package calendar

import (
	"math/rand"

	"github.com/gin-gonic/gin"
	"gorm.io/gorm"
	"kumoly.io/kumoly/app/auth"
	"kumoly.io/kumoly/app/errors"
)

func HasCalAccess(c *gin.Context, cal *Calendar, cid string) error {
	err := db.First(cal, "id = ?", cid).Error
	if err != nil {
		return errors.NewError(404, err)
	}
	if cal.GroupName == "" {
		return nil
	}
	if !auth.ACHas(c, auth.ADMIN, auth.SYSTEM, cal.GroupName) {
		return errors.ErrorForbidden
	}
	return nil
}

func HasEventAccess(c *gin.Context, e *Event, eid string) error {
	err := db.First(e, "id = ?", eid).Error
	if err != nil {
		return errors.NewError(404, err)
	}
	if e.EventGroup.GroupName == "" {
		return nil
	}
	if !auth.ACHas(c, auth.ADMIN, auth.SYSTEM, e.EventGroup.GroupName) {
		return errors.ErrorForbidden
	}
	return nil
}

func ChangeCalGroup(tx *gorm.DB, cal_id, to string) error {
	affected := tx.Exec(`update calendars set group_id = (
		select id from groups where name = ?
	) where id = ?`, to, cal_id).RowsAffected
	if affected == 0 {
		return errors.ErrorNotFound
	}
	tx.Exec(`update event_groups set group_id = (
		select id from groups where name = ?
	) where id in ( 
		select event_group_id from events where calendar_id = ? 
	)`, to, cal_id)
	return nil
}

func GetNewColor(GroupName string) int {
	eg := &EventGroup{}
	if err := db.Select("color").
		Where("group_id = (select id from groups where name = ? )", GroupName).
		Last(eg).Error; err != nil {
		return rand.Intn(len(Color))
	}
	return eg.Color + 1
}