package org.openmrs.module.restmodule.web;



import java.io.IOException;

import java.io.PrintWriter;

import java.lang.reflect.Type;

import java.util.Collection;



import javax.servlet.ServletException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;



import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.openmrs.Patient;

import org.openmrs.api.context.Context;

import org.openmrs.module.restmodule.JsonPatient;

import org.openmrs.module.restmodule.RestUtil;

import org.openmrs.module.restmodule.XmlPatient;



import com.google.gson.Gson;

import com.google.gson.GsonBuilder;

import com.google.gson.reflect.TypeToken;



/**

 * Provides a simple RESTful access to patients

 */

public class PatientResource implements RestResource {

	

	private static final long serialVersionUID = -5695748L;

    private Log log = LogFactory.getLog(this.getClass());



	/**

	 * Handle all requests to this resource

	 */

	public void handleRequest(Operation operation, OutputType outputType,

			String restRequest, HttpServletRequest request,

			HttpServletResponse response) throws ServletException, IOException {



		PrintWriter out = response.getWriter();



		switch (operation) {



		case GET:

			Collection<Patient> patientList = Context.getPatientService()

					.getPatientsByIdentifier(restRequest, false);



			printPatientList(out, outputType, patientList);



			break;



		case POST:

		case PUT:

		case DELETE:

			response.sendError(HttpServletResponse.SC_NOT_IMPLEMENTED);

			return;

		}



	}



	/**

	 * Auto generated method comment

	 * 

	 * @param out

	 * @param outputType

	 * @param patientList

	 */

	public static void printPatientList(PrintWriter out, OutputType outputType,

			Collection<Patient> patientList) {

	

		if (outputType == OutputType.XML) {

			out.print("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");

			out.print("<patientList version=\""

					+ RestServlet.PATIENT_LIST_XML_VERSION + "\">");

			int i = 0;

			int max = RestUtil.getMaxResults();

			for (Patient patient : patientList) {

				out.print(XmlPatient.encode(patient));

				i++;

				if (max > 0 && i >= max)

					break; // if max set, abort before exceeding

			}

			out.print("</patientList>");

		} else if (outputType == OutputType.JSON) {

			GsonBuilder gsonBuilder = new GsonBuilder().registerTypeAdapter(Patient.class, new PatientSerializer());

			Gson gson = gsonBuilder.create();

			Type listType = new TypeToken<Collection<Patient>>() {}.getType();

			out.print(gson.toJson(patientList, listType));

//			out.print("[");

//            int i = 0;

//            int max = RestUtil.getMaxResults();

//            for (Patient patient : patientList) {

//                    if (i != 0)

//                            out.print(",");

//                    out.print(JsonPatient.encode(patient));

//                    i++;

//                    if (max > 0 && i >= max)

//                            break; // if max set, abort before exceeding

//            }

//            out.print("]");



		}

	}

}