import datetime
import multiprocessing
import os

import chardet
import pandas as pd


def detect_file_encoding(filename):
    # 读取文件的前1000个字节（足够用于大多数编码检测）
    with open(filename, 'rb') as f:
        rawdata = f.read(1000)
    result = chardet.detect(rawdata)
    encoding = result['encoding']

    print("文件类型:", filename, encoding)

    if encoding is None:
        encoding = 'gb18030'

    if encoding.lower() in ['utf-8', 'ascii', 'utf8', 'utf-8-sig']:
        return 'utf-8'

    return 'gb18030'


def __build_directory_dict(directory_dict, path, filter_types=None):
    # 遍历目录下的所有项
    for item in os.listdir(path):
        item_path = os.path.join(path, item)
        if os.path.isdir(item_path):
            __build_directory_dict(directory_dict, item_path, filter_types=filter_types)
        elif os.path.isfile(item_path):
            if path not in directory_dict:
                directory_dict[path] = []

            if filter_types is None or len(filter_types) == 0:
                directory_dict[path].append(item_path)
            elif str(item_path).split(".")[-1] in filter_types:
                if str(item_path).count("~$") == 0:
                    directory_dict[path].append(item_path)


# 读取路径下所有的excel文件
def read_excel_files(read_path, filter_types=None):
    if filter_types is None:
        filter_types = ['xls', 'xlsx', 'csv', 'gz']
    if os.path.isfile(read_path):
        return [read_path]

    directory_dict = {}
    __build_directory_dict(directory_dict, read_path, filter_types=filter_types)

    return [path for paths in directory_dict.values() for path in paths if path]


def read_file_to_df(file_path):
    df = pd.read_csv(file_path, encoding=detect_file_encoding(file_path))
    date = os.path.basename(file_path)[14:24]
    df['Time'] = df['Time'].apply(lambda x: date + ' ' + x)
    return df


def read_files_and_save_csv(file_dir, month, save_dir):
    begin = datetime.datetime.now()
    base_dir = os.path.basename(file_dir)
    print(f"{datetime.datetime.now()}: 开始执行{base_dir}-{month}")
    all_files = read_excel_files(os.path.join(file_dir, month))
    df = pd.concat([read_file_to_df(file) for file in all_files], ignore_index=True)
    save_path = os.path.join(save_dir, base_dir, f'{month}.csv')
    os.makedirs(os.path.dirname(save_path), exist_ok=True)
    df.sort_values(by=['Time'], inplace=True)
    df.to_csv(save_path, encoding='utf8', index=False)
    print(f"{datetime.datetime.now()}: 执行{base_dir}-{month}结束,耗时{datetime.datetime.now() - begin}")


if __name__ == '__main__':
    begin = datetime.datetime.now()
    read_dir = r'/data/download/collection_data/1进行中/张崾先风电场-陕西-华电/tmp/second/excel_tmp/'
    save_dir = r'/data/download/collection_data/1进行中/张崾先风电场-陕西-华电/清理数据/20241217完整字段'
    read_dirs = list()
    for i in range(26, 42):
        read_dirs.append(os.path.join(read_dir, str(i)))

    for read_dir in read_dirs:
        begin = datetime.datetime.now()
        with multiprocessing.Pool(6) as pool:
            pool.starmap(read_files_and_save_csv, [(read_dir, i, save_dir) for i in os.listdir(read_dir)])

    print(f"{datetime.datetime.now()}: 执行结束,总耗时{datetime.datetime.now() - begin}")