#! /usr/bin/env groovy

/**
 *  A program that takes as input two files, a mail template and a csv file with a list of people to
 *  send a mail to.  The csv file is formatted:
 *
 *      companyname,jobtitle,firstname,lastname,phonenumber,emailaddress
 *
 *  and the mail template can use markers such as <%= firstname %> which will get edited with information from
 *  the current person being mailshotted.  Basically this is a standard mail merge type thing but it actually
 *  send email rather than creates postal letters.
 *
 *  @author Russel Winder
 *  @version 0.1.1
 *  @date 2007-02-08
 *  @copyright Copyright © 2004-7 Russel Winder.  All rights reserved.
 */

import groovy.text.SimpleTemplateEngine

def transform ( toData ) {
  def data = toData.split ( ',' )
  def definitions = [
                 companyname : data[0] ,
                 jobtitle : data[1] ,
                 firstname : data[2] ,
                 lastname : data[3] , 
                 phonenumber : data[4] ,
                 emailaddress : data[5] 
                 ]
  def engine = new SimpleTemplateEngine ( ).createTemplate ( emailTemplate )
  [ definitions[ 'emailaddress' ] , engine.make ( definitions ).toString ( ) ]
}

def process ( toData ) {
  def data = transform ( toData )
  new AntBuilder ( ).mail ( mailhost : 'mail.russel.org.uk', subject : emailSubjectLine ) {
      from ( address :  fromAddress )
      to  ( address : data[0] )
      message ( data[1] )
  }
}

fromAddress = 'russel@russel.org.uk'
if ( args.size ( ) != 3 ) {
  println( 'Usage: mailshot.py <mail-subject-line> <mail-template> <targets-csv-file>' )
  return 1
}
emailSubjectLine = args[0]
emailTemplate = new File ( args[1] ) .text
new File ( args[2] ).eachLine { line -> process ( line ) }