import streamlit as st
import base64
from pathlib import Path


def _img_to_base64(path: str) -> str:
    """로컬 이미지 파일을 base64 문자열로 변환"""
    with open(path, "rb") as f:
        return base64.b64encode(f.read()).decode()


def show_loading(
    logo_path: str = "assets/team_icon.png",
    size: int = 120,
    height_vh: int = 60,
    speed: float = 1.2,
):
    """
    회전하는 로딩 로고 표시

    Returns
    -------
    placeholder : st.empty()
        loading.empty()로 제거 가능
    """

    # 경로 안정화 (pages/에서도 동일하게 동작)
    logo_path = Path(logo_path).as_posix()

    logo_base64 = _img_to_base64(logo_path)

    placeholder = st.empty()
    placeholder.markdown(
        f"""
        <div style="
            display:flex;
            justify-content:center;
            align-items:center;
            height:{height_vh}vh;
        ">
          <img
            src="data:image/png;base64,{logo_base64}"
            width="{size}"
            style="animation: spin {speed}s linear infinite;"
          />
        </div>

        <style>
        @keyframes spin {{
          from {{ transform: rotate(0deg); }}
          to {{ transform: rotate(360deg); }}
        }}
        </style>
        """,
        unsafe_allow_html=True,
    )

    return placeholder