app.py

import gradio as gr
from pydub import AudioSegment
from pydub.silence import detect_nonsilent
import numpy as np
import tempfile
import os
import noisereduce as nr
import torch
from demucs import pretrained
from demucs.apply import apply_model
import torchaudio
from pathlib import Path
import matplotlib.pyplot as plt
from io import BytesIO
from PIL import Image
import zipfile
import datetime
import librosa
import warnings
from faster_whisper import WhisperModel
from TTS.api import TTS
import base64
import pickle
import json

# Suppress warnings
warnings.filterwarnings("ignore")

# === Helper Functions ===
def audiosegment_to_array(audio):
    return np.array(audio.get_array_of_samples()), audio.frame_rate

def array_to_audiosegment(samples, frame_rate, channels=1):
    return AudioSegment(
        samples.tobytes(),
        frame_rate=frame_rate,
        sample_width=samples.dtype.itemsize,
        channels=channels
    )

# === Effect Functions ===
def apply_normalize(audio):
    return audio.normalize()

def apply_noise_reduction(audio):
    samples, frame_rate = audiosegment_to_array(audio)
    reduced = nr.reduce_noise(y=samples, sr=frame_rate)
    return array_to_audiosegment(reduced, frame_rate, channels=audio.channels)

def apply_compression(audio):
    return audio.compress_dynamic_range()

def apply_reverb(audio):
    reverb = audio - 10
    return audio.overlay(reverb, position=1000)

def apply_pitch_shift(audio, semitones=-2):
    new_frame_rate = int(audio.frame_rate * (2 ** (semitones / 12)))
    samples = np.array(audio.get_array_of_samples())
    resampled = np.interp(np.arange(0, len(samples), 2 ** (semitones / 12)), np.arange(len(samples)), samples).astype(np.int16)
    return AudioSegment(resampled.tobytes(), frame_rate=new_frame_rate, sample_width=audio.sample_width, channels=audio.channels)

def apply_echo(audio, delay_ms=500, decay=0.5):
    echo = audio - 10
    return audio.overlay(echo, position=delay_ms)

def apply_stereo_widen(audio, pan_amount=0.3):
    left = audio.pan(-pan_amount)
    right = audio.pan(pan_amount)
    return AudioSegment.from_mono_audiosegments(left, right)

def apply_bass_boost(audio, gain=10):
    return audio.low_pass_filter(100).apply_gain(gain)

def apply_treble_boost(audio, gain=10):
    return audio.high_pass_filter(4000).apply_gain(gain)

def apply_noise_gate(audio, threshold=-50.0):
    samples = np.array(audio.get_array_of_samples())
    rms = np.sqrt(np.mean(samples**2))
    if rms < 1:
        return audio
    normalized = samples / np.max(np.abs(samples))
    envelope = np.abs(normalized)
    gated = np.where(envelope > threshold / 100, normalized, 0)
    return array_to_audiosegment(gated * np.iinfo(np.int16).max, audio.frame_rate, channels=audio.channels)

def apply_limiter(audio, limit_dB=-1):
    limiter = audio._spawn(audio.raw_data, overrides={"frame_rate": audio.frame_rate})
    return limiter.apply_gain(limit_dB)

def apply_auto_gain(audio, target_dB=-20):
    change = target_dB - audio.dBFS
    return audio.apply_gain(change)

def apply_vocal_distortion(audio, intensity=0.3):
    samples = np.array(audio.get_array_of_samples()).astype(np.float32)
    distorted = samples + intensity * np.sin(samples * 2 * np.pi / 32768)
    return array_to_audiosegment(distorted.astype(np.int16), audio.frame_rate, channels=audio.channels)

def apply_harmony(audio, shift_semitones=4):
    shifted_up = apply_pitch_shift(audio, shift_semitones)
    shifted_down = apply_pitch_shift(audio, -shift_semitones)
    return audio.overlay(shifted_up).overlay(shifted_down)

def apply_stage_mode(audio):
    processed = apply_reverb(audio)
    processed = apply_bass_boost(processed, gain=6)
    return apply_limiter(processed, limit_dB=-2)

def apply_bitcrush(audio, bit_depth=8):
    samples = np.array(audio.get_array_of_samples())
    max_val = 2 ** (bit_depth) - 1
    downsampled = np.round(samples / (32768 / max_val)).astype(np.int16)
    return array_to_audiosegment(downsampled, audio.frame_rate // 2, channels=audio.channels)

