import sys

sys.path.insert(
    0, f"{__file__.rpartition('/')[0] or '.'}/../../../../frozen/Adafruit_CircuitPython_Wave"
)

import random
import audiocore
import synthio
from ulab import numpy as np
import adafruit_wave as wave

SAMPLE_SIZE = 1024
VOLUME = 32767
sine = np.array(
    np.sin(np.linspace(0, 2 * np.pi, SAMPLE_SIZE, endpoint=False)) * VOLUME,
    dtype=np.int16,
)

envelope = synthio.Envelope(attack_time=0.05, decay_time=8, release_time=0.25, sustain_level=0)
fast_decay_envelope = synthio.Envelope(
    attack_time=0.05, decay_time=0.25, release_time=0.25, sustain_level=0
)

synth = synthio.Synthesizer(sample_rate=48000)


# for a note without sustain phase,
# switching to an envelope with decay_time 0.25 is about the same as
# releasing with a release time of 0.25
def synthesize(synth):
    notes = (synthio.Note(frequency=440, waveform=sine, envelope=envelope),)
    synth.press(notes)
    yield 360
    notes[0].envelope = fast_decay_envelope
    yield 180
    synth.release_all()


def synthesize2(synth):
    notes = (synthio.Note(frequency=440, waveform=sine, envelope=envelope),)
    synth.press(notes)
    yield 360
    synth.release_all()
    yield 180


def chain(*args):
    for a in args:
        yield from a


# sox -r 48000 -e signed -b 16 -c 1 tune.raw tune.wav
with wave.open("envelope.wav", "w") as f:
    f.setnchannels(1)
    f.setsampwidth(2)
    f.setframerate(48000)
    for n in chain(synthesize(synth), synthesize2(synth)):
        for i in range(n):
            result, data = audiocore.get_buffer(synth)
            f.writeframes(data)