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package in.shop2020.web;
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package in.shop2020.web;
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import in.shop2020.model.ComparisonStats;
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import in.shop2020.server.ComparisonStatsRepository;
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import java.io.IOException;
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import java.io.IOException;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import java.util.Date;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import javax.servlet.http.HttpServletResponse;
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import org.json.JSONObject;
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import com.google.appengine.api.datastore.DatastoreService;
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import com.google.appengine.api.datastore.DatastoreServiceFactory;
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import com.google.appengine.api.datastore.Entity;
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import com.google.appengine.api.datastore.PreparedQuery;
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import com.google.appengine.api.datastore.Query;
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public class ShowCompareProducts extends HttpServlet {
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public class ShowCompareProducts extends HttpServlet {
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    private static final long serialVersionUID = -8236918415987438049L;
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    private static final long serialVersionUID = -8236918415987438049L;
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    public void doPost(HttpServletRequest req, HttpServletResponse resp) {
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    public void doPost(HttpServletRequest req, HttpServletResponse resp) {
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        resp.setContentType("application/json");
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        resp.setContentType("application/json");
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        DatastoreService datastore = DatastoreServiceFactory
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                .getDatastoreService();
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        String fromDateString = req.getParameter("fromdate");
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        String toDateString = req.getParameter("todate");
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        Date fromDate = new Date(0);
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        Date toDate =  new Date();
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        try{
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	        if(fromDateString!=null){
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	        	fromDate = new Date(Long.parseLong(fromDateString));
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	        }
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	        if(toDateString!=null){
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	        	toDate = new Date(Long.parseLong(toDateString));
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	        }
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        }catch (Exception e) {
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    		System.out.println("Parse exception, using default date from 1970 to Today");
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		}
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        Query q = new Query("DataLog");
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        q.addFilter("eventType", Query.FilterOperator.EQUAL, "PRODUCT_COMPARE");
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        q.addFilter("date", Query.FilterOperator.GREATER_THAN_OR_EQUAL, fromDate);
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        q.addFilter("date", Query.FilterOperator.LESS_THAN_OR_EQUAL, toDate);
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        PreparedQuery pq = datastore.prepare(q);
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        Map<Long, Map<Long, Long>> comparisonStats = new HashMap<Long, Map<Long, Long>>();
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        try {
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        try {
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            for (Entity result : pq.asIterable()) {
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            	List<Long> itemIds;
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            	try{
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            		itemIds =  (List<Long>) result.getProperty("itemIds");
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            	}catch (ClassCastException ce) {
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					System.out.println("Unable to cast itemIds to List");
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					continue;
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				}
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                if(itemIds != null && !itemIds.isEmpty()){
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                	for(int i=0; i<itemIds.size(); i++){
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                		for(int j=0; j<i; j++){
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                			Long itemOne = itemIds.get(i);
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                			Long itemTwo = itemIds.get(j);
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        	Date toDate = new Date();
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                			Map<Long, Long> comparedItems;
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                			comparedItems = comparisonStats.get(itemOne);
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                			if(comparedItems==null){
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                				comparedItems = new HashMap<Long, Long>();
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                				comparisonStats.put(itemOne, comparedItems);
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                			}
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                			if(comparedItems.containsKey(itemTwo)){
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                				comparedItems.put(itemTwo, comparedItems.get(itemTwo)+1);
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                			}else{
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                				comparedItems.put(itemTwo, 1L);
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                			}
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                			comparedItems = comparisonStats.get(itemTwo);
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                			if(comparedItems==null){
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                				comparedItems = new HashMap<Long, Long>();
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                				comparisonStats.put(itemTwo, comparedItems);
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                			}
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                			if(comparedItems.containsKey(itemOne)){
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                				comparedItems.put(itemOne, comparedItems.get(itemOne)+1);
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        	SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
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                			}else{
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                				comparedItems.put(itemOne, 1L);
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            String id = sdf.format(toDate);
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                			}
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                		}
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                	}
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                }
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            }
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            JSONObject comparisonStatsJson = new JSONObject(comparisonStats);
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            ComparisonStatsRepository repo = new ComparisonStatsRepository();
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        	ComparisonStats comparisonStats = repo.getById(id);
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            resp.getWriter().println(comparisonStatsJson);
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            resp.getWriter().println(comparisonStats.getComparisonStatsJSON());
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        } catch (IOException e) {
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        } catch (IOException e) {
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            System.out.println("Unable to write at output stream");
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            System.out.println("Unable to write at output stream");
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        }
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        }
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    }
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    }