from config import load_config
from pymongo import MongoClient
from pymongo.errors import ConnectionFailure
from urllib.parse import quote_plus
import pandas as pd

class MongoClientHelper:
    def __init__(self):
        self.cfgs = load_config()['mongodb']
        self.client = None
        self.db = None
        
        if self.client is None:
            self.connect()
        
    def connect(self):
        """连接MongoDB"""
        try:
            host = self.cfgs['host']
            port = self.cfgs['port']
            username = quote_plus(self.cfgs['username'])
            password = quote_plus(self.cfgs['password'])
            database = self.cfgs['database']
            
            uri = f"mongodb://{username}:{password}@{host}:{port}/{database}?authSource=admin"
            self.client = MongoClient(uri)
            self.db = self.client[database]
            
        except ConnectionFailure as e:
            print(f"MongoDB数据库连接失败: {e}")
            
    def find_one(self, collection_name, query):
        """根据条件查询一条结果"""
        collection = self.db[collection_name]
        return collection.find_one(query)
    
    def find_many(self, collection_name, query):
        """根据条件查询多条结果"""
        collection = self.db[collection_name]
        return collection.find(query)
    
    def find_all(self, collection_name):
        """返回mongdb中指定collection中的所有数据"""
        collection = self.db[collection_name]
        return collection.find()
    
    def find_fields(self, collection_name, fields):
        """获取指定字段的所有数据"""
        collection = self.db[collection_name]
        projection = {field: 1 for field in fields}
        projection["_id"] = 0
        return collection.find({}, projection)
            
if __name__ == "__main__":
    db_client = MongoClientHelper()
    collection_name = 'obrand-ec'
    query = {"nick": "李宁篮球旗舰店"}
    fields = ["nick"]
    res = db_client.find_fields(collection_name, fields)
    l = []
    for r in res:
        l.append(r)
    data = pd.DataFrame(l)
    print(data)