# Reference:
#  https://wokwi.com/projects/395700228833743873
#  https://wokwi.com/projects/359558101922696193 


from machine import I2C, Pin
from time import sleep
import utime

# OLED libray
from ssd1306 import SSD1306_I2C

# very important
# this modules needs to be saved in the Raspberry Pi Pico in order for the RTC to be used 
import ds1307

# I2C Initialisation:
# creating I2C objects, specifying the data (SDA) and clock (SCL) pins used in the Raspberry Pi Pico
# any SDA and SCL pins in the Raspberry Pi Pico can be used (check documentation for SDA and SCL pins)
i2c_rtc = I2C(0, scl=Pin(9), sda=Pin(8), freq=100000)


# I2C object
# creating an DS1307 RTC object using I2C
ds1307rtc = ds1307.DS1307(i2c_rtc, 0x68)

pix_res_x = 128
pix_res_y = 64

def init_i2c(scl_pin, sda_pin):  # GPIO 27=SCL, SDA=26 for OLED
    # Initialize I2C device
    i2c_dev = I2C(1, scl=Pin(scl_pin), sda=Pin(sda_pin), freq=200000)
    i2c_addr = [hex(ii) for ii in i2c_dev.scan()]
    
    if not i2c_addr:
        print('No I2C Display Found')
        sys.exit()
    else:
        print("I2C Address      : {}".format(i2c_addr[0]))
        print("I2C Configuration: {}".format(i2c_dev))
    
    return i2c_dev

def get_date_string():
    dt = ds1307rtc.datetime
    return str(dt[2]) + "." + str(dt[1]) + "." + str(dt[0])

def get_time_string():
    dt = ds1307rtc.datetime
    return str(dt[3]) + ":" + str(dt[4])+ ":" + str(dt[5])


def display_time(oled):
    while True:
            
        # Clear the specific line by drawing a filled black rectangle
        oled.fill_rect(5, 40, oled.width - 5, 8, 0)
        oled.text("Date:", 5, 10)
        oled.text(get_date_string(),5, 20)  
        oled.text("Time:", 5, 30)
        oled.text(get_time_string(),5, 40)
        oled.show()
        sleep(5)

def main():
    i2c_dev = init_i2c(scl_pin=27, sda_pin=26)
    oled = SSD1306_I2C(pix_res_x, pix_res_y, i2c_dev)
    
    while True:
        display_time(oled)

if __name__ == '__main__':
    main()