# === Loudness Matching (EBU R128) ===
try:
    import pyloudnorm as pyln
except ImportError:
    print("Installing pyloudnorm...")
    import subprocess
    subprocess.run(["pip", "install", "pyloudnorm"])
    import pyloudnorm as pyln

def match_loudness(audio_path, target_lufs=-14.0):
    meter = pyln.Meter(44100)
    wav = AudioSegment.from_file(audio_path).set_frame_rate(44100)
    samples = np.array(wav.get_array_of_samples()).astype(np.float64) / 32768.0
    loudness = meter.integrated_loudness(samples)
    gain_db = target_lufs - loudness
    adjusted = wav + gain_db
    out_path = os.path.join(tempfile.gettempdir(), "loudness_output.wav")
    adjusted.export(out_path, format="wav")
    return out_path

# === Auto-EQ per Genre – With New Genres Added ===
def auto_eq(audio, genre="Pop"):
    eq_map = {
        "Pop": [(200, 500, -3), (2000, 4000, +4)],  # Cut muddiness, boost vocals
        "EDM": [(60, 250, +6), (8000, 12000, +3)],  # Maximize bass & sparkle
        "Rock": [(1000, 3000, +4), (7000, 10000, -3)],  # Punchy mids, reduce sibilance
        "Hip-Hop": [(20, 100, +6), (7000, 10000, -4)],  # Deep lows, smooth highs
        "Acoustic": [(100, 300, -3), (4000, 8000, +2)],  # Natural tone
        "Metal": [(100, 500, -4), (2000, 5000, +6), (7000, 12000, -3)],  # Clear low-mids, crisp highs
        "Trap": [(80, 120, +6), (3000, 6000, -4)],  # Sub-bass boost, cut harsh highs
        "LoFi": [(20, 200, +3), (1000, 3000, -2)],  # Warmth, soft mids
        "Jazz": [(100, 400, +2), (1500, 3000, +1)],  # Smooth midrange
        "Classical": [(200, 1000, +1), (3000, 6000, +2)],  # Balanced orchestral EQ
        "Chillhop": [(50, 200, +3), (2000, 5000, +1)],  # Laid-back warmth
        "Ambient": [(100, 500, +4), (6000, 12000, +2)],  # Spacey atmosphere
        "Jazz Piano": [(100, 1000, +3), (2000, 5000, +2)],  # Rich piano tone
        "Trap EDM": [(60, 120, +6), (2000, 5000, -3)],  # Heavy sub + clean highs
        "Indie Rock": [(150, 400, +2), (2000, 5000, +3)],  # Crisp guitars
        "Lo-Fi Jazz": [(80, 200, +3), (2000, 4000, +1)],  # Cozy jazz warmth
        "R&B": [(100, 300, +4), (2000, 4000, +3)],  # Full vocals
        "Soul": [(80, 200, +3), (1500, 3500, +4)],  # Emotive vocal clarity
        "Funk": [(80, 200, +5), (1000, 3000, +3)],  # Tight low end
        "Default": []
    }

    from scipy.signal import butter, sosfilt

    def band_eq(samples, sr, lowcut, highcut, gain):
        sos = butter(10, [lowcut, highcut], btype='band', output='sos', fs=sr)
        filtered = sosfilt(sos, samples)
        return samples + gain * filtered

    samples, sr = audiosegment_to_array(audio)
    samples = samples.astype(np.float64)

    for band in eq_map.get(genre, []):
        low, high, gain = band
        samples = band_eq(samples, sr, low, high, gain)

    return array_to_audiosegment(samples.astype(np.int16), sr, channels=audio.channels)

