#9 Major routes refactor and expansion, #15 Added API for statistics, Added search cache backend and functionality tests, Backend sync improvements

internal/backend/search_cache.go

@@ -0,0 +1,100 @@
+package backend
+
+import (
+	"regexp"
+	"strings"
+	"sync"
+)
+
+// SoundtrackData holds precomputed search data for a soundtrack
+type SoundtrackData struct {
+	Original  string
+	Lowercase string
+	Cleaned   string
+}
+
+var (
+	searchCache           []SoundtrackData
+	searchCacheMutex      sync.Mutex
+	searchRegexCache      = make(map[string]*regexp.Regexp)
+	searchRegexCacheMutex sync.Mutex
+)
+
+// GetSearchCache returns the precomputed search cache, initializing it if needed
+func GetSearchCache() []SoundtrackData {
+	searchCacheMutex.Lock()
+	defer searchCacheMutex.Unlock()
+
+	if len(searchCache) == 0 {
+		loadSearchCache()
+	}
+	return searchCache
+}
+
+// ReloadSearchCache clears and reloads the search cache.
+// This should be called after a sync operation to ensure search results are up to date.
+func ReloadSearchCache() {
+	searchCacheMutex.Lock()
+	defer searchCacheMutex.Unlock()
+	searchCache = nil
+	loadSearchCache()
+}
+
+// loadSearchCache loads the soundtrack data into the cache
+func loadSearchCache() {
+	soundtracks := GetAllSoundtracks()
+	searchCache = make([]SoundtrackData, len(soundtracks))
+
+	for i, soundtrack := range soundtracks {
+		cleaned := cleanSearchTerm(soundtrack)
+		lowercase := strings.ToLower(soundtrack)
+		searchCache[i] = SoundtrackData{
+			Original:  soundtrack,
+			Lowercase: lowercase,
+			Cleaned:   cleaned,
+		}
+	}
+}
+
+// CleanSearchTermForMatch cleans a search term for better matching
+func CleanSearchTermForMatch(term string) string {
+	term = strings.ReplaceAll(term, " ", "")
+	term = strings.ReplaceAll(term, "é", "e")
+	term = strings.ReplaceAll(term, "+", "plus")
+	term = strings.ReplaceAll(term, "&", "and")
+	term = strings.ReplaceAll(term, "'n", "and")
+	return strings.ToLower(term)
+}
+
+// cleanSearchTerm cleans a search term for better matching (internal)
+func cleanSearchTerm(term string) string {
+	return CleanSearchTermForMatch(term)
+}
+
+// MatchRegexCached checks if a search term matches using cached compiled regex
+func MatchRegexCached(searchTerm string, soundtrackName string) bool {
+	if searchTerm == "" {
+		return true
+	}
+
+	// Check cache first
+	searchRegexCacheMutex.Lock()
+	re, exists := searchRegexCache[searchTerm]
+	if !exists {
+		re = compileSearchRegex(searchTerm)
+		searchRegexCache[searchTerm] = re
+	}
+	searchRegexCacheMutex.Unlock()
+
+	return re.MatchString(soundtrackName)
+}
+
+// compileSearchRegex compiles a search term into a regex pattern
+func compileSearchRegex(searchTerm string) *regexp.Regexp {
+	regText := ".*"
+	for _, letter := range searchTerm {
+		regText += string(letter) + ".*"
+	}
+	re, _ := regexp.Compile(regText)
+	return re
+}