package useCases

import (
	"RenewCMS/internal/domain/audit"
	"RenewCMS/internal/domain/image"
	"context"
)

type DeleteVariantUseCase struct {
	variants image.VariantRepository
	cache    variantCache
	recorder audit.Recorder
}

func NewDeleteVariantUseCase(variants image.VariantRepository, files image.VariantFileRepository, storage image.Storage, recorder audit.Recorder) *DeleteVariantUseCase {
	return &DeleteVariantUseCase{variants, variantCache{files, storage}, recorder}
}

func (u *DeleteVariantUseCase) Delete(ctx context.Context, name string) error {
	if _, err := u.variants.Get(name); err != nil {
		return err
	}

	event := audit.NewEvent(audit.ActionVariantDelete, audit.CategoryMedia)
	event.Target = audit.VariantTarget(name)
	purged, err := u.cache.purgeVariant(name)
	if err == nil {
		err = u.variants.Delete(name)
	}
	if err != nil {
		recordFailure(ctx, u.recorder, event, err)
		return err
	}
	event.Params = variantPurgeParams(purged)
	u.recorder.Record(ctx, event)
	return nil
}

func variantPurgeParams(purged VariantPurgeResult) map[string]any {
	return map[string]any{audit.ParamPurgedFiles: purged.Files, audit.ParamPurgedBytes: purged.Bytes}
}