import datetime as dt
import os
from pathlib import Path

import gradio as gr


def _build_label() -> str:
    version_file = Path("VERSION")
    version_from_file = ""
    if version_file.exists():
        version_from_file = version_file.read_text(encoding="utf-8").strip()

    commit = (
        os.getenv("GITHUB_SHA")
        or os.getenv("COMMIT_SHA")
        or os.getenv("SPACE_COMMIT_SHA")
        or version_from_file
        or "local"
    )
    short_commit = commit[:7] if commit != "local" else commit
    version = os.getenv("APP_VERSION") or short_commit
    deployed_at = dt.datetime.utcnow().strftime("%Y-%m-%d %H:%M:%S UTC")
    return f"Version: {version} | Commit: {short_commit} | Loaded: {deployed_at}"


def echo_with_meta(message: str) -> str:
    clean = (message or "").strip()
    if not clean:
        return "Type something to test your CI/CD sync."

    now = dt.datetime.utcnow().strftime("%Y-%m-%d %H:%M:%S UTC")
    return (
        f"You typed: {clean}\n"
        f"Length: {len(clean)} characters\n"
        f"Built from GitHub sync demo\n"
        f"Timestamp: {now}"
    )


with gr.Blocks(title="GitHub to Hugging Face Sync Demo") as demo:
    gr.Markdown("# GitHub to HuggingFace CI/CD Demo")
    gr.Markdown(f"**{_build_label()}**")
    gr.Markdown(
        "Edit this app in GitHub, push a commit, and your Hugging Face Space updates automatically."
    )

    text = gr.Textbox(
        label="Try a message",
        placeholder="Change this app in GitHub and test it here",
        lines=3,
    )
    output = gr.Textbox(label="Result", lines=6)
    run_btn = gr.Button("Run")

    run_btn.click(fn=echo_with_meta, inputs=[text], outputs=[output])


if __name__ == "__main__":
    # server_name="0.0.0.0" is required inside HF Space containers.
    # root_path ensures Gradio resolves JS/CSS assets correctly when running
    # behind a reverse proxy or custom domain.
    demo.launch(server_name="0.0.0.0", root_path=os.getenv("GRADIO_ROOT_PATH", ""))