#coding: utf-8
# Print temp,pressure,hum,timestamp in a line.

import os, smbus
from datetime import datetime, timedelta

bus_number  = 1
i2c_address = 0x76

bus = smbus.SMBus(bus_number)

digT = []
digP = []
digH = []

t_fine = 0.0


def writeReg(reg_address, data):
  bus.write_byte_data(i2c_address,reg_address,data)

def get_calib_param():
  calib = []

  for i in range (0x88,0x88+24):
    calib.append(bus.read_byte_data(i2c_address,i))
  calib.append(bus.read_byte_data(i2c_address,0xA1))
  for i in range (0xE1,0xE1+7):
    calib.append(bus.read_byte_data(i2c_address,i))

  digT.append((calib[1] << 8) | calib[0])
  digT.append((calib[3] << 8) | calib[2])
  digT.append((calib[5] << 8) | calib[4])
  digP.append((calib[7] << 8) | calib[6])
  digP.append((calib[9] << 8) | calib[8])
  digP.append((calib[11]<< 8) | calib[10])
  digP.append((calib[13]<< 8) | calib[12])
  digP.append((calib[15]<< 8) | calib[14])
  digP.append((calib[17]<< 8) | calib[16])
  digP.append((calib[19]<< 8) | calib[18])
  digP.append((calib[21]<< 8) | calib[20])
  digP.append((calib[23]<< 8) | calib[22])
  digH.append( calib[24] )
  digH.append((calib[26]<< 8) | calib[25])
  digH.append( calib[27] )
  digH.append((calib[28]<< 4) | (0x0F & calib[29]))
  digH.append((calib[30]<< 4) | ((calib[29] >> 4) & 0x0F))
  digH.append( calib[31] )

  for i in range(1,2):
    if digT[i] & 0x8000:
      digT[i] = (-digT[i] ^ 0xFFFF) + 1

  for i in range(1,8):
    if digP[i] & 0x8000:
      digP[i] = (-digP[i] ^ 0xFFFF) + 1

  for i in range(0,6):
    if digH[i] & 0x8000:
      digH[i] = (-digH[i] ^ 0xFFFF) + 1

def readData():
  data = []
  for i in range (0xF7, 0xF7+8):
    data.append(bus.read_byte_data(i2c_address,i))
  pres_raw = (data[0] << 12) | (data[1] << 4) | (data[2] >> 4)
  temp_raw = (data[3] << 12) | (data[4] << 4) | (data[5] >> 4)
  hum_raw  = (data[6] << 8)  |  data[7]

  t = compensate_T(temp_raw)
  p = compensate_P(pres_raw)
  h = compensate_H(hum_raw)
  ts = (datetime.now() + timedelta(hours=9)).strftime("%Y-%m-%d %H:%M:%S")
  print ",".join([t,p,h,ts])

def compensate_P(adc_P):
  global  t_fine
  pressure = 0.0

  v1 = (t_fine / 2.0) - 64000.0
  v2 = (((v1 / 4.0) * (v1 / 4.0)) / 2048) * digP[5]
  v2 = v2 + ((v1 * digP[4]) * 2.0)
  v2 = (v2 / 4.0) + (digP[3] * 65536.0)
  v1 = (((digP[2] * (((v1 / 4.0) * (v1 / 4.0)) / 8192)) / 8)  + ((digP[1] * v1) / 2.0)) / 262144
  v1 = ((32768 + v1) * digP[0]) / 32768

  if v1 == 0:
    return 0
  pressure = ((1048576 - adc_P) - (v2 / 4096)) * 3125
  if pressure < 0x80000000:
    pressure = (pressure * 2.0) / v1
  else:
    pressure = (pressure / v1) * 2
  v1 = (digP[8] * (((pressure / 8.0) * (pressure / 8.0)) / 8192.0)) / 4096
  v2 = ((pressure / 4.0) * digP[7]) / 8192.0
  pressure = pressure + ((v1 + v2 + digP[6]) / 16.0)

