import numpy as np
import librosa

def apply_equalizer(y, bass_gain, mid_gain, treble_gain, sr):
    # Simple EQ logic using band filters (can be improved)
    y_bass = librosa.effects.preemphasis(y) * (1 + bass_gain / 10)
    y_mid = y * (1 + mid_gain / 10)
    y_treble = librosa.effects.preemphasis(y[::-1])[::-1] * (1 + treble_gain / 10)
    return (y_bass + y_mid + y_treble) / 3

def apply_pitch_shift(y, sr, n_steps):
    return librosa.effects.pitch_shift(y, sr=sr, n_steps=n_steps)

def extract_lyrics(file):
    content = file.read().decode('utf-8')
    return f"<pre>{content}</pre>"