from fastapi import FastAPI, UploadFile, File, HTTPException
from fastapi.responses import JSONResponse
from pydantic import BaseModel
from PIL import Image
import io
import os
import google.generativeai as genai
from fastapi.responses import FileResponse
from pdf_generator import create_receipt


genai.configure(api_key=os.environ.get("GOOGLE_API_KEY"))

app = FastAPI()

class OCRResponse(BaseModel):
    extracted_text: str

@app.post("/ocr-image/", response_model=OCRResponse)
async def ocr_image(file: UploadFile = File(...)):
    
    if not file.content_type.startswith("image/"):
        raise HTTPException(status_code=400, detail="Uploaded file must be an image.")

    try:
        image_data = await file.read()
        image = Image.open(io.BytesIO(image_data))

    
        model = genai.GenerativeModel('gemini-2.0-flash')

        prompt = "Extraire le texte de cette image et générer un reçu à propos les marchandises et donner sous forme d'une facture professionnelle. sans aucune information supplémentaire."
        contents = [prompt, image]

        response = model.generate_content(contents)

        extracted_text = response.text

        create_receipt(extracted_text, file_name="result/receipt.pdf")
        return FileResponse(path="result/receipt.pdf", filename="receipt.pdf", media_type='application/pdf')

    except Exception as e:
        raise HTTPException(status_code=500, detail=f"OCR failed: {str(e)}")