#!/usr/bin/env python3

import pymongo

import datetime

import os

yesterday = str(datetime.date.today() - datetime.timedelta(days=1))

def mongo2csv(db_name, ts_string=yesterday, column_handle=None, column_delete=None):

    '''

    :param db_name: 表名

    :param ts_string: 日期

    :param column_handle: 需要处理的列，

                        格式{k:v} ,

                        k:需要处理的列，

                        v：1.数字，即列表索引，取列表的第几个元素

                           2.字符串，即字典key，取子字典的某个value

                           3.join ，即需要将列表转为字符串

    :param column_delete: 需要删除的列

    :return:

    '''

    print('starting...')

    host = '127.0.0.1'

    port = 5600

    user = 'root'

    password = ''

    url = 'mongodb://' + user + ':' + password + '@' + host + ':' + str(port) + '/'

    client = pymongo.MongoClient(url)

    db = client.rental

    collection = db[db_name]

    select_condition = {'_id': 0, 'ts': 0}

    if not column_delete:

        column_delete = []

    if not column_handle:

        column_handle = {}

    if len(column_delete) > 0:

        for temp in column_delete:

            select_condition[temp] = 0

    title_dic = collection.find_one({'ts_string': ts_string}, select_condition)

    title = sorted(title_dic.keys())

    con = collection.find({'ts_string': ts_string}, select_condition)

    file_name = db_name + '_' + yesterday + '.csv'

    with open(file_name, 'a', encoding='utf8') as f:

        f.write(','.join(title) + '\n')

        for item in con:

            for k, v in column_handle.items():

                item[k] = item[k][v] if v != 'join' else (

                    '|'.join([str(x) for x in item[k]]) if isinstance(item[k], list) else item[k])

            f.write(','.join([str(item[x]) for x in title]) + '\n')

if __name__ == '__main__':

     mongo2csv('lianjia_detail')

     mongo2csv('mogu_detail', column_handle={'metroInfo': 0, 'rentType': 'value'})

     mongo2csv('qingke_detail', column_handle={})

     mongo2csv('xiangyu_detail', column_delete=['endDate','vacantStartDate','tabList','vacantEndDate'])

     mongo2csv('ziru_detail', column_handle={'subway_line_code': 'join', 'subway_station_code': 'join'})

     print(os.system('wc -l *.csv'))