package ch.heigvd.cld.lab;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.logging.Logger;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.google.appengine.api.datastore.DatastoreService;
import com.google.appengine.api.datastore.DatastoreServiceFactory;
import com.google.appengine.api.datastore.Entity;


@SuppressWarnings("serial")
public class DatastoreWriteServlet extends HttpServlet{
	
	private static Logger LOG = Logger.getLogger(DatastoreWriteServlet.class.getSimpleName());
	
	@Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
                         throws ServletException, IOException {
		
		Map<String, String[]> params = req.getParameterMap();
		
		Map<String, String> values = new HashMap<>();
		String kind = null;
		String key = null;
		
		for (Map.Entry<String, String[]> entry : params.entrySet()) {
			String name = entry.getKey();
			String value = entry.getValue()[0];
			
			switch(name) {
			case "_kind":
				kind = value;
				break;
			case "_key":
				key = value;
				break;
			default:
				values.put(name, value);
				break;
			}
		}
		
        resp.setContentType("text/plain");
        PrintWriter pw = resp.getWriter();
        
        if (kind == null) {
        	pw.println("Requires '_kind' parameter");
        	return;
        } else {
        	pw.println("Writing entity to datastore.");
        }
		
        DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
        Entity book = null;
        if (key != null) {
        	book = new Entity(kind, key);
        } else {
        	book = new Entity(kind);
        }
        
        for (Map.Entry<String, String> pair : values.entrySet()) {
        	book.setProperty(pair.getKey(), pair.getValue());
        }
        datastore.put(book);
    }
}