#!/usr/bin/env python3
"""Extract one LANTERN open-loop route by canonical ID."""

import argparse
import json
import tarfile
from pathlib import Path

parser = argparse.ArgumentParser()
parser.add_argument("canonical_id")
parser.add_argument("--root", type=Path, default=Path(__file__).resolve().parents[1])
parser.add_argument("--output", type=Path, required=True)
args = parser.parse_args()

manifest = args.root / "openloop" / "manifest.jsonl"
record = None
for line in manifest.read_text(encoding="utf-8").splitlines():
    candidate = json.loads(line)
    if candidate["canonical_id"] == args.canonical_id:
        record = candidate
        break
if record is None:
    raise SystemExit(f"Unknown canonical ID: {args.canonical_id}")

archive = args.root / record["archive"]
prefix = record["member_prefix"].rstrip("/") + "/"
args.output.mkdir(parents=True, exist_ok=True)
with tarfile.open(archive, "r") as stream:
    members = [member for member in stream.getmembers() if member.name == prefix[:-1] or member.name.startswith(prefix)]
    output_root = args.output.resolve()
    for member in members:
        target = (output_root / member.name).resolve()
        if output_root not in target.parents and target != output_root:
            raise SystemExit(f"Unsafe archive member: {member.name}")
    stream.extractall(args.output, members=members)
print(args.output / record["member_prefix"])