public with sharing class Picklist{

	public Map<Id, Account> accountIdRecordMap {get; set;}
	public Status__c login1 {get; set;};
	
	public List<System.SelectOption> accOptions{get;set;}
	public Id selectedAccId {get; set;}
	public List<System.SelectOption> conOptions{get;set;}
	public Id selectedContactId {get; set;}
	
	public Contact selectedContact {get; set;}
	public YourCustomObject__c customObjInstance {get; set;}
	
	//Constructor
	public Picklist(ApexPages.StandardController controller){
		this.login1 = (Status__c)controller.getRecord();
		init();
	} 

	//Retrieve most recent 500 Accounts and associated Contacts
	public Map<Id, Account> getAccountsWithContacts(){
	
		if(this.accountIdRecordMap == null){
			
			this.accountIdRecordMap = [Select Id, Name,
										(
											Select Id,
												   name,
												   accountid,
												   FirstName,
												   LastName,
												   email,
												   MobilePhone,
												   MailingCity,
												   MailingState,
												   MailingCountry 
											From Account.Contacts 
										)
									  From Account
									  Order by CreatedDate DESC
									  Limit 500];
		}
		
		return this.accountIdRecordMap;
	}
	
	//Populate account picklist options
	public void getAccountNames(){
		
		if(this.accOptions.size() == 0){
		
			this.accOptions.add(new System.SelectOption('' , '--Select--'));
		
			for(Id accRecId :accountIdRecordMap.keySet()){
				this.accOptions.add(
					new System.SelectOption(
						accRecId, 
						accountIdRecordMap.get(accRecId).Name
					)
				);
			}//for
		} 
	}
	
	//Populate related Contact picklist options
	public void getContactsByAccountId(Id pAccountId){

		this.conOptions.add(new System.SelectOption('' , '--Select--'));
		if(accountIdRecordMap.keySet().containsKey(pAccountId)){

			for(Contact contactRec :((Account)accountIdRecordMap.get(pAccountId)).Contacts){
			
				this.conOptions.add(
					new System.SelectOption(
						contactRec.Id, 
						contactRec.Name
					)
				);
			}//for
		}
	}
	
	//Retrieves the selectedContact Record information based on the selected Account Id
	public void getSelectedContact(){
	
		if(accountIdRecordMap.keySet().containsKey(pAccountId)){

			for(Contact contactRec :((Account)accountIdRecordMap.get(pAccountId)).Contacts){
				if(contactRec.Id == selectedContactId){
					this.selectedContact = contactRec;
				}
			}
		}//if
	}
	
	//Assumes selectedContact is populated with the Contact record information
	public void populateContactDetails(){
	
		if(this.selectedContact <> null){
	
			this.customObjInstance = new YourCustomObject__c(
				CustomField1__c = this.selectedContact.FirstName,
				CustomField2__c = this.selectedContact.LastName,
				CustomField3__c = this.selectedContact.Email,
				CustomField4__c = this.selectedContact.MobilePhone,
				CustomField5__c = this.selectedContact.MailingCity
				.
				.
				//Add all Contact field mappings here
			);
		}
	}
	
	//Private Methods
	private void init(){
		accOptions = new new List<System.SelectOption>();
		conOptions = new new List<System.SelectOption>();
	}
}