from fastapi import FastAPI, Request, Header, HTTPException
from fastapi.responses import JSONResponse, Response, StreamingResponse
import httpx
import socket
import asyncio

app = FastAPI()

REAL_API_KEY = "sk-94NDKhKQkhKoYnY65mg4NAIFK5BqNiCtxo8u3PsDpb0IucZt"  # Replace this with your actual key
BASE_URL = "https://fast.typegpt.net"
PUBLIC_AUTH_TOKEN = "TypeGPT-Free4ALL"

@app.on_event("startup")
async def startup_event():
    try:
        hostname = socket.gethostname()
        server_ip = socket.gethostbyname(hostname)
        print("===== Server Started =====")
        print(f"📡 Server IP: {server_ip}")
    except Exception as e:
        print(f"⚠️ Could not determine server IP: {e}")

@app.api_route("/{path:path}", methods=["GET", "POST"])
async def proxy(request: Request, path: str, authorization: str = Header(None)):
    if not authorization or not authorization.startswith("Bearer "):
        raise HTTPException(status_code=401, detail="Missing or malformed Authorization header.")

    token = authorization.replace("Bearer ", "").strip()
    if token != PUBLIC_AUTH_TOKEN:
        raise HTTPException(status_code=401, detail="Invalid Authorization token. Use 'TypeGPT-Free4ALL'.")

    target_url = f"{BASE_URL}/{path}"

    headers = {
        "Authorization": f"Bearer {REAL_API_KEY}",
        "Content-Type": request.headers.get("content-type", "application/json"),
        "Accept": "application/json",
        "User-Agent": "FastAPI-Proxy"
    }

    body = await request.body()

    # Detect stream mode
    is_stream = b'"stream":true' in body or b'"stream": true' in body

    print(f"🔄 Forwarding to: {target_url}")
    print(f"📦 Request Body (first 200 chars): {body[:200]}")
    print(f"🔁 Stream mode: {is_stream}")

    async with httpx.AsyncClient(timeout=60) as client:
        try:
            response = await client.request(
                method=request.method,
                url=target_url,
                headers=headers,
                content=body,
                stream=is_stream,
            )
        except httpx.RequestError as e:
            raise HTTPException(status_code=502, detail=f"Backend request failed: {e}")

        if is_stream:
            async def event_generator():
                async for chunk in response.aiter_bytes():
                    yield chunk

            return StreamingResponse(event_generator(), status_code=response.status_code, media_type="text/event-stream")

        # For non-streamed response
        try:
            return JSONResponse(content=response.json(), status_code=response.status_code)
        except Exception:
            return Response(
                content=response.content,
                status_code=response.status_code,
                media_type=response.headers.get("content-type", "text/plain")
            )