package com.metaweb.gridworks.commands.info;

import java.io.IOException;
import java.util.Properties;

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

import org.json.JSONException;
import org.json.JSONWriter;

import com.metaweb.gridworks.commands.Command;
import com.metaweb.gridworks.history.HistoryEntry;
import com.metaweb.gridworks.model.Project;

public class GetOperationsCommand extends Command {
	@Override
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		Project project = getProject(request);
		
		try {
	    	response.setCharacterEncoding("UTF-8");
	    	response.setHeader("Content-Type", "application/json");
	    	
	    	Properties options = new Properties();
			JSONWriter writer = new JSONWriter(response.getWriter());
			
			writer.object();
			writer.key("operations"); writer.array();
			
			for (HistoryEntry entry : project.history.getLastPastEntries(-1)) {
				if (entry.operation != null) {
					entry.operation.write(writer, options);
				}
			}
			writer.endArray();
			writer.endObject();
		} catch (JSONException e) {
			respondException(response, e);
		}
	}

}