import os
import yaml
import random
import time


class CommonUtils(object):

    @staticmethod
    def get_current_time():
        """获取当前时间"""
        return time.strftime("%Y-%m-%d %H:%M:%S", time.localtime())

    @staticmethod
    def random_code(length):
        """生成随机编码"""
        choices = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
        code = ''
        for i in range(length):
            code += random.choice(choices)
        return code


def sub_dict(param1, param2):
    """
    获取字典的子集
    Parameters:
        param1: 原字典
        param2: 子集字段
    Returns:
        子集
    """
    return dict((key, value) for key, value in param1.items() if key in param2)


def df_iterrows(param):
    """
    按行以数组形式返回DataFrame的index、data
    Parameters:
        param: DataFrame 某个df对象
    Returns:
        result: list 遍历df对象每行数据，包括index
    """
    result = []
    for row in param.iterrows():
        index, data = row
        result.append([index] + data.tolist())
    return result


def get_attr(_dict_, _keys_, **kwargs):
    """
    获取字典属性值
    若发生了键值异常或类型异常,则返回设置的默认值
    若没有默认值,则返回None
    """
    value = kwargs['default'] if kwargs.__contains__('default') else None
    try:
        text = "_dict_"
        for _key_ in _keys_:
            text = text + "['{}']".format(_key_)
        value = eval(text)
    except KeyError:
        pass
    except TypeError:
        pass
    return value


def trans_fields_name(_dict_, names1, names2):
    """
    替换字典键值名称
    _dict_: 替换字典
    names1: 原字典键值
    names2: 新字典键值
    """

    for i in range(len(names1)):
        _dict_[names2[i]] = _dict_.pop(names1[i])

    return _dict_


def get_yaml(**kwargs):
    file_rel_path = kwargs['file_rel_path']
    file_path = os.path.abspath(os.path.dirname(__file__))
    index = file_path.find('Utils')
    if index != -1:
        abs_path_root = file_path[:index]
        file_abs_path = os.path.abspath(abs_path_root + '/Modules/' + file_rel_path)
        doc_yaml = open(file_abs_path, 'r', encoding="utf-8").read()
        return yaml.full_load(doc_yaml)


def make_multistage_update_body(input_dict):

    def get_dict_keys(_dict_):
        if isinstance(_dict_, dict):
            for key in _dict_.keys():
                if isinstance(_dict_[key], dict):
                    get_dict_keys(_dict_[key])
                update_keys.append(key)
            return update_keys

    def get_dict_value(data, keys):
        keys_list = keys.split('.')
        if isinstance(data, dict):
            for key in keys_list:
                values = data.get(key)
                data = values
            return data

    try:
        update_key = ''
        update_keys = []

        get_dict_keys(input_dict)
        update_keys.reverse()
        floor = len(update_keys)

        for i in range(floor):
            if i == floor - 1:
                update_key = update_key + update_keys[i]
            else:
                update_key = update_key + update_keys[i] + '.'

        update_value = get_dict_value(input_dict, update_key)

        return {update_key: update_value}

    except Exception:
        return None