Controller

import java.util.*;
import java.io.*;


public class Controller implements IController {

	private IService service;
	private IResponse response;


	public Controller() {
		this.service = null;
		this.response = null;
	}

	public IService getService() {
		return this.service;
	}

	public void setService(IService service) {
		this.service = service;
	}

	public IResponse getResponse() {
		return this.response;
	}

	public void setResponse(IResponse response) {
		this.response = response;
	}


	/*
	 *
	 * */
	public IResponse getStudent(Student student) {
		int respCode = 0;
		String respMsg = "";
		if(student.equals(service.getStudent(student))) {
			respCode = 200;
			respMsg = "OK";
			response.setContent(student);
		}
		else if(!student.equals(service.getStudent(student))) {
			respCode = 404;
			respMsg = "NOT_FOUND";
		}
		else if(student.getPID() == null) {
			respCode = 400;
			respMsg = "BAD_REQUEST";
		}
		else {
			respCode = 400;
			respMsg = "BAD_REQUEST";
		}
		response.setResponseCode(respCode);
		response.setResponseString(respMsg);
		return response;
	}


	/*
	 *
	 * */
	public IResponse addStudent(Student student) {
		int respCode = 0;
		String respMsg = "";
		if(getStudent(student).getContent() == student) {
			service.updateStudent(student);
			respCode = 202;
			respMsg = "ACCEPTED";
		}
		else if(!(getStudent(student).getContent() == student)) {
			service.addStudent(student);
			respCode = 201;
			respMsg = "CREATED";
		}
		else if(student.getName() != null && student.getEmail() != null) {
			service.addStudent(student);
			respCode = 201;
			respMsg = "CREATED";
		}
		else {
			respCode = 400;
			respMsg = "BAD_REQUEST";
		}

		response.setResponseCode(respCode);
		response.setResponseString(respMsg);
		return response;
	}


	/*
	 *
	 * */
	public IResponse removeStudent(Student student) {
		int respCode = 0;
		String respMsg = "";
		if(getStudent(student).getContent() == student) {
			service.removeStudent(student);
			respCode = 200;
			respMsg = "OK";
		}
		else if(!(getStudent(student).getContent() == student)) {
			respCode = 200;
			respMsg = "OK";
		}
		else {
			respCode = 400;
			respMsg = "BAD_REQUEST";
		}

		response.setResponseCode(respCode);
		response.setResponseString(respMsg);
		return response;
	}


	/*
	 *
	 * */
	public IResponse updateStudent(Student student) {
		int respCode = 0;
		String respMsg = "";
		if(service.updateStudent(student)) {
			respCode = 200;
			respMsg = "OK";
		}
		else if(service.getStudent(student) == null) {
			respCode = 404;
			respMsg = "NOT_FOUND";
		}
		else {
			respCode = 400;
			respMsg = "BAD_REQUEST";
		}

		response.setResponseCode(respCode);
		response.setResponseString(respMsg);
		return response;
	}


	/*
	 *
	 * */
	public IResponse getAllStudent() {
		int respCode = 0;
		String respMsg = "";
		if(!service.getAllStudent().isEmpty()) {
			respCode = 200;
			respMsg = "OK";
			response.setListContent(service.getAllStudent());
		}
		else {
			respCode = 404;
			respMsg = "NOT_FOUND";
			ArrayList<Student> newList = new ArrayList<Student>(0);
			response.setListContent(newList);
		}

		response.setResponseCode(respCode);
		response.setResponseString(respMsg);
		return response;
	}

	public static void main(String[] args) {
		Controller C = new Controller();
		Service S = new Service();
		Database D = new  Database();
		IResponse R = new StudentResponseObj();

	}

}