himbot/command/markov.go

package command

import (
	"crypto/md5"
	"fmt"
	"himbot/lib"
	"math/rand"
	"regexp"
	"strings"
	"sync"
	"time"

	"github.com/bwmarrin/discordgo"
)

// MarkovData holds the Markov chain data for different n-gram sizes
type MarkovData struct {
	// n-gram size -> prefix -> list of suffixes
	Chains map[int]map[string][]string
}

// MarkovCache caches chains to avoid rebuilding
type MarkovCache struct {
	data   map[string]*MarkovData
	hashes map[string]string
	mu     sync.RWMutex
}

var (
	markovCache = &MarkovCache{
		data:   make(map[string]*MarkovData),
		hashes: make(map[string]string),
	}
	// Regex for cleaning text
	urlRegex     = regexp.MustCompile(`https?://[^\s]+`)
	mentionRegex = regexp.MustCompile(`<[@#&!][^>]+>`)
	emojiRegex   = regexp.MustCompile(`<a?:[^:]+:\d+>`)
)

func MarkovCommand(s *discordgo.Session, i *discordgo.InteractionCreate) (string, error) {
	channelID := i.ChannelID

	numMessages := lib.AppConfig.MarkovDefaultMessages
	if len(i.ApplicationCommandData().Options) > 0 {
		if i.ApplicationCommandData().Options[0].Name == "messages" {
			numMessages = int(i.ApplicationCommandData().Options[0].IntValue())
			if numMessages <= 0 {
				numMessages = lib.AppConfig.MarkovDefaultMessages
			} else if numMessages > lib.AppConfig.MarkovMaxMessages {
				numMessages = lib.AppConfig.MarkovMaxMessages
			}
		}
	}

	// Check cache
	cacheKey := fmt.Sprintf("%s:%d", channelID, numMessages)
	if data := getCachedChain(cacheKey); data != nil {
		newMessage := generateAdvancedMessage(data)
		if newMessage != "" {
			return newMessage, nil
		}
	}

	// Fetch messages
	allMessages, err := fetchMessages(s, channelID, numMessages)
	if err != nil {
		return "", err
	}

	// Build chain
	data := buildMarkovChain(allMessages)

	// Cache chain
	setCachedChain(cacheKey, data, allMessages)

	// Generate message
	newMessage := generateAdvancedMessage(data)

	// Fallback if empty
	if newMessage == "" {
		newMessage = "I couldn't generate a message. The channel might be empty or contain no usable text."
	}

	return newMessage, nil
}

func getCachedChain(cacheKey string) *MarkovData {
	markovCache.mu.RLock()
	defer markovCache.mu.RUnlock()

	if data, exists := markovCache.data[cacheKey]; exists {
		return data
	}
	return nil
}

func setCachedChain(cacheKey string, data *MarkovData, messages []*discordgo.Message) {
	hash := hashMessages(messages)

	markovCache.mu.Lock()
	defer markovCache.mu.Unlock()

	// Only cache if we have some data
	if len(data.Chains[1]) > 10 {
		markovCache.data[cacheKey] = data
		markovCache.hashes[cacheKey] = hash

		// Simple FIFO cache cleanup
		if len(markovCache.data) > lib.AppConfig.MarkovCacheSize {
			for k := range markovCache.data {
				delete(markovCache.data, k)
				delete(markovCache.hashes, k)
				break
			}
		}
	}
}

func hashMessages(messages []*discordgo.Message) string {
	var content strings.Builder
	for _, msg := range messages {
		content.WriteString(msg.ID)
		content.WriteString(msg.Content)
	}
	return fmt.Sprintf("%x", md5.Sum([]byte(content.String())))
}

func fetchMessages(s *discordgo.Session, channelID string, numMessages int) ([]*discordgo.Message, error) {
	var allMessages []*discordgo.Message
	var lastMessageID string

