#!/usr/bin/env python3
"""Fail when a second GeoIntel source tree reappears below the repository root."""

from __future__ import annotations

import argparse
from pathlib import Path


CANONICAL_MARKERS = (
    "backend/app/main.py",
    "frontend/package.json",
    "docs/API_CONTRACTS.md",
)


def nested_mirror_markers(repo_root: Path) -> list[str]:
    nested = repo_root / "geointel"
    return [marker for marker in CANONICAL_MARKERS if (nested / marker).is_file()]


def main() -> int:
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument(
        "--repo-root",
        type=Path,
        default=Path(__file__).resolve().parents[1],
    )
    args = parser.parse_args()
    repo_root = args.repo_root.resolve()
    missing = [marker for marker in CANONICAL_MARKERS if not (repo_root / marker).is_file()]
    if missing:
        raise SystemExit(f"Canonical GeoIntel repository markers are missing: {missing}")
    duplicates = nested_mirror_markers(repo_root)
    if duplicates:
        raise SystemExit(
            "Nested GeoIntel repository mirror detected below geointel/: "
            f"{duplicates}. The repository root is the only canonical source tree."
        )
    print("Repository layout verified: one canonical GeoIntel source tree")
    return 0


if __name__ == "__main__":
    raise SystemExit(main())