import gradio as gr
import pandas as pd
from transformers import AutoImageProcessor, AutoModelForObjectDetection
from PIL import Image, ImageDraw
import torch

image_processor = AutoImageProcessor.from_pretrained('hustvl/yolos-small')
model = AutoModelForObjectDetection.from_pretrained('hustvl/yolos-small')

def detect(image): 
    inputs = image_processor(images=image, return_tensors="pt")
    outputs = model(**inputs)

    # convert outputs to COCO API
    target_sizes = torch.tensor([image.size[::-1]])
    results = image_processor.post_process_object_detection(outputs,
                                                            threshold=0.9,
                                                            target_sizes=target_sizes)[0]

    draw = ImageDraw.Draw(image)
    
    # label and the count
    counts = {}

    for score, label, box in zip(results["scores"], results["labels"], results["boxes"]):
        box = [round(i, 4) for i in box.tolist()]
        label_name = model.config.id2label[label.item()]
        if label_name not in counts:
            counts[label_name] = 0
        counts[label_name] += 1

        x1, y1, x2, y2 = tuple(box)
        draw.rectangle((x1, y1, x2, y2), outline=[128, 128, 50], width=2)
        draw.text((x1, y1), label_name, fill="white")

    df = pd.DataFrame({
        'label': [label for label in counts],
        'counts': [counts[label] for label in counts]
    })
        
    return image, df, counts

demo = gr.Interface(
    fn=detect,
    inputs=[gr.inputs.Image(label="Input image", type="pil")],
    outputs=["image", gr.BarPlot(x="label", y="counts", x_title="Labels", y_title="Counts"), gr.Textbox()],
    title="Object Counts in Image"
)

demo.launch()