trigger UpdateOpportunityContacts on Opportunity (after insert, before update) {


	for(Opportunity opp: Trigger.new){

		List<Id> contactIds = new List<Id>();

		for(OpportunityContactRole oppContactId : [SELECT ContactId FROM OpportunityContactRole WHERE OpportunityId =:opp.Id]){
    		contactIds.add(oppContactId.id);
    	}

    	if(contactIds.size()>0){

			List<Contact> contacts = new List<Contact>();
			for(Id contactId: contactIds ){
				Contact contact = [SELECT Outreach_Status__c FROM Contact WHERE id =:contactId];
				if(contact != null){
					contacts.add(contact);
				}
			}
			List<Contact> updatedContacts = new List<Contact>();

			for(Contact contact: Contacts){
				if(opp.StageName == 'Closed Won'){
					//move the contacts outreach status to either closed won or lost
					contact.Outreach_Status__c = 'Client';
				}
				else if (opp.StageName == 'Closed Lost'){
					contact.Outreach_Status__c = 'Closed Lost';
				}
				else {
					contact.Outreach_Status__c = 'Opportunity';
				}
				updatedContacts.add(contact);
			}
			insert updatedContacts;
		}

	}
}

@isTest
private class UpdateOpportunityContactsTest {
	
	@isTest static void test_method_one() {
		// Create New Opp
		Opportunity opp = new Opportunity();
		opp.name = 'Test';
		opp.accountId = '0010v00000KYsWoAAL';
		opp.stageName = 'Demo Completed - DM';
		opp.CloseDate = date.newinstance(2019, 3, 10);
		opp.Role_Persona__c = '-';
		opp.ERP_Sofware__c = 'Microsoft Dynamics';
		opp.Existing_Systems__c = '-';
		opp.DM_Involvement_in_Purchasing__c = '-';
		opp.NextStep = '-';

		insert opp;

		// Create New Account
		Account a = new Account();
		a.name = 'Test';
		a.industry = 'Accounting';
		a.of_Locations__c = 10;


		// create new contact
		Contact con = new Contact();
		con.lastName = 'Test';
		con.accountId = a.id;
		con.title = 'Test';
		con.email = 'test@test.com';

		insert con;


		//Create oppcontactrole
		OpportunityContactRole oppContactRole = new OpportunityContactRole();
		oppcontactRole.OpportunityId = opp.id;
		oppContactRole.ContactId = con.id;
		oppContactRole.isPrimary = true;

		insert oppcontactRole;


		opp.stageName = 'Piloting';

		update opp;

		system.debug(con.Outreach_Status__c);
	}
	
	
}