	// Pre-allocate
	allMessages = make([]*discordgo.Message, 0, numMessages)

	for len(allMessages) < numMessages {
		batchSize := 100
		if numMessages-len(allMessages) < 100 {
			batchSize = numMessages - len(allMessages)
		}

		batch, err := s.ChannelMessages(channelID, batchSize, lastMessageID, "", "")
		if err != nil {
			return nil, err
		}

		if len(batch) == 0 {
			break
		}

		// Filter messages
		for _, msg := range batch {
			if !msg.Author.Bot && len(strings.TrimSpace(msg.Content)) > 0 {
				allMessages = append(allMessages, msg)
			}
		}

		lastMessageID = batch[len(batch)-1].ID

		if len(batch) < 100 {
			break
		}
	}

	return allMessages, nil
}

// cleanText normalizes text
func cleanText(text string) string {
	text = urlRegex.ReplaceAllString(text, "")
	text = mentionRegex.ReplaceAllString(text, "")
	text = emojiRegex.ReplaceAllString(text, "")
	text = strings.Join(strings.Fields(text), " ")
	return strings.TrimSpace(text)
}

// buildMarkovChain creates a Markov chain from messages
func buildMarkovChain(messages []*discordgo.Message) *MarkovData {
	data := &MarkovData{
		Chains: make(map[int]map[string][]string),
	}

	// Count words
	totalWords := 0
	for _, msg := range messages {
		cleanedContent := cleanText(msg.Content)
		if len(cleanedContent) >= 3 {
			words := strings.Fields(cleanedContent)
			totalWords += len(words)
		}
	}

	// Adjust n-gram level based on memory
	maxNGram := lib.AppConfig.MarkovMaxNGram
	estimatedMemoryMB := estimateMemoryUsage(totalWords, maxNGram)
	if estimatedMemoryMB > lib.AppConfig.MarkovMemoryLimit {
		for maxNGram > 2 && estimateMemoryUsage(totalWords, maxNGram) > lib.AppConfig.MarkovMemoryLimit {
			maxNGram--
		}
	}

	// Init maps
	for i := 1; i <= maxNGram; i++ {
		data.Chains[i] = make(map[string][]string)
	}

	for _, msg := range messages {
		cleanedContent := cleanText(msg.Content)
		if len(cleanedContent) < 3 {
			continue
		}

		words := strings.Fields(cleanedContent)
		if len(words) < 2 {
			continue
		}

		// Build chains
		for n := 1; n <= maxNGram; n++ {
			if len(words) <= n {
				continue
			}

			for i := 0; i < len(words)-n; i++ {
				// Validate sequence
				validSequence := true
				for j := 0; j < n; j++ {
					word := words[i+j]
					if len(word) < 2 || strings.ContainsAny(word, "!@#$%^&*()[]{}") {
						validSequence = false
						break
					}
				}
				if !validSequence {
					continue
				}

				// Build prefix
				var prefixBuilder strings.Builder
				for j := 0; j < n; j++ {
					if j > 0 {
						prefixBuilder.WriteString(" ")
					}
					prefixBuilder.WriteString(strings.ToLower(words[i+j]))
				}
				prefix := prefixBuilder.String()

				nextWord := words[i+n]
				data.Chains[n][prefix] = append(data.Chains[n][prefix], nextWord)
			}
		}
	}

	return data
}

// estimateMemoryUsage estimates memory usage in MB
func estimateMemoryUsage(wordCount int, maxNGram int) int {
	baseMB := wordCount / 2000

	switch maxNGram {
	case 2:
		return baseMB * 3
	case 3:
		return baseMB * 8
	case 4:
		return baseMB * 15
	case 5:
		return baseMB * 25
	case 6:
		return baseMB * 40
	default:
		return baseMB
	}
}

func init() {
	// Seed RNG
	rand.Seed(time.Now().UnixNano())
}

// MarkovQuestionCommand generates an answer
func MarkovQuestionCommand(s *discordgo.Session, i *discordgo.InteractionCreate) (string, error) {
	channelID := i.ChannelID

	var question string
	var numMessages int = lib.AppConfig.MarkovDefaultMessages

	for _, option := range i.ApplicationCommandData().Options {
		switch option.Name {
		case "question":
			question = option.StringValue()
		case "messages":
			numMessages = int(option.IntValue())
			if numMessages <= 0 {
				numMessages = lib.AppConfig.MarkovDefaultMessages
			} else if numMessages > lib.AppConfig.MarkovMaxMessages {
				numMessages = lib.AppConfig.MarkovMaxMessages
			}
		}
	}

	if question == "" {
		return "Please provide a question!", nil
	}

	cacheKey := fmt.Sprintf("%s:%d", channelID, numMessages)
	var data *MarkovData

	if cachedData := getCachedChain(cacheKey); cachedData != nil {
		data = cachedData
	} else {
		allMessages, err := fetchMessages(s, channelID, numMessages)
		if err != nil {
			return "", err
		}

		data = buildMarkovChain(allMessages)
		setCachedChain(cacheKey, data, allMessages)
	}

	answer := generateAdvancedQuestionAnswer(data, question)

	if answer == "" {
		answer = "I couldn't generate an answer to that question. The channel might not have enough relevant content."
	}

	return fmt.Sprintf("**Q:** %s\n**A:** %s", question, answer), nil
}

// generateQuestionAnswer generates answer
func generateQuestionAnswer(data *MarkovData, question string) string {
	return generateAdvancedQuestionAnswer(data, question)
}

