#!/usr/bin/env python3
"""
Index Heritage Institutions in Qdrant

This script reads heritage custodian YAML files and indexes them in Qdrant
for semantic search and RAG-enhanced SPARQL generation.

Usage:
    python scripts/index_institutions_qdrant.py [--data-dir DATA_DIR] [--host HOST] [--port PORT]
    
Examples:
    # Index all institutions from default data directory
    python scripts/index_institutions_qdrant.py
    
    # Index from specific directory
    python scripts/index_institutions_qdrant.py --data-dir data/custodian/
    
    # Connect to remote Qdrant
    python scripts/index_institutions_qdrant.py --host 91.98.224.44 --port 6333
"""

import argparse
import logging
import os
import sys
from pathlib import Path
from typing import Any

import yaml

# Add project root to path
PROJECT_ROOT = Path(__file__).parent.parent
sys.path.insert(0, str(PROJECT_ROOT / "src"))

logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s [%(levelname)s] %(message)s",
    datefmt="%Y-%m-%d %H:%M:%S"
)
logger = logging.getLogger(__name__)


def load_yaml_file(filepath: Path) -> dict[str, Any] | None:
    """Load a YAML file and return its contents."""
    try:
        with open(filepath, "r", encoding="utf-8") as f:
            return yaml.safe_load(f)
    except Exception as e:
        logger.warning(f"Failed to load {filepath}: {e}")
        return None


def extract_institution_text(data: dict[str, Any]) -> str:
    """Extract searchable text from institution data."""
    parts = []
    
    # Get original_entry if present (our actual file format)
    original = data.get("original_entry", {})
    
    # Name (primary identifier) - try multiple locations
    name = (
        data.get("custodian_name", {}).get("claim_value") or  # New format
        data.get("custodian_name", {}).get("emic_name") or
        original.get("name") or
        data.get("name", "")
    )
    if name:
        parts.append(f"Name: {name}")
    
    # Alternative names from Wikidata enrichment
    wikidata = data.get("wikidata_enrichment", {})
    labels = wikidata.get("wikidata_labels", {})
    if labels:
        alt_names = [v for k, v in labels.items() if v and v != name][:5]
        if alt_names:
            parts.append(f"Also known as: {', '.join(set(alt_names))}")
    
    # Description from Wikidata
    description = wikidata.get("wikidata_description_en", "")
    if not description:
        descriptions = wikidata.get("wikidata_descriptions", {})
        description = descriptions.get("en", "")
    if description:
        parts.append(description)
    
    # Institution type
    inst_type = original.get("institution_type") or data.get("institution_type", "")
    if inst_type:
        parts.append(f"Type: {inst_type}")
    
    # Location - try multiple locations
    locations = original.get("locations", []) or data.get("locations", [])
    location = data.get("location", {})
    
    def safe_str(val):
        """Safely convert value to string, handling dicts and None."""
        if val is None:
            return None
        if isinstance(val, str):
            return val
        if isinstance(val, dict):
            # Try common keys for nested location dicts
            return val.get("name") or val.get("label") or val.get("value") or str(val)
        return str(val)
    
    if locations:
        for loc in locations[:1]:  # Just first location
            if not isinstance(loc, dict):
                continue
            loc_parts = []
            city = safe_str(loc.get("city"))
            region = safe_str(loc.get("region"))
            country = safe_str(loc.get("country"))
            if city:
                loc_parts.append(city)
            if region:
                loc_parts.append(region)
            if country:
                loc_parts.append(country)
            if loc_parts:
                parts.append(f"Location: {', '.join(loc_parts)}")
    elif location and isinstance(location, dict):
        loc_parts = []
        city = safe_str(location.get("city"))
        region = safe_str(location.get("region"))
        country = safe_str(location.get("country"))
        if city:
            loc_parts.append(city)
        if region:
            loc_parts.append(region)
        if country:
            loc_parts.append(country)
        if loc_parts:
            parts.append(f"Location: {', '.join(loc_parts)}")
    
    # GHCID for reference
    ghcid = data.get("ghcid", {}).get("ghcid_current", "")
    if ghcid:
        parts.append(f"GHCID: {ghcid}")
    
    # Collections
    collections = data.get("collections", [])
    if collections and isinstance(collections, list):
        for coll in collections[:3]:  # Limit to first 3
            if isinstance(coll, dict):
                coll_name = coll.get("name", coll.get("collection_name", ""))
                coll_desc = coll.get("description", "")
                if coll_name:
                    parts.append(f"Collection: {coll_name}")
                if coll_desc:
                    parts.append(coll_desc[:200])  # Truncate long descriptions
    
    # MoW inscriptions
    mow = original.get("mow_inscriptions", [])
    if mow and isinstance(mow, list):
        for inscription in mow[:2]:
            if isinstance(inscription, dict):
                mow_name = inscription.get("name", "")
                if mow_name:
                    parts.append(f"Memory of the World: {mow_name}")
    
    # Combine all parts
    return "\n".join(parts)


def extract_metadata(data: dict[str, Any], filepath: Path) -> dict[str, Any]:
    """Extract metadata for filtering from institution data."""
    metadata = {
        "filename": filepath.name,
    }
    
