import dataclasses
import datetime
import operator

import datasets
import pandas as pd
import requests
import tqdm.auto


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

    def __post_init__(self):
        object.__setattr__(self, "published_at", PaperInfo.convert_timestamp(self.published_at))

    @staticmethod
    def convert_timestamp(timestamp: str) -> str:
        try:
            return datetime.datetime.strptime(timestamp, "%Y-%m-%dT%H:%M:%S.%fZ").strftime("%Y/%m/%d %H:%M:%S")
        except ValueError:
            return timestamp


def get_df() -> pd.DataFrame:
    df = datasets.load_dataset("hysts-internal/daily-papers")["train"].to_pandas()
    df = df.drop(columns=["title"])
    paper_info = []
    for _, row in tqdm.auto.tqdm(df.iterrows(), total=len(df)):
        res = requests.get(f"https://huggingface.co/api/papers/{row.arxiv_id}").json()
        info = PaperInfo(
            **row,
            title=res["title"],
            paper_page=f"https://huggingface.co/papers/{row.arxiv_id}",
            upvotes=res["upvotes"],
            published_at=res["publishedAt"],
        )
        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:
        df = df.sort_values("arxiv_id", ascending=False).reset_index(drop=True)
        new_rows = []
        for _, row in df.iterrows():
            new_row = dict(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),
                "github": self.get_github_link(row.github),
            }
            new_rows.append(new_row)
        return pd.DataFrame(new_rows, columns=df.columns)


class PaperList:
    COLUMN_INFO = [
        ["date", "markdown"],
        ["paper_page", "markdown"],
        ["title", "str"],
        ["github", "markdown"],
        ["upvotes", "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: str) -> 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, case=False)]

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