"""Multimodal backfill — embed page images for existing case documents.

Iterates over documents already in the DB and renders + embeds + stores
per-page voyage-multimodal-3 vectors. Skips documents that already have
image embeddings (idempotent).

Independent of the processor pipeline — does NOT re-extract text or
re-chunk; only the multimodal step.

Designed to run from inside the FastAPI/MCP container (where /data is
mounted and writable). Locally it requires sudo for the thumbnails dir
under /home/chaim/legal-ai/data/cases/...

Usage::

    # In container (Coolify):
    docker exec -it <legal-ai-container> python -m legal_mcp.cli \\
        multimodal_backfill --cases 8174-24 8137-24

    # Or as a script (sets MULTIMODAL_ENABLED=true automatically):
    /opt/api/mcp-server/.venv/bin/python /opt/api/scripts/multimodal_backfill.py 8174-24 8137-24
"""
from __future__ import annotations

import argparse
import asyncio
import logging
import os
import sys
import time
from pathlib import Path
from uuid import UUID


def _setup_paths():
    """Ensure mcp-server src is on path even when run as a standalone script."""
    here = Path(__file__).resolve().parent
    mcp_src = here.parent / "mcp-server" / "src"
    if mcp_src.is_dir() and str(mcp_src) not in sys.path:
        sys.path.insert(0, str(mcp_src))


_setup_paths()
# Force the flag on for this run regardless of env — backfill is the
# whole point of running this script. The deploy-time default stays off.
os.environ["MULTIMODAL_ENABLED"] = "true"

from legal_mcp import config  # noqa: E402
from legal_mcp.services import db, embeddings, extractor, processor  # noqa: E402

logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s [%(levelname)s] %(message)s",
)
logger = logging.getLogger("multimodal_backfill")


def _resolve_local_path(db_path: str) -> Path:
    """Map container path /data/... to host /home/chaim/legal-ai/data/...
    when running locally; pass-through when already absolute and present."""
    p = Path(db_path)
    if p.is_file():
        return p
    if str(p).startswith("/data/"):
        local = Path("/home/chaim/legal-ai") / Path(*p.parts[1:])
        if local.is_file():
            return local
    return p


async def _backfill_document(
    document_id: UUID,
    case_id: UUID,
    title: str,
    db_file_path: str,
    skip_if_exists: bool,
) -> dict:
    pool = await db.get_pool()
    if skip_if_exists:
        existing = await pool.fetchval(
            "SELECT count(*) FROM document_image_embeddings WHERE document_id = $1",
            document_id,
        )
        if existing and existing > 0:
            logger.info("  skip (%d rows already): %s", existing, title)
            return {"status": "skipped", "rows": int(existing)}

    pdf_path = _resolve_local_path(db_file_path)
    if not pdf_path.is_file():
        logger.warning("  file missing: %s (%s)", pdf_path, title)
        return {"status": "missing"}
    if pdf_path.suffix.lower() != ".pdf":
        logger.info("  not a PDF, skipping: %s", title)
        return {"status": "not_pdf"}

    page_count = await pool.fetchval(
        "SELECT page_count FROM documents WHERE id = $1", document_id,
    )
    if not page_count:
        # Open to count
        import fitz
        d = fitz.open(str(pdf_path))
        page_count = len(d)
        d.close()

    logger.info("  embedding %s (%d pages)", title, page_count)
    t0 = time.time()
    result = await processor._embed_document_pages(
        document_id, case_id, pdf_path, page_count,
    )
    elapsed = time.time() - t0
    logger.info("  done in %.1fs: %s", elapsed, result)
    return {"status": "ok", "elapsed_sec": round(elapsed, 1), **result}


async def backfill_cases(case_numbers: list[str], skip_if_exists: bool = True) -> dict:
    """Embed page images for every PDF document in the given cases."""
    await db.init_schema()  # in case schema V9 hasn't been applied
    pool = await db.get_pool()
    summary: dict = {}
    for cn in case_numbers:
        logger.info("=" * 60)
        logger.info("Case %s", cn)
        case = await db.get_case_by_number(cn)
        if not case:
            logger.warning("Case not found: %s", cn)
            summary[cn] = {"status": "case_not_found"}
            continue
        case_id = UUID(str(case["id"]))
        docs = await pool.fetch(
            "SELECT id, title, file_path FROM documents WHERE case_id = $1 ORDER BY title",
            case_id,
        )
        logger.info("  %d documents", len(docs))
        per_doc: list[dict] = []
        for d in docs:
            doc_id = UUID(str(d["id"]))
            title = d["title"]
            r = await _backfill_document(
                doc_id, case_id, title, d["file_path"], skip_if_exists,
            )
            per_doc.append({"document_id": str(doc_id), "title": title, **r})
        summary[cn] = {
            "documents_total": len(docs),
            "embedded": sum(1 for r in per_doc if r["status"] == "ok"),
            "skipped": sum(1 for r in per_doc if r["status"] == "skipped"),
            "missing": sum(1 for r in per_doc if r["status"] == "missing"),
            "not_pdf": sum(1 for r in per_doc if r["status"] == "not_pdf"),
            "documents": per_doc,
        }
    return summary


def main():
    parser = argparse.ArgumentParser(description="Multimodal backfill for case documents")
    parser.add_argument(
        "cases", nargs="+", help="Case numbers to backfill (e.g. 8174-24 8137-24)"
    )
    parser.add_argument(
        "--re-embed", action="store_true",
        help="Re-embed even if image embeddings already exist (default: skip)",
    )
    args = parser.parse_args()

    logger.info("MULTIMODAL_MODEL=%s DPI=%d THUMB_DPI=%d",
                config.MULTIMODAL_MODEL, config.MULTIMODAL_DPI, config.MULTIMODAL_THUMB_DPI)
    summary = asyncio.run(
        backfill_cases(args.cases, skip_if_exists=not args.re_embed)
    )
    print()
    print("=" * 60)
    print("SUMMARY")
    print("=" * 60)
    for cn, s in summary.items():
        if s.get("status") == "case_not_found":
            print(f"  {cn}: NOT FOUND")
            continue
        print(
            f"  {cn}: {s['documents_total']} docs — "
            f"embedded {s['embedded']}, skipped {s['skipped']}, "
            f"missing {s['missing']}, non-pdf {s['not_pdf']}"
        )


if __name__ == "__main__":
    main()