from datetime import datetime
import time
import requests, json
import re

from structures.measurement import CurrentMeasurement

class Balluff():

  cpu_start_time = None
  cpu_last_time = None
  local_start_time = time.time()
  db = 1
  interval = 0.05
  url = "http://10.0.10.4/ports.jsn"
  port = 0

  def read(self):
    try:
      req = requests.get(self.url)
    except requests.exceptions.ConnectionError:
      return []
    timestamp = datetime.utcnow()
    response = json.loads(req.text)
    if not re.match("^DF210[01]$", response['ports'][self.port]['productId']):
      raise Exception("unsupported device " + response['ports'][self.port]['productId'])

    data = response['ports'][self.port]['processInputs'].split(" ")
    data = [int(x, 16) for x in data]
    status = data[16] << 8 | data[17]
    overload = data[18] << 8 | data[19]
    short = data[20] << 8 | data[21]
    limit = data[22] << 8 | data[23]
    buttons = data[24] << 8 | data[25]
    undervoltage = data[26] & 1
    voltage = data[28] << 8 | data[29]

    points = []
    for i in range(16):
      if status & (1 << i):
        points.append(CurrentMeasurement(timestamp, "IO", i, data[i] / 10))

    return points

  def read_continous(self):
    while True:
      points = self.read()
      for point in points:
        yield point