package handlers

import (
	"errors"
	"slices"
	"time"

	"gitea.tecamino.com/paadi/memberDB/models"
)

func (dh *DatabaseHandler) StartNewEvent(name string) error {
	if !dh.DatabaseOpened() {
		return errors.New("database not opened")
	}

	if nil == dh.database.Exists(&models.Event{}, "name", name, false) {
		return errors.New("event with name: " + name + " exists already")
	}

	return dh.database.AddNewColum(&models.Event{
		Name: name,
		Date: time.Now().Format("2006-01-02 15:04:05"),
	})
}

func (dh *DatabaseHandler) GetEvent(id uint) (event []models.Event, err error) {
	if !dh.DatabaseOpened() {
		return event, errors.New("database not opened")
	}

	err = dh.database.GetById(&event, id)
	if err != nil {
		return
	}

	for i := range event {
		event[i].Count = len(event[i].Attendees)
	}
	return
}

func (dh *DatabaseHandler) DeleteEvent(ids ...uint) error {
	if !dh.DatabaseOpened() {
		return errors.New("database not opened")
	}

	if len(ids) == 0 {
		return errors.New("no ids given to be deleted")
	}

	return dh.database.DeleteById(&models.Event{}, ids...)
}

func (dh *DatabaseHandler) AddAttendeesToEvent(newEvent models.Event) error {
	if !dh.DatabaseOpened() {
		return errors.New("database not opened")
	}

	var event models.Event
	err := dh.database.GetById(&event, uint(event.Id))
	if err != nil {
		return err
	}

next:
	for _, newAttendee := range newEvent.Attendees {
		for _, attendee := range event.Attendees {
			if attendee.FirstName == newAttendee.FirstName && attendee.LastName == newAttendee.LastName {
				continue next
			}
		}
		event.Attendees = append(event.Attendees, newAttendee)
	}

	event.Count = len(event.Attendees)

	return dh.database.UpdateValuesById(&event, uint(event.Id))
}

func (dh *DatabaseHandler) DeleteAttendeesFromEvent(newEvent models.Event) error {
	if !dh.DatabaseOpened() {
		return errors.New("database not opened")
	}

	var event models.Event
	dh.database.GetById(&event, uint(event.Id))

next:
	for _, newAttendee := range newEvent.Attendees {
		for i := range event.Attendees {
			if event.Attendees[i].FirstName == newAttendee.FirstName && event.Attendees[i].LastName == newAttendee.LastName {
				event.Attendees = slices.Delete(event.Attendees, i, i+1)
				continue next
			}
		}
	}
	event.Count = len(event.Attendees)
	return dh.database.UpdateValuesById(&event, uint(event.Id))
}