from machine import I2C, Pin
import time
import json

safty_led = Pin(2, Pin.OUT)

# DS1307 I2C address
DS1307_ADDR = 0x68

# PIR sensor pin
pir = Pin(15, Pin.IN)

# Initialize I2C (I2C0: SDA=GP0, SCL=GP1)
i2c = I2C(
    0,
    scl=Pin(1),
    sda=Pin(0),
    freq=100000
)

# Convert BCD to Decimal
def bcd_to_dec(bcd):
    return (bcd >> 4) * 10 + (bcd & 0x0F)

# Read time from DS1307
def read_ds1307():
    data = i2c.readfrom_mem(DS1307_ADDR, 0x00, 7)

    seconds = bcd_to_dec(data[0] & 0x7F)
    minutes = bcd_to_dec(data[1])
    hours   = bcd_to_dec(data[2] & 0x3F)
    day     = bcd_to_dec(data[4])
    month   = bcd_to_dec(data[5])
    year    = bcd_to_dec(data[6]) + 2000

    return {
        "year": year,
        "month": month,
        "day": day,
        "hour": hours,
        "minute": minutes,
        "second": seconds
    }

print("PIR + DS1307 Motion-Based JSON Logger Started...\n")

motion_last_state = 0

while True:
    motion = pir.value()

    # Trigger only on new motion detection
    if motion == 1 and motion_last_state == 0:
        rtc_data = read_ds1307()
        safty_led.toggle()
        payload = {
            "event": "motion_detected",
            "timestamp": rtc_data
        }

        print(json.dumps(payload))

        # PIR needs a short delay to avoid repeat triggers
        time.sleep(2)

    motion_last_state = motion
    time.sleep(0.1)