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1일전에 예정된 장소가 비면 메일이 온다

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function sendEmailForWeather() {
  const today = new Date();
  //dayLater が1なら明日、2なら明後日、3以降はお天気データが無いので無理です
  const dayLater = 1;
  //ミリ秒変換による次の日の取得 
  const date = new Date(today.getTime() + dayLater * 24 * 60 * 60 * 1000);
  //明日の予定の取得
  const events = getEventsByDate(date);

  events.map(function(e) {
    //CityIDの取得（細かくすると面倒臭かったのでその県の県庁所在地のCityIDを取得）
    const cityId = getCityIdByLocation(e.getLocation())
    if(cityId != null){
      const obj = JSON.parse(UrlFetchApp.fetch('http://weather.livedoor.com/forecast/webservice/json/v1?city=' + cityId));
      const weather = obj.forecasts[dayLater].image.title;
      if(weather.indexOf("雨") >= 0) {
        const body = "" + e.getTitle() + "\n" + date + "\n" + e.getLocation() + "\n" + weather;
        GmailApp.sendEmail('xxx@Eメール.アドレス', '予定の場所で天気が悪そうです', body);
      }
    } 
  })

  function getEventsByDate(date) {
    const calendarId = "カレンダーID";
    const calendar = CalendarApp.getCalendarById(calendarId);
    return calendar.getEventsForDay(date);
  }
  //CityIDの取得はいい方法ありそうだが、調べるのもっ面倒なので県の最初の2文字をkeyとして県庁所在地のCityIDをvalueとした
  function getCityIdByLocation(Location) {
    const cityId = {"北海":016010,"青森":020010,"岩手":030010,"宮城":040010,"秋田":050010,"山形":060010,"福島":070010,"東京":130010,"神奈":140010,"埼玉":110010,"千葉":120010,"茨城":080010,"栃木":090010,"群馬":100010,"山梨":190010,"新潟":150010,"長野":200010,"富山":160010,"石川":170010,"福井":180010,"愛知":230010,"岐阜":210010,"静岡":220010,"三重":240010,"大阪":270000,"兵庫":280010,"京都":260010,"滋賀":250010,"奈良":290010,"和歌":300010,"鳥取":310010,"島根":320010,"岡山":330010,"広島":340010,"山口":350020,"徳島":360010,"香川":370000,"愛媛":380010,"高知":390010,"福岡":400010,"大分":440010,"長崎":420010,"佐賀":410010,"熊本":430010,"宮崎":450010,"鹿児":460010,"沖縄":471010};
    return cityId[Location.slice(0,2)];
  }
}

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