    # Get original_entry if present (our actual file format)
    original = data.get("original_entry", {})
    
    # GHCID
    ghcid = data.get("ghcid", {}).get("ghcid_current", "")
    if ghcid:
        metadata["ghcid"] = ghcid
    
    # Name - try multiple locations
    name = (
        data.get("custodian_name", {}).get("claim_value") or
        data.get("custodian_name", {}).get("emic_name") or
        original.get("name") or
        data.get("name", "")
    )
    if name:
        metadata["name"] = name
    
    # Institution type
    inst_type = original.get("institution_type") or data.get("institution_type", "")
    if inst_type:
        metadata["institution_type"] = inst_type
    
    # Location - try multiple locations
    locations = original.get("locations", []) or data.get("locations", [])
    location = data.get("location", {})
    
    if locations:
        loc = locations[0]  # First location
        if loc.get("country"):
            metadata["country"] = loc["country"]
        if loc.get("city"):
            metadata["city"] = loc["city"]
        # Use region_code (ISO 3166-2) for filtering, fallback to region name
        if loc.get("region_code"):
            metadata["region"] = loc["region_code"]  # e.g., "NH" not "Noord-Holland"
        elif loc.get("region"):
            metadata["region"] = loc["region"]
    elif location:
        if location.get("country"):
            metadata["country"] = location["country"]
        if location.get("city"):
            metadata["city"] = location["city"]
        # Use region_code (ISO 3166-2) for filtering, fallback to region name
        if location.get("region_code"):
            metadata["region"] = location["region_code"]  # e.g., "NH" not "Noord-Holland"
        elif location.get("region"):
            metadata["region"] = location["region"]
    
    # Also extract country from GHCID if not found elsewhere
    if not metadata.get("country") and ghcid:
        parts = ghcid.split("-")
        if parts:
            metadata["country"] = parts[0]
    
    # Extract coordinates (latitude/longitude) from multiple sources
    # Priority: 1. Top-level lat/lon, 2. Google Maps, 3. Wikidata, 4. locations array
    lat = None
    lon = None
    
    # 1. Top-level latitude/longitude (most reliable - merged from enrichment)
    lat = data.get("latitude")
    lon = data.get("longitude")
    
    # 2. Google Maps enrichment
    if lat is None or lon is None:
        google_maps = data.get("google_maps_enrichment", {})
        coords = google_maps.get("coordinates", {})
        if coords:
            lat = lat or coords.get("latitude")
            lon = lon or coords.get("longitude")
    
    # 3. Wikidata enrichment (headquarter_location.coordinates or wikidata_coordinates)
    if lat is None or lon is None:
        wikidata = data.get("wikidata_enrichment", {})
        # Try wikidata_coordinates first (YAML anchor reference)
        wikidata_coords = wikidata.get("wikidata_coordinates", {})
        if wikidata_coords:
            lat = lat or wikidata_coords.get("latitude")
            lon = lon or wikidata_coords.get("longitude")
        # Then try headquarter_location.coordinates
        hq_location = wikidata.get("headquarter_location", {})
        hq_coords = hq_location.get("coordinates", {})
        if hq_coords:
            lat = lat or hq_coords.get("latitude")
            lon = lon or hq_coords.get("longitude")
    
    # 4. Locations array
    if lat is None or lon is None:
        if locations and isinstance(locations[0], dict):
            loc = locations[0]
            lat = lat or loc.get("latitude") or loc.get("lat")
            lon = lon or loc.get("longitude") or loc.get("lon")
    
    # Store coordinates if found
    if lat is not None:
        try:
            metadata["latitude"] = float(lat)
        except (ValueError, TypeError):
            pass
    if lon is not None:
        try:
            metadata["longitude"] = float(lon)
        except (ValueError, TypeError):
            pass
    
    # Wikidata ID
    wikidata_id = (
        original.get("wikidata_id") or 
        data.get("wikidata_enrichment", {}).get("wikidata_entity_id", "")
    )
    if wikidata_id:
        metadata["wikidata_id"] = wikidata_id
    
    # Identifiers
    identifiers = data.get("identifiers", [])
    for ident in identifiers:
        if isinstance(ident, dict):
            scheme = ident.get("identifier_scheme", "").lower()
            value = ident.get("identifier_value", "")
            if scheme and value and scheme not in ["ghcid", "ghcid_uuid", "ghcid_uuid_sha256", "ghcid_numeric", "record_id"]:
                metadata[f"id_{scheme}"] = str(value)
    
    return metadata


def find_institution_files(data_dir: Path) -> list[Path]:
    """Find all institution YAML files in the data directory.
    
