import numpy as np
import pyworld
from scipy.io import wavfile


class FeatureInput(object):
    def __init__(self, samplerate=16000, hop_size=160):
        self.fs = samplerate
        self.hop = hop_size

        self.f0_bin = 256
        self.f0_max = 1100.0
        self.f0_min = 50.0
        self.f0_mel_min = 1127 * np.log(1 + self.f0_min / 700)
        self.f0_mel_max = 1127 * np.log(1 + self.f0_max / 700)

    def compute_f0(self, audio, sr):
        x, sr = audio, self.fs
        assert sr == self.fs
        f0, t = pyworld.dio(
            x.astype(np.double),
            fs=sr,
            f0_ceil=800,
            frame_period=1000 * self.hop / sr,
        )
        f0 = pyworld.stonemask(x.astype(np.double), f0, t, self.fs)
        for index, pitch in enumerate(f0):
            f0[index] = round(pitch, 1)
        return f0

    # for numpy # code from diffsinger
    def coarse_f0(self, f0):
        f0_mel = 1127 * np.log(1 + f0 / 700)
        f0_mel[f0_mel > 0] = (f0_mel[f0_mel > 0] - self.f0_mel_min) * (
                self.f0_bin - 2
        ) / (self.f0_mel_max - self.f0_mel_min) + 1

        # use 0 or 1
        f0_mel[f0_mel <= 1] = 1
        f0_mel[f0_mel > self.f0_bin - 1] = self.f0_bin - 1
        f0_coarse = np.rint(f0_mel).astype(np.int)
        assert f0_coarse.max() <= 255 and f0_coarse.min() >= 1, (
            f0_coarse.max(),
            f0_coarse.min(),
        )
        return f0_coarse

    # for tensor # code from diffsinger
    def coarse_f0_ts(self, f0):
        f0_mel = 1127 * (1 + f0 / 700).log()
        f0_mel[f0_mel > 0] = (f0_mel[f0_mel > 0] - self.f0_mel_min) * (
                self.f0_bin - 2
        ) / (self.f0_mel_max - self.f0_mel_min) + 1

        # use 0 or 1
        f0_mel[f0_mel <= 1] = 1
        f0_mel[f0_mel > self.f0_bin - 1] = self.f0_bin - 1
        f0_coarse = (f0_mel + 0.5).long()
        assert f0_coarse.max() <= 255 and f0_coarse.min() >= 1, (
            f0_coarse.max(),
            f0_coarse.min(),
        )
        return f0_coarse

    def save_wav(self, wav, path):
        wav *= 32767 / max(0.01, np.max(np.abs(wav))) * 0.6
        wavfile.write(path, self.fs, wav.astype(np.int16))