"""
文件工具函数
提供统一的文件删除功能，自动处理缩略图同步删除
"""
import os
from pathlib import Path

from app.config import get_settings

settings = get_settings()

# 文件系统路径（从配置读取）
UPLOAD_DIR = Path(settings.UPLOAD_DIR)
THUMBNAIL_DIR = UPLOAD_DIR / "thumbnails"

# URL 路径
STORAGE_URL = "/storage/admin/images"
THUMBNAIL_URL = f"{STORAGE_URL}/thumbnails"


def cleanup_file(file_path: str | Path) -> bool:
    """
    删除文件并同步删除对应的缩略图

    Args:
        file_path: 文件路径（相对 /uploads 的路径、/storage/admin/images/ 格式或绝对路径）

    Returns:
        bool: 是否成功删除原文件
    """
    if not file_path:
        return False

    # 统一处理为 Path 对象
    if isinstance(file_path, str):
        # 处理新的存储路径格式 /storage/admin/images/...
        if file_path.startswith("/storage/admin/images/"):
            # 提取相对路径部分
            relative_path = file_path[len("/storage/admin/images/"):]
            full_path = UPLOAD_DIR / relative_path
        else:
            # 移除开头的 / 并构建完整路径（兼容旧格式）
            relative_path = file_path.lstrip("/")
            full_path = UPLOAD_DIR / relative_path
    else:
        full_path = file_path
    
    # 删除原文件
    deleted = False
    try:
        if full_path.exists():
            full_path.unlink()
            deleted = True
            print(f"[cleanup] 已删除文件: {full_path}")
    except Exception as e:
        print(f"[cleanup] 删除文件失败 {full_path}: {e}")
    
    # 同步删除缩略图
    # 缩略图与原图同名，但扩展名统一为 .jpg，存放在 /uploads/thumbnails/
    try:
        thumbnail_name = f"{full_path.stem}.jpg"
        thumb_path = THUMBNAIL_DIR / thumbnail_name
        if thumb_path.exists():
            thumb_path.unlink()
            print(f"[cleanup] 已删除缩略图: {thumb_path}")
    except Exception as e:
        print(f"[cleanup] 删除缩略图失败: {e}")
    
    return deleted


def cleanup_file_by_path(relative_path: str) -> bool:
    """
    根据相对路径删除文件及其缩略图

    Args:
        relative_path: 相对于 /uploads 的路径，如 "20250420_xxx.jpg"
        或者完整的存储路径如 "/storage/admin/images/xxx.jpg"

    Returns:
        bool: 是否成功删除原文件
    """
    if not relative_path:
        return False

    # 排除外部 URL
    if relative_path.startswith(("http://", "https://")):
        print(f"[cleanup] 跳过外部 URL: {relative_path}")
        return False

    # 处理新的存储路径格式 /storage/admin/images/...
    if relative_path.startswith("/storage/admin/images/"):
        # 提取相对路径部分
        rel_path = relative_path[len("/storage/admin/images/"):]
        full_path = UPLOAD_DIR / rel_path
    else:
        # 处理可能包含开头 / 的路径（兼容旧格式）
        rel_path = relative_path.lstrip("/")
        full_path = UPLOAD_DIR / rel_path

    return cleanup_file(full_path)