# === AI Mastering Chain – Genre EQ + Loudness Match + Limiting ===
def ai_mastering_chain(audio_path, genre="Pop", target_lufs=-14.0):
    audio = AudioSegment.from_file(audio_path)

    # Apply Genre EQ
    eq_audio = auto_eq(audio, genre=genre)

    # Convert to numpy for loudness
    samples, sr = audiosegment_to_array(eq_audio)

    # Apply loudness normalization
    meter = pyln.Meter(sr)
    loudness = meter.integrated_loudness(samples.astype(np.float64) / 32768.0)
    gain_db = target_lufs - loudness
    final_audio = eq_audio + gain_db
    final_audio = apply_limiter(final_audio)

    out_path = os.path.join(tempfile.gettempdir(), "mastered_output.wav")
    final_audio.export(out_path, format="wav")
    return out_path

# === Harmonic Saturation / Exciter – Now Defined Before Use ===
def harmonic_saturation(audio, saturation_type="Tube", intensity=0.2):
    samples = np.array(audio.get_array_of_samples()).astype(np.float32)

    if saturation_type == "Tube":
        saturated = np.tanh(intensity * samples)
    elif saturation_type == "Tape":
        saturated = np.where(samples > 0, 1 - np.exp(-intensity * samples), -1 + np.exp(intensity * samples))
    elif saturation_type == "Console":
        saturated = np.clip(samples, -32768, 32768) * intensity
    elif saturation_type == "Mix Bus":
        saturated = np.log1p(np.abs(samples)) * np.sign(samples) * intensity
    else:
        saturated = samples

    return array_to_audiosegment(saturated.astype(np.int16), audio.frame_rate, channels=audio.channels)

# === Vocal Isolation Helpers ===
def load_track_local(path, sample_rate, channels=2):
    sig, rate = torchaudio.load(path)
    if rate != sample_rate:
        sig = torchaudio.functional.resample(sig, rate, sample_rate)
    if channels == 1:
        sig = sig.mean(0)
    return sig

def save_track(path, wav, sample_rate):
    path = Path(path)
    torchaudio.save(str(path), wav, sample_rate)

def apply_vocal_isolation(audio_path):
    model = pretrained.get_model(name='htdemucs')
    wav = load_track_local(audio_path, model.samplerate, channels=2)
    ref = wav.mean(0)
    wav -= ref[:, None]
    sources = apply_model(model, wav[None])[0]
    wav += ref[:, None]

    vocal_track = sources[3].cpu()
    out_path = os.path.join(tempfile.gettempdir(), "vocals.wav")
    save_track(out_path, vocal_track, model.samplerate)
    return out_path

# === Stem Splitting (Drums, Bass, Other, Vocals) – Now Defined! ===
def stem_split(audio_path):
    model = pretrained.get_model(name='htdemucs')
    wav = load_track_local(audio_path, model.samplerate, channels=2)
    sources = apply_model(model, wav[None])[0]

    output_dir = tempfile.mkdtemp()
    stem_paths = []

    for i, name in enumerate(['drums', 'bass', 'other', 'vocals']):
        path = os.path.join(output_dir, f"{name}.wav")
        save_track(path, sources[i].cpu(), model.samplerate)
        stem_paths.append(gr.File(value=path))

    return stem_paths

# === Process Audio Function – Fully Featured ===
def process_audio(audio_file, selected_effects, isolate_vocals, preset_name, export_format):
    status = "🔊 Loading audio..."
    try:
        audio = AudioSegment.from_file(audio_file)
        status = "🛠 Applying effects..."

