Add navigation

internal/database/articles.go

@@ -133,3 +133,43 @@ func ArticleByID(store *Store, ID int, slug string) (article model.DisplayArticl
 
 	return result, nil
 }
+
+func PreviousAndNextArticleUrlByID(store *Store, ID int) (nextUrl string, previousUrl string, err error) {
+
+	nextResult, previousResult := "#", "#"
+	query, err := store.Prepare(`
+     select id,title, content, slug, original_url, source_id, created_at from articles where id = $1;
+		 `)
+	if err != nil {
+		return nextResult, previousResult, err
+	}
+	defer query.Close()
+
+	row := query.QueryRow(ID - 1)
+	if err != nil {
+		return nextResult, previousResult, err
+	}
+
+	r := model.DisplayArticle{}
+	content := ""
+	err = row.Scan(&r.ID, &r.Title, &content, &r.Slug, &r.OriginalUrl, &r.SourceId, &r.CreatedAt)
+	if err != nil {
+		return nextResult, previousResult, err
+	}
+
+	previousResult = fmt.Sprintf("/%d/%s", r.ID, r.Slug)
+
+	row = query.QueryRow(ID + 1)
+	if err != nil {
+		return nextResult, previousResult, err
+	}
+
+	content = ""
+	err = row.Scan(&r.ID, &r.Title, &content, &r.Slug, &r.OriginalUrl, &r.SourceId, &r.CreatedAt)
+	if err != nil {
+		return nextResult, previousResult, err
+	}
+	nextResult = fmt.Sprintf("/%d/%s", r.ID, r.Slug)
+
+	return nextResult, previousResult, nil
+}

internal/server/articles.go

@@ -1,6 +1,7 @@
 package server
 
 import (
+	"fmt"
 	"github.com/gorilla/mux"
 	"gitlab.com/kbr4/svevijesti/internal/database"
 	"net/http"
@@ -21,9 +22,51 @@ func rootHandler(wr http.ResponseWriter, req *http.Request) {
 		http.Error(wr, err.Error(), http.StatusInternalServerError)
 	}
 
+	dayBefore := "/dan/" + time.Now().Add(-24*time.Hour).Format("2006-01-02")
+
 	data := map[string]interface{}{
 		"title":    title,
 		"articles": articles,
+		"previous": dayBefore,
+		"next":     "/",
+	}
+
+	err = templates.ExecuteTemplate(wr, "homeHTML", data)
+	if err != nil {
+		http.Error(wr, err.Error(), http.StatusInternalServerError)
+	}
+}
+
+func dailyArticlesHandler(wr http.ResponseWriter, req *http.Request) {
+	vars := mux.Vars(req)
+	day, err := time.Parse("2006-01-02", vars["date"])
+	if err != nil {
+		http.Error(wr, err.Error(), http.StatusNotFound)
+	}
+	dayBefore := "/dan/" + day.Add(-24*time.Hour).Format("2006-01-02")
+	dayAfter := "/dan/" + day.Add(24*time.Hour).Format("2006-01-02")
+
+	if day.Add(24*time.Hour).Format("2006-01-02") == time.Now().Format("2006-01-02") {
+		dayAfter = "/"
+	}
+
+	title := fmt.Sprintf("Stare novine na dan %s", day.Format("2006-01-02"))
+	store, err := database.Connect()
+	if err != nil {
+		http.Error(wr, err.Error(), http.StatusInternalServerError)
+	}
+	defer store.Close()
+
+	articles, err := database.ArticlesForDay(store, day)
+	if err != nil {
+		http.Error(wr, err.Error(), http.StatusInternalServerError)
+	}
+
+	data := map[string]interface{}{
+		"title":    title,
+		"articles": articles,
+		"previous": dayBefore,
+		"next":     dayAfter,
 	}
 
 	err = templates.ExecuteTemplate(wr, "homeHTML", data)
@@ -50,10 +93,14 @@ func articleHandler(wr http.ResponseWriter, req *http.Request) {
 		http.Error(wr, err.Error(), http.StatusNotFound)
 	}
 
+	next, previous, _ := database.PreviousAndNextArticleUrlByID(store, articleID)
+
 	title := article.Title
 	data := map[string]interface{}{
-		"title":   title,
-		"article": article,
+		"title":    title,
+		"article":  article,
+		"previous": previous,
+		"next":     next,
 	}
 
 	err = templates.ExecuteTemplate(wr, "articleHTML", data)

internal/server/server.go

@@ -39,7 +39,8 @@ func init() {
 
 func CreateRoutes() *mux.Router {
 	r := mux.NewRouter()
-	r.HandleFunc("/", rootHandler)
+	r.HandleFunc("/dan/{date}", dailyArticlesHandler)
 	r.HandleFunc("/{id:[0-9]+}/{slug}", articleHandler)
+	r.HandleFunc("/", rootHandler)
 	return r
 }

web/data/footer.html

@@ -2,5 +2,12 @@
 
 <footer>
 SN
+<div>
+   <nav>
+        <a href="{{.previous}}">&lt;----</a> | 
+        <a href="/">Početna</a> | 
+        <a href="{{.next}}">----&gt;</a> 
+    </nav>
+</div>
 </footer>
 {{end}}

web/data/header.html

@@ -12,7 +12,9 @@
   </pre>
     <br>
     <nav>
-        <a href="/">Početna</a>
+        <a href="{{.previous}}">&lt;----</a> | 
+        <a href="/">Početna</a> | 
+        <a href="{{.next}}">----&gt;</a> 
     </nav>
 </header>
 {{end}}

web/tpl/dailyArticles.html

@@ -0,0 +1,12 @@
+{{define "homeHTML"}}
+
+{{template "headHTML" .}}
+<body>
+{{template "headerHTML" .}}
+
+{{template "articlesHTML" .}}
+
+{{template "footerHTML" .}}
+</body>
+</html>
+{{end}}