package test

import (
	"RenewCMS/internal/domain/article"
	"reflect"
	"slices"
)

var _ article.ListingRepository = &mockArticleRepo{}

type assessedVersion struct {
	inputs  article.Article
	credits []uint32
}

func seoInputsOf(version article.Article) article.Article {
	version.SEO = article.SEOSummary{}
	version.SEOVersion = 0
	version.UpdatedAt = version.UpdatedAt.UTC()
	return version
}

func (m *mockArticleRepo) seoFresh(version article.Article) bool {
	assessed, found := m.assessed[version.ID]
	return found && !version.SEO.Stale() && reflect.DeepEqual(assessed.inputs, seoInputsOf(version)) && slices.Equal(assessed.credits, m.credits[version.ID])
}

func (m *mockArticleRepo) StaleSEO(afterID uint32, limit int) ([]article.Article, error) {
	if err := m.fail.trigger("StaleSEO"); err != nil {
		return nil, err
	}
	stale := []article.Article{}
	for _, id := range m.sortedIds() {
		version := m.articles[id]
		if id <= afterID || m.seoFresh(version) {
			continue
		}
		version.SEO = article.SEOSummary{}
		stale = append(stale, m.withAuthors(version))
		if len(stale) == limit {
			break
		}
	}
	return stale, nil
}

func (m *mockArticleRepo) StoreSEO(records []article.SEORecord) error {
	if err := m.fail.trigger("StoreSEO"); err != nil {
		return err
	}
	if m.assessed == nil {
		m.assessed = map[uint32]assessedVersion{}
	}
	for _, record := range records {
		version, found := m.articles[record.ArticleID]
		if !found {
			continue
		}
		version.SEO = record.Summary
		m.articles[record.ArticleID] = version
		m.assessed[record.ArticleID] = assessedVersion{inputs: seoInputsOf(version), credits: slices.Clone(m.credits[record.ArticleID])}
	}
	return nil
}

func (m *mockArticleRepo) MarkSiteSEOStale(siteID uint32) error {
	for id, version := range m.articles {
		if version.SiteID == siteID {
			delete(m.assessed, id)
		}
	}
	return nil
}

func (m *mockArticleRepo) CountSuggestions(filters article.Filters) (int, error) {
	if err := m.fail.trigger("CountSuggestions"); err != nil {
		return 0, err
	}
	total := 0
	for _, version := range m.articles {
		if mockVisible(version, filters.IsOnline != nil && *filters.IsOnline, filters.VisibleTo) && version.SEO.Status == article.SEOStatusSuggestions {
			total++
		}
	}
	return total, nil
}

func (m *mockArticleRepo) CountSuggestedStories(readable article.StoryFilters) (int, error) {
	m.listCalls++
	if err := m.fail.trigger("CountSuggestedStories"); err != nil {
		return 0, err
	}
	stories := map[uint32]bool{}
	standalone := 0
	for _, version := range m.articles {
		if !mockVisible(version, readable.OnlyOnline, readable.VisibleTo) || version.SEO.Status != article.SEOStatusSuggestions {
			continue
		}
		if version.StoryID == 0 {
			standalone++
			continue
		}
		stories[version.StoryID] = true
	}
	return len(stories) + standalone, nil
}

func mockVisible(version article.Article, onlineOnly bool, visibleTo *uint32) bool {
	if version.IsOnline {
		return true
	}
	if onlineOnly {
		return false
	}
	return visibleTo == nil || version.CreatedBy == *visibleTo
}

func (m *mockArticleRepo) ListVersions(ids []uint32) ([]article.Article, error) {
	m.listCalls++
	if err := m.fail.trigger("ListVersions"); err != nil {
		return nil, err
	}
	found := []article.Article{}
	for _, id := range ids {
		if version, ok := m.articles[id]; ok {
			found = append(found, m.withAuthors(version))
		}
	}
	return found, nil
}

func (m *mockArticleRepo) DeleteStory(storyID uint32) error {
	if err := m.fail.trigger("DeleteStory"); err != nil {
		return err
	}
	deleted := 0
	for id, version := range m.articles {
		if version.StoryID == storyID {
			delete(m.articles, id)
			delete(m.credits, id)
			deleted++
		}
	}
	if deleted == 0 {
		return article.ErrArticleNotFound
	}
	return nil
}