package org.dspace.search;

import javax.servlet.http.HttpServletRequest;
import java.util.HashMap;
import java.util.Iterator;
import org.apache.oro.text.perl.Perl5Util;


public class QueryArgs
{
    // the query string
    private String query;
    
    // start and count defines a search 'cursor' or page
    // query will return 'count' hits beginning at offset 'start'
    private int start    = 0;    // default values
    private int pageSize = 10;


    /**
     * set the query string
     */
    public void setQuery( String newQuery ) { query = newQuery; }

    
    /**
     * retrieve the query string
     */
    public String getQuery() { return query; }
    
    
    /**
     * set the offset of the desired search results,
     *  beginning with 0 ; used to page results
     *  (the default value is 0)
     */
    public void setStart( int newStart ) { start = newStart; }
    
    
    /**
     * read the search's starting offset
     */
    public int getStart() { return start; }
    
    
    /**
     * set the count of hits to return;
     *  used to implement paged searching
     *  see the initializer for the default value
     */
    public void setPageSize( int newSize ) { pageSize = newSize; }
    
    
    /**
     * get the count of hits to return
     */
    public int getPageSize() { return pageSize; }
    
    public String buildQuery (HttpServletRequest request)
    {
    	String newquery = "(";
    	String query1 	= request.getParameter("query1");
    	String query2 	= request.getParameter("query2");
    	String query3 	= request.getParameter("query3");
    	
    	String field1 	= request.getParameter("field1");
    	String field2 	= request.getParameter("field2");
    	String field3 	= request.getParameter("field3");

    	String conjunction1 	= request.getParameter("conjunction1");
    	String conjunction2 	= request.getParameter("conjunction2");
    	
    	if (query1.length() > 0)
    	{    		
    		newquery = newquery + buildQueryPart(query1, field1); 
    	}
    	
    	if (query2.length() > 0)
    	{
    		newquery = newquery + " " + conjunction1 + " ";
    		newquery = newquery + buildQueryPart(query2, field2); 
    	}
    	
    	newquery = newquery + ")";
    	
    	if (query3.length() > 0)
    	{
			newquery = newquery + " " + conjunction2 + " ";
    		newquery = newquery + buildQueryPart(query3, field3); 
    	}

    	return (newquery);
    }
    
    private String buildQueryPart (String myquery, String myfield)
    {	
    	Perl5Util util  = new Perl5Util();
    	String newquery = "(";
    	String pattern = "";
    	 
    	if (!myfield.equals("ANY")) {
    		newquery = newquery + myfield + ":";
    		myquery = util.substitute("s/\'(.*)\'/\"$1\"/g", myquery);
    		if (!util.match("/\".*\"/", myquery))
    		{
    			myquery = util.substitute("s/ / " + myfield + ":/g", myquery);
    		}
    	}

    	newquery = newquery +  myquery + ")";
    	return (newquery);
    }

    public HashMap buildQueryHash (HttpServletRequest request)
    {	
    	HashMap queryHash = new HashMap();
		queryHash.put("query1", request.getParameter("query1") == null ? "" : request.getParameter("query1"));
		queryHash.put("query2", request.getParameter("query2") == null ? "" : request.getParameter("query2"));
		queryHash.put("query3", request.getParameter("query3") == null ? "" : request.getParameter("query3"));
    	
		queryHash.put("field1", request.getParameter("field1") == null ? "ANY" : request.getParameter("field1"));
		queryHash.put("field2", request.getParameter("field2") == null ? "ANY" : request.getParameter("field2"));
		queryHash.put("field3", request.getParameter("field3") == null ? "ANY" : request.getParameter("field3"));

		queryHash.put("conjunction1", request.getParameter("conjunction1") == null ? "AND" : request.getParameter("conjunction1"));
		queryHash.put("conjunction2", request.getParameter("conjunction2") == null ? "AND" : request.getParameter("conjunction1"));
    	
    	return (queryHash);
    }

    public String buildHTTPQuery (HttpServletRequest request)
    {	
    	String querystring = "";
    	HashMap queryHash = buildQueryHash(request);
    	
		Iterator i = queryHash.keySet().iterator();
        while(i.hasNext())
        {
            String key   = (String)i.next();
            String value = (String)queryHash.get(key);
            	
           	querystring = querystring + "&" + key + "=" + value;
        }

    	
    	return (querystring);
    }

}