from machine import Pin, I2C
from time import sleep
import random
import lcd_api
import i2c_lcd

# I2C setup
i2c = I2C(0, sda=Pin(0), scl=Pin(1), freq=400000)

# Try 0x3F first, if not working → change to 0x27
lcd = i2c_lcd.I2cLcd(i2c, 0x27, 2, 16)

# Startup message
lcd.putstr("MAX30102 Sim")
sleep(2)
lcd.clear()

def read_max30102():
    red = random.randint(50000, 100000)
    ir = random.randint(50000, 100000)
    return red, ir

def calcul_bpm_spo2(red, ir):
    bpm = random.randint(60, 100)
    spo2 = round(random.uniform(95.0, 99.0), 1)
    return bpm, spo2

while True:
    red, ir = read_max30102()
    bpm, spo2 = calcul_bpm_spo2(red, ir)

    lcd.clear()
    sleep(0.1)

    lcd.move_to(0, 0)
    lcd.putstr("BPM: {}".format(bpm))

    lcd.move_to(0, 1)
    lcd.putstr("SpO2: {}%".format(spo2))

    sleep(1)