package eu.dnetlib.server;

import eu.dnetlib.client.GoldOAPortal;
import eu.dnetlib.goldoa.domain.*;
import eu.dnetlib.goldoa.service.RequestManager;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.io.IOUtils;
import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

/**
 * Created by antleb on 7/9/15.
 */
public class RequestServlet extends HttpServlet {
	private RequestManager requestManager;

	@Override
	public void init(ServletConfig config) throws ServletException {

		super.init(config);

		ApplicationContext context = WebApplicationContextUtils
				.getWebApplicationContext(getServletContext());

		this.requestManager = (RequestManager) context.getBean("requestManager");
	}

	@Override
	public void doPost(HttpServletRequest request, HttpServletResponse response)  throws ServletException, IOException {
		try {
			FileItemFactory factory = new DiskFileItemFactory();
			ServletFileUpload upload = new ServletFileUpload(factory);
			List<FileItem> items = upload.parseRequest(request);

			String requestId = null;
			float apcPaid = 0;
			float transferCost = 0;
			float otherCost = 0;
			Date datePaid = null;
			String comment = null;
            String email = null;

            String action = null;

			for (FileItem item:items) {
				if (item.isFormField()) {
					String fieldName = item.getFieldName();
					String value = item.getString();


					if (fieldName.equals("apcPaid") && value != null && !value.equals("")) {
						apcPaid = Float.parseFloat(value);
					} else if (fieldName.equals("transferCosts") && value != null && !value.equals("")) {
						transferCost = Float.parseFloat(value);
					} else if (fieldName.equals("otherExpenses") && value != null && !value.equals("")) {
						otherCost = Float.parseFloat(value);
					} else if (fieldName.equals("comment") && value!=null && !value.trim().equals("")) {
						comment = value;
                    } else if (fieldName.equals("email") && value!=null && !value.trim().equals("")) {
                        email = value;
					} else if (fieldName.equals("requestId")) {
						requestId = value;
					} else if (fieldName.equals("dateOfTransfer")) {
						datePaid = new SimpleDateFormat("yyyy/MM/dd").parse(value);
					} else if (fieldName.equals("action")) {
                        action = value;
                    }
				}
			}

            if(action!=null && action.equals("edit")) {
                Request savedRequest = requestManager.getById(requestId);
                if(savedRequest!=null) {
					savedRequest.setApcPaid(apcPaid);
					savedRequest.setTransferCost(transferCost);
					savedRequest.setOtherCost(otherCost);
					savedRequest.setDatePaid(new Timestamp(datePaid.getTime()));
					requestManager.saveRequest(savedRequest);
                }

            } else {
                requestManager.paidRequest(requestId, email, comment, null, apcPaid, transferCost, otherCost, datePaid);
            }

			for (FileItem item:items) {
				if (!item.isFormField()) {
					String contentType = item.getContentType();
					requestManager.uploadTransferReceipt(requestId, contentType, item.getInputStream());
				}
			}

			response.setStatus(200);
		}
		catch(Exception e){
			throw new RuntimeException(e);
		}
	}

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		String requestId = req.getParameter("requestId");

		try {
			BankTransferReceipt file = requestManager.downloadBankTransferReceipt(requestId);

			resp.setContentType(file.getContentType());
			resp.setContentLength(file.getContent().length);

			IOUtils.copy(new ByteArrayInputStream(file.getContent()), resp.getOutputStream());
		} catch (RequestManagerException e) {

			switch (e.getErrorCause()) {
				case NOT_EXISTS:
					resp.setStatus(404);
					resp.getOutputStream().println("Bank transfer receipt for request " + requestId + " not found");
					break;
				case UNKNOWN:
				default:
					resp.setStatus(500);
					resp.getOutputStream().println("Error getting transfer receipt for request " + requestId);
					break;
			}
		}
	}
}