import os
import json
import random

from uuid import uuid4

from setting import APP_NAME


def file_path(param):
    """
    返回文件真实路径
    避免因为文件路径问题带来的麻烦
    Parameters:
        param: 文件相对路径
    Returns:
        path: 文件真实路径
    """
    abs_path = os.path.abspath(os.path.dirname(__file__))
    rel_path = abs_path[:abs_path.find(APP_NAME) + len(APP_NAME)]
    path = os.path.abspath(rel_path + param)
    return path


def read_json_file(param):
    """
    读取json文件
    Parameters:
        param: json文件真实路径
    Returns:
        result: json内容
    """
    with open(param, "r", encoding='utf-8') as f:
        result = json.load(f)
        return result


def read_file(param):
    """
    读取文件内容
    Parameters:
        param: 文件真实路径
    Returns:
        result: 文件内容
    """
    with open(param, "r", encoding="utf-8") as f:
        result = f.read()
        return result


def make_id():
    """
    简化32位uuid为8位id
    Parameters:
        -
    Returns:
        result: 8位ID
    """
    uuid_chars = ("a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m",
                  "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z",
                  "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
                  "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z",
                  "0", "1", "2", "3", "4", "5", "6", "7", "8", "9")
    uuid = str(uuid4()).replace('-', '')
    res = ''
    for i in range(0, 8):
        sub = uuid[i * 4: i * 4 + 4]
        x = int(sub, 16)
        res += uuid_chars[x % 0x3E]
    return res


def make_verify_code():
    """
    随机生成6位数字，主要用于验证码
    Parameters:
        -
    Returns:
        code: 6位数字
    """
    code = ""
    for i in range(6):
        ch = chr(random.randrange(ord('0'), ord('9') + 1))
        code += ch
    return code