import pandas as pd
from pymongo import MongoClient
from sqlalchemy import create_engine
from flask import Flask,request,jsonify
import time
import logging
import traceback
from functools import reduce

app = Flask('data_join——service')


@app.route('/hello', methods=['POST'])
def hello():
    return jsonify(message='Hello, World!')

def get_data_from_mongo(args):
    mongodb_connection,mongodb_database,mongodb_read_table = "mongodb://root:sdhjfREWFWEF23e@192.168.1.43:30000/",args['mongodb_database'],args['mongodb_read_table'].split(',')
    df_list = []
    client = MongoClient(mongodb_connection)
    # 选择数据库（如果数据库不存在，MongoDB 会自动创建）
    db = client[mongodb_database]
    for table in mongodb_read_table:
        collection = db[table]  # 集合名称
        data_from_db = collection.find()  # 这会返回一个游标（cursor）
        # 将游标转换为列表，并创建 pandas DataFrame
        df = pd.DataFrame(list(data_from_db))
        df_list.append(df)
    client.close()
    return df_list


def insert_data_into_mongo(res_df,args):
    mongodb_connection,mongodb_database,mongodb_write_table = "mongodb://root:sdhjfREWFWEF23e@192.168.1.43:30000/",args['mongodb_database'],args['mongodb_write_table']
    client = MongoClient(mongodb_connection)
    db = client[mongodb_database]
    if mongodb_write_table in db.list_collection_names():
        db[mongodb_write_table].drop()
        print(f"Collection '{mongodb_write_table} already exist, deleted successfully!")
    collection = db[mongodb_write_table]  # 集合名称
    # 将 DataFrame 转为字典格式
    data_dict = res_df.to_dict("records")  # 每一行作为一个字典
    # 插入到 MongoDB
    collection.insert_many(data_dict)
    print("data inserted successfully!")


#1.AGC/AVC信号判断限电（有的场站准 有的不准） 1种方法  数据库数据有问题 暂时用不了
def  data_join(df_list, args):
    join_key,join_type = args['join_key'], args['join_type']
    result = reduce(lambda left, right: pd.merge(left, right, how='join_type', on=join_key), df_list)
    return result


@app.route('/data_join', methods=['POST'])
def data_join():
    # 获取程序开始时间  
    start_time = time.time()  
    result = {}
    success = 0
    print("Program starts execution!")
    try:
        args = request.values.to_dict()
        print('args',args)
        logger.info(args)
        df_list = get_data_from_mongo(args)
        res_df = data_join(df_list,args)
        insert_data_into_mongo(res_df,args)
        success = 1
    except Exception as e:
        my_exception = traceback.format_exc()
        my_exception.replace("\n","\t")
        result['msg'] = my_exception
    end_time = time.time()
    result['success'] = success
    result['args'] = args
    result['start_time'] = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(start_time))
    result['end_time'] = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(end_time))
    print("Program execution ends!")
    return result


if __name__=="__main__":
    print("Program starts execution!")
    logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(name)s - %(levelname)s - %(message)s')
    logger = logging.getLogger("data_join")
    from waitress import serve
    serve(app, host="0.0.0.0", port=10094)
    print("server start!")