feat: extract groups from message logs

internal/isphere/groups.go

@@ -0,0 +1,81 @@
+package isphere
+
+import (
+	"sort"
+	"strings"
+)
+
+type Group struct {
+	GroupID     string
+	DisplayName string
+	Source      string
+	Confidence  float64
+	RawRef      string
+}
+
+type SearchGroupsQuery struct {
+	Query string
+	Limit int
+}
+
+type SearchGroupsResult struct {
+	Groups []Group
+}
+
+func SearchGroupsFromMessages(messages []Message, query SearchGroupsQuery) SearchGroupsResult {
+	unique := map[string]Group{}
+	for _, message := range messages {
+		if strings.EqualFold(message.ConversationType, "groupchat") {
+			addMessageGroup(unique, message.SenderID)
+			addMessageGroup(unique, message.ReceiverID)
+			continue
+		}
+		if isLikelyGroupJID(message.SenderID) {
+			addMessageGroup(unique, message.SenderID)
+		}
+		if isLikelyGroupJID(message.ReceiverID) {
+			addMessageGroup(unique, message.ReceiverID)
+		}
+	}
+
+	queryText := strings.ToLower(strings.TrimSpace(query.Query))
+	ids := make([]string, 0, len(unique))
+	for id := range unique {
+		if queryText == "" || strings.Contains(strings.ToLower(id), queryText) || strings.Contains(strings.ToLower(unique[id].DisplayName), queryText) {
+			ids = append(ids, id)
+		}
+	}
+	sort.Strings(ids)
+
+	limit := query.Limit
+	if limit <= 0 || limit > len(ids) {
+		limit = len(ids)
+	}
+	groups := make([]Group, 0, limit)
+	for _, id := range ids[:limit] {
+		groups = append(groups, unique[id])
+	}
+	return SearchGroupsResult{Groups: groups}
+}
+
+func addMessageGroup(unique map[string]Group, id string) {
+	trimmed := strings.TrimSpace(id)
+	if trimmed == "" || !isLikelyGroupJID(trimmed) {
+		return
+	}
+	if _, exists := unique[trimmed]; exists {
+		return
+	}
+	unique[trimmed] = Group{
+		GroupID:     trimmed,
+		DisplayName: trimmed,
+		Source:      "local_readonly",
+		Confidence:  0.6,
+		RawRef:      "groupchat_jid",
+	}
+}
+
+func isLikelyGroupJID(id string) bool {
+	lower := strings.ToLower(strings.TrimSpace(id))
+	return strings.Contains(lower, "conference") || strings.Contains(lower, "muc") || strings.Contains(lower, "group")
+}