import time
import machine
from network import WLAN
import network
import urequests as requests

# Initial phase
INTERVAL = 30 # 30 seconds for cloud
POT = machine.ADC(26)
# Wifi Details
WIFI_SSID = "Wokwi-GUEST"
WIFI_PASS = ""
BASE_URL = "http://httpbin.org"
DEBUG = True

# Led to indicate data transmission to cloud
LED = machine.Pin("LED", machine.Pin.OUT)

def convertU16toVolts(raw: float, max_volt: float = 3.3) -> float:
  """
  Convert unsigned 16-bit value to voltage scale 0 - {max_volt} V
  """
  conversion_factor = max_volt / 65535
  volt = raw * conversion_factor
  # ...
  return volt

def dlog(data) -> None:
  if DEBUG:
    print(repr(data))
  return None

def sendData(keyvalues: list[tuple]) -> None:
  """
  Send data in HTTP get request.
  Only key-value data pairs
  """
  endpoint = "/get"
  queryparams = ""
  for i in range(len(keyvalues)):
    key, value = keyvalues[i]
    if i == 0:
      queryparams += "?"
    else:
      queryparams += "&"
    queryparams += f'{key}={value}'
  request_url = BASE_URL + endpoint + queryparams
  dlog(f"request: {request_url}")
  response = requests.get(request_url)
  dlog(f"response_statuscode: {response.status_code}")
  dlog(f"response_content: {response.content}")
  return None

def connectWifi() -> WLAN:
  """
  This function connects Pico W to wireless AP(Access Point)
  Connection process is shown in console.
  After succesful connection, the function shows LAN IP(ifconfig)
  if debuggin is on.
  """
  wlan = network.WLAN(network.STA_IF) # Mode => STA (usually number 1)
  print("Connecting to WiFi", end="")
  wlan.active(True)
  # print(WIFI_SSID, WIFI_PASS)
  wlan.connect(WIFI_SSID, WIFI_PASS) # connection parameters
  while not wlan.isconnected():
    print(".", end='')
    time.sleep(0.1)
  print("\nConnected!")
  if DEBUG:
    print(wlan.ifconfig())
  return wlan

# Operations "routines"
def main() -> None:
  time.sleep(1)
  print("Program starting.")
  wlan = connectWifi()
  while True:
    # blink LED
    LED.on()
    
    raw = POT.read_u16()
    volts = convertU16toVolts(raw)
    wipe = ' ' * 40
    
    # TODO send data to cloud
    queryparams: list[tuple] = [
      ("pot", str(raw)),
      ("volt", str(volts))
    ]
    sendData(queryparams)

    print(f'\r{wipe}\r', end='')
    print(f'Raw {raw}, Voltage {volts} V', end='')
    time.sleep(0.2)
    LED.off()
    time.sleep(INTERVAL)
  print("Program ending.")
  return None

main()