#fs imports
from fastapi import FastAPI, HTTPException
from uvicorn import run as UR
from contextlib import asynccontextmanager

#sys imports
import argparse
import traceback
import sys
import asyncio
from time import time
from typing import List, Dict

#msh imports
from transport_serial import SerialTransport
from mesht_device import MeshtDevice
from mesht_models import *
from mesht_models import _wait_for_config_complete

class Servlet:
    app: FastAPI
    transport = None
    device: MeshtDevice
    pulse = 0
    
    channels: Dict[int, Channel] = {}
    nodes: Dict[int, Node] = {}
    message: List[Message] = []
    msh_state = NOT_CONNECTED

    def __init__(self, args):
        self.app = FastAPI(lifespan=self.lifespan)
        self.args = args
        if args.transport == "serial":
            self.transport = SerialTransport(port=args.serial_port, baudrate=args.serial_baudrate)
            self.device = MeshtDevice(self.transport)
            self.buildRoutes()

    def run(self):
        UR(self.app, host=self.args.host, port=self.args.port)#, reload = True)#todo

    @asynccontextmanager
    async def lifespan(self, app: FastAPI):
        print("server is started, now connect to mesh")
        asyncio.create_task(self.meshWorker())
        yield
        print("server is shutdown now")

    async def meshWorker(self):
        run = True
        while run:
            try:
                await self.device.start()
                self.msh_state = WAIT_CONFIG
                init_data = await _wait_for_config_complete(self.device)
                for from_radio in init_data:#todo check dubs
                    self.meshCollector(from_radio)

                while True:
                    self.msh_state = AVAILABLE
                    self.pulse = time()
                    from_radio, _ = await self.device.recv()
                    self.meshCollector(from_radio)
            except asyncio.exceptions.CancelledError:
                print("Web close")
                run = False
                pass
            except:
                self.msh_state = ERR
                print("Mesh worker is has error, reconnect to mesh device after seconds...")
                traceback.print_exc()
                self.msh_state = RECONNECT
                await asyncio.sleep(1)
            finally:
                await self.device.close()

    def meshCollector(self, from_radio):
        try:
            print(from_radio)
            if Channel.isThis(from_radio):
                print("Found channel packet")
                channel = Channel(from_radio)
                self.channels[channel.index] = channel
                return
            
            if Node.isThis(from_radio):
                print("Found node packet")
                node = Node(from_radio)
                self.nodes[node.num] = node
                return
            
            if Message.isThis(from_radio):
                print("Found message packet")
                self.message.append(Message(from_radio))

        except:
            print("cannot parse packet")
            traceback.print_exc()

    def buildRoutes(self):
        route = "/mesh/api"

        @self.app.get(route)
        async def root():
            return {"status": self.msh_state}
        
        @self.app.get(route + "/nodes")
        async def getNodeList():
            return [{"id": node.num, "name": str(node)} for node in self.nodes.values()]
        
        @self.app.get(route + "/nodes/{id}")
        async def getNodeInfo(id: int):
            if id in self.nodes:
                return self.nodes[id]
            else:
                raise HTTPException(404)
            
        @self.app.get(route + "/channels")
        async def getChannelList():
            return [channel for channel in self.channels.values()]
        
        @self.app.get(route + "/messages")#todo before after
        async def getMessages():
            return self.message
        
        @self.app.post(route + "/messages")
        #curl -X POST -d '{"txt":"test", "node_id":"xxxxxxxxxx"}' -H "Content-Type: application/json"  http://127.0.0.1:8868/mesh/api/messages
        async def postMessage(msg: NewMessage):
            if msg.node_id:
                return await self.device.sendMsgToDM(msg.txt, msg.node_id)
            else:
                return await self.device.sendMsgToChannel(msg.txt, msg.channel_id)

if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    #msh
    parser.add_argument("--transport", default="serial")
    parser.add_argument("--serial-port", default="/dev/tty.usbmodemD0CF1309D56C1")#todo
    parser.add_argument("--serial-baudrate", default=115200)
    #srv
    parser.add_argument("--host", default="0.0.0.0")
    parser.add_argument("--port", default=8868)
    args = parser.parse_args()

    if (args.transport == "serial"):
        Servlet(args).run()
    else:
        print("Exists only serial transport")
        sys.exit(1)