import os
import re
import socket
import threading

import msgpack

DATA_NODE_DEFAULT_PORT = 7777
DATA_HEAD = b"\xDD\xAA\xAA"
DEFAULT_IP_SEGMENT = r"192.168.137.(?!255)[0-9]{1,3}"


# 获得自身的ip地址
def get_self_ip_address():
    ip_list = get_machine_ip_address()
    return ip_list[0]


# 获得同个网段下的设备
def get_machine_ip_address():
    echo = os.popen("arp -a").read()
    return re.findall(DEFAULT_IP_SEGMENT, echo)


def send_2(domain, data, port=DATA_NODE_DEFAULT_PORT):
    data_bytes = msgpack.dumps(data)
    data_len = len(data_bytes)
    len_bytes = int.to_bytes(data_len, 3, byteorder="big")
    data_body = DATA_HEAD + len_bytes + data_bytes
    try:
        client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        # client.bind((get_self_ip_address(), 0))
        client.bind((DataNode.SELF_IP, 0))
        client.settimeout(1)
        client.connect((domain, port))
        client.send(data_body)
        client.close()
        return True
    except Exception as e:
        # print(e)
        return False


class DataNode(threading.Thread):
    SELF_IP = "0.0.0.0"

    def __init__(self, domain="0.0.0.0", port=DATA_NODE_DEFAULT_PORT, report=False) -> None:
        super().__init__(daemon=True)
        self.report = report
        self.domain = domain
        self.tcp_server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.tcp_server.bind((self.domain, port))
        self.tcp_server.listen(1024)
        self.tcp_server.settimeout(1)
        self.data = b""
        self.package = []
        self.__running = threading.Event()  # 用于停止线程的标识
        self.__running.set()  # 将running设置为True
        self.__had_data = threading.Event()
        self.__had_data.clear()

    def get_data(self):
        if self.package:
            return self.package.pop(0)

    def clear_data(self):
        self.data = b""
        self.package.clear()

    def _thread_data_processing(self):
        while self.__running.is_set():
            self.__had_data.wait()
            while self.data:
                head = re.search(DATA_HEAD + b"(.|\n|\r){3}", self.data)
                if not head:
                    continue
                data_start = head.end()
                data_len_mes = head.group()[3:6]
                high_byte = data_len_mes[0]
                middle_byte = data_len_mes[1]
                low_byte = data_len_mes[2]
                data_len = high_byte * 256 * 256 + middle_byte * 256 + low_byte
                data_end = data_start + data_len
                data_bytes = self.data[data_start: data_end:]
                # 解析数据
                try:
                    data = msgpack.loads(data_bytes)
                except:
                    continue
                self.package.append(data)
                # 更新数据
                self.data = self.data[data_end::]
            self.__had_data.clear()

    def start(self) -> None:
        super().start()
        threading.Thread(target=self._thread_data_processing, daemon=True).start()

    def run(self) -> None:
        while self.__running.is_set():
            # 等待客户端连接
            connected_addr = None
            try:
                conn, connected_addr = self.tcp_server.accept()
                conn: socket.socket
                conn.settimeout(1)
                if self.report:
                    print("[Data Node]{} connected!".format(connected_addr))
                while True:
                    try:
                        data = conn.recv(8192)
                        if data:
                            # print("receive", data)
                            self.data += data
                            self.__had_data.set()
                        else:
                            if self.report:
                                print("[Data Node]{} disconnected!".format(connected_addr))
                            break
                    except socket.timeout:
                        continue
                    except:
                        if self.report:
                            print("[Data Node]{} disconnected!".format(connected_addr))
                        break
            except socket.timeout:
                if connected_addr:
                    if self.report:
                        print("[Data Node]{} disconnected!".format(connected_addr))
            except ConnectionResetError:
                if connected_addr:
                    if self.report:
                        print("[Data Node]{} disconnected!".format(connected_addr))
            except Exception as e:
                if connected_addr:
                    if self.report:
                        print("[Data Node]{} disconnected!".format(connected_addr))

        self.tcp_server.close()

    def stop(self):
        try:
            self.__running.clear()
            self.tcp_server.close()
        except:
            return