import math
import hashlib
import os
import json
import re
import asyncio


def get_bit_mask(start, end):
    bits = math.ceil((end + 1) / 8) * 8
    if bits == 0:
        bits = 8
    mask = 0
    for i in range(start, end + 1):
        mask |= 1 << (bits - i - 1)
    return mask


def generate_text_md5(input_string):
    # 创建一个 md5 哈希对象
    md5_hash = hashlib.md5()

    # 更新哈希对象的内容（需要将字符串编码为字节）
    md5_hash.update(input_string.encode('utf-8'))

    # 获取哈希值的十六进制表示
    md5_digest = md5_hash.hexdigest()

    return md5_digest


def generate_bytes_md5(input_bytes):
    # 创建一个 md5 哈希对象
    md5_hash = hashlib.md5()

    # 更新哈希对象内容
    md5_hash.update(input_bytes)

    # 获取哈希值的十六进制表示
    md5_digest = md5_hash.hexdigest()

    return md5_digest


async def get_md5_async(file: bytes):
    md5 = await asyncio.to_thread(generate_bytes_md5, file)
    return md5


async def save_to_file_async(data: bytes, file_path: str):
    await asyncio.to_thread(save_bytes_to_file, data, file_path)


def file_exists(cache_file: str):
    return os.path.exists(cache_file)


def read_from_file(file: str) -> str:
    with open(file, 'r', encoding='utf-8') as f:
        text = f.read()
    return text


def save_text_to_file(text: str, file: str):
    with open(file, 'w', encoding='utf-8') as f:
        f.write(text)


def save_bytes_to_file(bytes_data: bytes, file: str):
    with  open(file, 'wb') as f:
        f.write(bytes_data)


def replace_tpl_paras(tpl_text: str, data: dict):
    for key, val in data.items():
        if not isinstance(val, str):
            val = json.dumps(json.dumps(val, ensure_ascii=False), ensure_ascii=False)[1:-1]
        tpl_text = tpl_text.replace('{{' + key + '}}', val)
    return tpl_text


def to_file_name(text: str):
    """
    将文本转为合法的文件名称。
    将特殊字符替换为_
    :param text:
    :return:
    """
    return re.sub(r'[\t\\/:*?"<>|]', '_', text)