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app.py

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+"""
+FinWise — FastAPI backend for HuggingFace Spaces
+-------------------------------------------------
+• Serves all static HTML/CSS/JS files from the same directory
+• /api/quotes?symbols=NVDA,AAPL,MSFT   → live quotes via yfinance
+• /api/chart?symbol=NVDA&days=8        → daily closes for sparkline
+• Full CORS enabled so the browser JS can call these endpoints freely
+• Runs on port 7860 (HuggingFace default)
+"""
+
+import os
+import json
+from pathlib import Path
+from typing import List
+
+import yfinance as yf
+from fastapi import FastAPI, Query, HTTPException
+from fastapi.middleware.cors import CORSMiddleware
+from fastapi.staticfiles import StaticFiles
+from fastapi.responses import FileResponse, JSONResponse
+import uvicorn
+
+# ── App ───────────────────────────────────────────────────────────────────────
+app = FastAPI(title="FinWise API", docs_url="/api/docs")
+
+# Allow all origins (the page is served from the same Space, but be permissive)
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=["*"],
+    allow_methods=["GET"],
+    allow_headers=["*"],
+)
+
+# ── Helpers ──────────────────────────────────────────────────────────────────
+def safe_float(val, decimals: int = 2):
+    """Return a rounded float or None if value is NaN / missing."""
+    try:
+        v = float(val)
+        if v != v:   # NaN check
+            return None
+        return round(v, decimals)
+    except Exception:
+        return None
+
+
+# ── Routes ───────────────────────────────────────────────────────────────────
+
+@app.get("/api/quotes")
+def get_quotes(symbols: str = Query(..., description="Comma-separated tickers, e.g. NVDA,AAPL")):
+    """
+    Returns a dict keyed by ticker symbol:
+      { "NVDA": { "price": 875.24, "chg1d": 2.4, "vol": 45000000 }, ... }
+    """
+    tickers = [t.strip().upper() for t in symbols.split(",") if t.strip()]
+    if not tickers:
+        raise HTTPException(status_code=400, detail="No valid symbols provided")
+    if len(tickers) > 30:
+        raise HTTPException(status_code=400, detail="Max 30 symbols per request")
+
+    try:
+        # yfinance batch download — fast_info is the lightest call
+        data = yf.Tickers(" ".join(tickers))
+        result = {}
+        for sym in tickers:
+            try:
+                t   = data.tickers[sym]
+                fi  = t.fast_info          # lightweight, no extra HTTP round-trip
+                result[sym] = {
+                    "price": safe_float(fi.last_price),
+                    "chg1d": safe_float(fi.last_price / fi.previous_close * 100 - 100)
+                              if fi.previous_close else None,
+                    "vol":   int(fi.three_month_average_volume or 0) or None,
+                    "prev":  safe_float(fi.previous_close),
+                    "high":  safe_float(fi.day_high),
+                    "low":   safe_float(fi.day_low),
+                }
+            except Exception:
+                result[sym] = {"price": None, "chg1d": None, "vol": None}
+
+        return JSONResponse(content=result)
+
+    except Exception as e:
+        raise HTTPException(status_code=502, detail=f"yfinance error: {str(e)}")
+
+
+@app.get("/api/chart")
+def get_chart(symbol: str = Query(...), days: int = Query(default=8, ge=2, le=30)):
+    """
+    Returns daily closing prices for the last `days` trading days.
+    Used for sparklines.
+      { "symbol": "NVDA", "closes": [820.1, 835.4, ...] }
+    """
+    sym = symbol.strip().upper()
+    try:
+        hist = yf.Ticker(sym).history(period=f"{days}d", interval="1d")
+        closes = [safe_float(v) for v in hist["Close"].tolist() if v == v]
+        closes = [c for c in closes if c is not None]
+        return JSONResponse(content={"symbol": sym, "closes": closes[-7:]})
+    except Exception as e:
+        raise HTTPException(status_code=502, detail=f"yfinance chart error: {str(e)}")
+
+
+@app.get("/api/health")
+def health():
+    return {"status": "ok", "service": "FinWise API"}
+
+
+# ── Serve static files (HTML/CSS/JS) ─────────────────────────────────────────
+# All .html files in the same directory are served directly.
+# The root "/" returns index.html.
+BASE_DIR = Path(__file__).parent
+
+@app.get("/")
+def root():
+    return FileResponse(BASE_DIR / "index.html")
+
+# Mount everything else as static — CSS, JS, other HTML pages
+# We do this AFTER the API routes so /api/* is not caught by StaticFiles
+app.mount("/", StaticFiles(directory=str(BASE_DIR), html=True), name="static")
+
+
+# ── Entry point ─────��─────────────────────────────────────────────────────────
+if __name__ == "__main__":
+    port = int(os.environ.get("PORT", 7860))
+    uvicorn.run("app:app", host="0.0.0.0", port=port, reload=False)

requirements.txt

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+fastapi==0.111.0
+uvicorn[standard]==0.29.0
+yfinance==0.2.40
+pandas==2.2.2
+requests==2.31.0