import os
import re
import argparse
from datetime import datetime

# ====================== 【配置区，不再写死目录】 ======================
LOG_FILE = "./rename_log.txt"

# 清洗规则
RULES = [
    (r"^[A-Za-z] ", ""),                 #1.移除开头单个字母+空格
    (r"\[.*?\]", ""),                    #2.移除英文方括号及内部内容
    (r"【.*?】", ""),                    #3.移除中文【】及内部内容
    (r"丨", ""),                         #清除汉字竖线 丨
    (r"\b(2160p|1080p|720p|HDR|DV|DoVi|HEVC|x265|x264|DDP|AAC|Atmos|TrueHD|中英双语|双语字幕)\b", "", re.IGNORECASE),
    (r"\.+", ""),                        #删除连续的点
    (r"\s", ""),                         #删除全部空格
    # 保留：汉字、半角英文、数字、半角 () . : + -
    (r"[^\u4e00-\u9fa5a-zA-Z0-9().:+-]", ""),
]
ALLOW_EXT = {".mkv", ".mp4", ".mov", ".srt", ".ass", ".sub", ".strm",".flv",".avi",".wmv",".ts",".rmvb",".webm",".mp3",".flac",".aac",".wav",".ogg",".m4a",".wma",".alac",".rm",".iso"}


# ====================================================================

def clean_filename(name: str) -> str:
    name_no_ext, ext = os.path.splitext(name)
    # 全角转半角
    def full2half(s):
        result = []
        for char in s:
            code = ord(char)
            if code == 12288:
                char = chr(32)
            elif 65281 <= code <= 65374:
                char = chr(code - 65248)
            result.append(char)
        return "".join(result)
    name_no_ext = full2half(name_no_ext)

    for item in RULES:
        if len(item) == 3:
            pat, repl, flag = item
            name_no_ext = re.sub(pat, repl, name_no_ext, flags=flag)
        else:
            pat, repl = item
            name_no_ext = re.sub(pat, repl, name_no_ext)
    name_no_ext = name_no_ext.strip()
    return name_no_ext + ext

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

def main():
    parser = argparse.ArgumentParser(description="媒体文件名批量清洗重命名工具")
    parser.add_argument("--dir", required=True, help="目标根目录路径")
    parser.add_argument("--apply", action="store_true", help="加上此参数才执行真实重命名；默认仅预览DryRun")
    args = parser.parse_args()

    target_dir = args.dir
    DRY_RUN = not args.apply

    # 校验目录是否存在
    if not os.path.isdir(target_dir):
        print(f"错误：目录不存在 -> {target_dir}")
        return

    # 每次运行前清空日志文件
    with open(LOG_FILE, "w", encoding="utf-8") as f:
        f.flush()

    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：{target_dir}")
    write_log(f"预览模式 DRY_RUN = {DRY_RUN}")

    file_rename_list = []
    dir_rename_list = []
    total_scan_dirs = 0
    total_all_files = 0      # 全部扫描到的文件（所有后缀）
    total_media_files = 0    # 媒体文件（ALLOW_EXT后缀）

    for root, dirs, files in os.walk(target_dir, topdown=False):
        total_scan_dirs += 1
        for fname in files:
            total_all_files +=1
            ext = os.path.splitext(fname)[1].lower()
            if ext in ALLOW_EXT:
                total_media_files += 1
                new_name = clean_filename(fname)
                if new_name != fname:
                    old_path = os.path.join(root, fname)
                    new_path = os.path.join(root, new_name)
                    file_rename_list.append((old_path, new_path))
                    write_log(f"待修改文件-> {fname} → {new_name}")

        # 处理文件夹
        for dname in dirs:
            new_name = clean_filename(dname)
            if new_name != dname:
                old_path = os.path.join(root, dname)
                new_path = os.path.join(root, new_name)
                dir_rename_list.append((old_path, new_name))
                write_log(f"待修改文件夹-> {dname} → {new_name}")

    # ========== 执行阶段 ==========
    if not DRY_RUN:
        # 先文件
        for old, new in file_rename_list:
            try:
                os.rename(old, new)
            except Exception as e:
                write_log(f"【文件重命名失败】{old} -> {new} | 错误：{e}")
        # 后文件夹
        for old, new in dir_rename_list:
            try:
                os.rename(old, new)
            except Exception as e:
                write_log(f"【文件夹重命名失败】{old} -> {new} | 错误：{e}")

    # 最终汇总输出
    write_log(f"任务完成，总扫描目录：{total_scan_dirs}，待修改文件夹：{len(dir_rename_list)}")
    write_log(f"总扫描文件：{total_all_files}，媒体文件：{total_media_files}，待修改文件：{len(file_rename_list)}")
    write_log("============================================================")

if __name__ == "__main__":
    main()