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
}