/**
 * 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.patient;

import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.Map;

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.PatientIdentifierType;
import org.openmrs.api.APIException;
import org.openmrs.api.PatientService;
import org.openmrs.api.context.Context;
import org.openmrs.patient.IdentifierValidator;
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.validation.Errors;
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;

public class PatientIdentifierTypeFormController 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();
		
		ModelAndView toReturn = new ModelAndView(new RedirectView(view));
		
		if (Context.isAuthenticated()) {
			
			PatientIdentifierType identifierType = (PatientIdentifierType) obj;
			PatientService ps = Context.getPatientService();
			
			//to save the patient identifier type
			if (request.getParameter("save") != null) {
				
				identifierType.setCheckDigit(identifierType.hasValidator());
				
				ps.savePatientIdentifierType(identifierType);
				httpSession.setAttribute(WebConstants.OPENMRS_MSG_ATTR, "PatientIdentifierType.saved");
				toReturn = new ModelAndView(new RedirectView(getSuccessView()));
			}

			// if the user is retiring the identifierType
			else if (request.getParameter("retire") != null) {
				String retireReason = request.getParameter("retireReason");
				if (identifierType.getPatientIdentifierTypeId() != null && !(StringUtils.hasText(retireReason))) {
					errors.reject("retireReason", "general.retiredReason.empty");
					return showForm(request, response, errors);
				}
				
				ps.retirePatientIdentifierType(identifierType, retireReason);
				httpSession.setAttribute(WebConstants.OPENMRS_MSG_ATTR, "PatientIdentifierType.retiredSuccessfully");
				
				toReturn = new ModelAndView(new RedirectView(getSuccessView()));
			}

			// if the user is purging the identifierType
			else if (request.getParameter("purge") != null) {
				
				try {
					ps.purgePatientIdentifierType(identifierType);
					httpSession.setAttribute(WebConstants.OPENMRS_MSG_ATTR, "PatientIdentifierType.purgedSuccessfully");
					toReturn = new ModelAndView(new RedirectView(getSuccessView()));
				}
				catch (DataIntegrityViolationException e) {
					httpSession.setAttribute(WebConstants.OPENMRS_ERROR_ATTR, "error.object.inuse.cannot.purge");
					return showForm(request, response, errors);
				}
				catch (APIException e) {
					httpSession.setAttribute(WebConstants.OPENMRS_ERROR_ATTR, "error.general: " + e.getLocalizedMessage());
					return showForm(request, response, errors);
				}
				
			}
			
		}
		
		return toReturn;
	}
	
	/**
	 * 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 {
		
		PatientIdentifierType identifierType = null;
		
		if (Context.isAuthenticated()) {
			PatientService ps = Context.getPatientService();
			String identifierTypeId = request.getParameter("patientIdentifierTypeId");
			if (identifierTypeId != null)
				identifierType = ps.getPatientIdentifierType(Integer.valueOf(identifierTypeId));
		}
		
		if (identifierType == null)
			identifierType = new PatientIdentifierType();
		
		return identifierType;
	}
	
	/**
	 * Called prior to form display. Allows for data to be put in the request to be used in the view
	 * 
	 * @see org.springframework.web.servlet.mvc.SimpleFormController#referenceData(javax.servlet.http.HttpServletRequest)
	 */
	protected Map<String, Object> referenceData(HttpServletRequest request, Object obj, Errors err) throws Exception {
		Map<String, Object> toReturn = new LinkedHashMap<String, Object>();
		
		Collection<IdentifierValidator> pivs = Context.getPatientService().getAllIdentifierValidators();
		
		toReturn.put("patientIdentifierValidators", pivs);
		
		String defaultValidatorName = Context.getPatientService().getDefaultIdentifierValidator().getName();
		
		toReturn.put("defaultValidatorName", defaultValidatorName);
		
		toReturn.put("locationBehaviors", PatientIdentifierType.LocationBehavior.values());
		
		return toReturn;
	}
	
}