"""This module is responsible for wav file generation."""

import struct
import random
import io

import wave


def generate_wav(sample_length):
    large_wav_file = wave.open('large_wav_file.wav', 'w')
    large_wav_file.setparams((2, 2, 44100, 0, 'NONE', 'not compressed'))

    values = []
    b = io.BytesIO()

    for i in range(0, sample_length):
        value = random.randint(-32767, 32767)
        packed_value = struct.pack('h', value)
        values.append(packed_value)
        if (i % 200000) == 0:
            values_bytes = b''.join(values)
            b.write(values_bytes)
            values = []
    b.seek(0)
    while True:
        chunk = b.read(200000)
        if chunk == b'':
            break
        large_wav_file.writeframes(b.read())

    large_wav_file.close()

if __name__ == '__main__':
    generate_wav(500000000)