app.py

import gradio as gr
import pandas as pd
import matplotlib.pyplot as plt
from pathlib import Path
from huggingface_hub import HfApi, Repository

# Matplotlib style
plt.rcParams.update({"font.family":"sans-serif","font.size":10})

# Global DataFrame
df = pd.DataFrame()

def upload_csv(file):
    global df
    df = pd.read_csv(file.name)
    if not {"text","label"}.issubset(df.columns):
        return (
            None, 
            "❌ CSV must contain 'text' and 'label' columns.",
            gr.update(visible=False), # hide action buttons
            gr.update(visible=False), # hide push
        )
    df["label"] = df["label"].fillna("")
    return (
        df[["text","label"]],
        "✅ Uploaded! You can now annotate and use the buttons below.",
        gr.update(visible=True),  # show action buttons
        gr.update(visible=True),  # show push accordion
    )

def save_changes(table):
    global df
    df = pd.DataFrame(table, columns=["text","label"])
    return "💾 Changes saved."

def download_csv():
    global df
    path = "annotated_data.csv"
    df.to_csv(path, index=False)
    return path

def make_figure():
    counts = df["label"].value_counts().sort_values(ascending=False)
    labels, values = list(counts.index), list(counts.values)
    fig, (ax1, ax2) = plt.subplots(
        ncols=2,
        gridspec_kw={"width_ratios":[1,2]},
        figsize=(8, max(2,len(labels)*0.4)),
        tight_layout=True
    )
    # table
    ax1.axis("off")
    tbl = ax1.table(
        cellText=[[l,v] for l,v in zip(labels,values)],
        colLabels=["Label","Count"],
        loc="center"
    )
    tbl.auto_set_font_size(False); tbl.set_fontsize(10); tbl.scale(1,1.2)
    # bar chart
    ax2.barh(labels, values, color="#222222")
    ax2.invert_yaxis(); ax2.set_xlabel("Count")
    return fig

def visualize_and_download():
    fig = make_figure()
    out_png = "label_distribution.png"
    fig.savefig(out_png, dpi=150, bbox_inches="tight")
    return fig, out_png

def push_to_hub(repo_name, hf_token):
    global df
    try:
        api = HfApi()
        api.create_repo(repo_id=repo_name, token=hf_token,
                        repo_type="dataset", exist_ok=True)
        local_dir = Path(f"./{repo_name.replace('/','_')}")
        if local_dir.exists():
            for f in local_dir.iterdir(): f.unlink()
            local_dir.rmdir()
        repo = Repository(
            local_dir=str(local_dir),
            clone_from=repo_name,
            repo_type="dataset",
            use_auth_token=hf_token
        )
        df.to_csv(local_dir/"data.csv", index=False)
        repo.push_to_hub(commit_message="📑 Updated annotated data")
        return f"🚀 Pushed to datasets/{repo_name}"
    except Exception as e:
        return f"❌ Push failed: {e}"

with gr.Blocks() as app:
    gr.Markdown("## 🏷️ Label It! Text Annotation Tool")
    gr.Markdown("Upload a `.csv` (columns: **text**, **label**), then annotate, export, visualize, or push.")

    # STEP 1: Upload
    with gr.Row():
        csv_in = gr.File(label="📁 Upload CSV", file_types=[".csv"])
        upload_btn = gr.Button("Upload")

    # Editable table + status
    table     = gr.Dataframe(headers=["text","label"], interactive=True, visible=False)
    status    = gr.Textbox(label="Status", interactive=False)

    # STEP 2: Action buttons (hidden initially)
    with gr.Row(visible=False) as actions:
        save_btn         = gr.Button("💾 Save")
        download_csv_btn = gr.DownloadButton(fn=download_csv, label="⬇️ Download CSV", file_name="annotated_data.csv")
        download_png_btn = gr.DownloadButton(fn=visualize_and_download, label="⬇️ Download Chart", file_name="label_distribution.png")
        visualize_btn    = gr.Button("📊 Visualize")

    chart_plot = gr.Plot(visible=False)

    # Push accordion
    push_acc   = gr.Accordion("📦 Push to Hugging Face Hub", open=False, visible=False)
    with push_acc:
        repo_in   = gr.Textbox(label="Repo (username/dataset)")
        token_in  = gr.Textbox(label="🔑 HF Token", type="password")
        push_btn  = gr.Button("🚀 Push")
        push_out  = gr.Textbox(label="Push Status", interactive=False)

    # Event wiring
    upload_btn.click(
        upload_csv,
        inputs=csv_in,
        outputs=[table, status, actions, push_acc]
    )
    save_btn.click(
        save_changes,
        inputs=table,
        outputs=status
    )
    visualize_btn.click(
        visualize_and_download,
        inputs=None,
        outputs=[chart_plot, download_png_btn]
    )
    push_btn.click(
        push_to_hub,
        inputs=[repo_in, token_in],
        outputs=push_out
    )

app.launch()