feat: add party-size queueing and call modes

server/internal/httpapi/experienced_people.go

@@ -0,0 +1,34 @@
+package httpapi
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"calllinesystem/server/internal/domain"
+	"calllinesystem/server/internal/model"
+)
+
+// displayedExperiencedPeople returns the current project's public daily
+// metric. A queue session is created lazily on the first ticket, so a nil
+// session intentionally still returns the configured starting display value.
+func (s *Server) displayedExperiencedPeople(ctx context.Context, project model.Project, session *model.QueueSession) (int64, error) {
+	var actual int64
+	if session != nil {
+		location, err := time.LoadLocation(project.Timezone)
+		if err != nil {
+			return 0, fmt.Errorf("invalid project timezone: %w", err)
+		}
+		businessDate := s.now().In(location).Format("2006-01-02")
+		if session.BusinessDate.Format("2006-01-02") != businessDate {
+			return domain.DisplayExperiencedPeople(project.ExperiencedPeopleStart, 0), nil
+		}
+		if err := s.db.WithContext(ctx).Model(&model.QueueTicket{}).
+			Select("COALESCE(sum(party_size), 0)").
+			Where("project_id = ? AND queue_session_id = ?", project.ID, session.ID).
+			Scan(&actual).Error; err != nil {
+			return 0, err
+		}
+	}
+	return domain.DisplayExperiencedPeople(project.ExperiencedPeopleStart, actual), nil
+}