import gradio as gr
import matplotlib.pyplot as plt
import numpy as np
from sklearn.cluster import MeanShift, estimate_bandwidth
from sklearn.datasets import make_blobs


def get_clusters_plot(n_blobs, quantile, cluster_std):
    X, _, centers = make_blobs(
        n_samples=10000, cluster_std=cluster_std, centers=n_blobs, return_centers=True
    )

    bandwidth = estimate_bandwidth(X, quantile=quantile, n_samples=500)

    ms = MeanShift(bandwidth=bandwidth, bin_seeding=True)
    ms.fit(X)
    labels = ms.labels_
    cluster_centers = ms.cluster_centers_

    labels_unique = np.unique(labels)
    n_clusters_ = len(labels_unique)

    fig = plt.figure()

    for k in range(n_clusters_):
        my_members = labels == k
        cluster_center = cluster_centers[k]
        plt.scatter(X[my_members, 0], X[my_members, 1])
        plt.plot(
            cluster_center[0],
            cluster_center[1],
            "x",
            markeredgecolor="k",
            markersize=14,
        )

    if len(centers) != n_clusters_:
        message = (
            '<p style="text-align: center;">'
            + f"The number of estimated clusters ({n_clusters_})"
            + f" differs from the true number of clusters ({n_blobs})."
            + " Try changing the `Quantile` parameter.</p>"
        )
    else:
        message = (
            '<p style="text-align: center;">'
            + f"The number of estimated clusters ({n_clusters_})"
            + f" matches the true number of clusters ({n_blobs})!</p>"
        )
    return fig, message


demo = gr.Interface(
    get_clusters_plot,
    [
        gr.Slider(
            minimum=2, maximum=10, label="Number of clusters in data", step=1, value=3
        ),
        gr.Slider(
            minimum=0,
            maximum=1,
            step=0.05,
            value=0.2,
            label="Quantile",
            info="Used to determine clustering's bandwidth.",
        ),
        gr.Slider(
            minimum=0.1,
            maximum=1,
            label="Clusters standard deviation",
            step=0.1,
            value=0.6,
        ),
    ],
    [gr.Plot(label="Clusters' Plot"), gr.HTML()],
    allow_flagging="never",
)

if __name__ == "__main__":
    demo.launch()