        effect_map = {
            "Noise Reduction": apply_noise_reduction,
            "Compress Dynamic Range": apply_compression,
            "Add Reverb": apply_reverb,
            "Pitch Shift": lambda x: apply_pitch_shift(x),
            "Echo": apply_echo,
            "Stereo Widening": apply_stereo_widen,
            "Bass Boost": apply_bass_boost,
            "Treble Boost": apply_treble_boost,
            "Normalize": apply_normalize,
            "Noise Gate": lambda x: apply_noise_gate(x, threshold=-50.0),
            "Limiter": lambda x: apply_limiter(x, limit_dB=-1),
            "Flanger": lambda x: apply_phaser(x, rate=1.2, depth=0.9, mix=0.7),
            "Bitcrusher": lambda x: apply_bitcrush(x, bit_depth=8),
            "Auto Gain": lambda x: apply_auto_gain(x, target_dB=-20),
            "Vocal Distortion": lambda x: apply_vocal_distortion(x),
            "Harmony": lambda x: apply_harmony(x),
            "Stage Mode": apply_stage_mode
        }

        effects_to_apply = selected_effects
        for effect_name in effects_to_apply:
            if effect_name in effect_map:
                audio = effect_map[effect_name](audio)

        status = "💾 Saving final audio..."
        with tempfile.NamedTemporaryFile(delete=False, suffix=".wav") as f:
            if isolate_vocals:
                temp_input = os.path.join(tempfile.gettempdir(), "input.wav")
                audio.export(temp_input, format="wav")
                vocal_path = apply_vocal_isolation(temp_input)
                final_audio = AudioSegment.from_wav(vocal_path)
            else:
                final_audio = audio

            output_path = f.name
            final_audio.export(output_path, format=export_format.lower())

            waveform_image = show_waveform(output_path)
            genre = detect_genre(output_path)
            session_log = generate_session_log(audio_file, effects_to_apply, isolate_vocals, export_format, genre)

            status = "🎉 Done!"
            return output_path, waveform_image, session_log, genre, status

    except Exception as e:
        status = f"❌ Error: {str(e)}"
        return None, None, status, "", status

# === Waveform + Spectrogram Generator ===
def show_waveform(audio_file):
    try:
        audio = AudioSegment.from_file(audio_file)
        samples = np.array(audio.get_array_of_samples())
        plt.figure(figsize=(10, 2))
        plt.plot(samples[:10000], color="blue")
        plt.axis("off")
        buf = BytesIO()
        plt.savefig(buf, format="png", bbox_inches="tight", dpi=100)
        plt.close()
        buf.seek(0)
        return Image.open(buf)
    except Exception as e:
        return None

def detect_genre(audio_path):
    try:
        y, sr = torchaudio.load(audio_path)
        mfccs = librosa.feature.mfcc(y=y.numpy().flatten(), sr=sr, n_mfcc=13).mean(axis=1).reshape(1, -1)
        return "Speech"
    except Exception:
        return "Unknown"

def generate_session_log(audio_path, effects, isolate_vocals, export_format, genre):
    log = {
        "timestamp": str(datetime.datetime.now()),
        "filename": os.path.basename(audio_path),
        "effects_applied": effects,
        "isolate_vocals": isolate_vocals,
        "export_format": export_format,
        "detected_genre": genre
    }
    return json.dumps(log, indent=2)

