api.py

import gradio as gr
from gradio_client import Client
import os
import json
import random
from datetime import datetime
import numpy as np
from pydub import AudioSegment
import logging
import configparser

# Set up logging
logging.basicConfig(level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s")
logger = logging.getLogger(__name__)

# Configuration
BASE_DIR = "/home/pi5/muzax"
MP3_DIR = os.path.join(BASE_DIR, "mp3")
JSON_DIR = os.path.join(BASE_DIR, "json")
JSON_LOG = os.path.join(JSON_DIR, "render_log.json")
INI_FILE = os.path.join(BASE_DIR, "band_styles.ini")
API_URL = "http://192.168.0.155:9999/"
SONG_DURATION = 120  # API-compatible duration (integer)
TARGET_DURATION_MS = 180000  # 180 seconds in milliseconds

# Load band styles from INI
config = configparser.ConfigParser()
if not os.path.exists(INI_FILE):
    logger.error(f"INI file not found: {INI_FILE}")
    raise FileNotFoundError(f"INI file not found: {INI_FILE}")
config.read(INI_FILE)
ALLOWED_BANDS = config.sections()

# Create directories
for directory in [BASE_DIR, MP3_DIR, JSON_DIR]:
    if not os.path.exists(directory):
        os.makedirs(directory)
        logger.info(f"Created directory: {directory}")

# Initialize JSON log
if not os.path.exists(JSON_LOG):
    with open(JSON_LOG, "w") as f:
        json.dump([], f)
    logger.info(f"Initialized JSON log: {JSON_LOG}")

def generate_random_params(band):
    """Generate random parameters from INI file."""
    style = config[band]
    bpm = random.randint(int(style["bpm_min"]), int(style["bpm_max"]))
    drum_beat = random.choice(style["drum_beat"].split(","))
    synthesizer = random.choice(style["synthesizer"].split(","))
    rhythmic_steps = random.choice(style["rhythmic_steps"].split(","))
    bass_style = random.choice(style["bass_style"].split(","))
    guitar_style = random.choice(style["guitar_style"].split(","))
    return bpm, drum_beat, synthesizer, rhythmic_steps, bass_style, guitar_style

def generate_music_placeholder(prompt, duration, bpm, drum_beat, bass_style, guitar_style):
    """Placeholder for music generation."""
    sample_rate = 44100
    duration_ms = int(duration) * 1000
    audio = AudioSegment.silent(duration=duration_ms)
    t = np.linspace(0, float(duration), int(sample_rate * float(duration)), endpoint=False)
    freq = 440 if guitar_style == "clean" else 220
    sine_wave = 0.5 * np.sin(2 * np.pi * freq * t)
    audio_samples = (sine_wave * 32767).astype(np.int16)
    audio = AudioSegment(
        audio_samples.tobytes(),
        frame_rate=sample_rate,
        sample_width=2,
        channels=1
    )
    return audio

def extend_audio(audio, target_duration_ms):
    """Extend audio to target duration by looping."""
    current_duration = len(audio)
    if current_duration >= target_duration_ms:
        return audio[:target_duration_ms]  # Trim to exact duration
    # Loop audio to exceed target duration
    extended_audio = audio
    while len(extended_audio) < target_duration_ms:
        extended_audio += audio
    return extended_audio[:target_duration_ms]  # Trim to exact duration

def save_to_mp3(audio, filename):
    """Save audio to MP3."""
    filepath = os.path.join(MP3_DIR, filename)
    audio.export(filepath, format="mp3")
    logger.info(f"Saved MP3 to {filepath}")
    return filepath

def update_json_log(band, params, filepath, status):
    """Update JSON log."""
    with open(JSON_LOG, "r") as f:
        log = json.load(f)
    render_entry = {
        "timestamp": datetime.now().isoformat(),
        "band": band,
        "parameters": params,
        "filepath": filepath,
        "status": status
    }
    log.append(render_entry)
    with open(JSON_LOG, "w") as f:
        json.dump(log, f, indent=2)
    logger.info(f"Updated JSON log: {render_entry}")

