package usersettings

import (
	"context"
	"time"

	"velox-bot/internal/db/repos/usersettingsrepo"
)

type Service struct {
	repo *usersettingsrepo.Repo
}

func New(repo *usersettingsrepo.Repo) *Service {
	return &Service{repo: repo}
}

func (s *Service) SetTimezone(ctx context.Context, userID int64, zone string) error {
	// validate zone before storing
	if _, err := time.LoadLocation(zone); err != nil {
		return err
	}
	return s.repo.SetTimezone(ctx, userID, zone)
}

// GetTimezone returns the user's location (or UTC) and the zone string and a flag indicating if it was user-defined.
func (s *Service) GetTimezone(ctx context.Context, userID int64) (*time.Location, string, bool, error) {
	zone, ok, err := s.repo.GetTimezone(ctx, userID)
	if err != nil {
		return time.UTC, "UTC", false, err
	}
	if !ok || zone == "" {
		return time.UTC, "UTC", false, nil
	}
	loc, err := time.LoadLocation(zone)
	if err != nil {
		// fallback to UTC but indicate not user-defined
		return time.UTC, "UTC", false, nil
	}
	return loc, zone, true, nil
}