# LED Matrix Clock with Raspberry Pi Pico
from machine import Pin, SPI
import network
import utime
import sys
import ntptime
import max7219
import wlan

if(sys.platform=="esp32"):
  led = Pin(2, Pin.OUT)
  disp_sck  = 18 # default SCK of SPI(1)
  disp_mosi = 23 # default MOSI of SPI(1)
  disp_miso = 19  # not use
  disp_cs  = 5
  # 初始化 SPI
  spi = SPI(1, baudrate=10000000, polarity=1, phase=0, sck=Pin(disp_sck), mosi=Pin(disp_mosi), miso=Pin(disp_miso))
  # spi = SPI(1, baudrate=10000000, sck=Pin(4), mosi=Pin(2))
  cs = Pin(disp_cs, Pin.OUT)
elif(sys.platform=="rp2"):
  led = Pin("LED", Pin.OUT)
  disp_sck  = 2 # default SCK of SPI(0)
  disp_mosi = 3 # default MOSI of SPI(0)
  disp_miso = 4  # not use
  disp_cs  = 5
  spi = SPI(0, baudrate=10000000, polarity=1, phase=0, sck=Pin(disp_sck), mosi=Pin(disp_mosi))
  # 初始化 SPI
  cs = Pin(disp_cs, Pin.OUT)

INTERVAL = 1000  # millisecond

"""
  Unix time starts on Jan 1 1970. In seconds, that's 2208988800:
  (date(1970, 1, 1) - date(1900, 1, 1)).days * 24*60*60
  (70*365+17)*24*60*60 = 2208988800 =>UTC0
  28800 = 8*60*60
  2208960000 = 2208988800-28800
"""
# Optional UTC+8 offset time (seconds), if not set, UTC0
# Timezone offset (India = UTC +8:00)
UTC_OFFSET = 28800 # 8 * 60 * 60

# Colon draw function
def draw_colon(x):
    display.pixel(x, 2, 1)
    display.pixel(x, 5, 1)
    display.pixel(x+1, 2, 1)
    display.pixel(x+1, 5, 1)

def sync_time_with_retry():
  try:
    print("Syncing with NTP server...")
    ntptime.settime()
    # 獲取並顯示本地時間 (台灣時區 +8)
    # utime.localtime() 取得 UTC 時間，所以要加上 8 小時
    timer = utime.localtime(utime.time() + UTC_OFFSET)
    print("Time synchronized.")
    return timer
  except OSError as e:
    # print("Error syncing time:", e)
    if e.args[0] == 110: # ETIMEDOUT
      print("ETIMEDOUT error during time sync. Retrying in 5 seconds...")
      utime.sleep(5)
      sync_time_with_retry() # Recursive call to retry
    else:
      print(f"An unexpected error occurred: {e}")

# Start Function
if __name__ == '__main__':
  print("Hello, " + sys.platform + "!")

  # ========== CONNECT WIFI ==========
  wlan.connect_wifi() # Connecting to WiFi Router
  utime.sleep_ms(1000)

  # ========== NTP TIME SYNC ==========
  led.on()
  timer = sync_time_with_retry()  # Synchronize the time
  led.off()

  # ========== SPI MAX7219 ==========
  display = max7219.Matrix8x8(spi, cs, 8)  # 8 matrices
  display.brightness(5)

  lastTime = utime.ticks_ms()
  # ========== MAIN LOOP ==========
  while True:
    try:
      currTime = utime.ticks_ms()
      if (currTime - lastTime > INTERVAL):
        lastTime = currTime

        time_now = utime.localtime(utime.time() + UTC_OFFSET)

        hh = "{:02d}".format(time_now[3])
        mm = "{:02d}".format(time_now[4])
        ss = "{:02d}".format(time_now[5])

        # SERIAL PRINT
        message_str = "TIME: "+ hh + ":" + mm + ":" + ss
        print(message_str)

        # DISPLAY
        display.fill(0)
        display.text(hh, 0, 0, 1)
        draw_colon(18)
        display.text(mm, 22, 0, 1)
        draw_colon(40)
        display.text(ss, 44, 0, 1)
        display.show()

      utime.sleep_ms(100)
    except KeyboardInterrupt: # 使用者中斷執行(通常是輸入^C)
      print("Stop")
      break