# utils/asset_manager.py

import streamlit as st
from pathlib import Path
from config import SHARED_ASSETS_DIR 


def list_shared_videos() -> list[str]:
    """列出所有共享影片的檔案名稱。"""
    try:
        if not SHARED_ASSETS_DIR.exists():
            return []
        
        return sorted(
            [f.name for f in SHARED_ASSETS_DIR.glob('*') if f.suffix.lower() in ['.mp4', '.mov']]
        )
    except Exception as e:
        # 可以在這裡記錄錯誤日誌
        st.error(f"讀取共享素材庫時出錯: {e}")
        return []

def save_uploaded_shared_videos(uploaded_files: list) -> tuple[int, list[str]]:
    """
    將上傳的檔案儲存到共享素材庫。
    回傳 (成功數量, 錯誤訊息列表)。
    """
    if not uploaded_files:
        return 0, []

    saved_count = 0
    errors = []
    
    try:
        SHARED_ASSETS_DIR.mkdir(parents=True, exist_ok=True)
        for uploaded_file in uploaded_files:
            try:
                with open(SHARED_ASSETS_DIR / uploaded_file.name, "wb") as f:
                    f.write(uploaded_file.getbuffer())
                saved_count += 1
            except Exception as e:
                errors.append(f"儲存 '{uploaded_file.name}' 時出錯: {e}")
    except Exception as e:
        errors.append(f"無法建立共享資料夾 '{SHARED_ASSETS_DIR}': {e}")
        
    return saved_count, errors