#!/usr/bin/env python3
"""CLI: build a single FLP from a JSON song definition.

Usage:
    python scripts/build_from_json.py <song.json> [--out <output.flp>]
"""
import argparse
import sys
from pathlib import Path

# Add project root to path
sys.path.insert(0, str(Path(__file__).parents[1]))

from src.flp_builder.schema import load_song_json
from src.flp_builder.builder import FLPBuilder


def main():
    parser = argparse.ArgumentParser(
        description="Build FLP from JSON song definition"
    )
    parser.add_argument("song_json", help="Path to song .json file")
    parser.add_argument(
        "--out", help="Output .flp path (default: same name as JSON)"
    )
    args = parser.parse_args()

    json_path = Path(args.song_json)
    out_path = (
        Path(args.out) if args.out else json_path.with_suffix(".flp")
    )

    song = load_song_json(json_path)
    builder = FLPBuilder()
    flp = builder.build(song)

    out_path.write_bytes(flp)
    print(f"Built {out_path} ({len(flp):,} bytes)")


if __name__ == "__main__":
    main()