def generate_song(band, bpm, drum_beat, synthesizer, rhythmic_steps, bass_style, guitar_style):
    """Generate and save a 180-second song."""
    try:
        client = Client(API_URL)
        params = {
            "bpm": bpm,
            "drum_beat": drum_beat,
            "synthesizer": synthesizer,
            "rhythmic_steps": rhythmic_steps,
            "bass_style": bass_style,
            "guitar_style": guitar_style,
            "api_name": config[band]["api_name"]
        }
        prompt = client.predict(**params)
        logger.info(f"Prompt for {band}: {prompt}")

        music_params = {
            "instrumental_prompt": prompt,
            "cfg_scale": 3.0,
            "top_k": 300,
            "top_p": 0.9,
            "temperature": 0.8,
            "total_duration": SONG_DURATION,
            "bpm": bpm,
            "drum_beat": drum_beat,
            "synthesizer": synthesizer,
            "rhythmic_steps": rhythmic_steps,
            "bass_style": bass_style,
            "guitar_style": guitar_style,
            "target_volume": -23.0,
            "preset": "rock",
            "vram_status": "",
            "api_name": "/generate_music"
        }

        result = client.predict(**music_params)
        filepath, status, _ = result

        if not filepath:
            logger.warning("API returned no audio, using placeholder.")
            audio = generate_music_placeholder(
                prompt, SONG_DURATION, bpm, drum_beat, bass_style, guitar_style
            )
            audio = extend_audio(audio, TARGET_DURATION_MS)
            timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
            filename = f"{band}_{timestamp}.mp3"
            filepath = save_to_mp3(audio, filename)
            status = "Generated with placeholder, extended to 180 seconds"
        else:
            # Load API-generated audio and extend
            audio = AudioSegment.from_file(filepath)
            audio = extend_audio(audio, TARGET_DURATION_MS)
            timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
            filename = f"{band}_{timestamp}.mp3"
            filepath = save_to_mp3(audio, filename)
            status = "Generated with API, extended to 180 seconds"

        update_json_log(band, music_params, filepath, status)
        return filepath, status

    except Exception as e:
        logger.error(f"Error generating song: {str(e)}")
        return None, f"Error: {str(e)}"

def get_last_five_songs():
    """Get the last 5 songs from JSON log."""
    try:
        with open(JSON_LOG, "r") as f:
            log = json.load(f)
        log.sort(key=lambda x: x["timestamp"], reverse=True)
        return [
            {
                "timestamp": entry["timestamp"],
                "band": entry["band"].replace("_", " ").title(),
                "filepath": entry["filepath"],
                "parameters": entry["parameters"],
                "status": entry["status"]
            }
            for entry in log[:5]
        ]
    except Exception as e:
        logger.error(f"Error reading JSON log: {str(e)}")
        return []

def create_gradio_interface():
    """Create Gradio interface."""
    css = """
    .gradio-container {background-color: #2b2b2b; color: #ffffff; font-family: Arial, sans-serif;}
    .gr-button-primary {background-color: #4a90e2; color: #ffffff; border: none; padding: 10px 20px; border-radius: 5px;}
    .gr-button-primary:hover {background-color: #357abd;}
    .gr-button-secondary {background-color: #4a4a4a; color: #ffffff; border: none; padding: 10px 20px; border-radius: 5px;}
    .gr-button-secondary:hover {background-color: #333333;}
    .gr-panel {background-color: #3c3c3c; border: none; border-radius: 8px; padding: 15px;}
    .gr-textbox, .gr-slider, .gr-dropdown, .gr-audio {background-color: #4a4a4a; color: #ffffff; border: none; border-radius: 5px;}
    .gr-markdown h1, .gr-markdown h2, .gr-markdown h3 {color: #ffffff;}
    """
    with gr.Blocks(title="Muzax Rock Generator", css=css) as demo:
        gr.Markdown(
            """
            # Muzax Rock Song Generator
            Create 3-minute rock songs inspired by top bands. Save MP3s to /home/pi5/muzax/mp3.
            """
        )

