Class GmailApp

// The code below creates a draft email with the current date and time.
var now = new Date();
GmailApp.createDraft("mike@example.com", "current time", "The time is: " + now.toString());

// Create a draft email with a file from Google Drive attached as a PDF.
var file = DriveApp.getFileById('1234567890abcdefghijklmnopqrstuvwxyz');
GmailApp.createDraft('mike@example.com', 'Attachment example', 'Please see attached file.', {
    attachments: [file.getAs(MimeType.PDF)],
    name: 'Automatic Emailer Script'
});

// Creates the label @FOO and logs label: FOO
Logger.log("label: " + GmailApp.createLabel("FOO"));

// Have to get the label by name first
var label = GmailApp.getUserLabelByName("FOO");
GmailApp.deleteLabel(label);

// Log the aliases for this Gmail account and send an email as the first one.
var me = Session.getActiveUser().getEmail();
var aliases = GmailApp.getAliases();
Logger.log(aliases);
if (aliases.length > 0) {
  GmailApp.sendEmail(me, 'From an alias', 'A message from an alias!', {'from': aliases[0]});
} else {
  GmailApp.sendEmail(me, 'No aliases found', 'You have no aliases.');
}

// Get the first draft message in your drafts folder
var draft = GmailApp.getDrafts()[0];
// Get its ID
var draftId = draft.getId();
// Now fetch the same draft using that ID.
var draftById = GmailApp.getDraft(draftId);
// Should always log true as they should be the same message
Logger.log(draft.getMessage().getSubject() == draftById.getMessage().getSubject());

// Logs the number of draft messages
var drafts = GmailApp.getDraftMessages();
Logger.log(drafts.length);

var drafts = GmailApp.getDrafts();
for (var i = 0; i < drafts.length; i++) {
  Logger.log(drafts[i].getId());
}

// Log the subject lines of your Inbox
var threads = GmailApp.getInboxThreads();
for (var i = 0; i < threads.length; i++) {
  Logger.log(threads[i].getFirstMessageSubject());
}

// Log the subject lines of up to the first 50 emails in your Inbox
var threads = GmailApp.getInboxThreads(0, 50);
for (var i = 0; i < threads.length; i++) {
  Logger.log(threads[i].getFirstMessageSubject());
}

Logger.log("Messages unread in inbox: " + GmailApp.getInboxUnreadCount());

// Get the first message in the first thread of your inbox
var message = GmailApp.getInboxThreads(0, 1)[0].getMessages()[0];
// Get its ID
var messageId = message.getId();
// Now fetch the same message using that ID.
var messageById = GmailApp.getMessageById(messageId);
// Should always log true as they should be the same message
Logger.log(message.getSubject() == messageById.getSubject());

// Log all the subject lines in the first thread of your inbox
var thread = GmailApp.getInboxThreads(0, 1)[0];
var messages = GmailApp.getMessagesForThread(thread);
for (var i = 0 ; i < messages.length; i++) {
  Logger.log("subject: " + messages[i].getSubject());
}

// Log the subject lines of all messages in the first two threads of your inbox
var thread = GmailApp.getInboxThreads(0, 2);
var messages = GmailApp.getMessagesForThreads(thread);
for (var i = 0 ; i < messages.length; i++) {
  for (var j = 0; j < messages[i].length; j++) {
    Logger.log("subject: " + messages[i][j].getSubject());
  }
}

Logger.log("# of messages in your Priority Inbox: " +
           GmailApp.getPriorityInboxThreads().length);

// Will log some number 2 or less
Logger.log("# of messages in your Priority Inbox: " +
           GmailApp.getPriorityInboxThreads(0, 2).length);

Logger.log("Number of unread emails in your Priority Inbox : " +
           GmailApp.getPriorityInboxUnreadCount());

Logger.log("# of total spam threads: " + GmailApp.getSpamThreads().length);

// Will log a number at most 5
Logger.log("# of total spam threads: " + GmailApp.getSpamThreads(0, 5).length);

// Unless you actually read stuff in your spam folder, this should be the same as
// the number of messages in your spam folder.
Logger.log("# unread threads that are spam: " + GmailApp.getSpamUnreadCount());

