import os
import re
from datetime import datetime

# ====================== 【配置区，请修改】 ======================
MEDIA_FOLDER = "/Volumes/JoyDisk/myMedia/olstrms/电影/未分类/2025"  # Mac挂载NAS路径
# MEDIA_FOLDER = "/media/movies"    # 飞牛容器内运行用这个

DRY_RUN = True          # True=预览，不修改；确认无误改为False执行改名
SKIP_PROCESSED = False  # True=跳过已处理（文件名含(20xx)年份）
LOG_FILE = "./rename_log.txt"
# =================================================================

# 清洗正则规则（文件夹、文件共用一套）
RULES = [
    (r"^[A-Za-z] ", ""), # 【新增】移除开头单个英文字母+空格：A 流浪地球 → 流浪地球
    (r"(?<=[a-zA-Z0-9])\.(?=[a-zA-Z0-9])", " "), # Dune.Part → Dune Part
    (r"\[.*?\]", ""),  # 删除全部 [xxx] 方括号内容
    (r"\s*(2160p|1080p|720p|HDR|DV|DoVi|HEVC|x265|x264|DDP|AAC|Atmos|TrueHD)\b", ""),
    (r"\.+", " "),     # 剩下连续多个点替换成空格
]

# 支持的文件后缀
ALLOW_EXT = {".mkv", ".mp4", ".mov", ".srt", ".ass", ".sub"}

def clean_name(name: str) -> str:
    """统一清洗函数，文件夹名、文件名共用"""
    name_no_ext, ext = os.path.splitext(name)

    # 处理 A . B . C 这种「字母 空格 . 空格 字母」
    while re.search(r"(\w) \. (\w)", name_no_ext):
        name_no_ext = re.sub(r"(\w) \. (\w)", r"\1\2", name_no_ext)

    # 执行所有正则替换规则
    for pattern, repl in RULES:
        name_no_ext = re.sub(pattern, repl, name_no_ext)

    # 合并连续空格，去除首尾空格
    name_no_ext = re.sub(r"\s+", " ", name_no_ext).strip()
    return name_no_ext + ext

def write_log(msg: str):
    time_str = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
    line = f"[{time_str}] {msg}"
    print(line)
    with open(LOG_FILE, "a", encoding="utf-8") as f:
        f.write(line + "\n")

if __name__ == "__main__":
    write_log("===== 文件名+文件夹清洗（移除开头A 中文片名前缀） =====")
    write_log(f"根目录：{MEDIA_FOLDER}")
    write_log(f"预览模式 DRY_RUN = {DRY_RUN}")

    dir_rename_list = []
    file_rename_list = []

    # 遍历收集（自底向上，防止目录路径错乱）
    for root, dirs, files in os.walk(MEDIA_FOLDER, topdown=False):
        # 文件
        for fname in files:
            ext = os.path.splitext(fname)[1].lower()
            if ext not in ALLOW_EXT:
                continue
            new_name = clean_name(fname)
            if new_name != fname:
                if SKIP_PROCESSED and re.search(r"\(\d{4}\)", new_name):
                    write_log(f"跳过文件（疑似已处理）: {fname}")
                    continue
                old_path = os.path.join(root, fname)
                new_path = os.path.join(root, new_name)
                file_rename_list.append((old_path, new_path))

        # 文件夹
        for dname in dirs:
            new_name = clean_name(dname)
            if new_name != dname:
                if SKIP_PROCESSED and re.search(r"\(\d{4}\)", new_name):
                    write_log(f"跳过文件夹（疑似已处理）: {dname}")
                    continue
                old_path = os.path.join(root, dname)
                new_path = os.path.join(root, new_name)
                dir_rename_list.append((old_path, new_name))

    # 先改文件夹，再改文件
    dir_count = 0
    for old, new in dir_rename_list:
        write_log(f"【文件夹】{os.path.basename(old)} → {os.path.basename(new)}")
        dir_count +=1
        if not DRY_RUN:
            os.rename(old, new)

    file_count =0
    for old, new in file_rename_list:
        write_log(f"【文件】{os.path.basename(old)} → {os.path.basename(new)}")
        file_count +=1
        if not DRY_RUN:
            os.rename(old, new)

    write_log(f"任务完成，待修改文件夹：{dir_count}，待修改文件：{file_count}")
    write_log("="*60 + "\n")