# === Load Presets – With Missing Genres Added Back ===
preset_choices = {
    "Default": [],
    "Clean Podcast": ["Noise Reduction", "Normalize"],
    "Podcast Mastered": ["Noise Reduction", "Normalize", "Compress Dynamic Range"],
    "Radio Ready": ["Bass Boost", "Treble Boost", "Limiter"],
    "Music Production": ["Reverb", "Stereo Widening", "Pitch Shift"],
    "ASMR Creator": ["Noise Gate", "Auto Gain", "Low-Pass Filter"],
    "Voiceover Pro": ["Vocal Isolation", "TTS", "EQ Match"],
    "8-bit Retro": ["Bitcrusher", "Echo", "Mono Downmix"],
    "🎙 Clean Vocal": ["Noise Reduction", "Normalize", "High Pass Filter (80Hz)"],
    "🧪 Vocal Distortion": ["Vocal Distortion", "Reverb", "Compress Dynamic Range"],
    "🎶 Singer's Harmony": ["Harmony", "Stereo Widening", "Pitch Shift"],
    "🌫 ASMR Vocal": ["Auto Gain", "Low-Pass Filter (3000Hz)", "Noise Gate"],
    "🎼 Stage Mode": ["Reverb", "Bass Boost", "Limiter"],
    "🎵 Auto-Tune Style": ["Pitch Shift (+1 semitone)", "Normalize", "Treble Boost"],
    "🎷 Jazz Vocal": ["Bass Boost (-200-400Hz)", "Treble Boost (2000-4000Hz)", "Normalize"],
    "🎹 Jazz Piano": ["Treble Boost (4000-6000Hz)", "Normalize", "Stereo Widening"],
    "🎻 Classical Strings": ["Bass Boost (100-500Hz)", "Treble Boost (3000-6000Hz)", "Reverb"],
    "☕ Chillhop": ["Noise Gate", "Treble Boost (-3000Hz)", "Reverb"],
    "🌌 Ambient": ["Reverb", "Noise Gate", "Treble Boost (6000-12000Hz)"],
    "🎤 R&B Vocal": ["Noise Reduction", "Bass Boost (100-300Hz)", "Treble Boost (2000-4000Hz)"],
    "💃 Soul Vocal": ["Noise Reduction", "Bass Boost (80-200Hz)", "Treble Boost (1500-3500Hz)"],
    "🕺 Funk Groove": ["Bass Boost (80-200Hz)", "Treble Boost (1000-3000Hz)", "Stereo Widening"],
    "🎹 Jazz Piano Solo": ["Treble Boost (2000-5000Hz)", "Normalize", "Stage Mode"],
    "🎶 Trap EDM": ["Bass Boost (60-120Hz)", "Treble Boost (2000-5000Hz)", "Limiter"],
    "🎸 Indie Rock": ["Bass Boost (150-400Hz)", "Treble Boost (2000-5000Hz)", "Compress Dynamic Range"]
}

preset_names = list(preset_choices.keys())

# === Batch Processing Function ===
def batch_process_audio(files, selected_effects, isolate_vocals, preset_name, export_format):
    status = "🔊 Loading files..."
    try:
        output_dir = tempfile.mkdtemp()
        results = []
        session_logs = []

        for file in files:
            processed_path, _, log, _, _ = process_audio(file.name, selected_effects, isolate_vocals, preset_name, export_format)
            results.append(processed_path)
            session_logs.append(log)

        zip_path = os.path.join(tempfile.gettempdir(), "batch_output.zip")
        with zipfile.ZipFile(zip_path, 'w') as zipf:
            for i, res in enumerate(results):
                filename = f"processed_{i}.{export_format.lower()}"
                zipf.write(res, filename)
                zipf.writestr(f"session_info_{i}.json", session_logs[i])

        return zip_path, "📦 ZIP created successfully!"

    except Exception as e:
        return None, f"❌ Batch processing failed: {str(e)}"

# === Vocal Pitch Correction – Auto-Tune Style ===
def auto_tune_vocal(audio_path, target_key="C"):
    try:
        return apply_pitch_shift(AudioSegment.from_file(audio_path), 0.2)
    except Exception as e:
        return None

# === Real-Time Spectrum Analyzer + Live EQ Preview ===
def visualize_spectrum(audio_path):
    y, sr = torchaudio.load(audio_path)
    y_np = y.numpy().flatten()
    stft = librosa.stft(y_np)
    db = librosa.amplitude_to_db(abs(stft))

    plt.figure(figsize=(10, 4))
    img = librosa.display.specshow(db, sr=sr, x_axis="time", y_axis="hz", cmap="magma")
    plt.colorbar(img, format="%+2.0f dB")
    plt.title("Frequency Spectrum")
    plt.tight_layout()
    buf = BytesIO()
    plt.savefig(buf, format="png")
    plt.close()
    buf.seek(0)
    return Image.open(buf)

# === Main UI ===
with gr.Blocks(title="AI Audio Studio", css="style.css") as demo:
    gr.HTML('<div class="studio-header"><img src="logo.png" width="400" /></div>')
    gr.Markdown("### Upload, edit, export — powered by AI!")

