/*
 *    GSParams.java
 *    Copyright (C) 2008 New Zealand Digital Library, http://www.nzdl.org
 *
 *    This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation; either version 2 of the License, or
 *    (at your option) any later version.
 *
 *    This program is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *    GNU General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with this program; if not, write to the Free Software
 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
package org.greenstone.gsdl3.util;

import java.util.HashMap;

/** keeps track of the interface parameters, and their defaults */
public class GSParams {

    public static final String ACTION = "a"; // the major type of action- eg query or browse or process
    public static final String SUBACTION = "sa"; // subtype of action if we want different processing than the default
    public static final String REQUEST_TYPE = "rt"; // whether the request is just to display the service form, or to actually do a request to the service
    public static final String RESPONSE_ONLY = "ro"; // if == 1 do the request and pass back the response xml - no page formatting
    public static final String OUTPUT = "o"; // if processing is to be done, what type of output - html/xml/other??
    public static final String SERVICE = "s"; // the name of the service
    public static final String CLUSTER = "c";   // these two are the same
    public static final String SYSTEM = "s"; 
    public static final String CONFIGURE = "c"; 
    public static final String COLLECTION = "c"; 
    public static final String LANGUAGE = "l";
    public static final String DOCUMENT = "d";
    public static final String DOCUMENT_TYPE = "dt";
    public static final String RESOURCE = "r";
    public static final String PROCESS_ID = "pid"; // if a request wasn't completed, this identifies the request - used when asking for a status update
    public static final String COLLECTION_TYPE = "ct";
    
    public static final String SIBLING = "sib"; // this should not be in here
    // internal configure args
    public static final String SYSTEM_SUBSET = "ss";
    public static final String SYSTEM_CLUSTER = "sc";
    public static final String SYSTEM_MODULE_NAME = "sn";
    public static final String SYSTEM_MODULE_TYPE = "st";

    public static final String EXPAND_DOCUMENT = "ed";
    public static final String EXPAND_CONTENTS = "ec";

  // used for filtering out a piece of the final page
  public static final String EXCERPT_ID = "excerptid";
  public static final String EXCERPT_TAG = "excerpttag";
    protected HashMap param_map = null;
    
    public GSParams() {
	this.param_map = new HashMap(30);

	// add in all the standard params
	addParameter(ACTION, false); 
	addParameter(SUBACTION,  false); 
	addParameter(REQUEST_TYPE,  false);
	addParameter(RESPONSE_ONLY,  false);
	addParameter(CLUSTER,  false); // we don't want to save collection 
	//addParameter(COLLECTION); 
	addParameter(LANGUAGE,  true); 
	addParameter(DOCUMENT,  true); 
	addParameter(RESOURCE,  true); 
	addParameter(OUTPUT, false); 
	addParameter(SERVICE, false); 
	addParameter(PROCESS_ID, true); 
	addParameter(SYSTEM_SUBSET, false);
	addParameter(SYSTEM_CLUSTER, false);
	addParameter(SYSTEM_MODULE_NAME, false);
	addParameter(SYSTEM_MODULE_TYPE, false);
	addParameter(SIBLING, false);
	addParameter(DOCUMENT_TYPE, true);
	addParameter(EXPAND_DOCUMENT, false);
	addParameter(EXPAND_CONTENTS, false);
 	//addParameter();
	// ugly hack so we don't save the extlink param
	addParameter("s0.ext", false);
	addParameter(COLLECTION_TYPE,  true); // collection type - mg or mgpp

	// filtering args must be specified each time
	addParameter(EXCERPT_ID, false);
	addParameter(EXCERPT_TAG, false);
    }
    
    public boolean addParameter(String name, boolean save) {
	return addParameter(name, "", save);
    }
    
    public boolean addParameter(String name, String default_value, boolean save) {
	if (this.param_map.containsKey(name)) {
	    // already there so could not add
	    return false;
	}

	this.param_map.put(name, new Param(default_value, save));
	return true;
    }
	
    public boolean setParamDefault(String name, String default_value) {
	Param p = (Param)this.param_map.get(name);
	if (p==null) return false;
	p.default_value = default_value;
	return true;
    }
    
    public boolean shouldSave(String name) {
	if (name.startsWith("p.")) return false;
	Param p = (Param)this.param_map.get(name);
	if (p== null) return true; // if things are not in here, always save.
	return p.save;
    }
    
    private class Param {

	public String default_value = null;
	public boolean save = true;

	public Param(String default_value, boolean save) {
	    this.default_value = default_value;
	    this.save = save;
	}
    }
}