/**
 * 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.web.controller.hl7;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.openmrs.hl7.HL7Source;
import org.openmrs.api.APIException;
import org.openmrs.hl7.HL7Service;
import org.openmrs.api.context.Context;
import org.openmrs.web.WebConstants;
import org.springframework.beans.propertyeditors.CustomNumberEditor;
import org.springframework.dao.DataIntegrityViolationException;
import org.springframework.util.StringUtils;
import org.springframework.validation.BindException;
import org.springframework.web.bind.ServletRequestDataBinder;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.SimpleFormController;
import org.springframework.web.servlet.view.RedirectView;

/**
 * This is the controlling class for hl7SourceForm.jsp page. It initBinder and formBackingObject
 * are called before page load. After submission,The onSubmit function receives the form/command object that was modified by the input form
 * and saves it to the db
 *
 */
public class HL7SourceFormController extends SimpleFormController {
	
	/** Logger for this class and subclasses */
	protected final Log log = LogFactory.getLog(getClass());
	
	/**
	 * Allows for Integers to be used as values in input tags. Normally, only strings and lists are
	 * expected
	 * 
	 * @see org.springframework.web.servlet.mvc.BaseCommandController#initBinder(javax.servlet.http.HttpServletRequest,
	 *      org.springframework.web.bind.ServletRequestDataBinder)
	 */
	protected void initBinder(HttpServletRequest request, ServletRequestDataBinder binder) throws Exception {
		super.initBinder(request, binder);
		//NumberFormat nf = NumberFormat.getInstance(new Locale("en_US"));
		binder.registerCustomEditor(java.lang.Integer.class, new CustomNumberEditor(java.lang.Integer.class, true));
	}
	
	/**
	 * The onSubmit function receives the form/command object that was modified by the input form
	 * and saves it to the db
	 * 
	 * @see org.springframework.web.servlet.mvc.SimpleFormController#onSubmit(javax.servlet.http.HttpServletRequest,
	 *      javax.servlet.http.HttpServletResponse, java.lang.Object,
	 *      org.springframework.validation.BindException)
	 */
	protected ModelAndView onSubmit(HttpServletRequest request, HttpServletResponse response, Object obj,
	        BindException errors) throws Exception {
		
		HttpSession httpSession = request.getSession();
		
		String view = getFormView();
		
		if (Context.isAuthenticated()) {
			HL7Source hl7Source = (HL7Source) obj;
			HL7Service hs = Context.getHL7Service();
			
			if (request.getParameter("save") != null) {
				hs.saveHL7Source(hl7Source);
				view = getSuccessView();
				httpSession.setAttribute(WebConstants.OPENMRS_MSG_ATTR, "HL7Source.saved");
			}

			// if the user is retiring out the HL7Source
			//not implemented yet
			
			// if the user is purging the HL7Source
			else if (request.getParameter("purge") != null) {
				
				try {
					hs.purgeHL7Source(hl7Source);
					httpSession.setAttribute(WebConstants.OPENMRS_MSG_ATTR, "HL7Source.purgedSuccessfully");
					view = getSuccessView();
				}
				catch (DataIntegrityViolationException e) {
					httpSession.setAttribute(WebConstants.OPENMRS_ERROR_ATTR, "error.object.inuse.cannot.purge");
					view = "hl7Source.form?hl7SourceId=" + hl7Source.getHL7SourceId();
				}
				catch (APIException e) {
					httpSession.setAttribute(WebConstants.OPENMRS_ERROR_ATTR, "error.general: " + e.getLocalizedMessage());
					view = "hl7Source.form?hl7SourceId=" + hl7Source.getHL7SourceId();
				}
			}
			
		}
		
		return new ModelAndView(new RedirectView(view));
	}
	
	/**
	 * This is called prior to displaying a form for the first time. It tells Spring the
	 * form/command object to load into the request
	 * 
	 * @see org.springframework.web.servlet.mvc.AbstractFormController#formBackingObject(javax.servlet.http.HttpServletRequest)
	 */
	protected Object formBackingObject(HttpServletRequest request) throws ServletException {
		
		HL7Source hl7Source = null;
		
		if (Context.isAuthenticated()) {
			HL7Service hs = Context.getHL7Service();
			String hl7SourceId = request.getParameter("hl7SourceId");
			if (hl7SourceId != null)
				hl7Source = hs.getHL7Source(Integer.valueOf(hl7SourceId));
		}
		
		if (hl7Source == null)
			hl7Source = new HL7Source();
		
		return hl7Source;
	}
	
}