from fastapi import FastAPI, Response, HTTPException
from fastapi.responses import HTMLResponse
from fastapi.middleware.cors import CORSMiddleware
import edge_tts
import tempfile
import os

app = FastAPI()

# Allow CORS for Next.js to call directly or Server-to-Server
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_methods=["*"],
    allow_headers=["*"],
)

@app.get("/")
def read_root():
    # Automatically serve the HTML Tester UI if it exists alongside the server script
    html_path = os.path.join(os.path.dirname(__file__), "index.html")
    if os.path.exists(html_path):
        with open(html_path, "r", encoding="utf-8") as f:
            return HTMLResponse(content=f.read())
    return {"status": "Edge TTS Proxy is running securely"}

@app.get("/tts")
async def generate_tts(text: str, voice: str = "en-US-JennyNeural", rate: str = "+0%"):
    if not text:
        raise HTTPException(status_code=400, detail="Missing text parameter")
        
    try:
        # edge-tts python library natively bypasses 403 API IP Bans automatically!
        communicate = edge_tts.Communicate(text, voice, rate=rate)
        
        with tempfile.NamedTemporaryFile(suffix=".mp3", delete=False) as fp:
            temp_path = fp.name
            
        await communicate.save(temp_path)
        
        with open(temp_path, "rb") as f:
            audio_data = f.read()
            
        os.remove(temp_path)
        
        return Response(content=audio_data, media_type="audio/mpeg")
    except Exception as e:
        print(f"Server Error during TTS synthesis: {e}")
        raise HTTPException(status_code=500, detail=str(e))

if __name__ == "__main__":
    import uvicorn
    # Important: Cloud hosts like Render inject the dynamic port into PORT env var
    port = int(os.environ.get("PORT", 8000))
    uvicorn.run(app, host="0.0.0.0", port=port)