// Logs the number of starred threads
Logger.log("# Starred threads: " + GmailApp.getStarredThreads().length);

// Logs the number of starred threads to a maximum of 5
Logger.log("# Starred threads: " + GmailApp.getStarredThreads(0, 5).length);

Logger.log("# unread and starred: " + GmailApp.getStarredUnreadCount());

// Gets the first inbox thread.
const firstThread = GmailApp.getInboxThreads(0,1)[0];
// Gets the same thread by ID.
const threadById = GmailApp.getThreadById(firstThread.getId());
// Verifies that they are the same.
console.log(firstThread.getFirstMessageSubject() === threadById.getFirstMessageSubject());

Logger.log("# of total trash threads: " + GmailApp.getTrashThreads().length);

// Will log a number at most 5
Logger.log("# of total trash threads: " + GmailApp.getTrashThreads(0, 5).length);

var labelObject = GmailApp.getUserLabelByName("myLabel");

// Logs all of the names of your labels
var labels = GmailApp.getUserLabels();
for (var i = 0; i < labels.length; i++) {
  Logger.log("label: " + labels[i].getName());
}

// Mark the first message in the first thread of your inbox as read
var message = GmailApp.getInboxThreads(0, 1)[0].getMessages()[0];
GmailApp.markMessageRead(message);

// Mark the first message in the first thread of your inbox as unread
var message = GmailApp.getInboxThreads(0, 1)[0].getMessages()[0];
GmailApp.markMessageUnread(message);

// Mark first three messages in the first inbox thread as read.
// Assumes that the first inbox thread has 3 messages in it.
var threadMessages = GmailApp.getInboxThreads(0, 1)[0].getMessages();
var messages = [threadMessages[0], threadMessages[1], threadMessages[2]];
GmailApp.markMessagesRead(thread.getMessages());

// Mark first three messages in the first inbox thread as unread.
// Assumes that the first inbox thread has 3 messages in it
var threadMessages = GmailApp.getInboxThreads(0, 1)[0].getMessages();
var messages = [threadMessages[0], threadMessages[1], threadMessages[2]];
GmailApp.markMessagesUnread(thread.getMessages());

// Marks first inbox thread as important
var thread = GmailApp.getInboxThreads(0, 1)[0];
GmailApp.markThreadImportant(thread);

// Marks first inbox thread as read
var thread = GmailApp.getInboxThreads(0, 1)[0];
GmailApp.markThreadRead(thread);

// Marks first inbox thread as unimportant
var thread = GmailApp.getInboxThreads(0, 1)[0];
GmailApp.markThreadUnimportant(thread);

// Marks first inbox thread as unread
var thread = GmailApp.getInboxThreads(0, 1)[0];
GmailApp.markThreadUnread(thread);

// Marks first two threads in inbox as important
var threads = GmailApp.getInboxThreads(0, 2);
GmailApp.markThreadsImportant(threads);

// Marks first two threads in inbox as read
var threads = GmailApp.getInboxThreads(0, 2);
GmailApp.markThreadsRead(threads);

// Marks first two threads in inbox as unimportant
var threads = GmailApp.getInboxThreads(0, 2);
GmailApp.markThreadsUnimportant(threads);

// Marks first two threads in inbox as unread
var threads = GmailApp.getInboxThreads(0, 2);
GmailApp.markThreadsUnread(threads);

// Move the first message in your inbox to trash
var firstThread = GmailApp.getInboxThreads(0,1)[0];
var firstMessage = firstThread.getMessages()[0];
GmailApp.moveMessageToTrash(firstMessage);

// Move first two messages in your inbox to trash
var firstThread = GmailApp.getInboxThreads(0,1)[0];
var messages = firstThread.getMessages();
var toDelete = [messages[0], messages[1]];
GmailApp.moveMessagesToTrash(toDelete);

// Archive the first thread in your inbox
var firstThread = GmailApp.getInboxThreads(0,1)[0];
GmailApp.moveThreadToArchive(firstThread);

// Find a thread not already in your inbox
var thread = GmailApp.search("-in:inbox")[0]; // Get the first one
GmailApp.moveThreadToInbox(thread);

