# created by Larry Streck and Miah Nelson
# Inspired by Idris Zainal Abidin's project at 
# https://www.cytron.io/tutorial/metronome-maker-pi-pico-programmed-with-circuitpython
# The LCD1602 library is based on the LAFVIN LCD1602 tutorial 
# https://lafvintech.com/pages/tutorials


import utime
import machine
from machine import Pin, I2C
from LCD1602 import LCD
import neopixel

def button_increase_handler(pin):
    global bpm, beat_duration
    utime.sleep_ms(20)  # debounce delay
    if not pin.value():
        bpm += 1
        beat_duration = 60 / bpm
        lcd.write(0,0," Tempo: {} BPM  ".format(bpm))

def button_decrease_handler(pin):
    global bpm, beat_duration
    utime.sleep_ms(20)  # debounce delay
    if not pin.value():
        bpm -= 1
        beat_duration = 60 / bpm
        lcd.write(0,0," Tempo: {} BPM  ".format(bpm))

buzzer_pin = machine.Pin(18, machine.Pin.OUT)
led_pin = machine.Pin(28)
button_increase_pin = machine.Pin(20, machine.Pin.IN, machine.Pin.PULL_UP)
button_decrease_pin = machine.Pin(21, machine.Pin.IN, machine.Pin.PULL_UP)
num_leds = 1
led_strip = neopixel.NeoPixel(led_pin, num_leds)

adc=machine.ADC(26)
lcd = LCD(addr=0x27, blen=1, sda_pin = 4, scl_pin=5, freq=400000)
lcd.clear()
lcd.message("   For Lainey\n The Full Dirty")

button_increase_pin.irq(trigger=Pin.IRQ_FALLING, handler=button_increase_handler)
button_decrease_pin.irq(trigger=Pin.IRQ_FALLING, handler=button_decrease_handler)

def play_buzzer():
    for _ in range(10):
        buzzer_pin.value(1)
        utime.sleep_us(200)
        buzzer_pin.value(0)
        utime.sleep_us(200)

def play_different_sound():
    for _ in range(10):
        buzzer_pin.value(1)
        utime.sleep_us(500)
        buzzer_pin.value(0)
        utime.sleep_us(500)

def flash_led(color):
    led_strip[0] = color
    led_strip.write()
    utime.sleep(0.1)
    led_strip[0] = (0, 0, 0)
    led_strip.write()

bpm = 120
beat_duration = 60 / bpm
beat_count = 0

while True:
    if beat_count % 4 == 0:
        flash_led((0, 255, 0))
        play_buzzer()
    else:
        flash_led((255, 0, 0))
        play_different_sound()
    utime.sleep(beat_duration)
    beat_count += 1

    if beat_count == 4:
        beat_count = 0