138 lines
3.5 KiB
Go
138 lines
3.5 KiB
Go
package useCases
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import (
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"RenewCMS/internal/domain/article"
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"RenewCMS/internal/domain/image"
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"cmp"
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"errors"
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"slices"
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"strings"
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)
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type MergeMediaResult struct {
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ArticlesUpdated int
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Merged int
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}
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type MergeMediaUseCase struct {
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imageRepository image.Repository
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articleRepository article.Repository
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}
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func NewMergeMediaUseCase(imageRepository image.Repository, articleRepository article.Repository) *MergeMediaUseCase {
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return &MergeMediaUseCase{imageRepository, articleRepository}
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}
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type bodyRewrite struct {
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articleId uint32
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original string
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rewritten string
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}
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func (u *MergeMediaUseCase) Merge(keepId uint32, mergeIds []uint32) (MergeMediaResult, error) {
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if err := validateMergeRequest(keepId, mergeIds); err != nil {
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return MergeMediaResult{}, err
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}
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kept, err := u.imageRepository.Get(keepId)
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if err != nil {
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return MergeMediaResult{}, err
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}
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copies, err := u.loadCopies(kept, mergeIds)
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if err != nil {
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return MergeMediaResult{}, err
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}
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rewrites, err := u.planRewrites(kept, copies)
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if err != nil {
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return MergeMediaResult{}, err
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}
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if err := u.applyRewrites(rewrites); err != nil {
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return MergeMediaResult{}, err
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}
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for _, duplicate := range copies {
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if err := u.imageRepository.Delete(duplicate.ID); err != nil {
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return MergeMediaResult{}, err
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}
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}
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return MergeMediaResult{ArticlesUpdated: len(rewrites), Merged: len(copies)}, nil
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}
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func validateMergeRequest(keepId uint32, mergeIds []uint32) error {
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if keepId == 0 || len(mergeIds) == 0 {
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return image.ErrInvalidMergeRequest
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}
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seen := map[uint32]bool{keepId: true}
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for _, id := range mergeIds {
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if id == 0 || seen[id] {
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return image.ErrInvalidMergeRequest
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}
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seen[id] = true
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}
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return nil
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}
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func (u *MergeMediaUseCase) loadCopies(kept image.Image, mergeIds []uint32) ([]image.Image, error) {
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copies := make([]image.Image, 0, len(mergeIds))
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for _, id := range mergeIds {
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duplicate, err := u.imageRepository.Get(id)
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if errors.Is(err, image.ErrImageNotFound) {
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return nil, image.ErrMergeCopyMissing
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}
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if err != nil {
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return nil, err
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}
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if duplicate.SHA256 == "" || duplicate.SHA256 != kept.SHA256 {
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return nil, image.ErrMergeHashMismatch
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}
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copies = append(copies, duplicate)
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}
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return copies, nil
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}
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func (u *MergeMediaUseCase) planRewrites(kept image.Image, copies []image.Image) ([]bodyRewrite, error) {
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keptName := image.StoredName(kept.Path)
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rewritten := map[uint32]*bodyRewrite{}
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for _, duplicate := range copies {
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copyName := image.StoredName(duplicate.Path)
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articles, err := u.articleRepository.FindByBodyContaining(copyName)
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if err != nil {
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return nil, err
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}
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for _, a := range articles {
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plan, ok := rewritten[a.ID]
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if !ok {
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plan = &bodyRewrite{articleId: a.ID, original: a.Body, rewritten: a.Body}
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rewritten[a.ID] = plan
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}
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plan.rewritten = strings.ReplaceAll(plan.rewritten, copyName, keptName)
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}
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}
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plans := make([]bodyRewrite, 0, len(rewritten))
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for _, plan := range rewritten {
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plans = append(plans, *plan)
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}
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slices.SortFunc(plans, func(a, b bodyRewrite) int { return cmp.Compare(a.articleId, b.articleId) })
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return plans, nil
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}
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func (u *MergeMediaUseCase) applyRewrites(rewrites []bodyRewrite) error {
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for applied, plan := range rewrites {
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if _, err := u.articleRepository.UpdateBody(plan.articleId, plan.rewritten); err != nil {
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u.restoreBodies(rewrites[:applied])
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return err
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}
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}
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return nil
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}
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func (u *MergeMediaUseCase) restoreBodies(applied []bodyRewrite) {
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for _, plan := range applied {
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_, _ = u.articleRepository.UpdateBody(plan.articleId, plan.original)
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}
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}
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