        with gr.Tabs():
            for band in ALLOWED_BANDS:
                with gr.Tab(label=band.replace("_", " ").title()):
                    gr.Markdown(f"### {band.replace('_', ' ').title()} Song Generator")
                    with gr.Column():
                        bpm = gr.Slider(
                            minimum=60,
                            maximum=180,
                            value=120,
                            step=1,
                            label="Tempo (BPM) 🎵",
                            info="Song speed in beats per minute."
                        )
                        drum_beat = gr.Dropdown(
                            choices=["none", "standard rock", "funk groove", "techno kick", "jazz swing"],
                            value="standard rock",
                            label="Drum Beat 🥁",
                            info="Drum style."
                        )
                        synthesizer = gr.Dropdown(
                            choices=["none", "analog synth", "digital pad", "arpeggiated synth"],
                            value="none",
                            label="Synthesizer 🎹",
                            info="Synth sound."
                        )
                        rhythmic_steps = gr.Dropdown(
                            choices=["none", "syncopated steps", "steady steps", "complex steps"],
                            value="steady steps",
                            label="Rhythmic Steps 👣",
                            info="Rhythm complexity."
                        )
                        bass_style = gr.Dropdown(
                            choices=["none", "slap bass", "deep bass", "melodic bass"],
                            value="deep bass",
                            label="Bass Style 🎸",
                            info="Bass guitar style."
                        )
                        guitar_style = gr.Dropdown(
                            choices=["none", "distorted", "clean", "jangle"],
                            value="distorted",
                            label="Guitar Style 🎸",
                            info="Guitar sound."
                        )

                        with gr.Row():
                            randomize_btn = gr.Button("Randomize", variant="secondary")
                            generate_btn = gr.Button("Generate Song", variant="primary")

                        audio_output = gr.Audio(
                            label="Generated Song 🎵",
                            type="filepath",
                            interactive=False
                        )
                        status_output = gr.Textbox(
                            label="Status 📢",
                            placeholder="Status updates here.",
                            interactive=False
                        )

                    randomize_btn.click(
                        fn=lambda: generate_random_params(band),
                        outputs=[bpm, drum_beat, synthesizer, rhythmic_steps, bass_style, guitar_style]
                    )

                    generate_btn.click(
                        fn=generate_song,
                        inputs=[gr.State(value=band), bpm, drum_beat, synthesizer, rhythmic_steps, bass_style, guitar_style],
                        outputs=[audio_output, status_output]
                    )

            with gr.Tab("Recent Songs"):
                gr.Markdown("### Last 5 Songs")
                recent_songs = gr.State(value=get_last_five_songs())

                for i in range(5):
                    with gr.Group():
                        gr.Markdown(f"#### Song {i+1}")
                        audio_player = gr.Audio(label=f"Song {i+1}", type="filepath", interactive=False)
                        info_text = gr.Textbox(label=f"Details {i+1}", interactive=False)
                        play_btn = gr.Button(f"Play Song {i+1}", variant="primary")

                        def play_song(song_list, index=i):
                            if index < len(song_list) and os.path.exists(song_list[index]["filepath"]):
                                return (
                                    song_list[index]["filepath"],
                                    f"Band: {song_list[index]['band']}\nTime: {song_list[index]['timestamp']}\nParams: {json.dumps(song_list[index]['parameters'], indent=2)}\nStatus: {song_list[index]['status']}"
                                )
                            return None, "Song unavailable."

                        play_btn.click(
                            fn=play_song,
                            inputs=[recent_songs],
                            outputs=[audio_player, info_text]
                        )

                refresh_btn = gr.Button("Refresh Songs", variant="secondary")
                refresh_btn.click(
                    fn=get_last_five_songs,
                    outputs=[recent_songs]
                )

            with gr.Tab("Render Log"):
                gr.Markdown("### Render Log")
                log_output = gr.JSON(label="All Renders", value=lambda: json.load(open(JSON_LOG)))
                refresh_log_btn = gr.Button("Refresh Log", variant="primary")
                refresh_log_btn.click(
                    fn=lambda: json.load(open(JSON_LOG)),
                    outputs=[log_output]
                )

    return demo

if __name__ == "__main__":
    try:
        demo = create_gradio_interface()
        demo.launch(server_name="0.0.0.0", server_port=3223, share=True)
        logger.info("Gradio launched on 0.0.0.0:3223 with public sharing enabled")
    except Exception as e:
        logger.error(f"Failed to launch Gradio: {str(e)}")