import dataclasses
import datetime
import operator

import datasets
import pandas as pd
import tqdm.auto
from huggingface_hub import HfApi
from ragatouille import RAGPretrainedModel

api = HfApi()

INDEX_DIR_PATH = ".ragatouille/colbert/indexes/daily-papers-abstract-index/"
api.snapshot_download(
    repo_id="hysts-bot-data/daily-papers-abstract-index",
    repo_type="dataset",
    local_dir=INDEX_DIR_PATH,
)
ABSTRACT_RETRIEVER = RAGPretrainedModel.from_index(INDEX_DIR_PATH)
# Run once to initialize the retriever
ABSTRACT_RETRIEVER.search("LLM")


@dataclasses.dataclass(frozen=True)
class PaperInfo:
    date: str
    arxiv_id: str
    github: str
    title: str
    paper_page: str
    upvotes: int
    num_comments: int


def get_df() -> pd.DataFrame:
    df = pd.merge(
        left=datasets.load_dataset("hysts-bot-data/daily-papers", split="train").to_pandas(),
        right=datasets.load_dataset("hysts-bot-data/daily-papers-stats", split="train").to_pandas(),
        on="arxiv_id",
    )
    df = df[::-1].reset_index(drop=True)

    paper_info = []
    for _, row in tqdm.auto.tqdm(df.iterrows(), total=len(df)):
        info = PaperInfo(
            **row,
            paper_page=f"https://huggingface.co/papers/{row.arxiv_id}",
        )
        paper_info.append(info)
    return pd.DataFrame([dataclasses.asdict(info) for info in paper_info])


class Prettifier:
    @staticmethod
    def get_github_link(link: str) -> str:
        if not link:
            return ""
        return Prettifier.create_link("github", link)

    @staticmethod
    def create_link(text: str, url: str) -> str:
        return f'<a href="{url}" target="_blank">{text}</a>'

    @staticmethod
    def to_div(text: str | None, category_name: str) -> str:
        if text is None:
            text = ""
        class_name = f"{category_name}-{text.lower()}"
        return f'<div class="{class_name}">{text}</div>'

    def __call__(self, df: pd.DataFrame) -> pd.DataFrame:
        new_rows = []
        for _, row in df.iterrows():
            new_row = {
                "date": Prettifier.create_link(row.date, f"https://huggingface.co/papers?date={row.date}"),
                "paper_page": Prettifier.create_link(row.arxiv_id, row.paper_page),
                "title": row["title"],
                "github": self.get_github_link(row.github),
                "👍": row["upvotes"],
                "💬": row["num_comments"],
            }
            new_rows.append(new_row)
        return pd.DataFrame(new_rows)


class PaperList:
    COLUMN_INFO = [
        ["date", "markdown"],
        ["paper_page", "markdown"],
        ["title", "str"],
        ["github", "markdown"],
        ["👍", "number"],
        ["💬", "number"],
    ]

    def __init__(self, df: pd.DataFrame):
        self.df_raw = df
        self._prettifier = Prettifier()
        self.df_prettified = self._prettifier(df).loc[:, self.column_names]

    @property
    def column_names(self):
        return list(map(operator.itemgetter(0), self.COLUMN_INFO))

    @property
    def column_datatype(self):
        return list(map(operator.itemgetter(1), self.COLUMN_INFO))

    def search(
        self,
        start_date: datetime.datetime,
        end_date: datetime.datetime,
        title_search_query: str,
        abstract_search_query: str,
        max_num_to_retrieve: int,
    ) -> pd.DataFrame:
        df = self.df_raw.copy()
        df["date"] = pd.to_datetime(df["date"])

        # Filter by date
        df = df[(df["date"] >= start_date) & (df["date"] <= end_date)]
        df["date"] = df["date"].dt.strftime("%Y-%m-%d")

        # Filter by title
        df = df[df["title"].str.contains(title_search_query, case=False)]

        # Filter by abstract
        if abstract_search_query:
            results = ABSTRACT_RETRIEVER.search(abstract_search_query, k=max_num_to_retrieve)
            remaining_ids = set(df["arxiv_id"])
            found_id_set = set()
            found_ids = []
            for x in results:
                arxiv_id = x["document_id"]
                if arxiv_id not in remaining_ids:
                    continue
                if arxiv_id in found_id_set:
                    continue
                found_id_set.add(arxiv_id)
                found_ids.append(arxiv_id)
            df = df[df["arxiv_id"].isin(found_ids)].set_index("arxiv_id").reindex(index=found_ids).reset_index()

        df_prettified = self._prettifier(df).loc[:, self.column_names]
        return df_prettified