import pymysql as mysql
import datetime
from datetime import datetime, timedelta
import hashlib
import os

def connect():
    try:
        db=mysql.connect(host='124.70.178.159',user='admin',passwd='Rc5345750.',port=3306)
        print("connect mysql success.")
        return db
    except Exception as e:
        print("can not connect service.")
        return None
    

# 获取北京时间
def get_date():
    now_time = datetime.utcnow()
    utc_time = now_time + timedelta(hours=8)  # UTC只是比北京时间提前了8个小时
    utc_time = utc_time.strftime("%Y%m%d")
    return utc_time

# 获取北京时间
def get_time():
    now_time = datetime.utcnow()
    utc_time = now_time + timedelta(hours=8)  # UTC只是比北京时间提前了8个小时
    utc_time = utc_time.strftime("%Y-%m-%d %H:%M:%S")
    return utc_time


# 获取数据md5
def md5(data:bytearray):
    m=hashlib.md5(data).hexdigest()
    # print(m)
    return m


# 获得主板sn号
def get_computer_sn():
    sn = os.popen("wmic bios get serialnumber").readlines()
    return sn[2].strip()


class sql:
    def __init__(self) -> None:
        self.download_path="download/"
        if not os.path.exists(self.download_path):
            os.makedirs(self.download_path)

    
    # 初始化返回True成功
    def init(self,table_name:str):
        self.db=connect()
        self.table_name=table_name
        if(self.db!=None):
            self.cur=self.db.cursor()
            self.cur.execute("use andy_data")
            self.cur.execute("select version()")
            a=self.cur.fetchone()
            print(a)
            self.create_table(self.table_name)
            return True
        return False

    # 创建表
    def create_table(self,table_name:str):
        cmd="""CREATE TABLE IF NOT EXISTS `{d1}`(
            `id` INT UNSIGNED AUTO_INCREMENT,
            `time` VARCHAR(30) NOT NULL,
            `name` VARCHAR(256) NOT NULL,
            `md5` VARCHAR(33) NOT NULL,
            `data` MEDIUMBLOB NOT NULL,
            `info` VARCHAR(512),
            PRIMARY KEY ( `id` )
            )ENGINE=InnoDB DEFAULT CHARSET=utf8;""".format(d1=table_name)

        self.cur.execute(cmd)

    # 插入数据
    def insert(self,file_name:str,info:str=""):
        s=file_name.split('.')
        if(len(s)<2):
            print("file name without type suffix,will not insert.")
            return
        with open(file_name,"rb") as f:
            d=f.read()
            md=md5(d)
            lis=self.show()
            if(len(lis)>0):
                if(lis[-1][3]==md):
                    print("the same file was saved,will not insert.")
                    return
            try:
                cmd="INSERT INTO {d1} (time,name,md5,data,info) VALUES (%s,%s,%s,%s,%s);".format(d1=self.table_name)
                self.db.begin()
                self.cur.execute(cmd,([get_time(),file_name,md,d,info]))
                self.db.commit()
                print("insert file success.")
            except Exception as e:
                self.db.rollback()
                print(str(e))

    # 查看数据
    def show(self):
        cmd= "select id,time,name,md5 from {d1};".format(d1=self.table_name)
        self.cur.execute(cmd)
        a=self.cur.fetchall()
        # for i in a:
        #     print(i[0],i[1],i[2],i[3])
        return a
    # 下载指定文件,返回文件路径
    def download(self,id:int):
        ack,name=self.exists(id)
        if(ack==True):
            print("the same file is exists,will not download.")
            return name
        cmd="select name,data from {d1} WHERE id={d2};".format(d1=self.table_name,d2=id)
        self.cur.execute(cmd)
        a=self.cur.fetchall()
        for i in a:
            ss=i[0].replace('\\','/')
            ss=ss.split('/')[-1].split('.')
            name=self.download_path+ss[0]+' -'+str(id)+'.'+ss[1]
            with open(name,'+bw') as f:
                f.write(i[1])
                return name
        print("can not find the file with id:",id)
        return ""
    
        # 获取md5
    def get_md5(self,id:int):
        cmd="select md5 from {d1} WHERE id={d2};".format(d1=self.table_name,d2=id)
        self.cur.execute(cmd)
        a=self.cur.fetchall()[0]
        return a[0]

        # 扫描文件
    def scan_files(self):
        path = self.download_path
        if not os.path.exists(path):
            os.makedirs(path)
        list=os.listdir(path)
        return list
    # 判断文件是否存在
    def exists(self,id:int):
        for i in self.scan_files():
            s=i.split('.')[-2].split('-')[-1]
            if(int(s)==id):
                with open(self.download_path+i,"rb") as f:
                    md=md5(f.read())
                    if(md==self.get_md5(id)):
                        return True,i
        return False,""


if __name__ == "__main__":
    s=sql()
    if(s.init("test_data")==True):
        s.insert("file\\check_result.csv")
        s.show()
        file=s.download(1)
        print("save file:",file)