  return "%7.2f" % (pressure/100)

def compensate_T(adc_T):
  global t_fine
  v1 = (adc_T / 16384.0 - digT[0] / 1024.0) * digT[1]
  v2 = (adc_T / 131072.0 - digT[0] / 8192.0) * (adc_T / 131072.0 - digT[0] / 8192.0) * digT[2]
  t_fine = v1 + v2
  temperature = t_fine / 5120.0
  return "%-6.2f" % (temperature)

def compensate_H(adc_H):
  global t_fine
  var_h = t_fine - 76800.0
  if var_h != 0:
    var_h = (adc_H - (digH[3] * 64.0 + digH[4]/16384.0 * var_h)) * (digH[1] / 65536.0 * (1.0 + digH[5] / 67108864.0 * var_h * (1.0 + digH[2] / 67108864.0 * var_h)))
  else:
    return 0
  var_h = var_h * (1.0 - digH[0] * var_h / 524288.0)
  if var_h > 100.0:
    var_h = 100.0
  elif var_h < 0.0:
    var_h = 0.0
  return "%6.2f" % (var_h)


def setup():
  osrs_t = 1      #Temperature oversampling x 1
  osrs_p = 1      #Pressure oversampling x 1
  osrs_h = 1      #Humidity oversampling x 1
  mode   = 3      #Normal mode
  t_sb   = 5      #Tstandby 1000ms
  filter = 0      #Filter off
  spi3w_en = 0      #3-wire SPI Disable

  ctrl_meas_reg = (osrs_t << 5) | (osrs_p << 2) | mode
  config_reg    = (t_sb << 5) | (filter << 2) | spi3w_en
  ctrl_hum_reg  = osrs_h

  writeReg(0xF2,ctrl_hum_reg)
  writeReg(0xF4,ctrl_meas_reg)
  writeReg(0xF5,config_reg)

def get_data():
  """
  Returns an array of [temperature,pressure,Humidity]
  """
  data = []
  for i in range (0xF7, 0xF7+8):
    data.append(bus.read_byte_data(i2c_address,i))
  pres_raw = (data[0] << 12) | (data[1] << 4) | (data[2] >> 4)
  temp_raw = (data[3] << 12) | (data[4] << 4) | (data[5] >> 4)
  hum_raw  = (data[6] << 8)  |  data[7]

  t = compensate_T(temp_raw)
  p = compensate_P(pres_raw)
  h = compensate_H(hum_raw)
  return [t,p,h]

def get_url_params():
  t,p,h = get_data()
  # Python's datetmie doesn't have timezone info.
  # You may need to set system timezone as UTC. (hint: sudo raspi-config)
  # Or you cam manually adjust timezone %z -> +09:00 (JST)
  ts = datetime.now().strftime("%Y-%m-%dT%H:%M:%S%z")
  s = "time_stamp=%s" % (ts)
  s += "&temperature=%s" % (t.strip())
  s += "&pressure=%s" % (p.strip())
  s += "&humidity=%s" % (h.strip())
  return s

# If you see "IOError: [Errno 121] Remote I/O error", uncomment the following line.
# os.system("/usr/sbin/i2cdetect -y 1 > /dev/null")
setup()
get_calib_param()

if __name__ == '__main__':
  try:
    if "MUKOYAMA_URL" in os.environ:
      url = os.environ["MUKOYAMA_URL"]
      id = os.environ["MUKOYAMA_ID"]
      token = os.environ["MUKOYAMA_TOKEN"]
      u = (url+"/temps/upload?id=%s&token=%s&"+get_url_params()) % (id,token)
      cmd = 'curl -s -S "'+u+'"'
      os.system(cmd)
    else:
      print("MUKOYAMA_URL is not set.")
      print(get_url_params())
  except KeyboardInterrupt:
    pass