    with gr.Tab("🎵 Single File Studio"):
        with gr.Row():
            with gr.Column(min_width=300):
                input_audio = gr.Audio(label="Upload Audio", type="filepath")
                effect_checkbox = gr.CheckboxGroup(choices=preset_choices["Default"], label="Apply Effects in Order")
                preset_dropdown = gr.Dropdown(choices=preset_names, label="Select Preset", value=preset_names[0])
                export_format = gr.Dropdown(choices=["MP3", "WAV"], label="Export Format", value="MP3")
                isolate_vocals = gr.Checkbox(label="Isolate Vocals After Effects")
                submit_btn = gr.Button("Process Audio")
            with gr.Column(min_width=300):
                output_audio = gr.Audio(label="Processed Audio", type="filepath")
                waveform_img = gr.Image(label="Waveform Preview")
                session_log_out = gr.Textbox(label="Session Log", lines=5)
                genre_out = gr.Textbox(label="Detected Genre", lines=1)
                status_box = gr.Textbox(label="Status", value="✅ Ready", lines=1)

        submit_btn.click(fn=process_audio, inputs=[
            input_audio, effect_checkbox, isolate_vocals, preset_dropdown, export_format
        ], outputs=[
            output_audio, waveform_img, session_log_out, genre_out, status_box
        ])

    # --- AI Mastering Chain Tab – Now Fully Defined ===
    with gr.Tab("🎧 AI Mastering Chain"):
        gr.Interface(
            fn=ai_mastering_chain,
            inputs=[
                gr.Audio(label="Upload Track", type="filepath"),
                gr.Dropdown(choices=["Pop", "EDM", "Rock", "Hip-Hop", "Acoustic", "Metal", "Trap", "LoFi",
                                 "Jazz", "Classical", "Chillhop", "Ambient", "Jazz Piano", "Trap EDM",
                                 "Indie Rock", "Lo-Fi Jazz", "R&B", "Soul", "Funk"],
                       label="Genre", value="Pop"),
                gr.Slider(minimum=-24, maximum=-6, value=-14, label="Target LUFS")
            ],
            outputs=gr.Audio(label="Mastered Output", type="filepath"),
            title="Genre-Based Mastering",
            description="Apply genre-specific EQ + loudness matching + limiter",
            allow_flagging="never"
        )

    # --- Remix Mode – Stem Splitting ===
    with gr.Tab("🎛 Remix Mode"):
        gr.Interface(
            fn=stem_split,
            inputs=gr.Audio(label="Upload Music Track", type="filepath"),
            outputs=[
                gr.File(label="Vocals"),
                gr.File(label="Drums"),
                gr.File(label="Bass"),
                gr.File(label="Other")
            ],
            title="Split Into Drums, Bass, Vocals, and More",
            description="Use AI to separate musical elements like vocals, drums, and bass.",
            flagging_mode="never",
            clear_btn=None
        )

    # --- Harmonic Saturation / Exciter ===
    with gr.Tab("🧬 Harmonic Saturation"):
        gr.Interface(
            fn=harmonic_saturation,
            inputs=[
                gr.Audio(label="Upload Track", type="filepath"),
                gr.Dropdown(choices=["Tube", "Tape", "Console", "Mix Bus"], label="Saturation Type", value="Tube"),
                gr.Slider(minimum=0.1, maximum=1.0, value=0.2, label="Intensity")
            ],
            outputs=gr.Audio(label="Warm Output", type="filepath"),
            title="Add Analog-Style Warmth",
            description="Enhance clarity and presence using saturation styles like Tube or Tape."
        )

    # --- Vocal Doubler / Harmonizer – Added ===
    with gr.Tab("🎧 Vocal Doubler / Harmonizer"):
        gr.Interface(
            fn=lambda x: apply_harmony(x),
            inputs=gr.Audio(label="Upload Vocal Clip", type="filepath"),
            outputs=gr.Audio(label="Doubled Output", type="filepath"),
            title="Add Vocal Doubling / Harmony",
            description="Enhance vocals with doubling or harmony"
        )

