From 59679b96eea7287ab6f8a8134cf5313b0c99ec53 Mon Sep 17 00:00:00 2001
From: Jonas Bengtsson <jonas.bengtsson@vivab.info>
Date: Sun, 4 Oct 2026 14:15:07 +0200
Subject: [PATCH] =?UTF-8?q?=F0=9F=9A=A7=20WIP?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/wago_sim/webui/static/app.js     | 50 ++++++++++++++++++++++++++--
 src/wago_sim/webui/static/index.html |  4 +--
 src/wago_sim/webui/static/login.html |  2 +-
 src/wago_sim/webui/static/style.css  | 13 ++++++++
 4 files changed, 64 insertions(+), 5 deletions(-)

diff --git a/src/wago_sim/webui/static/app.js b/src/wago_sim/webui/static/app.js
index 6e3f238..631c043 100644
--- a/src/wago_sim/webui/static/app.js
+++ b/src/wago_sim/webui/static/app.js
@@ -528,7 +528,12 @@ async function renderConfig() {
   renderNameEditor();
   const list = document.getElementById("module-list");
   list.innerHTML = mc.modules.map((m, i) => `
-    <label class="module-row">
+    <label class="module-row" draggable="true"
+           ondragstart="dragStart(event, ${i})"
+           ondragover="dragOver(event, ${i})"
+           ondrop="drop(event, ${i})"
+           ondragend="dragEnd()">
+      <span class="drag-handle" title="Drag to rearrange">&#9776;</span>
       <input type="radio" name="mod" value="${i}">
       <b>${i}</b>&nbsp; ${m.article} — ${m.description}
       <span class="mod-io">${m.input_bits ? m.input_bits + " DI" : ""}
@@ -643,7 +648,12 @@ function renderModuleRows() {
   // local edit view until SAVE CONFIG is pressed
   const list = document.getElementById("module-list");
   list.innerHTML = MODULE_ARTICLES.map((a, i) => `
-    <label class="module-row">
+    <label class="module-row" draggable="true"
+           ondragstart="dragStart(event, ${i})"
+           ondragover="dragOver(event, ${i})"
+           ondrop="drop(event, ${i})"
+           ondragend="dragEnd()">
+      <span class="drag-handle" title="Drag to rearrange">&#9776;</span>
       <input type="radio" name="mod" value="${i}">
       <b>${i}</b>&nbsp; ${a}
       <span class="row-buttons">
@@ -666,6 +676,42 @@ async function moveModule(index, delta) {
   await saveModules();
 }
 
+// -- drag-and-drop reordering (FR-11.2.6) ----------------
+
+let DRAG_FROM = null;
+
+function dragStart(ev, index) {
+  DRAG_FROM = index;
+  ev.dataTransfer.effectAllowed = "move";
+  ev.dataTransfer.setData("text/plain", String(index));
+  ev.currentTarget.classList.add("dragging");
+}
+
+function dragOver(ev, index) {
+  if (DRAG_FROM === null || DRAG_FROM === index) return;
+  ev.preventDefault();                     // allow the drop
+  ev.dataTransfer.dropEffect = "move";
+  ev.currentTarget.classList.add("drop-target");
+}
+
+async function drop(ev, index) {
+  ev.preventDefault();
+  ev.currentTarget.classList.remove("drop-target");
+  if (DRAG_FROM === null || DRAG_FROM === index) return;
+  // move the dragged module to the drop position (splice semantics:
+  // remove, then insert at the target index)
+  const [moved] = MODULE_ARTICLES.splice(DRAG_FROM, 1);
+  MODULE_ARTICLES.splice(index, 0, moved);
+  DRAG_FROM = null;
+  await saveModules();                    // rebuild + persist, like arrows
+}
+
+function dragEnd() {
+  DRAG_FROM = null;
+  document.querySelectorAll(".module-row").forEach((el) =>
+    el.classList.remove("dragging", "drop-target"));
+}
+
 // ---------------- tabs ----------------
 
 document.querySelectorAll(".tab").forEach((btn) => {
diff --git a/src/wago_sim/webui/static/index.html b/src/wago_sim/webui/static/index.html
index 4f3cd62..f41e3b0 100644
--- a/src/wago_sim/webui/static/index.html
+++ b/src/wago_sim/webui/static/index.html
@@ -4,7 +4,7 @@
 <meta charset="utf-8">
 <title>WAGO 750-362 Simulator</title>
 <meta name="viewport" content="width=device-width, initial-scale=1">
-<link rel="stylesheet" href="/static/style.css?v=2">
+<link rel="stylesheet" href="/static/style.css?v=3">
 </head>
 <body>
 <header class="topbar">
@@ -111,6 +111,6 @@
   </section>
 </main>
 
-<script src="/static/app.js?v=2"></script>
+<script src="/static/app.js?v=3"></script>
 </body>
 </html>
\ No newline at end of file
diff --git a/src/wago_sim/webui/static/login.html b/src/wago_sim/webui/static/login.html
index f1d8148..1a067f3 100644
--- a/src/wago_sim/webui/static/login.html
+++ b/src/wago_sim/webui/static/login.html
@@ -4,7 +4,7 @@
 <meta charset="utf-8">
 <title>WAGO Simulator — Login</title>
 <meta name="viewport" content="width=device-width, initial-scale=1">
-<link rel="stylesheet" href="/static/style.css?v=2">
+<link rel="stylesheet" href="/static/style.css?v=3">
 </head>
 <body class="login-body">
 <div class="login-card">
diff --git a/src/wago_sim/webui/static/style.css b/src/wago_sim/webui/static/style.css
index c1669e6..0afb016 100644
--- a/src/wago_sim/webui/static/style.css
+++ b/src/wago_sim/webui/static/style.css
@@ -267,6 +267,19 @@ button.mini {
 }
 button.mini:hover:not(:disabled) { background: #dce7f2; }
 button.mini:disabled { opacity: 0.35; cursor: default; }
+
+/* drag-and-drop reordering (FR-11.2.6) */
+.drag-handle {
+  cursor: grab; color: #9aa4ae; font-size: 0.9rem;
+  padding: 0 3px; user-select: none;
+}
+.drag-handle:hover { color: #0062c4; }
+.module-row.dragging { opacity: 0.45; }
+.module-row.drop-target {
+  border-color: #0062c4 !important;
+  box-shadow: inset 0 2px 0 #0062c4;   /* insertion marker: line on top edge */
+}
+.module-row[draggable="true"] { cursor: default; }
 #catalog-pick { padding: 6px; border: 1px solid #c5ccd4; border-radius: 4px; flex: 1; }
 .cfg-path { font-size: 0.75rem; color: #6b7684; align-self: center; }
 button.primary { background: #2e7d32; }