"""
Utility helpers for the improved AICoverGen.
"""

import os
import re
from typing import Any, Dict


def format_time(seconds: float) -> str:
    """Format seconds as M:SS or H:MM:SS."""
    if seconds is None or seconds < 0:
        return "0:00"
    seconds = int(seconds)
    hours = seconds // 3600
    minutes = (seconds % 3600) // 60
    secs = seconds % 60
    if hours > 0:
        return f"{hours}:{minutes:02d}:{secs:02d}"
    return f"{minutes}:{secs:02d}"


def get_audio_info(path: str) -> Dict[str, Any]:
    """Return basic info about an audio file (duration, sample rate, channels)."""
    info: Dict[str, Any] = {
        "path": path,
        "exists": False,
        "duration": 0.0,
        "sample_rate": 0,
        "channels": 0,
        "size_bytes": 0,
    }
    if not path or not os.path.exists(path):
        return info
    info["exists"] = True
    info["size_bytes"] = os.path.getsize(path)
    try:
        import soundfile as sf
        with sf.SoundFile(path) as f:
            info["duration"] = len(f) / f.samplerate
            info["sample_rate"] = f.samplerate
            info["channels"] = f.channels
    except Exception:
        try:
            import librosa
            y, sr = librosa.load(path, sr=None, mono=False)
            info["sample_rate"] = sr
            if y.ndim > 1:
                info["channels"] = y.shape[0]
                info["duration"] = y.shape[1] / sr
            else:
                info["channels"] = 1
                info["duration"] = y.shape[0] / sr
        except Exception:
            pass
    return info


def human_size(num_bytes: int) -> str:
    """Convert bytes to human-readable string."""
    if num_bytes is None or num_bytes < 0:
        return "0 B"
    units = ["B", "KB", "MB", "GB", "TB"]
    size = float(num_bytes)
    idx = 0
    while size >= 1024 and idx < len(units) - 1:
        size /= 1024
        idx += 1
    return f"{size:.1f} {units[idx]}"