# utils_viz.py
import io
import matplotlib.pyplot as plt

# utils_viz.py
import io
import matplotlib.pyplot as plt
from PIL import Image   # ← add this import

def bar_topk(top_rows):
    labels = [r["name"] for r in top_rows]
    vals = [r["score"] for r in top_rows]
    fig, ax = plt.subplots(figsize=(7, 3))
    ax.barh(labels[::-1], vals[::-1])
    ax.set_xlabel("Score")
    ax.set_xlim(0, 100)
    fig.tight_layout()

    bio = io.BytesIO()
    fig.savefig(bio, format="png", dpi=160, bbox_inches="tight")
    plt.close(fig)
    bio.seek(0)

    # Return a PIL Image (what gr.Image(type="pil") wants)
    return Image.open(bio).convert("RGB")