/**
 * The contents of this file are subject to the OpenMRS Public License
 * Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://license.openmrs.org
 *
 * Software distributed under the License is distributed on an "AS IS"
 * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
 * License for the specific language governing rights and limitations
 * under the License.
 *
 * Copyright (C) OpenMRS, LLC.  All Rights Reserved.
 */
package org.openmrs.validator;

import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.openmrs.Program;
import org.openmrs.api.context.Context;
import org.springframework.validation.Errors;
import org.springframework.validation.ValidationUtils;
import org.springframework.validation.Validator;

/**
 * Validates attributes on the {@link Program} object.
 * 
 * @since 1.5
 */
public class ProgramValidator implements Validator {
	
	protected final Log log = LogFactory.getLog(getClass());
	
	/**
	 * Determines if the command object being submitted is a valid type
	 * 
	 * @see org.springframework.validation.Validator#supports(java.lang.Class)
	 */
	@SuppressWarnings("unchecked")
	public boolean supports(Class c) {
		return c.equals(Program.class);
	}
	
	/**
	 * Checks the form object for any inconsistencies/errors
	 * 
	 * @see org.springframework.validation.Validator#validate(java.lang.Object,
	 *      org.springframework.validation.Errors)
	 * @should fail validation if name is null or empty or whitespace
	 * @should fail validation if program name already in use
	 * @should fail validation if concept is null or empty or whitespace
	 * @should pass validation if all required fields have proper values
	 */
	public void validate(Object obj, Errors errors) {
		Program p = (Program) obj;
		if (p == null) {
			errors.rejectValue("program", "error.general");
		} else {
			ValidationUtils.rejectIfEmptyOrWhitespace(errors, "name", "error.name");
			List<Program> programs = Context.getProgramWorkflowService().getAllPrograms(false);
			for (Program program : programs) {
				if (program.getName().equals(p.getName()) && !program.getProgramId().equals(p.getProgramId())) {
					errors.rejectValue("name", "general.error.nameAlreadyInUse");
					break;
				}
			}
			
			ValidationUtils.rejectIfEmptyOrWhitespace(errors, "concept", "error.concept");
		}
	}
}