# SPDX-FileCopyrightText: 2023 John Park and @todbot / Tod Kurt
#
# SPDX-License-Identifier: MIT

import time
import board
import audiomixer
import digitalio
import synthio
import ulab.numpy as np

# for PWM audio with an RC filter
# import audiopwmio
# audio = audiopwmio.PWMAudioOut(board.GP10)

# for I2S audio with external I2S DAC board
import audiobusio

# I2S on Audio BFF or Amp BFF on QT Py:
# audio = audiobusio.I2SOut(bit_clock=board.A3, word_select=board.A2, data=board.A1)

# I2S audio on PropMaker Feather RP2040
power = digitalio.DigitalInOut(board.EXTERNAL_POWER)
power.switch_to_output(value=True)
audio = audiobusio.I2SOut(board.I2S_BIT_CLOCK, board.I2S_WORD_SELECT, board.I2S_DATA)

mixer = audiomixer.Mixer(channel_count=1, sample_rate=44100, buffer_size=4096)

amp_env_slow = synthio.Envelope(
                                attack_time=0.65,
                                sustain_level=1.0,
                                release_time=0.8
)
synth = synthio.Synthesizer(channel_count=1, sample_rate=44100, envelope=amp_env_slow)

audio.play(mixer)
mixer.voice[0].play(synth)
mixer.voice[0].level = 0.3

# create sine, tri, saw & square single-cycle waveforms to act as oscillators
SAMPLE_SIZE = 512
SAMPLE_VOLUME = 32000  # 0-32767
half_period = SAMPLE_SIZE // 2
wave_sine = np.array(np.sin(np.linspace(0, 2*np.pi, SAMPLE_SIZE, endpoint=False)) * SAMPLE_VOLUME,
                     dtype=np.int16)
wave_saw = np.linspace(SAMPLE_VOLUME, -SAMPLE_VOLUME, num=SAMPLE_SIZE, dtype=np.int16)
wave_tri = np.concatenate((np.linspace(-SAMPLE_VOLUME, SAMPLE_VOLUME, num=half_period,
                            dtype=np.int16),
                                np.linspace(SAMPLE_VOLUME, -SAMPLE_VOLUME, num=half_period,
                                dtype=np.int16)))
wave_square = np.concatenate((np.full(half_period, SAMPLE_VOLUME, dtype=np.int16),
                              np.full(half_period, -SAMPLE_VOLUME, dtype=np.int16)))

# note1 = synthio.Note( frequency = 220, waveform = wave_sine, amplitude=0.3)

detune = 0.003  # how much to detune
num_oscs = 1
midi_note = 52

while True:
    print("num_oscs:", num_oscs)
    notes = []  # holds note objs being pressed
    # simple detune, always detunes up
    for i in range(num_oscs):
        f = synthio.midi_to_hz(midi_note) * (1 + i*detune)
        notes.append(synthio.Note(frequency=f, waveform=wave_saw))
    synth.press(notes)
    time.sleep(3.6)
    synth.release(notes)
    time.sleep(0.1)
    # increment number of detuned oscillators
    num_oscs = num_oscs+1 if num_oscs < 5 else 1