package test

import (
	"RenewCMS/internal/domain/article"
	"encoding/json"
	"net/http"
	"strconv"
	"testing"
)

type mediaListBody struct {
	Items []struct {
		ID     uint32 `json:"id"`
		UsedIn int    `json:"used_in"`
	} `json:"items"`
	Counts struct {
		Unused int `json:"unused"`
	} `json:"counts"`
}

func (e *siteEnv) useImageOnSite(siteID uint32, imageID uint32) {
	s := e.sites.sites[siteID]
	s.DefaultSocialImageID = idPointer(imageID)
	e.sites.sites[siteID] = s
}

func (e *siteEnv) seedDuplicates() {
	e.seedBanner(5, "banner.png", "samehash")
	e.seedBanner(6, "banner-copy.png", "samehash")
}

func TestSitesMediaUsage(t *testing.T) {
	t.Run("An image used as a default social image is counted as used", func(t *testing.T) {
		e := newSiteEnvWithShop(t)
		e.seedBanner(5, "banner.png", "hash")
		e.useImageOnSite(siteShopID, 5)

		rec := e.owner(t, http.MethodGet, "/v1/media/", "")
		unused := e.owner(t, http.MethodGet, "/v1/media/?filter=unused", "")

		var list, unusedList mediaListBody
		_ = json.Unmarshal(rec.Body.Bytes(), &list)
		_ = json.Unmarshal(unused.Body.Bytes(), &unusedList)
		if len(list.Items) != 1 || list.Items[0].UsedIn != 1 || list.Counts.Unused != 0 || len(unusedList.Items) != 0 {
			t.Errorf("list %s, unused %s", rec.Body.String(), unused.Body.String())
		}
	})

	t.Run("Deleting the image clears the site's field", func(t *testing.T) {
		e := newSiteEnvWithShop(t)
		e.seedBanner(5, "banner.png", "hash")
		e.useImageOnSite(siteShopID, 5)

		rec := e.owner(t, http.MethodDelete, "/v1/media/5", "")

		if rec.Code != http.StatusNoContent || e.sites.sites[siteShopID].DefaultSocialImageID != nil {
			t.Errorf("status %d, image %v", rec.Code, e.sites.sites[siteShopID].DefaultSocialImageID)
		}
	})

	t.Run("A failed image deletion keeps the site's field", func(t *testing.T) {
		e := newSiteEnvWithShop(t)
		e.seedBanner(5, "banner.png", "hash")
		e.useImageOnSite(siteShopID, 5)
		e.images.failDeleteFor = map[uint32]error{5: errRepositoryFailure}

		rec := e.owner(t, http.MethodDelete, "/v1/media/5", "")

		if rec.Code != http.StatusInternalServerError || e.sites.sites[siteShopID].DefaultSocialImageID == nil {
			t.Errorf("status %d, image %v", rec.Code, e.sites.sites[siteShopID].DefaultSocialImageID)
		}
	})

	t.Run("Merging copies repoints the site", func(t *testing.T) {
		e := newSiteEnvWithShop(t)
		e.seedDuplicates()
		e.useImageOnSite(siteShopID, 6)

		rec := e.owner(t, http.MethodPost, "/v1/media/merge", `{"keep_id": 5, "merge_ids": [6]}`)

		var body map[string]int
		_ = json.Unmarshal(rec.Body.Bytes(), &body)
		kept := e.sites.sites[siteShopID].DefaultSocialImageID
		if rec.Code != http.StatusOK || body["sites_updated"] != 1 || kept == nil || *kept != 5 {
			t.Errorf("status %d, body %s, image %v", rec.Code, rec.Body.String(), kept)
		}
	})

	t.Run("Purge repoints sites the same way", func(t *testing.T) {
		e := newSiteEnvWithShop(t)
		e.seedDuplicates()
		e.articles.articles[1] = articleUsingImage(5)
		e.useImageOnSite(siteShopID, 6)

		rec := e.owner(t, http.MethodPost, "/v1/media/purge", "")

		var body map[string]int
		_ = json.Unmarshal(rec.Body.Bytes(), &body)
		kept := e.sites.sites[siteShopID].DefaultSocialImageID
		if rec.Code != http.StatusOK || body["sites_updated"] != 1 || kept == nil || *kept != 5 {
			t.Errorf("status %d, body %s, image %v", rec.Code, rec.Body.String(), kept)
		}
	})

	t.Run("A failed purge group leaves the site pointing at an existing image", func(t *testing.T) {
		e := newSiteEnvWithShop(t)
		e.seedDuplicates()
		e.articles.articles[1] = articleUsingImage(5)
		e.useImageOnSite(siteShopID, 6)
		e.images.failDeleteFor = map[uint32]error{6: errRepositoryFailure}

		rec := e.owner(t, http.MethodPost, "/v1/media/purge", "")

		referenced := e.sites.sites[siteShopID].DefaultSocialImageID
		if rec.Code != http.StatusOK || referenced == nil {
			t.Fatalf("status %d, image %v", rec.Code, referenced)
		}
		if _, exists := e.images.images[*referenced]; !exists {
			t.Errorf("the site points at the missing image %d", *referenced)
		}
	})

	t.Run("The usage lookup stays an array and later gains additive keys", func(t *testing.T) {
		e := newSiteEnvWithShop(t)
		e.seedBanner(5, "banner.png", "hash")
		e.useImageOnSite(siteShopID, 5)
		e.articles.articles[1] = articleUsingImage(5)

		rec := e.owner(t, http.MethodGet, "/v1/media/5/usage", "")

		var items []map[string]any
		if err := json.Unmarshal(rec.Body.Bytes(), &items); err != nil || rec.Code != http.StatusOK || len(items) != 2 {
			t.Fatalf("status %d, body %s", rec.Code, rec.Body.String())
		}
		first := items[0]
		if first["id"] != float64(1) || first["title"] != "Spring release" || first["published"] != true || first["type"] != "article" {
			t.Errorf("the article item lost a key: %v", first)
		}
	})
}

func articleUsingImage(imageID uint32) article.Article {
	return article.Article{ID: 1, Title: "Spring release", Body: `<img src="` + producersBannerPath + strconv.Itoa(int(imageID)) + `.png">`, IsOnline: true, SiteID: siteMainID}
}