"""Ingest preprocessed NYC code JSON files into ChromaDB with bge-large-en-v1.5."""
from __future__ import annotations

import json
import os
import sys

import chromadb
from chromadb.utils import embedding_functions


EMBEDDING_MODEL = "BAAI/bge-large-en-v1.5"
COLLECTION_NAME = "nyc_building_codes"
DB_PATH = os.path.join(os.path.dirname(__file__), "nyc_code_db")

# Map of JSON files to their code types
CODE_FILES = {
    "BUILDING_CODE.json": "Building",
    "FUEL_GAS_CODE.json": "FuelGas",
    "GENERAL_ADMINISTRATIVE_PROVISIONS.json": "Administrative",
    "MECHANICAL_CODE.json": "Mechanical",
    "PLUMBING_CODE.json": "Plumbing",
}


def create_collection(db_path: str = DB_PATH, reset: bool = True):
    """Create or reset the ChromaDB collection."""
    client = chromadb.PersistentClient(path=db_path)
    embedding_fn = embedding_functions.SentenceTransformerEmbeddingFunction(
        model_name=EMBEDDING_MODEL,
    )

    if reset:
        try:
            client.delete_collection(name=COLLECTION_NAME)
            print(f"Deleted existing collection '{COLLECTION_NAME}'.")
        except Exception:
            pass

    collection = client.create_collection(
        name=COLLECTION_NAME,
        embedding_function=embedding_fn,
    )
    return client, collection


def ingest_json_file(collection, json_path: str, code_type: str) -> int:
    """Ingest a single JSON file into the collection. Returns count of sections added."""
    with open(json_path, "r", encoding="utf-8") as f:
        data = json.load(f)

    documents = []
    metadatas = []
    ids = []
    seen_ids: set[str] = set()

    for entry in data:
        meta = entry["metadata"]
        # Ensure code_type is set (should already be from preprocessing)
        meta["code_type"] = code_type

        unique_id = f"{code_type}_{entry['id']}"
        if unique_id in seen_ids:
            continue

        # Flatten list-type metadata for ChromaDB (only supports str/int/float/bool)
        flat_meta = {}
        for k, v in meta.items():
            if isinstance(v, list):
                flat_meta[k] = ", ".join(str(x) for x in v) if v else ""
            elif isinstance(v, bool):
                flat_meta[k] = v
            elif isinstance(v, (int, float)):
                flat_meta[k] = v
            else:
                flat_meta[k] = str(v)

        documents.append(entry["text"])
        metadatas.append(flat_meta)
        ids.append(unique_id)
        seen_ids.add(unique_id)

    # Batch upsert
    batch_size = 200  # Smaller batches for larger embeddings
    for i in range(0, len(documents), batch_size):
        batch_end = min(i + batch_size, len(documents))
        collection.upsert(
            documents=documents[i:batch_end],
            metadatas=metadatas[i:batch_end],
            ids=ids[i:batch_end],
        )
        print(f"  Batch {i // batch_size + 1}: upserted {batch_end - i} sections")

    return len(ids)


def ingest_all(data_dir: str, db_path: str = DB_PATH) -> dict[str, int]:
    """Ingest all code JSON files into a fresh ChromaDB collection."""
    print(f"Creating ChromaDB at {db_path} with embedding model: {EMBEDDING_MODEL}")
    _client, collection = create_collection(db_path, reset=True)

    counts: dict[str, int] = {}
    for filename, code_type in CODE_FILES.items():
        json_path = os.path.join(data_dir, filename)
        if os.path.exists(json_path):
            print(f"\nIngesting {filename} as '{code_type}'...")
            count = ingest_json_file(collection, json_path, code_type)
            counts[code_type] = count
            print(f"  -> {count} sections ingested")
        else:
            print(f"WARNING: {json_path} not found, skipping.")

    total = sum(counts.values())
    print(f"\nIngestion complete. Total: {total} sections across {len(counts)} code types.")
    return counts


if __name__ == "__main__":
    data_dir = sys.argv[1] if len(sys.argv) > 1 else os.path.dirname(__file__)
    ingest_all(data_dir)