//スケジュールアシスタントが今後7日間の予定を投稿してくれる

function GoogleCalToMSTeams() {
  var list = "";
  var s;

  s = listupEvent("XXXXXXXXXXXXXXXXX@group.calendar.google.com"); //Boss' schedule
  if (s != "")  list += "  \n##■XXX's schedule  \n" + s + "  \n";

  s = listupEvent("XXXXXXXXXXXXXXXXX@group.calendar.google.com"); //OOO
  if (s != "")  list += "  \n##■Out of office (staff)  \n" + s + "  \n";

  s = listupEvent("XXXXXXXXXXXXXXXXX@group.calendar.google.com"); //XXX Group's Events
  if (s != "")  list += "  \n##■XXX events  \n" + s + "  \n";

  s = listupEvent("XXXXXXXXXXXXXXXXX@group.calendar.google.com"); //Office's Events
  if (s != "")  list += "  \n##■XXX Office events  \n" + s + "  \n";

  s = listupEvent("XXXXXXXXXXXXXXXXX@group.calendar.google.com"); //Due dates
  if (s != "")  list += "  \n##■Due dates  \n" + s+ "  \n";

  s = listupEvent("XXXXXXXXXXXXXXXXX@group.calendar.google.com"); //Office closing dates
  if (s != "")  list += "  \n##■Office closing dates  \n" + s + "  \n";

  Logger.log(list);

  if (list != "") {
    var payload = {
      "text" : "Hi, here's the latest schedule for the next 7 days.  \n" + "  \n" + list + "  \n" + "\n###Abbreviations:  \n"+"* BT = Business trip  \n* OOO = Out of office",

    }

    postTeams(payload);
  }

}

//1週間の予定をリストアップ
function listupEvent(cal_id)
{
  var list = "";
  var cal = CalendarApp.getCalendarById(cal_id);

  //1週間分の予定を確認
  var now = new Date();
  var end = new Date(now.getTime() + (7 * 24 * 60 * 60 * 1000));// 1週間後
  var events = cal.getEvents(now, end);


  for(var i=0; i < events.length; i++){
    s = "";

    if (events[i].isAllDayEvent()) {
      var startDate = new Date(events[i].getStartTime());
      var endDate = new Date(events[i].getEndTime()-(1 * 24 * 60 * 60 * 1000));

      if ((endDate-startDate)/(24 * 60 * 60 * 1000) <2) {
        s += Utilities.formatDate(events[i].getStartTime(),"GMT+0900","dd MMM  ");
      } else {
        s += Utilities.formatDate(events[i].getStartTime(),"GMT+0900","dd MMM ");
        s += Utilities.formatDate(endDate, "GMT+0900","- dd MMM  ");
      }
    } else {
      s += Utilities.formatDate(events[i].getStartTime(),"GMT+0900","dd MMM HH:mm");
      s += Utilities.formatDate(events[i].getEndTime(), "GMT+0900","-HH:mm  ");
    }
    s += events[i].getTitle();
    Logger.log(s);

    list += s + "  \n";
  }

  return list;
}

//MS Teamsへポスト
function postTeams(payload)
{
  // POSTオプション
  var options = {
    "method" : "POST",
    "payload" : JSON.stringify(payload)
  }

  // アクセス先
  var url = "XXXXXXXXXXXXXXXXXXXXX"; //WebHook URL
  // POSTリクエスト
  var response = UrlFetchApp.fetch(url, options);
  // HTML結果を取得（引数のcharsetは設定したほうが良い）
  var content = response.getContentText("UTF-8");

}