global without sharing class EmailMessageInsertAction {
  @InvocableMethod(label='Insert Email Message')
  global static void insertEmailMessages(List<InsertEmailMessageActionRequest> requests) {
    for (InsertEmailMessageActionRequest request : requests) {
      insertEmailMessage(request);
    }
  }

  public static void insertEmailMessage(InsertEmailMessageActionRequest request) {
	//get merged template info
	Messaging.SingleEmailMessage emailMsg = Messaging.renderStoredEmailTemplate(request.emailTemplateId, request.toId, request.parentCaseId);
	//create email message
      EmailMessage eMsg = new EmailMessage();
      System.Debug('message');
      eMsg.fromAddress = request.fromEmailAddress;
      eMsg.parentId = request.parentCaseId;
      eMsg.status = '3';
      eMsg.subject = emailMsg.getSubject();
      eMsg.textBody = emailMsg.getPlainTextBody();
      eMsg.htmlBody = emailMsg.getHTMLBody();
      eMsg.ToAddress = request.toEmailAddress;

	//insert email message
      insert eMsg;
  }

  global class InsertEmailMessageActionRequest {
    @InvocableVariable(required=true)
    global ID parentCaseId;

    @InvocableVariable(required=true)
    global String emailTemplateId;
      
    @InvocableVariable(required=true)
    global String fromEmailAddress;
      
    @InvocableVariable(required=true)
    global String toEmailAddress;
      
	@InvocableVariable//(required=true)
    global String toId;
  }
}

@isTest
public class EmailInsertActionTest {
    static testMethod void doTest() {
        
        User thisUser = [ select Id from User where Id =: UserInfo.getUserId()];
        System.runAs(thisUser) {
            EmailTemplate testEmailTemplate = new EmailTemplate(IsActive=TRUE,
                                                               Encoding='ISO-8859-1',
                                                               FolderId=UserInfo.getUserId(), //running user's personal folder
                                                               Name='Test Email Template',
                                                               DeveloperName='Test_Email_Template',
                                                               Subject='Test Email Template Subject',
                                                               Body='Test Email Template Body',
                                                               TemplateType='Text');
            insert testEmailTemplate;
    	}
        
        Test.startTest();
        
        Account testGPSPartner = new Account(Name='Test GPS Partner',
                                             Active__c=TRUE,
                                            Industry='Retailer');
        insert testGPSPartner;
        
        Contact testTech = new Contact(FirstName = 'Test',
                                  LastName = 'Tech',
                                  MailingPostalCode='49512');
        insert testTech;
        
        Contact testConsumer = new Contact(FirstName='Test',
                                          LastName='Consumer',
                                          MailingPostalCode='48838');
        insert testConsumer;
        
        Case testCase = new Case(Subject='Test Subject',
                                Account=testGPSPartner);
        insert testCase;
        
        EmailTemplate testEmailTemplate = [SELECT IsActive, Encoding, FolderId, Name, DeveloperName, Subject, Body, TemplateType FROM EmailTemplate WHERE DeveloperName = 'Test_Email_Template'];
        
        EmailMessageInsertAction.InsertEmailMessageActionRequest iemar = new EmailMessageInsertAction.InsertEmailMessageActionRequest();
        iemar.parentCaseId=testCase.Id;
        iemar.emailTemplateId=testEmailTemplate.Id;
        iemar.fromEmailAddress='from@email.address';
        iemar.toEmailaddress='to@email.address';
        
        //EmailMessageInsertAction.InsertEmailMessageActionRequest iemar = new EmailMessageInsertAction.InsertEmailMessageActionRequest();
            
        EmailMessageInsertAction.insertEmailMessages(New EmailMessageInsertAction.InsertEmailMessageActionRequest[]{iemar});
        
        Test.stopTest();
        
        EmailMessage resultantEmailMessage = [SELECT ParentId, Subject, TextBody, FromAddress, ToAddress, Status FROM EmailMessage WHERE ParentId =: testCase.Id];

        System.assertEquals(resultantEmailMessage.ParentId, testCase.Id);
        System.assertEquals(resultantEmailMessage.Subject, testEmailTemplate.Subject);
        System.assertEquals(resultantEmailMessage.TextBody, testEmailTemplate.Body);
        System.assertEquals(resultantEmailMessage.FromAddress, iemar.fromEmailAddress);
        System.assertEquals(resultantEmailMessage.ToAddress, iemar.toEmailaddress);
        System.assertEquals(resultantEmailMessage.Status, '3');
        //System.assertEquals(resultantEmailMessage.Incoming, FALSE);
    }
}