#!/usr/bin/env node

const java = require("../../");

java.classpath.push("./lucene-lib/lucene-core-7.4.0.jar");

java.classpath.push("./lucene-lib/lucene-analyzers-common-7.4.0.jar");

java.classpath.push("./lucene-lib/lucene-queryparser-7.4.0.jar");

const idx = java.newInstanceSync("org.apache.lucene.store.RAMDirectory");

const analyzer = java.newInstanceSync("org.apache.lucene.analysis.standard.StandardAnalyzer");

const writerConfig = java.newInstanceSync("org.apache.lucene.index.IndexWriterConfig", analyzer);

const writer = java.newInstanceSync("org.apache.lucene.index.IndexWriter", idx, writerConfig);

const queryParser = java.newInstanceSync("org.apache.lucene.queryparser.classic.QueryParser", "content", analyzer);

writer.addDocumentSync(

createDocument(

"Theodore Roosevelt",

"It behooves every man to remember that the work of the " +

"critic, is of altogether secondary importance, and that, " +

"in the end, progress is accomplished by the man who does " +

"things."

)

);

writer.addDocumentSync(

createDocument(

"Friedrich Hayek",

"The case for individual freedom rests largely on the " +

"recognition of the inevitable and universal ignorance " +

"of all of us concerning a great many of the factors on " +

"which the achievements of our ends and welfare depend."

)

);

writer.addDocumentSync(

createDocument(

"Ayn Rand",

"There is nothing to take a man's freedom away from " +

"him, save other men. To be free, a man must be free " +

"of his brothers."

)

);

writer.addDocumentSync(

createDocument("Mohandas Gandhi", "Freedom is not worth having if it does not connote " + "freedom to err.")

);

writer.closeSync();

const searcher = java.newInstanceSync(

"org.apache.lucene.search.IndexSearcher",

java.callStaticMethodSync("org.apache.lucene.index.DirectoryReader", "open", idx)

);

search(searcher, "freedom");

search(searcher, "free");

search(searcher, "progress or achievements");

function createDocument(title, content) {

const fieldStoreYes = java.callStaticMethodSync("org.apache.lucene.document.Field$Store", "valueOf", "YES");

const doc = java.newInstanceSync("org.apache.lucene.document.Document");

doc.addSync(java.newInstanceSync("org.apache.lucene.document.TextField", "title", title, fieldStoreYes));

doc.addSync(java.newInstanceSync("org.apache.lucene.document.TextField", "content", content, fieldStoreYes));

return doc;

}

function search(searcher, queryString) {

const query = queryParser.parseSync(queryString);

const topDocs = searcher.searchSync(query, 10);

console.log("Found " + topDocs.totalHits + ' hits for query "' + queryString + '".');

const scoreDocs = topDocs.scoreDocs;

for (let i = 0; i < topDocs.scoreDocs.length; i++) {

const docId = scoreDocs[i].doc;

const doc = searcher.docSync(docId);

console.log(" " + (i + 1) + ". " + doc.getSync("title"));

}

}