import logging
import os
from datetime import datetime
from typing import List, Optional, Tuple

import polars as pl
import requests
import stamina
from chromadb.utils import embedding_functions
from dotenv import load_dotenv
from huggingface_hub import InferenceClient
from tqdm.contrib.concurrent import thread_map
from utils import get_chroma_client, get_collection

os.environ["HF_HUB_ENABLE_HF_TRANSFER"] = "1"
# Set up logging
logging.basicConfig(
    level=logging.INFO, format="%(asctime)s - %(levelname)s - %(message)s"
)
logger = logging.getLogger(__name__)

load_dotenv()


HF_TOKEN = os.getenv("HF_TOKEN")
EMBEDDING_MODEL_NAME = "Alibaba-NLP/gte-large-en-v1.5"
EMBEDDING_MODEL_REVISION = "104333d6af6f97649377c2afbde10a7704870c7b"
INFERENCE_MODEL_URL = (
    "https://spwy1g6626yhjhpr.us-east-1.aws.endpoints.huggingface.cloud"
)
DATASET_PARQUET_URL = (
    "hf://datasets/librarian-bots/dataset_cards_with_metadata/data/train-*.parquet"
)
COLLECTION_NAME = "dataset_cards"

MAX_EMBEDDING_LENGTH = 8192


def card_embedding_function():
    logger.info(f"Initializing embedding function with model: {EMBEDDING_MODEL_NAME}")
    return embedding_functions.SentenceTransformerEmbeddingFunction(
        model_name=EMBEDDING_MODEL_NAME,
        trust_remote_code=True,
        revision=EMBEDDING_MODEL_REVISION,
    )


def get_last_modified_in_collection(collection) -> datetime | None:
    logger.info("Fetching last modified date from collection")
    try:
        all_items = collection.get(include=["metadatas"])
        if last_modified := [
            datetime.fromisoformat(item["last_modified"])
            for item in all_items["metadatas"]
        ]:
            last_mod = max(last_modified)
            logger.info(f"Last modified date: {last_mod}")
            return last_mod
        else:
            logger.info("No last modified date found")
            return None
    except Exception as e:
        logger.error(f"Error fetching last modified date: {str(e)}")
        return None


def parse_markdown_column(
    df: pl.DataFrame, markdown_column: str, dataset_id_column: str
) -> pl.DataFrame:
    logger.info("Parsing markdown column")
    return df.with_columns(
        parsed_markdown=(
            pl.col(markdown_column)
            .str.extract(r"(?s)^---.*?---\s*(.*)", group_index=1)
            .fill_null(pl.col(markdown_column))
            .str.strip_chars()
        ),
        prepended_markdown=(
            pl.concat_str(
                [
                    pl.lit("Dataset ID "),
                    pl.col(dataset_id_column).cast(pl.Utf8),
                    pl.lit("\n\n"),
                    pl.col(markdown_column)
                    .str.extract(r"(?s)^---.*?---\s*(.*)", group_index=1)
                    .fill_null(pl.col(markdown_column))
                    .str.strip_chars(),
                ]
            )
        ),
    )


def is_unmodified_template(card: str) -> bool:
    # Check for a combination of template-specific phrases
    template_indicators = [
        "# Dataset Card for Dataset Name",
        "<!-- Provide a quick summary of the dataset. -->",
        "This dataset card aims to be a base template for new datasets",
        "[More Information Needed]",
    ]

    # Count how many indicators are present
    indicator_count = sum(indicator in card for indicator in template_indicators)

    # Check if the card contains a high number of "[More Information Needed]" occurrences
    more_info_needed_count = card.count("[More Information Needed]")

    # Consider it an unmodified template if it has most of the indicators
    # and a high number of "[More Information Needed]" occurrences
    return indicator_count >= 3 or more_info_needed_count >= 7


def load_cards(
    min_len: int = 50,
    min_likes: int | None = None,
    last_modified: Optional[datetime] = None,
) -> Optional[Tuple[List[str], List[str], List[datetime]]]:
    logger.info(
        f"Loading cards with min_len={min_len}, min_likes={min_likes}, last_modified={last_modified}"
    )
    df = pl.read_parquet(DATASET_PARQUET_URL)
    df = df.filter(~pl.col("tags").list.contains("not-for-all-audiences"))
    df = parse_markdown_column(df, "card", "datasetId")
    df = df.with_columns(pl.col("parsed_markdown").str.len_chars().alias("card_len"))
    df = df.filter(pl.col("card_len") > min_len)
    if min_likes:
        df = df.filter(pl.col("likes") > min_likes)
    if last_modified:
        df = df.filter(pl.col("last_modified") > last_modified)

    # Filter out unmodified template cards
    df = df.filter(
        ~pl.col("prepended_markdown").map_elements(
            is_unmodified_template, return_dtype=pl.Boolean
        )
    )

    if len(df) == 0:
        logger.info("No cards found matching criteria")
        return None

    cards = df.get_column("prepended_markdown").to_list()
    model_ids = df.get_column("datasetId").to_list()
    last_modifieds = df.get_column("last_modified").to_list()
    logger.info(f"Loaded {len(cards)} cards")
    return cards, model_ids, last_modifieds


@stamina.retry(on=requests.HTTPError, attempts=3, wait_initial=10)
def embed_card(text, client):
    text = text[:MAX_EMBEDDING_LENGTH]
    return client.feature_extraction(text)


def get_inference_client():
    logger.info(f"Initializing inference client with model: {INFERENCE_MODEL_URL}")
    return InferenceClient(
        model=INFERENCE_MODEL_URL,
        token=HF_TOKEN,
    )


def refresh_card_data(min_len: int = 250, min_likes: Optional[int] = None):
    logger.info(f"Starting data refresh with min_len={min_len}, min_likes={min_likes}")
    chroma_client = get_chroma_client()
    embedding_function = card_embedding_function()
    collection = get_collection(chroma_client, embedding_function, COLLECTION_NAME)
    most_recent = get_last_modified_in_collection(collection)

    if data := load_cards(
        min_len=min_len, min_likes=min_likes, last_modified=most_recent
    ):
        _create_and_upsert_embeddings(data, collection)
    else:
        logger.info("No new data to refresh")


def _create_and_upsert_embeddings(data, collection):
    cards, model_ids, last_modifieds = data
    logger.info("Embedding cards...")
    inference_client = get_inference_client()
    results = thread_map(lambda card: embed_card(card, inference_client), cards)
    logger.info(f"Upserting {len(model_ids)} items to collection")
    collection.upsert(
        ids=model_ids,
        embeddings=[embedding.tolist()[0] for embedding in results],
        metadatas=[{"last_modified": str(lm)} for lm in last_modifieds],
    )
    logger.info("Data refresh completed successfully")


if __name__ == "__main__":
    refresh_card_data()