main.py

from fastapi import FastAPI, HTTPException
from fastapi.middleware.cors import CORSMiddleware
import feedparser
import httpx
import asyncio
import uvicorn

app = FastAPI()

app.add_middleware(
    CORSMiddleware,
    allow_origins=["http://localhost:3000", "http://127.0.0.1:3000"],
    allow_methods=["*"],
    allow_headers=["*"],
)

FEEDS = {
    "XDA": "https://www.xda-developers.com/feed/",
    "Polygon": "https://www.polygon.com/feed/"
}

# Spoof a real browser to avoid bot blocking
HEADERS = {
    "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36",
    "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8",
    "Accept-Language": "en-US,en;q=0.5",
    "Accept-Encoding": "gzip, deflate",
    "Connection": "keep-alive",
}

async def fetch_feed(url: str) -> str:
    """Fetch RSS feed content with retry logic."""
    async with httpx.AsyncClient(headers=HEADERS, timeout=10.0) as client:
        for attempt in range(3):
            try:
                response = await client.get(url)
                response.raise_for_status()
                return response.text
            except (httpx.RequestError, httpx.HTTPStatusError) as e:
                if attempt == 2:
                    raise HTTPException(status_code=502, detail=f"Failed to fetch {url} after 3 attempts: {str(e)}")
                await asyncio.sleep(1)

@app.get("/api/news")
async def get_news():
    all_news = []
    for source, url in FEEDS.items():
        try:
            # Fetch raw XML with resilient HTTP
            xml_content = await fetch_feed(url)
            # Parse locally (no network call in feedparser)
            feed = feedparser.parse(xml_content)
            
            for entry in feed.entries[:10]:
                is_tech = any(x in entry.title.lower() for x in ['windows', 'dev', 'chip', 'gpu', 'ai', 'api'])
                all_news.append({
                    "source": source,
                    "title": entry.title,
                    "link": entry.link,
                    "summary": entry.get('summary', '').replace('\n', ' ')[:200] + "...",
                    "is_tech": is_tech,
                    "published": entry.get('published', '')
                })
        except Exception as e:
            # Log error but don't crash — skip bad feed
            print(f"[ERROR] Skipping {source} feed: {e}")
            continue
    
    if not all_news:
        raise HTTPException(status_code=503, detail="No feeds could be retrieved. Check network or feed URLs.")
    
    return all_news


@app.get("/api/health")
async def health_check():
    return {
        "status": "ok",
        "backend": "running",
        "feeds": list(FEEDS.keys()),
        "timestamp": "2025-12-20T12:00:00Z"  # placeholder
    }

if __name__ == "__main__":
    import os
    port = int(os.environ.get("PORT", 8000))
    uvicorn.run(app, host="0.0.0.0", port=port, log_level="info")