"""
Rebuild the PageIndex (document_trees) for an already-ingested PDF.

Why this exists:
- Ingestion deletes the uploaded temp PDF after processing.
- PageIndex behavior evolves (better TOC handling, page_numbers, etc.).
- You may want to refresh only the structural index without re-embedding/re-uploading chunks.

Usage (PowerShell):
  conda activate rag_env
  python scripts/rebuild_pageindex.py --pdf "C:\path\to\file.pdf" --access-token "<JWT>"

Notes:
- This only rewrites `document_trees` (and optionally `identity_json` if you choose to extend it).
- It does NOT touch the vector store, RAPTOR summaries, or ingested_files registry.
"""

from __future__ import annotations

import argparse
import os
import sys
from pathlib import Path

# Ensure repo root is on sys.path so `import backend...` works when executed as a script.
REPO_ROOT = Path(__file__).resolve().parents[1]
if str(REPO_ROOT) not in sys.path:
    sys.path.insert(0, str(REPO_ROOT))

from backend.core.pipeline import (
    _build_document_tree,
    _build_service_supabase_client,
    get_file_fingerprint,
    partition_document,
)
from backend.core.auth_utils import extract_jwt_sub


def main() -> int:
    parser = argparse.ArgumentParser(description="Rebuild PageIndex tree for a PDF.")
    parser.add_argument("--pdf", required=True, help="Path to local PDF file.")
    parser.add_argument(
        "--access-token",
        required=False,
        default=None,
        help="User JWT (same X-Auth-Token used by the API). Optional if --user-id is provided.",
    )
    parser.add_argument(
        "--user-id",
        required=False,
        default=None,
        help="Supabase auth user_id (sub). Use this if you don't want to paste a JWT.",
    )
    args = parser.parse_args()

    pdf_path = os.path.abspath(args.pdf)
    if not os.path.exists(pdf_path):
        raise SystemExit(f"PDF not found: {pdf_path}")

    if args.user_id:
        user_id = str(args.user_id).strip()
    elif args.access_token:
        user_id = extract_jwt_sub(args.access_token)
    else:
        raise SystemExit("Provide either --user-id or --access-token.")
    file_hash = get_file_fingerprint(pdf_path)

    elements = partition_document(pdf_path)
    doc_tree = _build_document_tree(elements)

    sb = _build_service_supabase_client()
    sb.table("document_trees").upsert(
        {"file_hash": file_hash, "user_id": user_id, "tree_json": doc_tree},
        on_conflict="user_id,file_hash",
    ).execute()

    print(f"Rebuilt PageIndex tree for file_hash={file_hash} user_id={user_id}")
    return 0


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