package services

import (
	"log"
	"time"
	"whimsoc/vindn-backend/models"
	"whimsoc/vindn-backend/repositories"
	"whimsoc/vindn-backend/utils"
)

// Events older than this are pure housekeeping — the frontend's display
// queries already hide anything past its own end_date immediately, so this
// buffer is just how long a soft-deleted event's detail page (e.g. a
// bookmarked or shared link) keeps resolving before it's cleaned up too.
const cleanupAfterDays = 90

func FetchEvents() ([]models.Event, error) {
	return utils.FetchDataFromAPI()
}

type EventService struct {
	repo repositories.EventRepository
}

func NewEventService(repo repositories.EventRepository) *EventService {
	return &EventService{repo}
}

func (s *EventService) ImportEvents() error {
	events, err := utils.FetchDataFromAPI()
	if err != nil {
		return err
	}

	log.Println("Data will be saved.")
	for _, event := range events {
		if err := s.repo.Save(&event); err != nil {
			log.Println("Fehler beim Speichern:", err)
		}
	}

	log.Println("Data is saved.")

	return nil
}

// CleanupOldEvents soft-deletes events that ended more than
// cleanupAfterDays ago, so the events table doesn't grow forever — the ODH
// import only ever upserts and never removes rows on its own.
func (s *EventService) CleanupOldEvents() error {
	cutoff := time.Now().AddDate(0, 0, -cleanupAfterDays).Format("2006-01-02")

	affected, err := s.repo.SoftDeleteEndedBefore(cutoff)
	if err != nil {
		return err
	}

	log.Printf("Cleanup: soft-deleted %d event(s) that ended before %s", affected, cutoff)

	return nil
}