// categorizeQuestion determines question type
func categorizeQuestion(question string) string {
	question = strings.ToLower(question)

	if strings.Contains(question, "what") {
		return "what"
	} else if strings.Contains(question, "how") {
		return "how"
	} else if strings.Contains(question, "why") {
		return "why"
	} else if strings.Contains(question, "when") {
		return "when"
	} else if strings.Contains(question, "where") {
		return "where"
	} else if strings.Contains(question, "who") {
		return "who"
	} else if strings.Contains(question, "which") {
		return "which"
	} else if strings.Contains(question, "is") || strings.Contains(question, "are") || strings.Contains(question, "do") || strings.Contains(question, "does") {
		return "yesno"
	}

	return "general"
}

// WordCandidate holds word score
type WordCandidate struct {
	Word  string
	Score int
}

// findBestStartingWords scores starting words
func findBestStartingWords(data *MarkovData, questionWords []string, questionType string) []WordCandidate {
	candidates := make(map[string]int)
	chain := data.Chains[1]

	// Score question words
	for _, word := range questionWords {
		if len(word) > 2 && !isStopWord(word) {
			if nextWords, exists := chain[word]; exists && len(nextWords) > 0 {
				candidates[word] += 10
			}
		}
	}

	// Add context words
	contextWords := getContextualWords(questionType)
	for _, word := range contextWords {
		if nextWords, exists := chain[word]; exists && len(nextWords) > 0 {
			candidates[word] += 5
		}
	}

	// Add fallback words
	for word, nextWords := range chain {
		if len(nextWords) >= 3 && len(word) > 2 && !isStopWord(word) {
			if _, exists := candidates[word]; !exists {
				candidates[word] = len(nextWords) / 2
			}
		}
	}

	// Sort candidates
	var result []WordCandidate
	for word, score := range candidates {
		result = append(result, WordCandidate{Word: word, Score: score})
	}

	for i := 0; i < len(result)-1; i++ {
		for j := i + 1; j < len(result); j++ {
			if result[j].Score > result[i].Score {
				result[i], result[j] = result[j], result[i]
			}
		}
	}

	// Top 10
	if len(result) > 10 {
		result = result[:10]
	}

	return result
}

// getContextualWords returns relevant words
func getContextualWords(questionType string) []string {
	switch questionType {
	case "what":
		return []string{"thing", "something", "object", "idea", "concept", "stuff", "item"}
	case "how":
		return []string{"way", "method", "process", "steps", "technique", "approach"}
	case "why":
		return []string{"because", "reason", "cause", "since", "due", "explanation"}
	case "when":
		return []string{"time", "moment", "day", "hour", "yesterday", "today", "tomorrow", "now", "then"}
	case "where":
		return []string{"place", "location", "here", "there", "somewhere", "anywhere"}
	case "who":
		return []string{"person", "people", "someone", "anyone", "everybody", "nobody"}
	case "which":
		return []string{"choice", "option", "selection", "pick", "prefer"}
	case "yesno":
		return []string{"yes", "no", "maybe", "definitely", "probably", "possibly", "sure", "absolutely"}
	default:
		return []string{"think", "believe", "know", "understand", "feel", "seem"}
	}
}

// scoreResponse scores the response
func scoreResponse(response string, questionType string) int {
	score := 0
	words := strings.Fields(response)

	// Length score
	if len(words) >= 8 && len(words) <= 16 {
		score += 10
	} else if len(words) >= 6 && len(words) <= 20 {
		score += 5
	}

	// Diversity score
	totalLength := 0
	for _, word := range words {
		totalLength += len(word)
	}
	if len(words) > 0 {
		avgWordLength := float64(totalLength) / float64(len(words))
		if avgWordLength > 3.5 && avgWordLength < 6.0 {
			score += 5
		}
	}