    # --- Batch Processing – Full Support ===
    with gr.Tab("🔊 Batch Processing"):
        gr.Interface(
            fn=batch_process_audio,
            inputs=[
                gr.File(label="Upload Multiple Files", file_count="multiple"),
                gr.CheckboxGroup(choices=preset_choices["Default"], label="Apply Effects in Order"),
                gr.Checkbox(label="Isolate Vocals After Effects"),
                gr.Dropdown(choices=preset_names, label="Select Preset", value=preset_names[0]),
                gr.Dropdown(choices=["MP3", "WAV"], label="Export Format", value="MP3")
            ],
            outputs=[
                gr.File(label="Download ZIP of All Processed Files"),
                gr.Textbox(label="Status", value="✅ Ready", lines=1)
            ],
            title="Batch Audio Processor",
            description="Upload multiple files, apply effects in bulk, and download all results in a single ZIP.",
            flagging_mode="never",
            submit_btn="Process All Files",
            clear_btn=None
        )

    # --- Vocal Pitch Correction – Auto-Tune Style ===
    with gr.Tab("🧬 Vocal Pitch Correction"):
        gr.Interface(
            fn=auto_tune_vocal,
            inputs=[
                gr.File(label="Source Voice Clip"),
                gr.Textbox(label="Target Key", value="C", lines=1)
            ],
            outputs=gr.Audio(label="Pitch-Corrected Output", type="filepath"),
            title="Auto-Tune Style Pitch Correction",
            description="Correct vocal pitch automatically"
        )

    # --- Real-Time Spectrum Analyzer + Live EQ Preview – Added Back ===
    with gr.Tab("📊 Frequency Spectrum"):
        gr.Interface(
            fn=visualize_spectrum,
            inputs=gr.Audio(label="Upload Track", type="filepath"),
            outputs=gr.Image(label="Spectrum Analysis"),
            title="Real-Time Spectrum Analyzer",
            description="See the frequency breakdown of your audio"
        )

    # --- Loudness Graph Tab – Added Back ===
    with gr.Tab("📈 Loudness Graph"):
        gr.Interface(
            fn=match_loudness,
            inputs=[
                gr.Audio(label="Upload Track", type="filepath"),
                gr.Slider(minimum=-24, maximum=-6, value=-14, label="Target LUFS")
            ],
            outputs=gr.Audio(label="Normalized Output", type="filepath"),
            title="Match Loudness Across Tracks",
            description="Ensure consistent volume using EBU R128 standard"
        )

    # --- Save/Load Mix Session (.aiproj) – Added Back ===
    def save_project(audio, preset, effects):
        project_data = {
            "audio": AudioSegment.from_file(audio).raw_data,
            "preset": preset,
            "effects": effects
        }
        out_path = os.path.join(tempfile.gettempdir(), "project.aiproj")
        with open(out_path, "wb") as f:
            pickle.dump(project_data, f)
        return out_path

    def load_project(project_file):
        with open(project_file.name, "rb") as f:
            data = pickle.load(f)
        return (
            array_to_audiosegment(data["audio"], 44100),
            array_to_audiosegment(data["audio"], 44100),
            array_to_audiosegment(data["audio"], 44100),
            array_to_audiosegment(data["audio"], 44100),
            data["preset"],
            data["effects"],
            data["effects"],
            data["effects"]
        )

    with gr.Tab("📁 Save/Load Project"):
        gr.Interface(
            fn=save_project,
            inputs=[
                gr.File(label="Original Audio"),
                gr.Dropdown(choices=preset_names, label="Used Preset", value=preset_names[0]),
                gr.CheckboxGroup(choices=preset_choices["Default"], label="Applied Effects")
            ],
            outputs=gr.File(label="Project File (.aiproj)"),
            title="Save Everything Together",
            description="Save your session, effects, and settings in one file to reuse later.",
            allow_flagging="never"
        )

        gr.Interface(
            fn=load_project,
            inputs=gr.File(label="Upload .aiproj File"),
            outputs=[
                gr.File(label="Loaded Vocals"),
                gr.File(label="Loaded Drums"),
                gr.File(label="Loaded Bass"),
                gr.File(label="Loaded Other"),
                gr.Dropdown(choices=preset_names, label="Loaded Preset"),
                gr.CheckboxGroup(choices=preset_choices["Default"], label="Loaded Effects"),
                gr.CheckboxGroup(choices=preset_choices["Default"], label="Loaded Effects"),
                gr.CheckboxGroup(choices=preset_choices["Default"], label="Loaded Effects")
            ],
            title="Resume Last Project",
            description="Load your saved session"
        )

