# MIDI Cable
# Black - Data
# White - VCC 3.3v
# Brown - GND

import time
import board
import busio
import adafruit_midi

from adafruit_midi.control_change import ControlChange
from adafruit_midi.note_off import NoteOff
from adafruit_midi.note_on import NoteOn



def init():
    print("init")
    global midi
    uart = busio.UART(board.TX, board.RX, baudrate=31250, timeout=0.001)  # init UART
    midi_in_channel = 2
    midi_out_channel = 1
    midi = adafruit_midi.MIDI(
        midi_in=uart,
        midi_out=uart,
        in_channel=(midi_in_channel - 1),
        out_channel=(midi_out_channel - 1),
        debug=False,
    )
    print("Default output channel:", midi.out_channel + 1)


def trig(note_nr):
    # print("trig: " + str(note_nr))
    midi.send(NoteOn(note_nr, 127))
    midi.send(NoteOff(note_nr, 0))


def subdiv(clk_bar, clk_bar_old, div, note_nr):
    div_ns = div_to_ns(div)
    clk_sub1_old = clk_bar_old % div_ns
    clk_sub1 = clk_bar % div_ns
    clk_sub1_diff = clk_sub1 - clk_sub1_old
    if clk_sub1_diff < 0:
        trig(note_nr)
        # note_buffer_on.append(NoteOn(note_nr, 127))
        # note_buffer_off.append(NoteOff(note_nr, 127))


def div_to_ns(div) -> int:
        # trig(note_nr)
    clk_pulse_per_second = 1000000000
    beat_per_bar = 4
    bar_ns = beat_per_bar / bpm * 60 * clk_pulse_per_second
    return bar_ns / div


def md_note(nr):
    '''1-16'''
    md_notes = [ 36,38,40,41,43,45,47,48,50,52,53,55,57,59,60,62 ]
    nr = min(nr,16)
    nr = max(nr,1)
    return md_notes[nr-1]


def md_selftest():
    for i in range(1,16 + 1):
        trig(md_note(i))
        time.sleep(0.2)


def main():
    print("main")
    bar_ns = div_to_ns(1)

    clk_bar = time.monotonic_ns() % bar_ns
    while True:
        clk_bar_old = clk_bar
        clk_bar = time.monotonic_ns() % bar_ns

        # md_selftest()

        # for i in range(1,16+1):
        #     subdiv(clk_bar, clk_bar_old, i, md_note(i))
        subdiv(clk_bar, clk_bar_old, 1, md_note(1))
        subdiv(clk_bar, clk_bar_old, 8, md_note(2))


        # for i in note_buffer_on:
        #     midi.send(i)
        #
        # for i in note_buffer_off:
        #     midi.send(i)
        #
        # note_buffer_on.clear()
        # note_buffer_off.clear()

bpm = 120
note_buffer_on = []
note_buffer_off = []

init()
main()