app/main.py

from fastapi import FastAPI, HTTPException
from app.schemas import PromptRequest, JsonResponse
from app.models import ProjectModel
import openai # یا هر API که برای مدل استفاده می‌کنید

app = FastAPI(title="BIM Prompt-to-JSON Engine")

SYSTEM_PROMPT_TEMPLATE = """
You are a BIM Modeler. Convert the user's description into a structured JSON.
Follow this exact schema:
{
  "project_metadata": {"name": "", "level": "", "unit": "meter"},
  "elements": [
    {"id": "", "type": "", "position": {"x":0, "y":0, "z":0}, "dimensions": {"l":0, "w":0, "h":0}, "material": "", "desc": ""}
  ]
}
"""

@app.post("/generate-bim-json", response_model=JsonResponse)
async def generate_bim_json(request: PromptRequest):
    try:
        # ترکیب پرامپت کاربر با دستورات سیستمی ما
        full_prompt = f"{SYSTEM_PROMPT_TEMPLATE}\n\nUser Description: {request.user_prompt}"
        
        # فراخوانی مدل (مثلاً GPT-5.5)
        response = await openai.ChatCompletion.acreate(
            model="gpt-5.5", # یا مدل مورد نظر شما
            messages=[
                {"role": "system", "content": "You are a precise JSON generator."},
                {"role": "user", "content": full_prompt}
            ],
            response_format={ "type": "json_object" }
        )
        
        # استخراج JSON از پاسخ مدل
        generated_json = response.choices[0].message.content
        
        return JsonResponse(status="success", data=generated_json)
    
    except Exception as e:
        raise HTTPException(status_code=500, detail=str(e))

@app.get("/")
async def read_root():
    return {"message": "BIM Engine is running. Use /docs for API documentation."}