"""
ニコニコのニジカ動画取得モヂュール
"""

from __future__ import annotations

import os
from datetime import date, timedelta
from typing import TypedDict, cast

import requests
from bs4 import BeautifulSoup
from requests.exceptions import Timeout
from eloquent import DatabaseManager, Model

from db.models import Tag, Video, VideoHistory, VideoTag

CONFIG: dict[str, DbConfig] = { 'mysql': { 'driver':    'mysql',
                                           'host':      'localhost',
                                           'database':  'nizika_nico',
                                           'user':      os.environ['MYSQL_USER'],
                                           'password':  os.environ['MYSQL_PASS'],
                                           'prefix':    '' } }

DB = DatabaseManager (CONFIG)
Model.set_connection_resolver (DB)

KIRIBAN_VIEWS_COUNTS: set[int] = { *range (100, 1_000, 100),
                                   *range (1_000, 10_000, 1_000),
                                   *range (10_000, 1_000_001, 10_000),
                                   194, 245, 510, 114_514, 1_940, 2_450, 5_100, 24_500,
                                   51_000, 2_424 }


class VideoInfo (TypedDict):
    contentId:      str
    title:          str
    tags:           list[str]
    description:    str


def get_latest_deerjika (
) -> VideoInfo | None:
    tag = '伊地知ニジカ OR ぼざろクリーチャーシリーズ'
    url = f"https://www.nicovideo.jp/tag/{ tag }"

    params = { 'sort':  'f',
               'order': 'd' }

    video_info = { }

    bs = get_bs_from_url (url, params)
    if bs is None:
        return None

    try:
        video = (bs.find_all ('ul', class_ = 'videoListInner')[1]
                 .find ('li', class_ = 'item'))

        video_info['contentId'] = video['data-video-id']
    except Exception:
        return None

    return get_video_info (video_info['contentId'])


def get_bs_from_url (
        url:    str,
        params: dict    = { },
) -> BeautifulSoup | None:
    """
    URL から BeautifulSoup インスタンス生成

    Parameters
    ----------
    url:    str
        捜査する URL
    params: dict
        パラメータ

    Return
    ------
    BeautifulSoup | None
        BeautifulSoup オブゼクト（失敗したら None）
    """

    try:
        req = requests.get (url, params = params, timeout = 60)
    except Timeout:
        return None

    if req.status_code != 200:
        return None

    req.encoding = req.apparent_encoding

    return BeautifulSoup (req.text, 'html.parser')


def get_video_info (
        video_code: str,
) -> VideoInfo | None:
    video_info: dict[str, str | list[str]] = { 'contentId': video_code }

    bs = get_bs_from_url (f"https://www.nicovideo.jp/watch/{ video_code }")
    if bs is None:
        return None

    try:
        title = bs.find ('title')
        if title is None:
            return None
        video_info['title'] = '-'.join (title.text.split ('-')[:(-1)])[:(-1)]

        tags: str = bs.find ('meta', attrs = { 'name': 'keywords' }).get ('content') # type: ignore
        video_info['tags'] = tags.split (',')

        video_info['description'] = bs.find ('meta', attrs = { 'name': 'description' }).get ('content') # type: ignore
    except Exception:
        return None

    return cast (VideoInfo, video_info)


def get_kiriban_list (
        base_date:  date,
) -> list[tuple[int, VideoInfo]]:
    kiriban_list: list[tuple[int, VideoInfo]] = []

    latest_fetched_at = cast (date, VideoHistory.max ('fetched_at'))
    previous_fetched_at = cast (date, (VideoHistory
                                       .where ('fetched_at', '<', latest_fetched_at)
                                       .max ('fetched_at')))

    for kiriban_views_count in KIRIBAN_VIEWS_COUNTS:
        targets = ({ vh.video.code for vh in (VideoHistory
                                              .where ('fetched_at', latest_fetched_at)
                                              .where ('views_count', '>=', kiriban_views_count)
                                              .get ()) }
                   - { vh.video.code for vh in (VideoHistory
                                                .where ('fetched_at', previous_fetched_at)
                                                .where ('views_count', '>=', kiriban_views_count)
                                                .get ()) })
        for code in targets:
            video_info = get_video_info (code)
            if video_info is not None:
                kiriban_list.append ((kiriban_views_count, video_info))

    return kiriban_list


class DbConfig (TypedDict):
    driver:     str
    host:       str
    database:   str
    user:       str
    password:   str
    prefix:     str