1 files changed, 129 insertions, 0 deletions
diff --git a/internal/router/handlers/lang-blog.go b/internal/router/handlers/lang-blog.go
new file mode 100644
index 0000000..c31c2eb
--- /dev/null
+++ b/internal/router/handlers/lang-blog.go
@@ -0,0 +1,129 @@
+package handlers
+
+import (
+	"fmt"
+	"log/slog"
+	"net/url"
+	"regexp"
+	"slices"
+	"strings"
+	"time"
+
+	"github.com/SayaAndy/saya-today-web/internal/blog"
+	"github.com/SayaAndy/saya-today-web/internal/router"
+	"github.com/SayaAndy/saya-today-web/l10n"
+	"github.com/gofiber/fiber/v2"
+)
+
+func init() {
+	router.Routes = append(router.Routes, &CatalogueHandler{getTagsQuery: regexp.MustCompile(`tags\[\]=([\w]+)`)})
+}
+
+type CatalogueHandler struct {
+	router.BasicHandler
+	getTagsQuery *regexp.Regexp
+}
+
+func (r *CatalogueHandler) Filter() (method string, path string) {
+	return "GET", "/:lang/blog"
+}
+
+func (r *CatalogueHandler) IsTemplated() bool {
+	return true
+}
+
+func (r *CatalogueHandler) TemplatesToInject() []string {
+	return []string{"views/pages/blog-catalogue.html"}
+}
+
+func (r *CatalogueHandler) ToCache() router.CacheSetting {
+	return router.ByUrlAndQuery
+}
+
+func (r *CatalogueHandler) CacheDuration() time.Duration {
+	return 5 * time.Minute
+}
+
+func (r *CatalogueHandler) ToValidateLang() router.LangSetting {
+	return router.InPath
+}
+
+func (r *CatalogueHandler) SitemapInfo(supplements *router.Supplements) []router.SitemapInfo {
+	sitemapInfo := []router.SitemapInfo{}
+	for _, lang := range supplements.AvailableLanguages {
+		sitemapInfo = append(sitemapInfo, router.SitemapInfo{Loc: "/" + lang.Name + "/blog", Priority: 0.3})
+	}
+	return sitemapInfo
+}
+
+func (r *CatalogueHandler) AddMeta(c *fiber.Ctx, supplements *router.Supplements, lang string, templateMap fiber.Map) (meta []router.MetaField, err error) {
+	return []router.MetaField{
+		{Property: "og:title", Content: l10n.T.GetPath(lang, "BlogSearch", "Header").(string)},
+		{Property: "og:description", Content: l10n.T.GetPath(lang, "BlogSearch", "Description").(string)},
+		{Property: "og:url", Content: fmt.Sprintf("%s/%s/blog", templateMap["CanonicalEndpoint"], lang)},
+		{Property: "og:type", Content: "website"},
+	}, nil
+}
+
+func (r *CatalogueHandler) RenderBody(c *fiber.Ctx, supplements *router.Supplements, lang string, templateMap fiber.Map) (statusCode int, err error) {
+	querySort := c.Query("sort", "publicationDateDesc")
+	previousBlogPage := c.Query("codename")
+
+	encodedQuery := c.Request().URI().QueryString()
+	decodedQuery, _ := url.QueryUnescape(string(encodedQuery))
+	matches := r.getTagsQuery.FindAllStringSubmatch(decodedQuery, -1)
+
+	queryTags := make([]string, 0, len(matches))
+	for _, match := range matches {
+		queryTags = append(queryTags, string(match[1]))
+	}
+
+	tagsArray, err := getTags(supplements.BlogClient, lang)
+	if err != nil {
+		return fiber.StatusInternalServerError, fmt.Errorf("failed to get the available tags")
+	}
+
+	templateMap["Tags"] = tagsArray
+	templateMap["QuerySort"] = querySort
+	templateMap["QueryTags"] = strings.Join(queryTags, ",")
+	templateMap["Title"] = l10n.T.GetPath(lang, "BlogSearch", "Header").(string)
+	templateMap["PreviousBlogPage"] = previousBlogPage
+
+	return fiber.StatusOK, nil
+}
+
+func (r *CatalogueHandler) RenderHeader(c *fiber.Ctx, supplements *router.Supplements, lang string, templateMap fiber.Map) (statusCode int, err error) {
+	templateMap["Title"] = l10n.T.GetPath(lang, "BlogSearch", "Header").(string)
+	return fiber.StatusOK, nil
+}
+
+type Tag struct {
+	Name  string `json:"Name" yaml:"name"`
+	Count int    `json:"Count" yaml:"count"`
+}
+
+func getTags(blogClient blog.Client, lang string) (tags []Tag, err error) {
+	pages, err := blogClient.Scan(lang + "/")
+	if err != nil {
+		slog.Warn("failed to scan pages via b2", slog.String("error", err.Error()))
+		return nil, fmt.Errorf("failed to scan pages via b2: %w", err)
+	}
+
+	tagsMap := make(map[string]int)
+	for _, page := range pages {
+		for _, tag := range page.Metadata.Tags {
+			tagsMap[tag]++
+		}
+	}
+	slog.Debug("enlist pages for catalogue", slog.Int("tag_count", len(tagsMap)), slog.Int("page_count", len(pages)), slog.String("lang", lang))
+
+	tagsArray := make([]Tag, 0, len(tagsMap))
+	for tag, count := range tagsMap {
+		tagsArray = append(tagsArray, Tag{tag, count})
+	}
+	slices.SortFunc(tagsArray, func(a Tag, b Tag) int {
+		return strings.Compare(a.Name, b.Name)
+	})
+
+	return tagsArray, nil
+}