"""EULA tab for Gradio demos.

Displays the End User License Agreement as a read-only Markdown tab.
The EULA text is loaded from ``shared/assets/EULA.md`` so it can be
updated without changing any Python code.

Usage::

    with gr.Blocks() as demo:
        with gr.Tabs():
            build_eula_tab()
"""

from pathlib import Path

import gradio as gr

_ASSETS_DIR = Path(__file__).resolve().parent / "assets"
_DEFAULT_EULA_PATH = _ASSETS_DIR / "EULA.md"


def build_eula_tab(
    eula_path: str | Path | None = None,
    tab_label: str = "EULA",
) -> gr.TabItem:
    """Create a tab displaying the EULA as Markdown.

    Must be called inside a ``gr.Tabs()`` context.

    Args:
        eula_path: Path to a Markdown file. Defaults to ``shared/assets/EULA.md``.
        tab_label: Label shown on the tab. Defaults to ``"EULA"``.

    Returns:
        The ``gr.TabItem`` component.
    """
    path = Path(eula_path) if eula_path is not None else _DEFAULT_EULA_PATH

    if path.is_file():
        content = path.read_text(encoding="utf-8")
    else:
        content = f"_EULA file not found. Expected location:_ `{path}`"

    with gr.TabItem(tab_label) as tab:
        gr.Markdown(content)

    return tab