"""
Smoke Signal — Hugging Face Spaces entry point
===============================================
This file is the Gradio app for the human review workbench (Stage 8).
Currently a placeholder — will be built after Stage 1-7 pipeline is working.

To run locally:
    pip install gradio
    python app.py

To deploy to HF Spaces:
    Push this repo to a Hugging Face Space with SDK: gradio
"""

import gradio as gr

def placeholder(message):
    return f"Smoke Signal review workbench — coming in Stage 8. You said: {message}"

with gr.Blocks(title="Smoke Signal — Review Workbench") as demo:
    gr.Markdown("""
    # 🔭 Totem: Smoke Signal
    ### Picture-Book OCR & Codex Extraction — Human Review Workbench

    **Status:** Pipeline under construction (Stage 0–1 complete)

    Current stages:
    - ✅ Stage 0: Project lock & scaffold
    - ✅ Stage 1: Source registry & hashing
    - 🔲 Stage 2: Calibration corpus selection
    - 🔲 Stage 3: PDF profiling & rendering
    - 🔲 Stage 4: OCR bake-off (Surya baseline)
    - 🔲 Stage 5: Region detection
    - 🔲 Stage 6: Reading order resolver
    - 🔲 Stage 7: LLM normalisation
    - 🔲 Stage 8: This review workbench
    """)

    with gr.Row():
        msg = gr.Textbox(label="Test input")
        out = gr.Textbox(label="Output")
    msg.submit(placeholder, inputs=msg, outputs=out)

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