"""from fastapi import FastAPI
from fastapi.responses import RedirectResponse
import gradio as gr
from transformers import pipeline, ViltProcessor, ViltForQuestionAnswering, AutoTokenizer, AutoModelForCausalLM
from PIL import Image
import torch
import fitz  # PyMuPDF for PDF
app = FastAPI()

# ========== Image QA Setup ==========
vqa_processor = ViltProcessor.from_pretrained("dandelin/vilt-b32-finetuned-vqa")
vqa_model = ViltForQuestionAnswering.from_pretrained("dandelin/vilt-b32-finetuned-vqa")
def answer_question_from_image(image, question):
    if image is None or not question.strip():
        return "Please upload an image and ask a question."
    inputs = vqa_processor(image, question, return_tensors="pt")
    with torch.no_grad():
        outputs = vqa_model(**inputs)
    predicted_id = outputs.logits.argmax(-1).item()
    return vqa_model.config.id2label[predicted_id]
# ========== Gradio Interfaces ==========

img_interface = gr.Interface(
    fn=answer_question_from_image,
    inputs=[gr.Image(label="Upload Image"), gr.Textbox(label="Ask a Question")],
    outputs="text",
    title="Image Question Answering"
)
# ========== Combine and Mount ==========
demo = gr.TabbedInterface( img_interface , "Image QA")
app = gr.mount_gradio_app(app, demo, path="/")
@app.get("/")
def root():
    return RedirectResponse(url="/") """
"""from transformers import ViltProcessor, ViltForQuestionAnswering
import torch

# Load image QA model once
vqa_processor = ViltProcessor.from_pretrained("dandelin/vilt-b32-finetuned-vqa")
vqa_model = ViltForQuestionAnswering.from_pretrained("dandelin/vilt-b32-finetuned-vqa")

def answer_question_from_image(image, question):
    if image is None or not question.strip():
        return "Please upload an image and ask a question."
    
    inputs = vqa_processor(image, question, return_tensors="pt")
    with torch.no_grad():
        outputs = vqa_model(**inputs)
    
    predicted_id = outputs.logits.argmax(-1).item()
    return vqa_model.config.id2label[predicted_id]"""
from fastapi import FastAPI, UploadFile, Form
from fastapi.responses import RedirectResponse, JSONResponse, FileResponse
import os
from PIL import Image
from transformers import ViltProcessor, ViltForQuestionAnswering, pipeline
from gtts import gTTS
import easyocr
import torch
import tempfile
import numpy as np
from io import BytesIO

app = FastAPI()

# Load models
vqa_processor = ViltProcessor.from_pretrained("dandelin/vilt-b32-finetuned-vqa")
vqa_model = ViltForQuestionAnswering.from_pretrained("dandelin/vilt-b32-finetuned-vqa")
captioner = pipeline("image-to-text", model="nlpconnect/vit-gpt2-image-captioning")
reader = easyocr.Reader(['en', 'fr'])

def classify_question(question: str):
    question_lower = question.lower()
    if any(word in question_lower for word in ["text", "say", "written", "read"]):
        return "ocr"
    elif any(word in question_lower for word in ["caption", "describe", "what is in the image"]):
        return "caption"
    else:
        return "vqa"

def answer_question_from_image(image, question):
    if image is None or not question.strip():
        return "Please upload an image and ask a question.", None

    mode = classify_question(question)

    if mode == "ocr":
        try:
            result = reader.readtext(np.array(image))
            text = " ".join([entry[1] for entry in result])
            answer = text.strip() or "No readable text found."
        except Exception as e:
            answer = f"OCR Error: {e}"

    elif mode == "caption":
        try:
            answer = captioner(image)[0]['generated_text']
        except Exception as e:
            answer = f"Captioning error: {e}"

    else:
        try:
            inputs = vqa_processor(image, question, return_tensors="pt")
            with torch.no_grad():
                outputs = vqa_model(**inputs)
            predicted_id = outputs.logits.argmax(-1).item()
            answer = vqa_model.config.id2label[predicted_id]
        except Exception as e:
            answer = f"VQA error: {e}"

    try:
        tts = gTTS(text=answer)
        with tempfile.NamedTemporaryFile(delete=False, suffix=".mp3") as tmp:
            tts.save(tmp.name)
            audio_path = tmp.name
    except Exception as e:
        return f"Answer: {answer}\n\n⚠️ Audio generation error: {e}", None

    return answer, audio_path

@app.post("/predict")
async def predict(question: str = Form(...), file: UploadFile = Form(...)):
    try:
        image_data = await file.read()
        image = Image.open(BytesIO(image_data)).convert("RGB")
        answer, audio_path = answer_question_from_image(image, question)

        if audio_path and os.path.exists(audio_path):
            return JSONResponse({"answer": answer, "audio": f"/audio/{os.path.basename(audio_path)}"})
        else:
            return JSONResponse({"answer": answer})

    except Exception as e:
        return JSONResponse({"error": str(e)})

@app.get("/audio/{filename}")
async def get_audio(filename: str):
    filepath = os.path.join(tempfile.gettempdir(), filename)
    return FileResponse(filepath, media_type="audio/mpeg")

@app.get("/")
def home():
    return RedirectResponse(url="/templates/home.html")