3 files changed, 102 insertions, 4 deletions

diff --git a/assets_src/js/list.js b/assets_src/js/list.js
index 8246950..b3541e0 100644
--- a/assets_src/js/list.js
+++ b/assets_src/js/list.js
@@ -19,18 +19,36 @@ async function resultClicked(grilId) {
         document.getElementById('gril-list').innerHTML += response;
 }
 
-function listButtonHandler(e) {
+async function updateGrilOrder(gril, pos) {
+    return await ajax.post(
+        `${window.location}/order`,
+        `gril=${gril}&pos=${pos}`,
+        { headers: {
+            'Content-Type': 'application/x-www-form-urlencoded',
+        } });
+}
+
+async function listButtonHandler(e) {
         let liFilter = x => x.tagName && x.tagName.toLowerCase() === 'li';
         let item = dom.closest(e.target, liFilter);
         let pItem = dom.previous(item, liFilter),
             nItem = dom.next(dom.next(item, liFilter), liFilter);
         switch (e.target.classList[0]) {
         case 'gril-sort-up':
-                //TODO: backend
+        try {
+            await updateGrilOrder(item.id, -1);
+        } catch(e) {
+            alert(e.message);
+        }
                 item.parentNode.insertBefore(item, pItem);
                 break;
         case 'gril-sort-down':
-                //TODO: backend
+        try {
+            await updateGrilOrder(item.id, 1);
+        } catch(e) {
+            alert(e.message);
+        }
+        
                 if (nItem) {
                         item.parentNode.insertBefore(item, nItem);
                 } else {
diff --git a/modules/lists/lists.go b/modules/lists/lists.go
index ec29ea8..b40ee18 100644
--- a/modules/lists/lists.go
+++ b/modules/lists/lists.go
@@ -67,6 +67,7 @@ func (m *Module) Init(g *grilist.Grilist) {
         }
         m.grils = grilsModule
         m.g.Router.GET("/list/:id", m.viewList)
+    m.g.Router.POST("/list/:id/order", m.updateGrilOrder)
         m.g.Router.POST("/list/:id", m.addGrilToList)
         m.g.Router.GET("/new/list", m.displayCreateList)
         m.g.Router.POST("/new/list", m.createList)
@@ -341,6 +342,85 @@ func (m *Module) createList(w http.ResponseWriter, r *http.Request, p httprouter
         http.Redirect(w, r, fmt.Sprintf("/list/%d", id), 302)
 }
 
+func (m *Module) updateGrilOrder(w http.ResponseWriter, r *http.Request, p httprouter.Params) {
+        slistID := p.ByName("id")
+    
+    user, err := m.g.Charakterin.GetUserFromRequest(r)
+        if err != nil {
+                http.Error(w, "403", http.StatusForbidden)
+                return
+        }
+
+        listID, err := strconv.Atoi(slistID)
+        if err != nil {
+                http.Error(w, "invalid list ID (type mismatch)", 400)
+                return
+        }
+
+        values, err := readBody(r)
+        if err != nil {
+                http.Error(w, "invalid POST data", 400)
+                return
+        }
+
+        grilID, err := strconv.Atoi(values.Get("gril"))
+        if err != nil {
+                http.Error(w, "invalid gril ID", 404)
+                return
+        }
+    
+    diff, err := strconv.Atoi(values.Get("pos"))
+    if err != nil {
+        http.Error(w, "invalid position diff", 400)
+        return
+    }
+
+        list, err := m.FromID(listID)
+        if err != nil {
+                http.Error(w, "invalid list", 404)
+                return
+        }
+
+        // find the gril in our list
+    var lgril *ListGril = nil
+    log.Println(list.Grils)
+    for _, g := range list.Grils {
+        if g.Gril.ID == grilID {
+            lgril = g
+            break
+        }
+    }
+    if lgril == nil {
+        http.Error(w, "gril not found in the list", 404)
+        return
+    }
+    
+    newPos := lgril.Order + diff
+    
+    if newPos < 0 {
+        newPos = 0
+    } else if newPos >= len(list.Grils) {
+        newPos = len(list.Grils) - 1
+    }
+    
+    if newPos == lgril.Order {
+        http.Error(w, "no change in order", 400)
+        return
+    }
+
+        // rein in die DB damit
+        _, err = m.g.DB.Query(`SELECT grilist.set_gril_order($1, $2, $3, $4)`, user.ID, listID, grilID, newPos)
+        if err != nil {
+                log.Println("error reordering gril:", err)
+                http.Error(w, "could not update gril order", 500)
+                return
+        }
+
+    w.WriteHeader(200)
+    w.Write([]byte("ok"))
+        return
+}
+
 // New erstellt eine neue Instanz des Modules
 func New() *Module {
         return &Module{}
diff --git a/views/includes/list_gril.html b/views/includes/list_gril.html
index 57694aa..4b5e55c 100644
--- a/views/includes/list_gril.html
+++ b/views/includes/list_gril.html
@@ -1,5 +1,5 @@
 {{ define "list_gril" }}
-<li id="{{ .Index }}">
+<li id="{{ .Value.Gril.Gril.ID }}">
         <div class="card-panel hoverable list-entry">
                 <div class="row valign-wrapper">
                         <div class="col s3 m2 {{ if not .Value.IsListOwner }}offset-s1 offset-m1{{ end }}">