"""
Docs index builder — scan docs/**/*.md, chunk, and populate docs_files / docs_chunks / docs_chunks_fts.
Run manually: python -m app.docs_index --rebuild
Or from repo root: SOFIIA_DOCS_ROOT=./docs python -m app.docs_index --rebuild
"""
from __future__ import annotations

import asyncio
import logging
import os
import sys
from datetime import datetime, timezone
from pathlib import Path
from typing import Optional

from . import db as _db
from .docs_store import clear_docs_index, insert_docs_file, set_docs_index_meta

logger = logging.getLogger(__name__)


def get_docs_root() -> Path:
    """SOFIIA_DOCS_ROOT or repo/docs (sofiia-console lives in repo/services/sofiia-console)."""
    env = os.getenv("SOFIIA_DOCS_ROOT", "").strip()
    if env:
        return Path(env).resolve()
    # app/docs_index.py -> app -> sofiia-console -> services -> repo
    repo = Path(__file__).resolve().parent.parent.parent.parent
    return (repo / "docs").resolve()


async def rebuild_index(docs_root: Optional[Path] = None) -> int:
    """Scan docs_root for **/*.md, clear index, insert all. Returns count of files indexed."""
    root = docs_root or get_docs_root()
    if not root.is_dir():
        logger.warning("Docs root not found: %s", root)
        return 0
    await _db.init_db()
    await clear_docs_index()
    count = 0
    for path in sorted(root.rglob("*.md")):
        try:
            content = path.read_text(encoding="utf-8", errors="replace")
        except Exception as e:
            logger.warning("Skip %s: %s", path, e)
            continue
        # Store path relative to repo (docs/runbook/...) for stable IDs
        try:
            rel = path.relative_to(root)
        except ValueError:
            rel = path.name
        path_key = str(rel).replace("\\", "/")
        mtime = path.stat().st_mtime
        await insert_docs_file(path_key, mtime, content)
        count += 1
    last_indexed_at = datetime.now(timezone.utc).isoformat()
    await set_docs_index_meta(str(root), last_indexed_at, sha="")
    logger.info("Docs index rebuilt: %s files from %s", count, root)
    return count


def main() -> int:
    import argparse
    p = argparse.ArgumentParser(description="Rebuild docs FTS index")
    p.add_argument("--rebuild", action="store_true", help="Clear and rebuild index")
    p.add_argument("--docs-root", type=str, default=None, help="Override docs directory")
    args = p.parse_args()
    if not args.rebuild:
        print("Use --rebuild to rebuild index.", file=sys.stderr)
        return 1
    logging.basicConfig(level=logging.INFO)
    root = Path(args.docs_root).resolve() if args.docs_root else None
    n = asyncio.run(rebuild_index(root))
    print(f"Indexed {n} files.")
    return 0


if __name__ == "__main__":
    sys.exit(main())