#!/usr/bin/env python3
"""
engine_lygo.py – LYGO Resonance Engine Module
Importable by app.py. Returns (log, audio_path, downloadable_files).
"""

import os
from pathlib import Path
from resonance_engine import ResonanceEngine, PRESETS
from utils import safe_sf_write, logger

def run_lygo_resonance(image_path, style, seed, duration, noise_filter, 
                       enable_ldq, genre_manifold, percussion_mode, perceptual_polish,
                       bpm, swing, export_stems, export_midi):
    """
    Run LYGO Resonance Engine with given parameters.
    Returns (log_message, audio_path, list_of_files).
    """
    if not image_path or not os.path.exists(image_path):
        return "❌ No valid image provided.", None, []

    # Build config
    config = {
        "duration": duration,
        "random_seed": int(seed) if seed != 0 else None,
        "verbose": False,
        "use_ldq": enable_ldq,
        "genre_manifold": genre_manifold,
        "percussion_mode": percussion_mode,
        "perceptual_polish": perceptual_polish,
        "tempo_bpm": bpm,
        "swing": swing,
        "export_stems": export_stems,
        "export_midi": export_midi,
    }
    if noise_filter > 0:
        config["noise_lowpass_hz"] = noise_filter

    preset = PRESETS.get(style, {})
    config.update(preset)

    # Initialize and run
    engine = ResonanceEngine(config)
    out_path = f"lygo_{Path(image_path).stem}.wav"
    
    try:
        engine.process(image_path, out_path)
    except Exception as e:
        logger.error(f"LYGO engine error: {e}", exc_info=True)
        return f"❌ LYGO Error: {str(e)}", None, []

    # Collect files
    downloadable = [out_path]
    if export_stems:
        base = out_path.replace(".wav", "")
        for suffix in ["noise", "drone", "melody", "glitch"]:
            stem_path = f"{base}_{suffix}.wav"
            if os.path.exists(stem_path):
                downloadable.append(stem_path)
    if export_midi:
        mid_path = out_path.replace(".wav", ".mid")
        if os.path.exists(mid_path):
            downloadable.append(mid_path)

    log_msg = (
        f"✅ LYGO Resonance Engine complete.\n"
        f"Output: {out_path}\n"
        f"LDQ enabled: {enable_ldq}\n"
        f"Genre: {genre_manifold}\n"
        f"Percussion: {percussion_mode}\n"
        f"BPM: {bpm}, Swing: {swing}"
    )
    return log_msg, out_path, downloadable