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package org.nakedobjects.example.expenses.claims;

import java.text.SimpleDateFormat;
import java.util.Date;

import org.nakedobjects.applib.AbstractFactoryAndRepository;
import org.nakedobjects.applib.annotation.Hidden;
import org.nakedobjects.example.expenses.employee.Employee;


/**
 * Contains common logic for creating a new Claim, which may be called from several contexts.
 *
 */
public class ClaimFactory extends AbstractFactoryAndRepository {
	
	
    // {{ Injected Services
    /*
     * This region contains references to the services (Repositories, 
     * Factories or other Services) used by this domain object.  The 
     * references are injected by the application container.
     */
     
	// {{ Injected: ClaimRepository
    private ClaimRepository claimRepository;
    /**
     * This field is not persisted, nor displayed to the user.
     */
    protected ClaimRepository getClaimRepository() {
        return this.claimRepository;
    }
    /**
     * Injected by the application container.
     */
    public void setClaimRepository(ClaimRepository claimRepository) {
        this.claimRepository = claimRepository;
    }
	// }}

    // }}
	
	@Hidden
	 public Claim createNewClaim(final Employee employee, final String description) {
        final Claim claim = (Claim) newTransientInstance(Claim.class);
        claim.setClaimant(employee);
        claim.setApprover(employee.getNormalApprover());
        claim.initialiseTotal();
        claim.setDescription(createUniqueDescription(employee, description));
        makePersistent(claim);
        claim.changeStatusToNew();
        return claim;
    }
	
	    
		public String defaultUniqueClaimDescription(Employee employee) {
			return createUniqueDescription(employee, createDefaultClaimDescription(null)); 
		}
		
	    public String createDefaultClaimDescription(final String inputDescription) {
	        if (inputDescription == null || inputDescription.length() == 0) {
	            return new SimpleDateFormat("dd-MMM-yy").format(new Date());
	        }
	        return inputDescription;
	    }
		
	 
	    private String createUniqueDescription(final Employee employee, final String initialDescription) {
	        int increment = 2;
	        String description = initialDescription;
	        while (!claimRepository.descriptionIsUniqueForClaimant(employee, description)) {
	            description = initialDescription + CLAIM_DIFFERENTIATOR + increment++;
	        }
	        return description;
	    }
	    
	    public static final String CLAIM_DIFFERENTIATOR = " - ";

		
	 	@Hidden
		public ExpenseItem createNewExpenseItem(AbstractClaim claim, ExpenseType type) {
			  try {
		            final ExpenseItem item = newTransientInstance((Class) Class.forName(type.getCorrespondingClassName()));
		            item.setExpenseType(type);
		            item.modifyProjectCode(claim.getProjectCode());
		            item.setClaim(claim);
		            item.initialiseAmount();
		            return item;
		        } catch (ClassNotFoundException e) {
		            throw new RuntimeException(e);
		        }
		}
	 	
	 	@Hidden
	 	public void makePersistent(ExpenseItem transientExpenseItem) {
	 		super.makePersistent(transientExpenseItem);
	 	}

}