
import json
import logging
import time
import aiohttp
from fastapi import FastAPI, Header, Request, Query, HTTPException
from fastapi.responses import JSONResponse
from contextlib import asynccontextmanager

logging.basicConfig(level=logging.INFO)


@asynccontextmanager
async def lifespan(_app: FastAPI):
    async with aiohttp.ClientSession(
        "https://ip.shronk.tech",
        connector=aiohttp.TCPConnector(limit=2048),
        raise_for_status=True
    ) as client:
        _app.state.session = client
        yield


app = FastAPI(lifespan=lifespan)
app.state.cache = {}


async def make_request(ip: str, headers: dict[str, str]) -> dict | HTTPException:
    try:
        async with app.state.session.get(f"/lookup?ip={ip}") as response:
            data = await response.json()
    except json.JSONDecodeError as e:
        logging.error("Failed to parse data for %s: %s", ip, e, exc_info=True)
        return HTTPException(500, "Failed to parse upstream response.")
    except Exception as e:
        logging.error("Failed to get data for %s: %s", ip, e, exc_info=True)
        return HTTPException(500, "Failed to get upstream data.")
    return data

@app.get("/")
async def ip(
    request: Request,
    X_Forwarded_For: str = Header(None),
    User_Agent: str = Header("Mozilla/5.0"),
    lookup: str = Query(None),
):
    if lookup:
        ip = lookup
    elif X_Forwarded_For:
        ip = X_Forwarded_For
    else:
        ip = request.client.host

    if ip in app.state.cache:
        data, timestamp = app.state.cache[ip]
        if time.time() - timestamp < 3600:
            logging.info("cache hit for %s", ip)
            return JSONResponse(data)
        logging.info("cache expired for %s", ip)

    logging.info("looking up IP info for %s", ip)
    result = await make_request(
        ip,
        {"User-Agent": User_Agent}
    )
    if isinstance(result, HTTPException):
        return result
    logging.info("%s -> %r", ip, data)
    data["ip"] = ip
    data.pop("legalese", None)
    data.pop("source", None)
    data.pop("brexitRequired", None)
    app.state.cache[ip] = [data, time.time()]
    return JSONResponse(data)


@app.get("/lookup")
async def lookup(ip: str = Query(...), User_Agent: str = Header("Mozilla/5.0")):
    if ip in app.state.cache:
        data, timestamp = app.state.cache[ip]
        if time.time() - timestamp < 3600:
            logging.info("cache hit for %s", ip)
            return JSONResponse(data)
        logging.info("cache expired for %s", ip)

    logging.info("looking up IP info for %s", ip)
    result = await make_request(
        ip,
        {"User-Agent": User_Agent}
    )
    if isinstance(result, HTTPException):
        return result
    logging.info("%s -> %r", ip, data)
    data["ip"] = ip
    data.pop("legalese", None)
    data.pop("source", None)
    data.pop("brexitRequired", None)
    app.state.cache[ip] = [data, time.time()]
    return JSONResponse(data)