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/*
 * Copyright 2008-2011 the original author or authors.
 * 
 * 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 com.nominanuda.solr;

import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

import org.apache.solr.client.solrj.SolrQuery;
import org.apache.solr.client.solrj.SolrServer;
import org.apache.solr.client.solrj.SolrServerException;
import org.apache.solr.client.solrj.response.QueryResponse;
import org.apache.solr.client.solrj.util.ClientUtils;
import org.apache.solr.common.SolrDocumentList;
import org.apache.solr.common.SolrInputDocument;
import org.apache.solr.common.SolrInputField;

import com.nominanuda.dataobject.DataArray;
import com.nominanuda.dataobject.DataArrayImpl;
import com.nominanuda.dataobject.DataObject;
import com.nominanuda.dataobject.DataStructHelper;
import com.nominanuda.lang.Check;

public class SolrHelper {
	public static final SolrHelper SOLR = new SolrHelper();
	private static final DataStructHelper struct = new DataStructHelper();

	public DataArray listResultsDotAware(SolrServer solr, SolrQuery sq, int start, int count) throws SolrServerException {
		DataArray res = new DataArrayImpl();
		sq.setStart(start);
		sq.setRows(count);
		QueryResponse qr = solr.query(sq);
		qr.getResults();
		SolrDocumentList sdl = qr.getResults();
		for(Map d : sdl) {
			DataObject o = solrDoc2DataObject(d);
			res.add(o);
		}
		return res;
	}

	public DataObject solrDoc2DataObject(Map d) {
		return (DataObject)struct.fromFlatMap(normalizeDynFields(d));
	}

	public DataObject sid2DataObject(SolrInputDocument sid) {
		Map m = new LinkedHashMap();
		Iterator itr = sid.iterator();
		while(itr.hasNext()) {
			SolrInputField f = itr.next();
			m.put(f.getName(), f.getValue());
		}
		return solrDoc2DataObject(m);
	}

	private Map normalizeDynFields(Map d) {
		Map res = new LinkedHashMap();
		for(Entry e : d.entrySet()) {
			String name = e.getKey();
			if(isDynamicFieldName(name)) {
				name = fromDynamicFieldName(name);
			}
			res.put(name, e.getValue());
		}
		return res;
	}

	private boolean isDynamicFieldName(String s) {
		return s.endsWith("_l")
			|| s.endsWith("_d")
			|| s.endsWith("_s")
			|| s.endsWith("_b")
			;
	}
	
	private String makeDynamicFieldName(String name, Object val) {
		switch (struct.getDataType(val)) {
		case bool:
			return name + "_b";
		case number:
			return val instanceof Long ? name + "_l" : name + "_d";
		case string:
			return name + "_s";
		default:
			return Check.illegalargument.fail();
		}
	}
	private String fromDynamicFieldName(String dName) {
		return dName.substring(0, dName.length() - 2);
	}

	public String escAndQuote(String s) {
		return '"' + esc(s) + '"';
	}

	public String esc(String s) {
		return ClientUtils.escapeQueryChars(s);
	}

	//TODO more than one level + nested fields naming convention
	public SolrInputDocument sid(DataObject obj, Set solrFields) {
		SolrInputDocument sid = new SolrInputDocument();
		for(String k : obj.getKeys()) {
			Object val = obj.get(k);
			if(val == null) {
				continue;
			} else if(struct.isPrimitiveOrNull(val)) {
				addField(sid, k, val, solrFields);
			} else if(struct.isDataObject(val)) {
				DataObject o = (DataObject) val;
				for(String k1 : o.getKeys()) {
					Object val1 = o.get(k1);
					if(val1 == null) {
						continue;
					} else if(struct.isPrimitiveOrNull(val1)) {
						if(solrFields.contains(k+"."+k1)) {
							addField(sid, k+"."+k1, val1, solrFields);
						} else {
							addField(sid, k+"."+makeDynamicFieldName(k1, val1), val1, solrFields);
						}
					}
				}
			} else if(struct.isDataArray(val)) {
				DataArray a = (DataArray) val;
				Collection