from json import loads as json_parse, dumps as _json_stringify
from socket import if_nametoindex
from typing import Dict, List, Optional, Any
from xml.dom.expatbuilder import parseString
import paho.mqtt.client as mqtt
from biopro.text import *
from .task import Task

_RUNTIME_COMPILE = False

def json_stringify(o: Any) -> str:
    return _json_stringify(o, separators=(',', ':'))

class TaskManager():
    def __init__(self, task_list):
      self._task_list = []
      self._next_task = []
      self._prev_task = None
      self._running_task = None
      
      self.load_task_list(task_list)

      # self.set_running_task(self._task_list[0])
      # self._running_task.run()
      self._next_task.append(self._task_list[0])
    
    @property
    def task_list(self):
      return self._task_list

    @property
    def export_task_list(self):
      return [d.as_json() for d in self._task_list]

    @property
    def prev_task(self):
      return self._prev_task
    
    @property
    def running_task(self):
      return self._running_task
    
    @property
    def next_task(self):
      return self._next_task

    @property
    def check_list(self):
      return [self._running_task, *self._next_task]
    
    @property
    def check_list(self):
      return [self._running_task, *self._next_task]
    
    def load_task_list(self, task_list):
      for task in task_list:
        task = Task(task) 
        self._task_list.append(task)
    
    def set_running_task(self, task):
      try:
        # if there is task running & same task active ,then reject
        if self._running_task != None and self._running_task.uuid == task.uuid:
          return False

        # save running task
        self._prev_task = self._running_task
        # clear next task list
        self._next_task.clear()
        self._running_task = task
        self._running_task.run()

        if self._prev_task != None:
          # if previous task is still running, then need to close
          if self._prev_task.status == 1:
            self._prev_task.stop()
          print('prev', 'run', self._prev_task.name, self._running_task.name)

        for task_uuid in self._running_task.next:
          _task = next((task for task in self._task_list if task.uuid == task_uuid), None)
          if _task != None:
            self._next_task.append(_task)
      except RuntimeError as e:
        print(e)

    def get_task(self, task_id):
      return self._task_list[task_id]