/**
 * Copyright 2003-2007 Jive Software.
 *
 * All rights reserved. Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jivesoftware.smackx.search;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import org.jivesoftware.smack.packet.IQ;
import org.jivesoftware.smackx.Form;
import org.jivesoftware.smackx.FormField;
import org.jivesoftware.smackx.ReportedData;
import org.jivesoftware.smackx.ReportedData.Column;
import org.xmlpull.v1.XmlPullParser;

/**
 * SimpleUserSearch is used to support the non-dataform type of JEP 55. This
 * provides the mechanism for allowing always type ReportedData to be returned
 * by any search result, regardless of the form of the data returned from the
 * server.
 * 
 * @author Derek DeMoro
 */
class SimpleUserSearch extends IQ {

	private static String getSingleValue(FormField formField) {
		final Iterator<String> values = formField.getValues();
		while (values.hasNext()) {
			return values.next();
		}
		return "";
	}

	private Form form;

	private ReportedData data;

	@Override
	public String getChildElementXML() {
		final StringBuilder buf = new StringBuilder();
		buf.append("<query xmlns=\"jabber:iq:search\">");
		buf.append(getItemsToSearch());
		buf.append("</query>");
		return buf.toString();
	}

	private String getItemsToSearch() {
		final StringBuilder buf = new StringBuilder();

		if (form == null) {
			form = Form.getFormFrom(this);
		}

		if (form == null) {
			return "";
		}

		final Iterator<FormField> fields = form.getFields();
		while (fields.hasNext()) {
			final FormField field = fields.next();
			final String name = field.getVariable();
			final String value = getSingleValue(field);
			if (value.trim().length() > 0) {
				buf.append("<").append(name).append(">").append(value)
						.append("</").append(name).append(">");
			}
		}

		return buf.toString();
	}

	public ReportedData getReportedData() {
		return data;
	}

	protected void parseItems(XmlPullParser parser) throws Exception {
		final ReportedData data = new ReportedData();
		data.addColumn(new ReportedData.Column("JID", "jid", "text-single"));

		boolean done = false;

		List<ReportedData.Field> fields = new ArrayList<ReportedData.Field>();
		while (!done) {
			if (parser.getAttributeCount() > 0) {
				final String jid = parser.getAttributeValue("", "jid");
				final List<String> valueList = new ArrayList<String>();
				valueList.add(jid);
				final ReportedData.Field field = new ReportedData.Field("jid",
						valueList);
				fields.add(field);
			}

			final int eventType = parser.next();

			if (eventType == XmlPullParser.START_TAG
					&& parser.getName().equals("item")) {
				fields = new ArrayList<ReportedData.Field>();
			} else if (eventType == XmlPullParser.END_TAG
					&& parser.getName().equals("item")) {
				final ReportedData.Row row = new ReportedData.Row(fields);
				data.addRow(row);
			} else if (eventType == XmlPullParser.START_TAG) {
				final String name = parser.getName();
				final String value = parser.nextText();

				final List<String> valueList = new ArrayList<String>();
				valueList.add(value);
				final ReportedData.Field field = new ReportedData.Field(name,
						valueList);
				fields.add(field);

				boolean exists = false;
				final Iterator<Column> cols = data.getColumns();
				while (cols.hasNext()) {
					final ReportedData.Column column = cols.next();
					if (column.getVariable().equals(name)) {
						exists = true;
					}
				}

				// Column name should be the same
				if (!exists) {
					final ReportedData.Column column = new ReportedData.Column(
							name, name, "text-single");
					data.addColumn(column);
				}
			} else if (eventType == XmlPullParser.END_TAG) {
				if (parser.getName().equals("query")) {
					done = true;
				}
			}

		}

		this.data = data;
	}

	public void setForm(Form form) {
		this.form = form;
	}

}