From 0bcfe1f7df5c309f8a4ab381a6fd5b772d929542 Mon Sep 17 00:00:00 2001
From: Anhgelus Morhtuuzh <william@herges.fr>
Date: Thu, 2 Oct 2025 22:54:46 +0200
Subject: feat(backend): working pagination

---
 backend/data.go             |  2 ++
 backend/home.go             | 29 ++++++++++++++++++++++++++---
 backend/templates/home.html |  8 +++++---
 3 files changed, 33 insertions(+), 6 deletions(-)

(limited to 'backend')

diff --git a/backend/data.go b/backend/data.go
index f3e8b42..9c30c6b 100644
--- a/backend/data.go
+++ b/backend/data.go
@@ -64,6 +64,8 @@ func (d *data) handleGeneric(w http.ResponseWriter, r *http.Request, name string
 			}
 			return fmt.Sprintf("/assets/%s", path)
 		},
+		"next":   func(i int) int { return i + 1 },
+		"before": func(i int) int { return i - 1 },
 	}).ParseFS(templates, fmt.Sprintf("templates/%s.html", name), "templates/base.html")
 	if err != nil {
 		panic(err)
diff --git a/backend/home.go b/backend/home.go
index 32634a1..43ace8a 100644
--- a/backend/home.go
+++ b/backend/home.go
@@ -1,19 +1,25 @@
 package backend
 
 import (
+	"log/slog"
 	"maps"
 	"net/http"
 	"slices"
+	"strconv"
 	"time"
 
 	"github.com/go-chi/chi/v5"
 )
 
+const maxLogsPerPage = 5
+
 var sortedLogs []*logData
 
 type homeData struct {
 	*data
-	Logs []*logData
+	Logs        []*logData
+	PagesNumber int
+	CurrentPage int
 }
 
 func (h *homeData) SetData(d *data) {
@@ -22,18 +28,35 @@ func (h *homeData) SetData(d *data) {
 
 func HandleHome(r *chi.Mux) {
 	r.Get("/", func(w http.ResponseWriter, r *http.Request) {
+		rawPage := r.URL.Query().Get("page")
+		page := 1
+		if rawPage != "" {
+			var err error
+			page, err = strconv.Atoi(rawPage)
+			if err != nil || page < 1 {
+				slog.Warn("invalid page number", "rawPage", rawPage)
+				w.WriteHeader(http.StatusBadRequest)
+				return
+			}
+		}
 		d := new(homeData)
 		d.data = new(data)
 		if sortedLogs == nil {
 			sortLogs()
 		}
-		d.Logs = sortedLogs
+		d.CurrentPage = page
+		d.PagesNumber = len(sortedLogs)/maxLogsPerPage + 1
+		if d.PagesNumber < page {
+			http.NotFoundHandler().ServeHTTP(w, r)
+			return
+		}
+		d.Logs = sortedLogs[(page-1)*maxLogsPerPage : min(page*maxLogsPerPage, len(sortedLogs))]
 		d.handleGeneric(w, r, "home", d)
 	})
 }
 
 func sortLogs() {
-	slices.SortedFunc(maps.Values(logs), func(l *logData, l2 *logData) int {
+	sortedLogs = slices.SortedFunc(maps.Values(logs), func(l *logData, l2 *logData) int {
 		lt := l.pubDate.AsTime(time.UTC)
 		l2t := l2.pubDate.AsTime(time.UTC)
 		// we want it reversed
diff --git a/backend/templates/home.html b/backend/templates/home.html
index f0b9b9c..37236ba 100644
--- a/backend/templates/home.html
+++ b/backend/templates/home.html
@@ -18,10 +18,12 @@
         </p>
     </article>
     {{ end }}
+    {{ if ne .PagesNumber 1 }}
     <div class="pagination">
-        <a href="">Précédent</a>
-        <p>01/15</p>
-        <a href="">Suivant</a>
+        {{ if ne .CurrentPage 1 }}<a href="?page={{ before .CurrentPage }}">Précédent</a>{{else}}<p></p>{{end}}
+        <p>{{ .CurrentPage }}/{{ .PagesNumber }}</p>
+        {{ if ne .CurrentPage .PagesNumber }}<a href="?page={{ next .CurrentPage }}">Suivant</a>{{else}}<p></p>{{end}}
     </div>
+    {{ end }}
 </article>
 {{end}}
\ No newline at end of file
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