// Tag first thread in inbox as spam
var firstThread = GmailApp.getInboxThreads(0,1)[0];
GmailApp.moveThreadToSpam(firstThread);

// Move first thread in inbox to trash
var firstThread = GmailApp.getInboxThreads(0,1)[0];
GmailApp.moveThreadToTrash(firstThread);

// Move first two threads in your inbox to the archive
var firstTwoThreads = GmailApp.getInboxThreads(0,2);
GmailApp.moveThreadsToArchive(firstTwoThreads);

// Find two threads not already in your inbox
var firstTwoThreads = GmailApp.search("-in:inbox", 0, 2);
GmailApp.moveThreadsToInbox(firstTwoThreads);

// Move first two threads in your inbox to spam
var firstTwoThreads = GmailApp.getInboxThreads(0,2);
GmailApp.moveThreadsToSpam(firstTwoThreads);

// Move first two threads in your inbox to trash
var firstTwoThreads = GmailApp.getInboxThreads(0,2);
GmailApp.moveThreadsToTrash(firstTwoThreads);

var firstThread = GmailApp.getInboxThreads(0,1)[0];
var firstMessage = firstThread.getMessages()[0];
// ...Do something that may take a while here....
GmailApp.refreshMessage(firstMessage);
// ...Do more stuff with firstMessage...

var firstThread = GmailApp.getInboxThreads(0,1)[0];
var coupleOfMessages = firstThread.getMessages().slice(0, 2);
// ...Do something that may take a while here....
GmailApp.refreshMessages(coupleOfMessages);
// ...Do more stuff with coupleOfMessages...

var firstThread = GmailApp.getInboxThreads(0,1)[0];
// ...Do something that may take a while here....
GmailApp.refreshThread(firstThread);
// ... Do more stuff with the thread ...

var threads = GmailApp.getInboxThreads(0, 3);
// ...Do something that may take a while here....
GmailApp.refreshThreads(threads);
// ... Do more stuff with threads ...

// Find starred messages with subject IMPORTANT
var threads = GmailApp.search('is:starred subject:"IMPORTANT"');

// Find starred messages with subject IMPORTANT and return second batch of 10.
// Assumes there are at least 11 of them, otherwise this will return an empty array.
var threads = GmailApp.search('is:starred subject:"IMPORTANT"', 10, 10);

// The code below will send an email with the current date and time.
var now = new Date();
GmailApp.sendEmail("mike@example.com", "current time", "The time is: " + now.toString());

// Send an email with a file from Google Drive attached as a PDF.
var file = DriveApp.getFileById('1234567890abcdefghijklmnopqrstuvwxyz');
GmailApp.sendEmail('mike@example.com', 'Attachment example', 'Please see the attached file.', {
    attachments: [file.getAs(MimeType.PDF)],
    name: 'Automatic Emailer Script'
});

function handleAddonActionEvent(e) {
  var accessToken = e.messageMetadata.accessToken;
  var messageId = e.messageMetadata.messageId;
  GmailApp.setCurrentMessageAccessToken(accessToken);
  var mailMessage = GmailApp.getMessageById(messageId);
  // Do something with mailMessage
}

// Stars the first message in the first thread in your inbox
var firstThread = GmailApp.getInboxThreads(0,1)[0];
var message = firstThread.getMessages()[0];
GmailApp.starMessage(message);

// Stars the first three messages in the first thread in your inbox
var firstThread = GmailApp.getInboxThreads(0,1)[0];
var coupleOfMessages = firstThread.getMessages().slice(0, 3);
GmailApp.starMessages(coupleOfMessages);

// Unstars the first message in the first thread in your inbox
var firstThread = GmailApp.getInboxThreads(0,1)[0];
var message = firstThread.getMessages()[0];
GmailApp.unstarMessage(message);

// Unstars the first three messages in the first thread in your inbox
var firstThread = GmailApp.getInboxThreads(0,1)[0];
var coupleOfMessages = firstThread.getMessages().slice(0, 3);
GmailApp.unstarMessages(coupleOfMessages);