import os
import httpx
from dotenv import load_dotenv
from fastapi import FastAPI, UploadFile, File, HTTPException, Form
from fastapi.middleware.cors import CORSMiddleware
import uvicorn
from rfq_parser import parse_rfq_pdf, LLAMA_API_BASE_DEFAULT, LLAMA_MODEL_DEFAULT

load_dotenv()

app = FastAPI(title="Dynamic RFQ Parser")

app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

@app.post("/parse-rfq")
async def parse_rfq(
    file: UploadFile = File(...),
    provider: str = Form("gemini"),
):
    if not file.filename.endswith(".pdf"):
        raise HTTPException(status_code=400, detail="Only PDF files are supported")

    if provider not in ("gemini", "ollama", "llama", "none"):
        raise HTTPException(status_code=400, detail="provider must be 'gemini', 'ollama', 'llama', or 'none'")

    if provider == "gemini" and not os.getenv("GOOGLE_API_KEY"):
        raise HTTPException(status_code=500, detail="GOOGLE_API_KEY not configured")

    if provider == "ollama" and not os.getenv("OLLAMA_MODEL"):
        raise HTTPException(status_code=500, detail="OLLAMA_MODEL not configured")

    if provider == "llama":
        base_url = os.getenv("LLAMA_API_BASE", LLAMA_API_BASE_DEFAULT)
        try:
            resp = httpx.get(f"{base_url}/models", timeout=5)
            resp.raise_for_status()
        except Exception:
            raise HTTPException(status_code=503, detail=f"llama.cpp server not reachable at {base_url}")

    contents = await file.read()
    try:
        result = parse_rfq_pdf(contents, provider=provider)
        return result
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))

@app.get("/providers")
def list_providers():
    llama_base = os.getenv("LLAMA_API_BASE", LLAMA_API_BASE_DEFAULT)
    llama_model = os.getenv("LLAMA_MODEL", LLAMA_MODEL_DEFAULT)
    llama_available = False
    try:
        resp = httpx.get(f"{llama_base}/models", timeout=3)
        llama_available = resp.status_code == 200
    except Exception:
        pass

    return {
        "providers": [
            {
                "id": "gemini",
                "available": bool(os.getenv("GOOGLE_API_KEY")),
                "config": {"model": "gemini-2.5-pro"},
            },
            {
                "id": "ollama",
                "available": bool(os.getenv("OLLAMA_MODEL")),
                "config": {
                    "model": os.getenv("OLLAMA_MODEL", ""),
                    "host": os.getenv("OLLAMA_HOST", "http://localhost:11434"),
                },
            },
            {
                "id": "llama",
                "available": llama_available,
                "config": {
                    "base_url": llama_base,
                    "model": llama_model,
                },
            },
            {
                "id": "none",
                "available": True,
                "config": {},
            },
        ]
    }


@app.get("/health")
def health():
    return {"status": "ok"}

if __name__ == "__main__":
    port = int(os.getenv("PORT", "7860"))
    uvicorn.run("main:app", host="0.0.0.0", port=port)