#!/usr/bin/env python3
# coding:utf-8
import socketserver
import subprocess
import pickle
from collections import defaultdict
import datetime
import time
import requests
# import json


SERVER = "http://www.pushplus.plus/send"
TOKEN = "ff328cba923a4225bc4acd0086a9014c"
# SERVER = "http://push.nmhd.eu.org:12722/push/murmur"
# TOKEN = "tt"

def pp2wx(title,content,description):
    """通过pushplus发送至微信，有频次限制.
    title:标题
    content:内容"""

    ppmsg = {"token":TOKEN,
"template":"json",
"channel":"wechat",
"description": description,
}
    ppmsg["title"] = title
    ppmsg["content"] = content
    # ppmsg["description"]= content
    requests.post(SERVER, json=ppmsg)

def s2wx(title,description, content):
    """通过自建msgpusher发送至微信
    当前title值无效
    """
    # pass
    # GET 方式
    # res = requests.get(f"{SERVER}/push/{USERNAME}?title={title}"
    #                    f"&description={description}&content={content}&token={TOKEN}")

    # POST 方式
    res = requests.post("http://push.nmhd.eu.org:12722/push/murmur", json={
        "title": title,
        "description": description,
        "content": f"""
### 时间戳：  
{datetime.datetime.now()}  
{content}""",
        "token": "tt"
    })
    res = res.json()
    if res["success"]:
        return None
    else:
        return res["message"]


cache = defaultdict(list)
offs = 0  # 偏移量

# 保存终端信息，ccid=地址
p = {}
# 地址 ==ccid
pp = {}


def add_timestamp():
    print("-------------------------↓",datetime.datetime.now(), "↓-------------------------")


def save_cache(dic):
    """缓存未发送成功的消息
    仅在目标终端未上线或发送失败时缓存
    发送失败的一般原因是终端掉线但未及时更新在线列表"""

    # f=open("./cache.txt",mode='w+')
    # f.write(str(dic))
    # f.close
    pickle.dump(dic, open("./cache.txt", "wb"))


def load_cache():
    """程序启动时加载缓存"""
    try:
        # f=open("./cache.txt")
        # c = eval(f.read())
        # f.close()
        c = pickle.load(open("./cache.txt", "rb"))
        return c
    except:
        return None


def update_pairs(addr, ccid, clear=0):
    """更新终端库
    addr:绑定tcp地址
    ccid:终端号
    clear:清空掉线终端"""

    if ccid and not clear:
        # 添加或更新客户端
        if ccid not in p:
            t = f"""
### **终端信息:**  
CCID:{ccid.decode()}  
地址:{str(addr.getpeername())}
            """
            s2wx("","天通终端上线了",t)
        p[ccid] = addr
        pp[addr] = ccid
    else:
        del p[ccid]
        del pp[addr]

    print("在线终端已更新。")
    # 打印在线终端
    for i in p:
        print(i, "<--->", p[i])
    # for i in pp:
    #     print(i,"-",pp[i])


def get_addr(ccid):
    """获取ccid对应的地址"""

    try:
        # 如果有直接返回
        return p[ccid]
    except Exception:
        # 没有就返回None
        return None


def get_ccid(addr):
    try:
        # 如果有直接返回
        return pp[addr]
    except Exception:
        # 没有就返回None
        print("终端未上报心跳注册ccid。")
        return None


"""
+--------+--------------+----------+----------+--------------+------------------------+--------+
|   ff   |     长度     | 地址信息 |          信令           |          内容          | 校验位 |
+--------+--------------+----------+----------+--------------+------------------------+--------+
|        |    2Bytes    |  4Bytes  |   心跳   |     0x01     | 时间戳32bit（单位ms）  | 1Bytes |
+ $TTMS  +--------------+----------+----------+--------------+------------------------+--------+
|        |    2Bytes    |  4Bytes  | 传输数据 |     0xaa     |          载荷          | 1Bytes |
+--------+--------------+----------+----------+--------------+------------------------+--------+
"""


def tt_hh(addr, data):
    """处理心跳"""

    # 更新pairs
    ccid = data[7 + offs : 11 + offs]
    update_pairs(addr, ccid)
    # 组帧再返回
    msg = bytearray(data[:])
    val = "%04x" % int(time.time())
    tmp=[]
    for i in range(0,len(val),2):
        tmp.append(int(val[i:i+2],16))
    msg[12:-1] = tmp
    # 计算校验和
    crc = 0
    for i in msg[:-1]:
        crc = crc ^ i
    msg[-1] = crc
    add_timestamp()
    addr.send(msg)
    print("服务器回复心跳包。")

