package useCases

import "RenewCMS/internal/domain/image"

type VariantPurgeResult struct {
	Files int
	Bytes int64
}

type variantCache struct {
	files   image.VariantFileRepository
	storage image.Storage
}

func (c variantCache) purgeVariant(name string) (VariantPurgeResult, error) {
	rows, err := c.files.ListByVariant(name)
	if err != nil {
		return VariantPurgeResult{}, err
	}
	return c.purge(rows)
}

func (c variantCache) purgeSource(storedName string) error {
	rows, err := c.files.ListBySource(storedName)
	if err != nil {
		return err
	}
	_, err = c.purge(rows)
	return err
}

func (c variantCache) purge(rows []image.VariantFile) (VariantPurgeResult, error) {
	var result VariantPurgeResult
	var failure error
	for _, row := range rows {
		if err := c.purgeRow(row); err != nil {
			failure = err
			continue
		}
		result.Files++
		result.Bytes += row.Size
	}
	return result, failure
}

func (c variantCache) purgeRow(row image.VariantFile) error {
	if err := c.storage.Delete(row.CachedName); err != nil {
		return err
	}
	return c.files.Delete(row.ID)
}