Sending Google Doc email template as html format on Email - google-apps-script

Question

I've google docs template with logo and some images plus some text instructions, and I want to send it over email exactly how it appear in Google Docs, I know how to send plain text from google docs but can't figure out how to send templates with images.
Here is the code I am using currently :-
var body = doc.getBody().getText();
var message = body;
var subject = "subject line";
MailApp.sendEmail (user.primaryEmail, subject, message)
Updated script as suggested by Tanaike :-
function getDocAsHtml(docId){
var doc = DocumentApp.getActiveDocument()
var url = "https://docs.google.com/feeds/download/documents/export/Export?exportFormat=html&id=" + doc.getId();
var html = UrlFetchApp.fetch(url, { headers: { authorization: "Bearer " + ScriptApp.getOAuthToken() } }).getContentText();
var body = doc.getBody().getText();
var message = body;
var subject = "subject line";
MailApp.sendEmail('abc#xyz.com', subject, message, { htmlBody: html });
}

Answer 1

I believe your goal is as follows.
You want to send an email as the HTML body of the Google Document.
In this case, how about the following modification? From your showing script, I suppose that doc is the object of Document.
Modified script:
var url = "https://docs.google.com/feeds/download/documents/export/Export?exportFormat=html&id=" + doc.getId();
var html = UrlFetchApp.fetch(url, { headers: { authorization: "Bearer " + ScriptApp.getOAuthToken() } }).getContentText();
var body = doc.getBody().getText();
var message = body;
var subject = "subject line";
MailApp.sendEmail(user.primaryEmail, subject, message, { htmlBody: html });
// DriveApp.getFiles(); // This is used for automatically detecting the scope of Drive API.
When this script is run, the Google Document of doc is sent as the HTML body.
Note:
In this case, the mail client cannot show the HTML body, the text body of message is shown.
References:
fetch(url, params)
sendEmail(recipient, subject, body, options)