"""
pipeline/packager.py
Bundles all reel files + a metadata.json into a timestamped ZIP.
"""

import json
import zipfile
from datetime import datetime
from pathlib import Path
from typing import List

from utils import ReelOutput, log


def package_reels(reel_outputs: List[ReelOutput], output_dir: Path) -> Path:
    """
    Create a ZIP archive containing all reel MP4s + metadata.json.

    Returns the Path to the .zip file.
    """
    timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
    zip_path  = output_dir / f"StudioX_Reels_{timestamp}.zip"

    metadata = {
        "generated_at": datetime.now().isoformat(),
        "total_reels" : len(reel_outputs),
        "reels"       : [r.to_dict() for r in reel_outputs],
    }

    with zipfile.ZipFile(zip_path, "w", zipfile.ZIP_DEFLATED) as zf:
        for reel in reel_outputs:
            zf.write(reel.path, reel.filename)
        zf.writestr("metadata.json", json.dumps(metadata, indent=2))

    zip_size_mb = zip_path.stat().st_size / 1_048_576
    log("📦", f"ZIP ready: {zip_path.name} ({zip_size_mb:.1f} MB) "
              f"— {len(reel_outputs)} reels")
    return zip_path