package controllers

import (
	"context"

	"git.golem15.com/golem15/sm-journal-plugin/classes"
	"git.golem15.com/golem15/summercms/modules/backpack"
	"git.golem15.com/golem15/summercms/modules/cabana"
	"gorm.io/gorm"
)

// siteCachePurger returns the published *classes.SiteCachePurger and the
// save transaction of ctx, for classes.PurgeSiteCacheAfterCommit. Without a
// purger (no purge configured) or outside a save transaction it returns a
// nil purger, which PurgeSiteCacheAfterCommit ignores.
func siteCachePurger(ctx context.Context, app func() *backpack.App) (*classes.SiteCachePurger, *gorm.DB) {
	if app == nil {
		return nil, nil
	}
	a := app()
	if a == nil {
		return nil, nil
	}
	purger, ok := a.Lookup[*classes.SiteCachePurger]()
	if !ok || purger == nil {
		return nil, nil
	}
	tx, ok := cabana.TxFromContext(ctx)
	if !ok {
		return nil, nil
	}
	return purger, tx
}