	// Content score
	contentWords := 0
	for _, word := range words {
		if len(word) > 3 && !isStopWord(strings.ToLower(word)) {
			contentWords++
		}
	}
	score += contentWords

	return score
}

// getPunctuationForQuestionType returns punctuation
func getPunctuationForQuestionType(questionType string) []string {
	switch questionType {
	case "yesno":
		return []string{".", "!", "."}
	case "why", "how":
		return []string{".", ".", "!"}
	default:
		return []string{".", ".", "!", "."}
	}
}

// min helper
func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}

// isStopWord checks for common words
func isStopWord(word string) bool {
	stopWords := map[string]bool{
		"a": true, "an": true, "and": true, "are": true, "as": true, "at": true, "be": true, "by": true,
		"for": true, "from": true, "has": true, "he": true, "in": true, "is": true, "it": true,
		"its": true, "of": true, "on": true, "that": true, "the": true, "to": true, "was": true,
		"will": true, "with": true, "or": true, "but": true, "if": true, "so": true, "do": true,
	}
	return stopWords[word]
}

// generateAdvancedMessage generates a message
func generateAdvancedMessage(data *MarkovData) string {
	if len(data.Chains[1]) == 0 {
		return ""
	}

	// Try multiple attempts
	var bestMessage string
	bestScore := 0

	for attempt := 0; attempt < 5; attempt++ {
		words := []string{}
		var currentWord string

		// Pick start word
		attempts := 0
		for word, nextWords := range data.Chains[1] {
			if len(nextWords) >= 2 && len(word) > 2 && !isStopWord(word) {
				currentWord = word
				break
			}
			attempts++
			if attempts > 50 {
				currentWord = word
				break
			}
		}

		if currentWord == "" {
			continue
		}

		// Generate words
		maxWords := 10 + rand.Intn(8)
		wordHistory := []string{currentWord}

		for i := 0; i < maxWords; i++ {
			// Add word
			if i == 0 {
				words = append(words, strings.Title(currentWord))
			} else {
				words = append(words, currentWord)
			}

			var nextWord string
			historyLen := len(wordHistory)

			// Try n-grams
			for n := 5; n >= 2; n-- {
				if historyLen >= n && data.Chains[n] != nil {
					// Build prefix
					var prefixBuilder strings.Builder
					for j := 0; j < n; j++ {
						if j > 0 {
							prefixBuilder.WriteString(" ")
						}
						prefixBuilder.WriteString(strings.ToLower(wordHistory[historyLen-n+j]))
					}
					prefix := prefixBuilder.String()

					if options, exists := data.Chains[n][prefix]; exists && len(options) > 0 {
						nextWord = selectBestNextWord(options, wordHistory)
						if nextWord != "" {
							break
						}
					}
				}
			}

			// Fallback to 1-gram
			if nextWord == "" {
				if nextWords, exists := data.Chains[1][strings.ToLower(currentWord)]; exists && len(nextWords) > 0 {
					nextWord = selectBestNextWord(nextWords, wordHistory)
				}
			}

			// Restart if needed
			if nextWord == "" {
				found := false
				for word, nextWords := range data.Chains[1] {
					if len(nextWords) > 0 && len(word) > 2 && !isStopWord(word) {
						nextWord = word
						found = true
						break
					}
				}
				if !found {
					break
				}
			}

			currentWord = nextWord
			wordHistory = append(wordHistory, currentWord)

			// Trim history
			if len(wordHistory) > 10 {
				wordHistory = wordHistory[1:]
			}
		}

		message := strings.Join(words, " ")

		// Score message
		score := scoreAdvancedMessage(message)

		if score > bestScore {
			bestScore = score
			bestMessage = message
		}
	}

	// Add punctuation
	if len(bestMessage) > 0 && !strings.ContainsAny(bestMessage[len(bestMessage)-1:], ".!?") {
		punctuation := []string{".", "!", "?", "."}
		bestMessage += punctuation[rand.Intn(len(punctuation))]
	}

	return bestMessage
}

// generateAdvancedQuestionAnswer generates answer
func generateAdvancedQuestionAnswer(data *MarkovData, question string) string {
	if len(data.Chains[1]) == 0 {
		return ""
	}

	// Analyze question
	cleanedQuestion := cleanText(question)
	questionWords := strings.Fields(strings.ToLower(cleanedQuestion))

