app.py

import os
import torch
from PIL import Image
import gradio as gr
from evaluate import Detector, seed_torch

# --- Cấu hình args ---
class Args:
    gpu = 0  # GPU index
    device = f"cuda:{gpu}" if torch.cuda.is_available() else "cpu"
    semantic_weights_path = "pretrained/semantic_weights.pth"
    artifact_weights_path = "pretrained/artifact_weights.pth"
    classifier_weights_path = "pretrained/classifier_weights.pth"
    batch_size = 32
    seed = 1024

args = Args()
seed_torch(args.seed)

# --- Khởi tạo detector 1 lần ---
detector = Detector(args)

# --- Hàm scan 1 ảnh ---
def scan_image(detector, image):
    if image is None:
        return 0.0, "Invalid Image"
    image = image.convert("RGB")
    image = detector.model.test_transform(image)
    image = image.unsqueeze(0).to(detector.device)
    probability = detector.predict(image)[0]
    label = "AI-Generated" if probability > 0.5 else "Real"
    return probability, label

# --- Callback Gradio cho nhiều ảnh ---
def gradio_scan(images):
    results = []
    for image in images:
        prob, label = scan_image(detector, image)
        results.append(f"Prediction: {prob:.3f}, Label: {label}")
    return "\n".join(results)

# --- Giao diện Gradio ---
iface = gr.Interface(
    fn=gradio_scan,
    inputs=gr.Gallery(label="Upload Images", columns=2, type="pil"),
    outputs="text",
    title="CO-SPY Scan Synthetic Images",
    description="Upload 1 hoặc nhiều ảnh và CO-SPY trả xác suất AI-generated hoặc Real."
)

# --- Launch ---
iface.launch(share=True, ssr_mode=False)