//程式碼開始
var Line_Notify_Token = "y9m61pJjHAki8yNi9jfn8BOmuFOYUPjtLfQ5sXbRa4U";    //Line Notify 的權杖
var rootFolderID = "1o_vJz2qn0NApFbce5PnsGGsKrBZxmw4Y";    //存放信件附件的資料夾
var labelNames = ["CCTV"];    //inbox 就是收件夾，但這樣會搜尋所有信件，降低程式持行效率，建議還是自行新增標籤及建立篩選器來提升效率
var everyMailinLabel = 1;    //設為 0：只傳送標籤內每個會話群組內第一封未讀取的郵件； 設為 1：傳送標籤內每個會話群組每一封未讀取的郵件。
function getGmailMessage() {
  var labels = "";
  var endNum = 1;
 
  for (var i = 0; i < labelNames.length; i++) {
    labels += "label:" + labelNames[i] + " ";
  }
    if (everyMailinLabel === 1) {var Emails = GmailApp.search(labels);}
  else {var Emails = GmailApp.search(labels + "label:unread");}
  for (var i = Emails.length - 1; i >= 0 ; i--){
    var messageData = Emails[i].getMessages();
    if (everyMailinLabel == 1) {endNum = messageData.length;}
    for (var j = 0; j < endNum; j++) {
      if (messageData[j].isUnread()) {
        var messageSubject = messageData[j].getSubject();
        var messageFrom = removeHtmlTag(messageData[j].getFrom());
        var messageBody = removeHtmlTag(messageData[j].getBody());
        var lineContent = "\n\n來自：" + messageFrom + "\n\n";
        lineContent += "主旨：" + messageSubject + "\n\n";
        lineContent += "內容：\n" + messageBody;
        var messageAttachments = messageData[j].getAttachments();
        if (messageAttachments.length > 0) {
          var rootFolder = DriveApp.getFolderById(rootFolderID);
          try {
            var destinationFolder = rootFolder.getFoldersByName(messageData[j].getId()).next();
          }
          catch(err) {
            var destinationFolder = rootFolder.createFolder(messageData[j].getId());
          }
          var fileLocation = "https://drive.google.com/open?id=" + destinationFolder.getId();
          for (var k = 0; k < messageAttachments.length; k++) {
            var files = destinationFolder.createFile(messageAttachments[k].copyBlob());
            files.setName(messageAttachments[k].getName());
          }
          lineContent += "\n\n附件：請參閱 " + fileLocation;
        }
        sendLineNotify(lineContent, Line_Notify_Token);
        messageData[j].markRead();
      }
    }
  }
}
//傳送 Line Notify 訊息
function sendLineNotify(message, Line_Notify_Token){
  var url = "https://notify-api.line.me/api/notify";
 
  var options =
   {
     "method"  : "post",
     "payload" : {"message" : message},
     "headers" : {"Authorization" : "Bearer " + Line_Notify_Token}
   };
   return UrlFetchApp.fetch(url, options);
}
//清除 html 標籤
function removeHtmlTag(stringContent) {
  stringContent = stringContent.replace(/<div(?:.|\s)*?>/g, "\n");
  var reTag = /<(?:.|\s)*?>/g;
  stringContent = stringContent.replace(reTag, "");
  stringContent = stringContent.replace(/&lt;/g, "<");
  return stringContent.replace(/&gt;/g, ">");
}
//程式碼結束