//The trigger adds a set of default products to an opportunity as soon as it gets created. 
//code can be modifed to have different set of products for different conditions, e.g. record-types or owners 

trigger AddProductsToOpportunity on Opportunity (after insert) {
	
	String priceBookName = 'Standard'; 
	List<String> productCodeList = new List<String>(); 
	
	Map<String, List<String>> rTypeProductCodesMap = new Map<String, List<String>>(); 
	//add your record-types and product codes here. 
		
	rTypeProductCodesMap.put('RecordTypeID_1', new List<String>{'Code1','Code2','Code3'});
	rTypeProductCodesMap.put('RecordTypeID_2', new List<String>{'Code4','Code5','Code6'});
	rTypeProductCodesMap.put('RecordTypeID_3', new List<String>{'Code7','Code8','Code9','Code10'});
	
	// Logic
	//get all PriceBookEntry, and keep them in a map
	//based on record-type, take out pricebook entries. 
	for(String s:  rTypeProductCodesMap.keySet()){
		productCodeList.addAll(rTypeProductCodesMap.get(s)); 
	}
	List<PricebookEntry> pbeList = [Select Product2.ProductCode, UnitPrice, Product2Id, priceBook2Id From PricebookEntry  where Product2.ProductCode in :productCodeList and Pricebook2.Name = :priceBookName ]; 
	Map<String, PricebookEntry> codePbeMap = new Map<String, PricebookEntry>(); 
	for(PricebookEntry pbe: pbeList){
		if(pbe.Product2.ProductCode !=null && pbe.Product2.ProductCode.length()>0  ){
			codePbeMap.put(pbe.Product2.ProductCode, pbe); 
		}
	}
	//loop through opportunities and add appropriate PriceBook Entries 
	
	if(pbeList.size() > 0 ){
		ID priceBookID = pbeList[0].priceBook2Id; 
		List<OpportunityLineItem> oliList = new List<OpportunityLineItem>(); 		
		for(Opportunity o: trigger.new){
			//if recordtype ID is in the list above 
			if(rTypeProductCodesMap.containsKey(o.RecordTypeID)){
				//Loop on product codes  
				for(String code1 :rTypeProductCodesMap.get(o.RecordTypeID ) ){
					//get pbe entry and create an OLI entry 
					if(codePbeMap.containsKey(code1)){
						OpportunityLineItem oli = new OpportunityLineItem(); 
						oli.OpportunityId = o.id; 
						oli.PricebookEntryId = codePbeMap.get(code1).id; 
						oli.Quantity = 1; 
						oli.UnitPrice = codePbeMap.get(code1).UnitPrice; 
						oliList.add(oli); 
					}
				}
				
			}
		}
		insert oliList; 
	}//	if(pbeList.size() > 0 )

}