よく風邪を引くのでちょうどいい布団を教えてくれるLINE BOT作った

const line = require('@line/bot-sdk');
const client = new line.Client({
  channelSecret: process.env.LINE_CHANNEL_SECRET,
  channelAccessToken: process.env.LINE_CHANNEL_ACCESS_TOKEN,
});
const axios = require('axios');
const dayjs = require('dayjs');

const weatherApiConfig = {
  key: process.env.WEATHER_API_KEY,
};

interface PeriodInterface {
  begin: string;
  end: string;
}

interface WeatherInfoInterface {
  min: number;
  max: number;
  humidity: number;
}

interface BedclothesInterface {
  best: string;
}

exports.handler = async (event: any) => {
  const body = JSON.parse(event.body);
  console.log('event', JSON.stringify(event));
  console.log('body', JSON.stringify(body));

  if (body.events[0].replyToken === '00000000000000000000000000000000' && body.events[1].replyToken === 'ffffffffffffffffffffffffffffffff') {
    console.log('Developerコンソールからの疎通確認');
    return {
      statusCode: 200,
    };
  }

  try {
    const result = await Promise.all(body.events.map(handleEvent));
    console.log('result', JSON.stringify(result));

    return {
      statusCode: 200,
    };
  } catch (e) {
    console.error(JSON.stringify(e));

    return {
      statusCode: 500,
    };
  }
};

const handleEvent = async (event: any) => {
  if (event.type !== 'message' || event.message.type !== 'text') {
    return Promise.resolve(null);
  }

  const weathers = await axios.get(`${process.env.WEATHER_API_BASE_URL}/forecast?q=tokyo&units=metric&lang=ja&APPID=${weatherApiConfig.key}`);
  console.log(weathers.data.list);

  const { begin, end } = getPeriod();
  console.log({ begin, end });

  // 取得した天気リストの中から、夜9時～翌6時の情報のみに絞る
  const nightWeathers = weathers.data.list.filter((weather: any) => {
    return begin < weather.dt && weather.dt < end;
  });
  console.log({ nightWeathers: JSON.stringify(nightWeathers) });

  const weather = selectOne(nightWeathers);
  console.log(weather);

  const bestBedclothes = getBestBedClothes(weather);
  console.log({ bestBedclothes });

  return client.replyMessage(event.replyToken, {
    type: 'text',
    text: `今夜は、${bestBedclothes.best}がおすすめです。\n\n睡眠気温\n最高気温：${Math.round(weather.max * 10) / 10}℃\n最低気温：${Math.round(weather.min * 10) / 10}℃\n湿度　　：${weather.humidity}%`,
  });
};

// 9時～翌6時のデータを取得するための、UNIX時間を計算する
const getPeriod = (): PeriodInterface => {
  const today = dayjs();
  const begin = today.hour(20).endOf('hour').unix();
  const end = today.add(1, 'day').hour(6).startOf('hour').unix();

  return {
    begin,
    end,
  };
};

// 取得した天気リストの中から、最高気温、最低気温、最高湿度を選ぶ
const selectOne = (weathers: any): WeatherInfoInterface => {
  let min = 100;
  let max = -20;
  let humidity = 0;

  for (const nightWeather of weathers) {
    min = min < nightWeather.main.temp ? min : nightWeather.main.temp;
    max = max > nightWeather.main.temp ? max : nightWeather.main.temp;
    humidity = humidity > nightWeather.main.humidity ? humidity : nightWeather.main.humidity;
  }

  return { min, max, humidity };
};

// 気温を基に、最適な布団を選択する
const getBestBedClothes = (weather: WeatherInfoInterface): BedclothesInterface => {
  let best = 'タオルケット';
  if (weather.min < 10) {
    best = '羽毛布団 + 毛布';
  } else if (weather.min < 15) {
    best = '羽毛布団';
  } else if (weather.min < 20) {
    best = '薄手の掛け布団';
  }

  return {
    best,
  };
};