package de.mpiwg.indexmeta.web.servlet.methods;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;

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

import org.apache.commons.lang.StringUtils;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import de.mpiwg.indexmeta.bo.Contextualization;
import de.mpiwg.indexmeta.services.DataProvider;
import de.mpiwg.indexmeta.web.utils.JSONUtils;

public class JSONGetCtxFromDB extends AbstractServletMethod {

	public static void execute(DataProvider dp,
			HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException, JSONException {
		
		JSONObject json = new JSONObject();

		long startExecution = System.currentTimeMillis();

		String indexMetaId = getString(request, p_indexMetaId);
		String type = getString(request, p_type);
		String elementId = getString(request, p_elementId);
		String remoteId = getString(request, p_remoteId);

		List<Contextualization> rs = null;

		if (StringUtils.isNotEmpty(indexMetaId)) {

			rs = dp.getCtxByIndexMetaId(indexMetaId);
			rs = filterByType(rs, type);
			rs = filterByElementId(rs, elementId);
			rs = filterByRemoteId(rs, remoteId);

		} else if (StringUtils.isNotEmpty(type)) {

			rs = dp.getCtxByType(type);
			rs = filterByElementId(rs, elementId);
			rs = filterByRemoteId(rs, remoteId);

		} else {
			response.sendError(HttpServletResponse.SC_BAD_REQUEST,
					"Parameters 'indexMetaId' and 'type' are null. "
							+ "At least one of them must be not null.");
			return;
		}

		JSONArray rsArray = new JSONArray();
		for (Contextualization ctx : rs) {
			rsArray.put(JSONUtils.ctx2JSON(ctx));
		}

		json.put("rs", rsArray);
		json.put(RUNTIME, (System.currentTimeMillis() - startExecution));
		
		PrintWriter out = response.getWriter();
		out.print(json.toString());	

	}

}