From 2c0c2440600d009553ea7668907a336cb64e0e6e Mon Sep 17 00:00:00 2001
From: Eugene <me@shadowsparky.ru>
Date: Sun, 9 Aug 2026 17:57:53 +0300
Subject: [PATCH] update filter alghoritm

---
 .../vbox/backend/data/FuzzySearchFilter.kt    | 45 +++++--------------
 .../vbox/backend/data/http/SessionVideoApi.kt |  2 +-
 2 files changed, 13 insertions(+), 34 deletions(-)

diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/FuzzySearchFilter.kt b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/FuzzySearchFilter.kt
index f8c8764..f057ee3 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/FuzzySearchFilter.kt
+++ b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/FuzzySearchFilter.kt
@@ -2,7 +2,6 @@ package ru.shadowsparky.vbox.backend.data
 
 import org.koin.core.annotation.Single
 import ru.shadowsparky.vbox.shared.domain.model.VideoItem
-import kotlin.math.max
 
 @Single
 class FuzzyMovieSearchFilter {
@@ -15,20 +14,9 @@ class FuzzyMovieSearchFilter {
             if (titleNormalized.contains(query)) {
                 return@map Pair(movie, 1.0)
             }
-            val queryWords = query.split(" ")
-            val titleWords = titleNormalized.split(" ")
-            var maxScore = 0.0
-            for (qWord in queryWords) {
-                for (tWord in titleWords) {
-                    val score = tWord.fuzzySimilarity(qWord)
-                    if (score > maxScore) maxScore = score
-                }
-            }
-            Pair(movie, maxScore)
-        }
-        .filter { it.second >= THRESHOLD }
-        .sortedByDescending { it.second }
-        .map { it.first }
+            val score = titleNormalized.fuzzySimilarity(query)
+            Pair(movie, score)
+        }.filter { it.second >= THRESHOLD }.sortedByDescending { it.second }.map { it.first }
     }
 
     private fun String.normalize(): String {
@@ -61,27 +49,18 @@ class FuzzyMovieSearchFilter {
 
     private fun String.fuzzySimilarity(other: String): Double {
         if (this == other) return 1.0
-        if (this.isEmpty() || other.isEmpty()) return 0.0
-        val s1 = this
-        val dp = IntArray(other.length + 1) { it }
-        for (i in 1..s1.length) {
-            var prev = dp[0]
-            dp[0] = i
-            for (j in 1..other.length) {
-                val temp = dp[j]
-                if (s1[i - 1] == other[j - 1]) {
-                    dp[j] = prev
-                } else {
-                    dp[j] = minOf(dp[j - 1], dp[j], prev) + 1
-                }
-                prev = temp
-            }
+        if (this.isBlank() || other.isBlank()) return 0.0
+        val s1Pairs = this.windowed(2)
+        val s2Pairs = other.windowed(2).toMutableList()
+        if (s1Pairs.isEmpty() || s2Pairs.isEmpty()) return 0.0
+        var matches = 0
+        for (pair in s1Pairs) {
+            if (s2Pairs.remove(pair)) { matches++ }
         }
-        val maxLen = max(s1.length, other.length)
-        return (maxLen - dp[other.length]).toDouble() / maxLen
+        return (2.0 * matches) / (s1Pairs.size + other.windowed(2).size)
     }
 
     private companion object {
-        const val THRESHOLD: Double = 0.5
+        const val THRESHOLD: Double = 0.45
     }
 }
diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/http/SessionVideoApi.kt b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/http/SessionVideoApi.kt
index d7022f8..c5f1655 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/http/SessionVideoApi.kt
+++ b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/http/SessionVideoApi.kt
@@ -26,7 +26,7 @@ class SessionVideoApi(
     private val linksMutex = Mutex()
 
     override suspend fun fetchNewVideos(query: String?): VideosResponse {
-        val cacheKey = query.orEmpty()
+        val cacheKey = query?.trim().orEmpty()
         videosCache.getValid(cacheKey)?.let { return it }
         return videosMutex.withLock {
             videosCache.getValid(cacheKey) ?: run {