import axios from "axios";
import { HttpsProxyAgent } from "https-proxy-agent";

import getDateInTimezone from "./getDateInTimezone.js";

/**
 * 清理对象中的undefined值
 * @param {*} obj
 * @returns {Object}
 */
const cleanUndefined = (obj) => {
  return Object.fromEntries(
    Object.entries(obj).filter(([, v]) => v !== undefined)
  );
}

const axiosDefaultOptions = {
  baseURL: "https://gamma-api.polymarket.com",
  url: "",
  method: "GET",
  headers: {},
  params: {},
  data: {},
  timeout: 10000,
};

const fetchMarketData = async (options) => {
  const { url } = options;
  if (!url) {
    throw new Error("url is required");
  }
  const mergedOptions = { ...axiosDefaultOptions, ...options };
  const proxy = process.env.NODE_HTTP_PROXY;
  if (proxy) {
    mergedOptions.proxy = false;
    mergedOptions.httpsAgent = new HttpsProxyAgent(proxy);
  }
  return axios(mergedOptions).then(res => res.data);
};

/**
 * 获取有效联赛
 * @param {*} marketsData
 * @param {*} soccerSports
 * @returns {Array}
 */
const getLeagues = (marketsData, soccerSports) => {
  const soccerSportsMap = new Map(soccerSports.map(item => [+item.series, item]));
  const leaguesList = marketsData.map(item => {
    const { leagueId: id, leagueName: name } = item;
    const sport = soccerSportsMap.get(+id)?.sport;
    return { id, name, sport };
  });
  const leaguesMap = new Map(leaguesList.map(item => [item.id, item]));
  return Array.from(leaguesMap.values()).sort((a, b) => a.id - b.id);
}

/**
 * 获取足球联赛
 * @returns {Promise}
 */
const getSoccerSports = async () => {
  return fetchMarketData({ url: "/sports" })
  .then(sportsData => {
    return sportsData.filter(item => {
      const { tags } = item;
      const tagIds = tags.split(",").map(item => +item);
      return tagIds.includes(100350);
    });
  });
}

/**
 * 解析赛事标题
 * @param {*} eventTitle
 * @returns {Object}
 */
const parseTeamData = (eventTitle) => {
  const teamData = eventTitle.replace(' - More Markets', '').split(" vs. ");
  return {
    teamHomeName: teamData[0],
    teamAwayName: teamData[1],
  };
}

/**
 * 解析赛事数据
 * @param {*} event
 * @returns {Object}
 */
const parseEvent = (event) => {
  const { id, title, series, gameId, parentEventId, startTime } = event;
  const { teamHomeName, teamAwayName } = parseTeamData(title);
  const leagueId = series[0].id;
  const leagueName = series[0].title;
  const timestamp = new Date(startTime).getTime();
  return {
    id: +id,
    gameId: gameId ? +gameId : undefined,
    parentEventId: parentEventId ? +parentEventId : undefined,
    leagueId: +leagueId,
    teamHomeName, teamAwayName, leagueName,
    timestamp,
    startTime: getDateInTimezone('+8', timestamp, true),
  };
}

/**
 * 解析市场列表数据
 * @param {*} events
 * @returns {Object}
 */
const parseMarkets = (events) => {
  return events.map(parseEvent)
  .filter(item => !item.parentEventId)
  .map(cleanUndefined)
  .sort((a, b) => a.timestamp - b.timestamp);
}

/**
 * 获取赛事数据
 * @param {*} seriesIds
 * @returns {Promise}
 */
const getMarketsData = async (seriesIds = []) => {
  if (!seriesIds.length) {
    return [];
  }
  const endDateMin = new Date().toISOString();
  const tomorrowDateMinus4 = getDateInTimezone(-4, Date.now()+24*60*60*1000);
  const tomorrowGmtMinus4EndTime = new Date(`${tomorrowDateMinus4} 23:59:59 GMT-4`).getTime();
  const endDateMax = new Date(tomorrowGmtMinus4EndTime).toISOString();
  return Promise.all(seriesIds.map(seriesId => {
    return fetchMarketData({
      url: "/events",
      params: {
        series_id: +seriesId,
        active: true,
        closed: false,
        end_date_min: endDateMin,
        end_date_max: endDateMax,
      }
    })
  }))
  .then(eventsDataList => eventsDataList.flat())
  .then(eventsData => {
    return parseMarkets(eventsData);
  })
}

/**
 * 获取联赛和比赛列表
 * @returns {Promise}
 */
export const polymarketLeaguesAndGames = async () => {
  let soccerSports = [];
  return getSoccerSports()
  .then(sports => {
    soccerSports = sports;
    return sports.map(item => item.series)
  })
  .then(seriesIds => getMarketsData(seriesIds))
  .then(games => {
    const leagues = getLeagues(games, soccerSports);
    return { leagues, games };
  });
}