#!/usr/bin/env python3
import os
import re
import sys


def add_space(origin: str):
    modified = "{} {}".format(origin[0], origin[1])
    print(repr(origin), "->", modified)
    return modified


def change_dot(origin: str):
    modified = "{}．".format(origin)
    print(repr(origin), "->", modified)
    return modified


def remove_space(origin: str):
    modified = origin.replace(" ", "")
    print(repr(origin), "->", modified)
    return modified


def handle(full_path: str):
    print(full_path)
    with open(full_path, "r", encoding="utf-8") as fp:
        content = fp.read()
    content = re.sub(
        "[0-9a-zA-Z][|\u4e00-\u9fa5]", lambda x: add_space(x.group(0)), content
    )
    content = re.sub(
        "[|\u4e00-\u9fa5][0-9a-zA-Z]", lambda x: add_space(x.group(0)), content
    )
    content = re.sub("[0-9a-zA-Z%][。]", lambda x: change_dot(x.group(0)), content)
    content = re.sub("[，。；：？！”）] ", lambda x: remove_space(x.group(0)), content)
    content = re.sub("  [，。；：？！“（]", lambda x: remove_space(x.group(0)), content)
    content = re.sub("^[ ]+$", "", content)
    content = re.sub(" MtF ", " MtF ", content, flags=re.IGNORECASE)
    content = re.sub(" LGBT ", " LGBT ", content, flags=re.IGNORECASE)
    content = re.sub(" QQ ", " QQ ", content, flags=re.IGNORECASE)
    content = re.sub("\n\n\n", "\n\n", content)
    with open(full_path, "w", encoding="utf-8") as fp:
        fp.write(content)


def walk_all_files(base: str):
    print(base)
    for root, dirs, files in os.walk(base):
        for file in files:
            full_path = os.path.join(root, file)
            full_path: str
            if full_path.endswith(".md"):
                handle(full_path)


def main():
    if len(sys.argv) < 2:
        walk_all_files(os.getcwd())
    else:
        walk_all_files(sys.argv[1])


if __name__ == "__main__":
    main()