package org.oliot.epcis.service.capture.secured;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Base64;

import javax.servlet.ServletContext;

import org.oliot.epcis.configuration.Configuration;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.context.ServletContextAware;

/**
 * Copyright (C) 2014-2016 Jaewook Byun
 *
 * This project is part of Oliot open source (http://oliot.org). Oliot EPCIS
 * v1.2.x is Java Web Service complying with Electronic Product Code Information
 * Service (EPCIS) v1.2.
 *
 * @author Jaewook Byun, Ph.D student
 * 
 *         Korea Advanced Institute of Science and Technology (KAIST)
 * 
 *         Real-time Embedded System Laboratory(RESL)
 * 
 *         bjw0829@kaist.ac.kr, bjw0829@gmail.com
 */

@Controller
@RequestMapping("/GetClientToken")
public class GetClientToken implements ServletContextAware {

	@Autowired
	ServletContext servletContext;

	@Override
	public void setServletContext(ServletContext servletContext) {
		this.servletContext = servletContext;
	}

	public ResponseEntity<?> asyncPost(String inputString) {
		ResponseEntity<?> result = post(null, null);
		return result;
	}

	@RequestMapping(method = RequestMethod.POST)
	@ResponseBody
	public ResponseEntity<?> post(@RequestParam(required = true) String userID,
			@RequestParam(required = true) String password) {

		/* jaeheeHa0 AC_token reference */
		Configuration.logger.info(" Client Token retrieve");

		String token_string = "";
		String secret = userID + ":" + password;
		String auth_secret = Base64.getEncoder().encodeToString(secret.getBytes());
		String auth = "Basic " + auth_secret;

		StringBuffer response = null;

		try {
			String url = "http://" + Configuration.ac_api_address + "/oauth/token";
			URL obj = new URL(url);
			HttpURLConnection con = (HttpURLConnection) obj.openConnection();

			// add reuqest header
			con.setRequestMethod("POST");
			con.setRequestProperty("Authorization", auth);
			con.setRequestProperty("Content-type", "application/x-www-form-urlencoded");

			String urlParameters = "grant_type=password&username=" + userID + "&password=" + password;

			// Send post request
			con.setDoOutput(true);
			DataOutputStream wr = new DataOutputStream(con.getOutputStream());
			wr.writeBytes(urlParameters);
			wr.flush();
			wr.close();

			int responseCode = con.getResponseCode();
			System.out.println("\nSending 'POST' request to URL : " + url);
			System.out.println("Post parameters : " + urlParameters);
			System.out.println("Response Code : " + responseCode);

			BufferedReader in;
			in = new BufferedReader(new InputStreamReader(con.getInputStream()));

			String inputLine;
			response = new StringBuffer();

			while ((inputLine = in.readLine()) != null) {
				response.append(inputLine);
			}
			in.close();

		} catch (IOException e) {
			e.printStackTrace();
		}

		// print result

		if (response != null) {
			token_string = response.toString();
		}

		Configuration.logger.info(" Token :" + token_string);

		return new ResponseEntity<>(token_string, HttpStatus.OK);
	}

}