const _ = require("lodash")
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const {Index, Document, Worker} = require("flexsearch")
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const settings = require("../settings")
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const fs = require("node:fs")
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/////////////////////////////////////////////////////////////////////////
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// Message index
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const options = {
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// tokenize: "full",
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tokenize: "forward",
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split: true,
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}
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const idxUser = new Index(options)
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// Tag index
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const optionsTag = {
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tokenize: "forward", // nur vorwärts indexieren bei den tags
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split: true, // ein Tag ist immer nur ein Wort
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// split: true, // doc
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encode: function (it) {
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// return it
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return it.split(" ")
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// return [it]
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},
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// encode: it => function (it) {
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// return it.split(" ")
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// },
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// encode: "default",
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stemmer: false,
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matcher: false,
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context: false,
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}
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const idxTags = new Index(optionsTag)
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// const idxTags = new Document({
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// document: {
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// id: "_id",
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// index: [
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// {
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// field: "tags",
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// tokenize: "forward",
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// // encode: it => it, // encode sorgt dafür, dass die Suche nach "+" funktioniert, aber auch dass komische Ergebnisse erscheinen
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// }
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// ],
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// },
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// })
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/////////////////////////////////////////////////////////////////////////
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module.exports = {
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// idxMessage: idxUser,
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// idxTags,
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doIndex,
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search,
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// searchUsers,
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// searchTags,
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// addMessage: addUser,
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// updateMessage: updateUser,
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// deleteMessage: removeUser,
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// addTags,
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// removeTags,
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}
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// run()
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// .then(console.log)
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// .catch(console.error)
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async function run () {
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await doIndex()
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console.log(search("latu"))
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}
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/////////////////////////////////////////////////////////////////////////
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async function doIndex () {
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const start = Date.now()
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console.log("++ START indexing Users...")
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const {readFromFile, file} = settings.search
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let users
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if (readFromFile) {
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users = fs.readFileSync(file, "utf8")
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users = JSON.parse(users)
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}
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else {
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// TODO zweite möglichkeit "readFromApi" implementieren
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}
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for (const user of users) {
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addUser(user)
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// addTags(user)
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}
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console.log(`++ END indexing Users in ${Date.now() - start}ms`)
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}
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function search (query) {
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const searchLimit = 10000
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return idxUser.search(query, searchLimit)
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}
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function searchUsers (query, user) {
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// query = query.split(" ").join(" OR ") // ohne das "OR" scheint immer nur "AND" zu sein | die search option {bool:"or"} wird ignoriert
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// console.log(`searching messages for "${query}"`)
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return idxUser.search(`${user} ${query}`, {suggest: true})
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}
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function searchTags (query, user) {
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const limit = 100000 // todo das mit dem Limit anders lösen // count? nein siehe https://github.com/nextapps-de/flexsearch?tab=readme-ov-file#limit--offset
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const results = idxTags.search(`${user} ${query}`, limit)
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return results
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// format is now [{field,result:[_id]}] because using document index
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// return results.length ? results[0].result : []
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}
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/////// idxMessage FNS ////////////////////////////////////////////////////////////////
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function getUserString (user) {
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const {usr_id, firstname, lastname, institution, department} = user
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return `${usr_id} ${firstname} ${lastname} ${institution} ${department}`.trim()
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// return `${usr_id} ${firstname} ${lastname}`.trim()
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}
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function addUser (user) {
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add(idxUser, user.usr_id, getUserString(user))
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}
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function updateUser ({_id, title, tags, user}) {
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update(idxUser, user.usr_id, getUserString(user))
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}
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function removeUser (usr_id) {
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remove(idxUser, usr_id)
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}
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/////// idxTags FNS ////////////////////////////////////////////////////////////////
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/**
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* add Tags from a message
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* @param _id
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* @param tags
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*/
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function addTags (msg) {
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let {_id, tags, user} = msg
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if (!tags) throw new Error("tags must be an array")
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if (_.isString(tags)) tags = [tags]
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add(idxTags, _id.toString(), `${user} ${tags.join(" ")}`) // muss erst gejoined werden, dann später in encode wird noch mal gesplittet - anders rum geht es nicht!
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}
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function removeTags (_id) {
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remove(idxTags, _id.toString())
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}
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/////// FNS ////////////////////////////////////////////////////////////////
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function add (index, key, value) {
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index.add(key, value)
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}
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function update (index, key, value) {
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index.update(key, value)
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}
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function remove (index, key) {
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index.remove(key)
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}
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