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/**
 * 
 */
package search.test;

import java.io.File;
import java.io.IOException;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.index.CorruptIndexException;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.Sort;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.TopFieldDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.store.LockObtainFailedException;
import org.junit.Before;
import org.junit.Test;

/**
 * @author tangfulin
 *
 */
public class IndexTest {
	
	private final String idxPath = "/home/tangfulin/svn/data/search2";
	private final Analyzer analyzer = new StandardAnalyzer();
	
	IndexWriter writer;
	IndexSearcher searcher;
	
	private void buildIdx(){
		try {			
			writer = new IndexWriter(idxPath, analyzer, IndexWriter.MaxFieldLength.UNLIMITED);			
			
			for (int i=0; i<10; ++i){
				Document doc = new Document();
				Field f0 = new Field("num", "" + i, Field.Store.YES, Field.Index.ANALYZED);
				Field f1 = new Field("title", "test NO." + i, Field.Store.YES, Field.Index.ANALYZED);
				Field f2 = new Field("content", "this is my test NO." +i, Field.Store.YES, Field.Index.ANALYZED);
				
				doc.add(f0);
				doc.add(f1);
				doc.add(f2);
				writer.addDocument(doc);
			}
			
			writer.optimize();
			writer.close();
						
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	private void printFiles(String path){
		File[] files = (new File(path)).listFiles();
		System.out.println("-------------");
		for (File f : files){
			System.out.println("file: " + f.getName() + " \t time:" + f.lastModified()%1000000/1000);
		}
		System.out.println("-------------");
		try {
			Thread.sleep(1000);
		} catch (InterruptedException e) {
		}
	}
	
	private void cleanFiles(String path){
		File[] files = (new File(path)).listFiles();
		for (File f : files){
			f.delete();
		}
	}
	
	private IndexSearcher getSearcher(){
		Directory dir;
		IndexSearcher se;
		try {
			dir = FSDirectory.getDirectory(idxPath);
			se = new IndexSearcher(IndexReader.open(dir, true));
			
		} catch (IOException e) {
			e.printStackTrace();
			return null;
		}
		
		return se;
	}
	
	private IndexSearcher reopenSearcher(IndexSearcher searcher){
		IndexReader reader = searcher.getIndexReader();
		try {
			IndexReader newReader = reader.reopen();
			if (newReader != reader){
				System.out.println("new reader!");
				reader.close();
				reader = newReader;
				searcher = new IndexSearcher(reader);
			}
			else {
				System.out.println("reader stay unchanged!");
			}
		} catch (CorruptIndexException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
		return searcher;
	}
	
	private void searchIdx(IndexSearcher searcher, String field, String text){
		try {
			TopFieldDocs topFieldDocs = searcher.search(new TermQuery(new Term(field, text)), null, 100, Sort.RELEVANCE);
			ScoreDoc[] hits = topFieldDocs.scoreDocs;
			for (int i = 0; i < hits.length; ++i) {
				Document doc = searcher.doc(hits[i].doc);
				System.out.println("ScoreDoc No." + i + " : " + hits[i].doc + " score:" + hits[i].score + "fields: " + doc.getFields());
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
		System.out.println("-------------");
	}

	@Before
	public void setUp() {
		cleanFiles(idxPath);
		buildIdx();
	}
	
	@Test
	public final void indexTest(){
		
		searcher = getSearcher();
		
		searcher = reopenSearcher(searcher);
		
		printFiles(idxPath);
		System.out.println("before delete");
		searchIdx(searcher, "title", "test");
		
		searcher = reopenSearcher(searcher);
		
		try {
			writer = new IndexWriter(idxPath, analyzer, IndexWriter.MaxFieldLength.UNLIMITED);
			writer.deleteDocuments(new Term("title", "test"));
			//writer.optimize();
			writer.close();
		} catch (CorruptIndexException e) {
			e.printStackTrace();
		} catch (LockObtainFailedException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
		System.out.println("after delete");
		printFiles(idxPath);
		searchIdx(searcher, "title", "test");
		
		System.out.println("after searcher reopen");
		searcher = reopenSearcher(searcher);
		searchIdx(searcher, "title", "test");
		
	}
	
	//@Test
	public final void searchTest(){
		searcher = getSearcher();
		searchIdx(searcher, "title", "test");
		
	}
	
}