    Optimized for large directories using os.listdir instead of glob.
    """
    import os
    
    files = []
    
    # Filter patterns
    excluded_patterns = [
        "_schema",
        "_config",
        "_template",
        "test_",
        "example_",
    ]
    
    def is_valid_file(name: str) -> bool:
        """Check if file is a valid institution YAML file."""
        if not name.endswith(('.yaml', '.yml')):
            return False
        if name.startswith('.'):
            return False
        name_lower = name.lower()
        return not any(excl in name_lower for excl in excluded_patterns)
    
    # Get top-level YAML files (most common case - fast with os.listdir)
    try:
        for name in os.listdir(data_dir):
            if is_valid_file(name):
                filepath = data_dir / name
                if filepath.is_file():
                    files.append(filepath)
    except PermissionError:
        logger.warning(f"Permission denied accessing {data_dir}")
    
    # Check known subdirectories for additional files
    known_subdirs = ["person", "web", "archived"]
    for subdir in known_subdirs:
        subdir_path = data_dir / subdir
        if subdir_path.exists():
            for root, _, filenames in os.walk(subdir_path):
                root_path = Path(root)
                for name in filenames:
                    if is_valid_file(name):
                        files.append(root_path / name)
    
    return sorted(files)


def main():
    parser = argparse.ArgumentParser(
        description="Index heritage institutions in Qdrant for semantic search"
    )
    parser.add_argument(
        "--data-dir",
        type=Path,
        default=PROJECT_ROOT / "data" / "custodian",
        help="Directory containing institution YAML files"
    )
    parser.add_argument(
        "--host",
        default=os.getenv("QDRANT_HOST", "localhost"),
        help="Qdrant server hostname"
    )
    parser.add_argument(
        "--port",
        type=int,
        default=int(os.getenv("QDRANT_PORT", "6333")),
        help="Qdrant REST API port"
    )
    parser.add_argument(
        "--url",
        default=os.getenv("QDRANT_URL", ""),
        help="Full Qdrant URL (e.g., https://bronhouder.nl/qdrant). Overrides host/port."
    )
    parser.add_argument(
        "--collection",
        default="heritage_custodians",
        help="Qdrant collection name"
    )
    parser.add_argument(
        "--batch-size",
        type=int,
        default=50,
        help="Number of documents to index per batch"
    )
    parser.add_argument(
        "--recreate",
        action="store_true",
        help="Delete and recreate the collection"
    )
    parser.add_argument(
        "--dry-run",
        action="store_true",
        help="Parse files but don't index"
    )
    parser.add_argument(
        "--limit",
        type=int,
        default=None,
        help="Limit number of files to process (for testing)"
    )
    
    args = parser.parse_args()
    
    # Check data directory exists
    if not args.data_dir.exists():
        logger.error(f"Data directory not found: {args.data_dir}")
        sys.exit(1)
    
    # Find institution files
    logger.info(f"Scanning for institution files in {args.data_dir}")
    files = find_institution_files(args.data_dir)
    logger.info(f"Found {len(files)} institution files")
    
    # Apply limit if specified
    if args.limit:
        files = files[:args.limit]
        logger.info(f"Limited to {len(files)} files for processing")
    
    if not files:
        logger.warning("No institution files found")
        sys.exit(0)
    
    # Prepare documents
    documents = []
    for filepath in files:
        data = load_yaml_file(filepath)
        if not data:
            continue
        
        text = extract_institution_text(data)
        if not text or len(text) < 20:
            logger.debug(f"Skipping {filepath.name}: insufficient text")
            continue
        
        metadata = extract_metadata(data, filepath)
        
        documents.append({
            "text": text,
            "metadata": metadata,
        })
    
    logger.info(f"Prepared {len(documents)} documents for indexing")
    
    if args.dry_run:
        logger.info("Dry run - not indexing")
        for doc in documents[:5]:
            logger.info(f"  - {doc['metadata'].get('name', 'Unknown')}: {len(doc['text'])} chars")
        sys.exit(0)
    
    # Import and create retriever
    try:
        from glam_extractor.api.qdrant_retriever import HeritageCustodianRetriever
    except ImportError as e:
        logger.error(f"Failed to import retriever: {e}")
        logger.error("Make sure qdrant-client and openai are installed:")
        logger.error("  pip install qdrant-client openai")
        sys.exit(1)
    
    # Check for OpenAI API key
    if not os.getenv("OPENAI_API_KEY"):
        logger.error("OPENAI_API_KEY environment variable is required for embeddings")
        sys.exit(1)
    
    # Connect to Qdrant
    if args.url:
        logger.info(f"Connecting to Qdrant at {args.url}")
        retriever = HeritageCustodianRetriever(url=args.url)
    else:
        logger.info(f"Connecting to Qdrant at {args.host}:{args.port}")
        retriever = HeritageCustodianRetriever(
            host=args.host,
            port=args.port,
        )
    
    # Optionally recreate collection
    if args.recreate:
        logger.warning(f"Deleting collection: {retriever.collection_name}")
        retriever.delete_collection()
    
    # Ensure collection exists
    retriever.ensure_collection()
    
    # Index documents
    logger.info(f"Indexing {len(documents)} documents...")
    indexed = retriever.add_documents(documents, batch_size=args.batch_size)
    
    # Report results
    info = retriever.get_collection_info()
    logger.info("Indexing complete!")
    logger.info(f"  Documents indexed: {indexed}")
    logger.info(f"  Collection status: {info.get('status', 'unknown')}")
    logger.info(f"  Total vectors: {info.get('vectors_count', 0)}")


if __name__ == "__main__":
    main()