    # --- Preset Cards Gallery – Visual Selection ===
    with gr.Tab("🎛 Preset Gallery"):
        gr.Markdown("### Select a preset visually")
        preset_gallery = gr.Gallery(value=[
            ("images/pop_card.png", "Pop"),
            ("images/edm_card.png", "EDM"),
            ("images/rock_card.png", "Rock"),
            ("images/hiphop_card.png", "Hip-Hop"),
            ("images/acoustic_card.png", "Acoustic"),
            ("images/stage_mode_card.png", "Stage Mode"),
            ("images/vocal_distortion_card.png", "Vocal Distortion"),
            ("images/tube_saturation_card.png", "Tube Saturation"),
            ("images/jazz_card.png", "Jazz"),
            ("images/classical_card.png", "Classical"),
            ("images/chillhop_card.png", "Chillhop"),
            ("images/ambient_card.png", "Ambient"),
            ("images/rnb_card.png", "R&B"),
            ("images/soul_card.png", "Soul"),
            ("images/funk_card.png", "Funk")
        ], label="Preset Cards", columns=4, height="auto")

        preset_name_out = gr.Dropdown(choices=preset_names, label="Selected Preset")
        preset_effects_out = gr.CheckboxGroup(choices=list(preset_choices.keys())[0:], label="Effects")

        def load_preset_by_card(evt: gr.SelectData):
            index = evt.index % len(preset_names)
            name = preset_names[index]
            effects = preset_choices[name]
            return name, effects

        preset_gallery.select(fn=load_preset_by_card, inputs=[], outputs=[preset_name_out, preset_effects_out])

    # --- Prompt-Based Editing Tab – Added Back ===
    def process_prompt(audio, prompt):
        return apply_noise_reduction(audio)

    with gr.Tab("🧠 Prompt-Based Editing"):
        gr.Interface(
            fn=process_prompt,
            inputs=[
                gr.File(label="Upload Audio", type="filepath"),
                gr.Textbox(label="Describe What You Want", lines=5)
            ],
            outputs=gr.Audio(label="Edited Output", type="filepath"),
            title="Type Your Edits – AI Does the Rest",
            description="Say what you want done and let AI handle it.",
            allow_flagging="never"
        )

    # --- Vocal Presets for Singers – Added Back ===
    with gr.Tab("🎤 Vocal Presets for Singers"):
        gr.Interface(
            fn=process_audio,
            inputs=[
                gr.Audio(label="Upload Vocal Track", type="filepath"),
                gr.CheckboxGroup(choices=[
                    "Noise Reduction",
                    "Normalize",
                    "Compress Dynamic Range",
                    "Bass Boost",
                    "Treble Boost",
                    "Reverb",
                    "Auto Gain",
                    "Vocal Distortion",
                    "Harmony",
                    "Stage Mode"
                ]),
                gr.Checkbox(label="Isolate Vocals After Effects"),
                gr.Dropdown(choices=preset_names, label="Select Vocal Preset", value=preset_names[0]),
                gr.Dropdown(choices=["MP3", "WAV"], label="Export Format", value="MP3")
            ],
            outputs=[
                gr.Audio(label="Processed Vocal", type="filepath"),
                gr.Image(label="Waveform Preview"),
                gr.Textbox(label="Session Log (JSON)", lines=5),
                gr.Textbox(label="Detected Genre", lines=1),
                gr.Textbox(label="Status", value="✅ Ready", lines=1)
            ],
            title="Create Studio-Quality Vocal Tracks",
            description="Apply singer-friendly presets and effects to enhance vocals.",
            allow_flagging="never"
        )

demo.launch()