    # 从缓存中匹配到数据才重发
    # 仅有新终端上线时才重发
    if cache and ccid in cache:
        msgs = cache[ccid][:]  # 浅拷贝
        sccid = msgs[0][7 + offs : 11 + offs]
        print("有", len(msgs), "包缓存数据待发。", sccid, "-->", ccid)
        for i in range(len(msgs)):
            try:
                add_timestamp()
                # 按缓存先后顺序发送
                addr.send(msgs[i])
                # 成功则清空已发送成功的缓存数据
                cache[ccid].pop(0)
                print("第", i + 1, "包缓存数据发送完成。")
            except:
                # 异常时退出循环，不用再尝试发送后续msgs
                print("第", i + 1, "包发送失败，停止尝试")
                break
        if cache[ccid] == []:
            print("缓存数据全部发送完成。", sccid, "-->", ccid)
            del cache[ccid]
        save_cache(cache)

    return 0


def check_valid(data):
    # 检查数据有效性

    return bytearray(data[:])


def tt_trans(addr, data):
    """发送数据到指定ccid"""

    sccid = get_ccid(addr)
    if not sccid:
        return -1
    tccid = data[7 + offs : 11 + offs]
    taddr = get_addr(tccid)
    # 组帧
    msg = check_valid(data)
    msg[:5] = b"$TTMX"
    msg[7 + offs : 11 + offs] = sccid

    # 计算校验和
    crc = 0
    for i in msg[:-1]:
        crc = crc ^ i
    msg[-1] = crc

    if not taddr:
        # 未找到匹配的在线终端

        # 更新缓存
        # {tccid1=[msg1,msg2,...],...}
        cache[tccid].append(msg)
        save_cache(cache)

        print("终端未在线或ccid", tccid, "错误。数据已缓存，待目标终端上线后重发。")
        return 0
    print("匹配在线终端为：", tccid, "<--->", taddr)

    # 发送
    try:
        add_timestamp()
        taddr.send(msg)
        print("数据发送成功。", sccid, "-->", tccid)
    except Exception:
        # 发送失败
        taddr.close()
        # 更新pairs，清空对应终端
        update_pairs(taddr, tccid, 1)
        # 更新缓存
        # {tccid1=[msg1,msg2,...],...}
        cache[tccid].append(msg)
        save_cache(cache)

        print("发送失败，终端可能已掉线。数据已缓存，待目标终端上线后重发。", taddr)
    return 0


def data_split(data):
    # 按帧头分割长数据

    h = b"$TTMS"  # b'\x24\x54\x54\x4d\x53'
    dlist = data.split(h)[1:]
    for i in range(len(dlist)):
        dlist[i] = h + dlist[i]
    print("解析为", len(dlist), "包数据。")
    return dlist


def tt_decode(addr, data):
    """处理收到的数据

    数据正常返回0
    数据异常返回-1"""

    flag = -1

    # 依据帧头和最小长度初判数据有效性
    # 只要接收数据给的缓存足够大，即使是多条数据组成的长数据也默认帧格式是完整的，前几个字节必须是帧头
    if data[:5] != b"$TTMS" or len(data) < 12:
        return -1

    dlist = data_split(data)
    for data in dlist:
        cmd = data[11 + offs]
        # 回退到if-elif而不用match，因服务器默认版本3.8
        if cmd == 0x01:
            # 处理心跳
            flag = tt_hh(addr, data)
        elif cmd == 0xAA:
            # 处理数据
            if tt_trans(addr, data):
                flag = -1
                break
            else:
                flag = 0
        else:
            break
    return flag


class MyServer(socketserver.BaseRequestHandler):
    def setup(self):
        self.server.timeout=3

    def handle(self):  # 回调
        add_timestamp()
        print("客户端", self.client_address, "已连接，等待上报心跳注册ccid。")
        s2wx("天通消息","TCP客户端已连接",str(self.client_address) +  "已连接，等待上报心跳注册ccid。")
        conn = self.request
        # print(type(conn),conn.fd)

        while True:
            data = conn.recv(1024000)
            if not data:
                break
            add_timestamp()
            print(
                "接收到新数据", self.client_address, "，长度", len(data), "：\r\n", data.hex(" ")
            )
            if tt_decode(conn, data):
                conn.close()
                print(self.client_address, "疑是非法连接，已切断。")
                break
    
    def finish(self):
        
        if self.request in pp:
            t = f"""
### **终端信息:**  
CCID:{get_ccid(self.request)}  
地址:{str(self.client_address)}
            """
            s2wx("","天通终端下线了",t)
            print("终端",self.client_address,"下线了。")
            update_pairs(self.request,get_ccid(self.request),1)
        else:
            print("客户端",self.client_address,"已断开连接。")
            s2wx("天通消息","TCP客户端断开",str(self.client_address) +  "已断开连接。")




if __name__ == "__main__":
    # load_cache
    cache = load_cache()

    server = socketserver.ThreadingTCPServer(("", 7222), MyServer)
    add_timestamp()
    print("服务端初始化成功。", server.server_address)
    server.timeout = 10
    server.serve_forever()


"""
以下几种情况服务器会主动断开终端：
单次数据不以帧头开始
单次数据长度不足11
未上报心跳（注册ccid）而直接发数据
"""