	// Categorize question
	questionType := categorizeQuestion(cleanedQuestion)

	// Find starting words
	startingCandidates := findBestStartingWords(data, questionWords, questionType)

	if len(startingCandidates) == 0 {
		return ""
	}

	// Generate response
	return generateAdvancedCoherentResponse(data, startingCandidates, questionType)
}

// generateAdvancedCoherentResponse generates response
func generateAdvancedCoherentResponse(data *MarkovData, candidates []WordCandidate, questionType string) string {
	if len(candidates) == 0 {
		return ""
	}

	// Try multiple attempts
	var bestResponse string
	bestScore := 0

	for attempt := 0; attempt < 5; attempt++ {
		// Pick candidate
		candidateIndex := 0
		if len(candidates) > 1 {
			if rand.Float32() > 0.7 && len(candidates) > 1 {
				candidateIndex = rand.Intn(min(3, len(candidates)))
			}
		}

		currentWord := candidates[candidateIndex].Word
		words := []string{}
		wordHistory := []string{currentWord}

		// Generate response
		maxWords := 12 + rand.Intn(10)

		for i := 0; i < maxWords; i++ {
			// Add word
			if i == 0 {
				words = append(words, strings.Title(currentWord))
			} else {
				words = append(words, currentWord)
			}

			var nextWord string
			historyLen := len(wordHistory)

			// Try n-grams
			for n := 5; n >= 2; n-- {
				if historyLen >= n && data.Chains[n] != nil {
					// Build prefix
					var prefixBuilder strings.Builder
					for j := 0; j < n; j++ {
						if j > 0 {
							prefixBuilder.WriteString(" ")
						}
						prefixBuilder.WriteString(strings.ToLower(wordHistory[historyLen-n+j]))
					}
					prefix := prefixBuilder.String()

					if options, exists := data.Chains[n][prefix]; exists && len(options) > 0 {
						nextWord = selectBestNextWord(options, wordHistory)
						if nextWord != "" {
							break
						}
					}
				}
			}

			// Fallback
			if nextWord == "" {
				if nextWords, exists := data.Chains[1][strings.ToLower(currentWord)]; exists && len(nextWords) > 0 {
					nextWord = selectBestNextWord(nextWords, wordHistory)
				}
			}

			// Restart
			if nextWord == "" {
				found := false
				for _, candidate := range candidates {
					if nextWords, exists := data.Chains[1][candidate.Word]; exists && len(nextWords) > 0 {
						nextWord = candidate.Word
						found = true
						break
					}
				}
				if !found {
					break
				}
			}

			currentWord = nextWord
			wordHistory = append(wordHistory, currentWord)

			// Trim history
			if len(wordHistory) > 10 {
				wordHistory = wordHistory[1:]
			}
		}

		response := strings.Join(words, " ")

		// Score response
		score := scoreAdvancedResponse(response, questionType)

		if score > bestScore {
			bestScore = score
			bestResponse = response
		}
	}

	// Add punctuation
	if len(bestResponse) > 0 && !strings.ContainsAny(bestResponse[len(bestResponse)-1:], ".!?") {
		punctuation := getPunctuationForQuestionType(questionType)
		bestResponse += punctuation[rand.Intn(len(punctuation))]
	}

	return bestResponse
}

// scoreAdvancedMessage scores message
func scoreAdvancedMessage(message string) int {
	score := 0
	words := strings.Fields(message)

	// Length score
	if len(words) >= 10 && len(words) <= 16 {
		score += 15
	} else if len(words) >= 8 && len(words) <= 18 {
		score += 10
	} else if len(words) >= 6 && len(words) <= 20 {
		score += 5
	}

	// Diversity score
	totalLength := 0
	uniqueWords := make(map[string]bool)
	for _, word := range words {
		totalLength += len(word)
		uniqueWords[strings.ToLower(word)] = true
	}

	if len(words) > 0 {
		avgWordLength := float64(totalLength) / float64(len(words))
		if avgWordLength > 3.5 && avgWordLength < 6.5 {
			score += 8
		}

		// Uniqueness score
		uniqueRatio := float64(len(uniqueWords)) / float64(len(words))
		if uniqueRatio > 0.8 {
			score += 10
		} else if uniqueRatio > 0.6 {
			score += 5
		}
	}

