# Reference: https://qiita.com/kotaproj/items/3b974425dfa2579afdbc
# https://docs.blynk.io/en/blynk.cloud/device-https-api/update-datastream-value

from machine import Pin,unique_id
import network
import time
import usocket as socket
import ussl as ssl
import ubinascii
import urandom as random
import os

# AP
WIFI_SSID1 = '1234' # "Your network name";
WIFI_PASS1 = '5678' # "Your network password";
WIFI_SSID2 = "2345" # Your WiFi SSID
WIFI_PASS2 = "6789" # Your WiFi Password
WIFI_SSID3 = "3456" # Your WiFi SSID
WIFI_PASS3 = "7890" # Your WiFi Password
# WIFI_SSID = "Wokwi-GUEST"
# WIFI_PASS = ""

# Fill-in information from Blynk Device Info here
BLYNK_TEMPLATE_ID =  "TMPL6Bxg96QSE"
BLYNK_TEMPLATE_NAME = "ESP32LED"
BLYNK_AUTH_TOKEN  = "XoNXUD1WSva6Jmuj9HPyeBr5Sx8ogbWj"

HOST = "blynk.cloud"       # 伺服器網址，不可動
PORT = 443 # https

button_down = False
button_up = False
GPIO_PIN = 2  # 使用D4腳位

def randint(min, max):
  span = max - min + 1
  div = 0x3FFFFFFF // span
  offset = random.getrandbits(30) // div
  val = min + offset
  return val

def connect_wifi():
  print("Scanning for WiFi networks, please wait...")
  wifi = network.WLAN(network.STA_IF)
  wifi.active(True)

  num = 0
  for (ssid, bssid, channel, RSSI, authmode, hidden) in wifi.scan():
    if WIFI_SSID1 in ssid:
      WIFI_SSID = WIFI_SSID1        # Your WiFi SSID
      WIFI_PASS = WIFI_PASS1    # Your WiFi Password
      num=1
      break
    elif WIFI_SSID2 in ssid:
      WIFI_SSID = WIFI_SSID2       # Your WiFi SSID
      WIFI_PASS = WIFI_PASS2   # Your WiFi Password
      num=2
      break
    elif WIFI_SSID3 in ssid:
      WIFI_SSID = WIFI_SSID3       # Your WiFi SSID
      WIFI_PASS = WIFI_PASS3   # Your WiFi Password
      num=3
      break
    elif "Wokwi-GUEST" in ssid:
      WIFI_SSID = "Wokwi-GUEST"
      WIFI_PASS = ""
      num=4
      break

  if (num == 0):
    print("Couldn't get a wifi connection")
    while True:
      pass

  # authmodes = ['Open', 'WEP', 'WPA-PSK' 'WPA2-PSK4', 'WPA/WPA2-PSK']
  print("* {:s}".format(ssid))
  # print("   - Auth: {} {}".format(authmodes[authmode], '(hidden)' if hidden else ''))
  print("   - Channel: {}".format(channel))
  print("   - RSSI: {}".format(RSSI))
  print("   - BSSID: {:02x}:{:02x}:{:02x}:{:02x}:{:02x}:{:02x}".format(*bssid))

  if not wifi.isconnected():
    print('connecting to network...')
    wifi.connect(WIFI_SSID, WIFI_PASS)
    while not wifi.isconnected():
      time.sleep(1)
  print('network config:', wifi.ifconfig())

  return

# Function to handle button press interrupt (optional)
def button_press(pin):
  global button_down
  led2_pin.value(not led2_pin.value())
  button_down = True

def sendMessage(url):
  # 定義發送至伺服器的訊息內容
  message_str = "GET " + url + " HTTP/1.1\r\n" \
              + "Host: " + HOST + "\r\n" \
              + "Content-Type: application/x-www-form-urlencoded\r\n\r\n"

  addr = socket.getaddrinfo(HOST, PORT)[0][-1]  # 取得連線到伺服器的相關訊息
  print(addr)              # 顯示取得的address訊息內容

  try:
    Socket1 = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  # Create STREAM TCP socket
    print("connecting to server")
    Socket1.connect(addr)          # 與伺服器進行連線
    print("server is connected")
    time.sleep_ms(1000)
    ssl_sock = ssl.wrap_socket(Socket1)    # SSL wrap
    ssl_sock.write(message_str)    # send data
    print("send done")
    time.sleep_ms(1000)
    Socket1.close()            # 關閉與伺服器的連線，避免佔用端口。
  except:
    print("except")
    time.sleep_ms(1000)

# Start Function
if __name__ == '__main__':
  print(os.uname())
  print("Hello, " + os.uname().sysname + "!")
  # ESP32 unique ID
  CLIENT_ID = ubinascii.hexlify(unique_id())
  print("Unique ID: ", end="")
  print(CLIENT_ID)

  # Define GPIO pins for LED and push button
  led1_pin = Pin(4, Pin.OUT)
  led2_pin = Pin(2, Pin.OUT)
  led1_pin.value(False)
  led2_pin.value(False)
  button_pin = Pin(35, Pin.IN, Pin.PULL_UP)  # Internal pull-up resistor

  # Attach interrupt to the push button pin
  button_pin.irq(trigger=Pin.IRQ_FALLING, handler=button_press)

  connect_wifi()

  while True:
    led1_pin.value(not led1_pin.value())
    if button_down == True:
      temp=randint(1,50)
      humi=randint(1,100)
      # /external/api/update?token={token}&pin=V1&value=lon&value=lat
      API_URL = "/external/api/update?token=" + BLYNK_AUTH_TOKEN + "&V6=" + str(temp)
      print(API_URL)       # 顯示此訊息內容進行debug
      sendMessage(API_URL)            # 執行此函數

      button_down = False

    # Do other tasks while waiting for button press
    time.sleep_ms(100)