Changeset 0.29.0 (#195)

server/store/postgres/user_mention.go

@@ -0,0 +1,62 @@
+package postgres
+
+import (
+	"context"
+	"database/sql"
+
+	"git.gobha.me/xcaliber/chat-switchboard/store"
+)
+
+// ── Mention resolution + display info (v0.29.0) ────────────────────────
+
+func (s *UserStore) FindActiveByHandle(ctx context.Context, handle, excludeUserID string) (string, error) {
+	var id string
+	err := DB.QueryRowContext(ctx, `
+		SELECT id FROM users
+		WHERE LOWER(handle) = LOWER($1) AND id != $2 AND is_active = true
+		LIMIT 1
+	`, handle, excludeUserID).Scan(&id)
+	if err == sql.ErrNoRows {
+		return "", nil
+	}
+	return id, err
+}
+
+func (s *UserStore) FindActiveByHandlePrefix(ctx context.Context, prefix, excludeUserID string) (string, int, error) {
+	var count int
+	err := DB.QueryRowContext(ctx, `
+		SELECT COUNT(*) FROM users
+		WHERE LOWER(handle) LIKE LOWER($1) AND id != $2 AND is_active = true
+	`, prefix+"%", excludeUserID).Scan(&count)
+	if err != nil {
+		return "", 0, err
+	}
+	if count != 1 {
+		return "", count, nil
+	}
+	var id string
+	err = DB.QueryRowContext(ctx, `
+		SELECT id FROM users
+		WHERE LOWER(handle) LIKE LOWER($1) AND id != $2 AND is_active = true
+		LIMIT 1
+	`, prefix+"%", excludeUserID).Scan(&id)
+	return id, 1, err
+}
+
+func (s *UserStore) GetDisplayInfoByIDs(ctx context.Context, ids []string) (map[string]store.UserDisplayInfo, error) {
+	result := make(map[string]store.UserDisplayInfo)
+	for _, id := range ids {
+		var name, avatar sql.NullString
+		_ = DB.QueryRowContext(ctx, `
+			SELECT COALESCE(display_name, username), avatar_url FROM users WHERE id = $1
+		`, id).Scan(&name, &avatar)
+		if name.Valid {
+			info := store.UserDisplayInfo{Name: name.String}
+			if avatar.Valid {
+				info.Avatar = avatar.String
+			}
+			result[id] = info
+		}
+	}
+	return result, nil
+}