	// Content score
	contentWords := 0
	for _, word := range words {
		if len(word) > 3 && !isStopWord(strings.ToLower(word)) {
			contentWords++
		}
	}
	score += contentWords * 2

	// Grammar bonus
	if !strings.Contains(message, " a a ") && !strings.Contains(message, " the the ") && !strings.Contains(message, " you you ") {
		score += 5
	}

	return score
}

// scoreAdvancedResponse scores response
func scoreAdvancedResponse(response string, questionType string) int {
	score := scoreAdvancedMessage(response) // Base score

	// Question bonuses
	responseLower := strings.ToLower(response)
	switch questionType {
	case "yesno":
		if strings.Contains(responseLower, "yes") || strings.Contains(responseLower, "no") ||
			strings.Contains(responseLower, "maybe") || strings.Contains(responseLower, "definitely") {
			score += 8
		}
	case "why":
		if strings.Contains(responseLower, "because") || strings.Contains(responseLower, "reason") ||
			strings.Contains(responseLower, "since") || strings.Contains(responseLower, "due") {
			score += 8
		}
	case "how":
		if strings.Contains(responseLower, "way") || strings.Contains(responseLower, "method") ||
			strings.Contains(responseLower, "process") || strings.Contains(responseLower, "steps") {
			score += 8
		}
	case "when":
		if strings.Contains(responseLower, "time") || strings.Contains(responseLower, "day") ||
			strings.Contains(responseLower, "hour") || strings.Contains(responseLower, "moment") {
			score += 8
		}
	case "where":
		if strings.Contains(responseLower, "place") || strings.Contains(responseLower, "location") ||
			strings.Contains(responseLower, "here") || strings.Contains(responseLower, "there") {
			score += 8
		}
	}

	return score
}

// isValidNextWord checks validity
func isValidNextWord(wordHistory []string, nextWord string) bool {
	if len(wordHistory) == 0 {
		return true
	}

	nextWordLower := strings.ToLower(nextWord)

	// No immediate repetition
	if len(wordHistory) >= 1 && strings.ToLower(wordHistory[len(wordHistory)-1]) == nextWordLower {
		return false
	}

	// No double articles
	if len(wordHistory) >= 1 {
		lastWord := strings.ToLower(wordHistory[len(wordHistory)-1])
		if (lastWord == "a" || lastWord == "the" || lastWord == "you") && lastWord == nextWordLower {
			return false
		}
	}

	// No triple repetition
	if len(wordHistory) >= 3 {
		count := 0
		for i := len(wordHistory) - 3; i < len(wordHistory); i++ {
			if strings.ToLower(wordHistory[i]) == nextWordLower {
				count++
			}
		}
		if count >= 2 {
			return false
		}
	}

	// Grammar checks
	if len(wordHistory) >= 1 {
		lastWord := strings.ToLower(wordHistory[len(wordHistory)-1])

		// No "you a"
		if lastWord == "you" && nextWordLower == "a" {
			return false
		}

		// No double articles
		if (lastWord == "a" || lastWord == "an" || lastWord == "the") &&
			(nextWordLower == "a" || nextWordLower == "an" || nextWordLower == "the") {
			return false
		}
	}

	return true
}

// selectBestNextWord picks next word
func selectBestNextWord(options []string, wordHistory []string) string {
	if len(options) == 0 {
		return ""
	}

	// Filter invalid
	var validOptions []string
	for _, option := range options {
		if isValidNextWord(wordHistory, option) {
			validOptions = append(validOptions, option)
		}
	}

	// Fallback
	if len(validOptions) == 0 {
		var fallbackOptions []string
		for _, option := range options {
			// Avoid repetition
			if len(wordHistory) == 0 || strings.ToLower(wordHistory[len(wordHistory)-1]) != strings.ToLower(option) {
				fallbackOptions = append(fallbackOptions, option)
			}
		}
		if len(fallbackOptions) > 0 {
			validOptions = fallbackOptions
		} else {
			validOptions = options
		}
	}

	// Prefer meaningful words
	var goodOptions []string
	for _, option := range validOptions {
		if len(option) > 2 && !isStopWord(strings.ToLower(option)) {
			goodOptions = append(goodOptions, option)
		}
	}

	if len(goodOptions) > 0 {
		return goodOptions[rand.Intn(len(goodOptions))]
	}

	return validOptions[rand.Intn(len(validOptions))]
}