feat(uns): GlobalUns page with browsable tree

src/Server/ZB.MOM.WW.OtOpcUa.AdminUI/Components/Pages/Uns/GlobalUns.razor

@@ -0,0 +1,129 @@
+@page "/uns"
+@attribute [Microsoft.AspNetCore.Authorization.Authorize]
+@rendermode RenderMode.InteractiveServer
+@using ZB.MOM.WW.OtOpcUa.AdminUI.Uns
+@using ZB.MOM.WW.OtOpcUa.AdminUI.Components.Shared.Uns
+@inject IUnsTreeService Svc
+
+<div class="d-flex justify-content-between align-items-center mb-3">
+    <h4 class="mb-0">UNS</h4>
+    <span class="text-muted small">Changes apply on the next deployment.</span>
+</div>
+
+<section class="panel rise" style="animation-delay:.02s">
+    <div class="panel-head d-flex justify-content-between align-items-center flex-wrap gap-2">
+        <span>Unified namespace</span>
+        <div class="d-flex align-items-center gap-2 flex-wrap">
+            <input type="text" class="form-control form-control-sm" style="max-width:240px"
+                   placeholder="Filter by name (substring)…"
+                   @bind="_filter" @bind:event="oninput" />
+            <button type="button" class="btn btn-outline-secondary btn-sm" @onclick="ExpandAll">Expand all</button>
+            <button type="button" class="btn btn-outline-secondary btn-sm" @onclick="CollapseAll">Collapse all</button>
+            <button type="button" class="btn btn-outline-primary btn-sm" disabled>Import equipment CSV</button>
+        </div>
+    </div>
+
+    @if (_loading)
+    {
+        <div style="padding:1rem" class="text-muted">
+            <span class="spinner-border spinner-border-sm me-1"></span>Loading…
+        </div>
+    }
+    else if (_roots.Count == 0)
+    {
+        <div style="padding:1rem" class="text-muted">No clusters yet.</div>
+    }
+    else
+    {
+        <div style="padding:.5rem 1rem">
+            <UnsTree Roots="_roots" Filter="_filter" OnToggleExpand="ToggleAsync" />
+        </div>
+    }
+</section>
+
+@code {
+    private IReadOnlyList<UnsNode> _roots = Array.Empty<UnsNode>();
+    private string? _filter;
+    private bool _loading = true;
+
+    protected override async Task OnInitializedAsync()
+    {
+        _roots = await Svc.LoadStructureAsync();
+        _loading = false;
+    }
+
+    /// <summary>
+    /// Toggles a node's expansion. For equipment nodes whose children have not yet
+    /// been loaded, lazily fetches the tag/virtual-tag leaves on first expand.
+    /// </summary>
+    private async Task ToggleAsync(UnsNode node)
+    {
+        node.Expanded = !node.Expanded;
+
+        if (node.Kind == UnsNodeKind.Equipment && node.Expanded && !node.Loaded)
+        {
+            node.Loading = true;
+            StateHasChanged();
+            try
+            {
+                var kids = await Svc.LoadEquipmentChildrenAsync(node.EntityId!);
+                node.Children.Clear();
+                node.Children.AddRange(kids);
+                node.Loaded = true;
+            }
+            catch (Exception ex)
+            {
+                node.Error = ex.Message;
+            }
+            finally
+            {
+                node.Loading = false;
+                StateHasChanged();
+            }
+        }
+    }
+
+    /// <summary>
+    /// Expands every structural node (Enterprise/Cluster/Area/Line). Equipment nodes
+    /// are intentionally left collapsed because expanding them would trigger lazy loads.
+    /// </summary>
+    private void ExpandAll()
+    {
+        foreach (var root in _roots)
+        {
+            ExpandStructural(root);
+        }
+    }
+
+    private static void ExpandStructural(UnsNode node)
+    {
+        if (node.Kind is UnsNodeKind.Enterprise or UnsNodeKind.Cluster
+            or UnsNodeKind.Area or UnsNodeKind.Line)
+        {
+            node.Expanded = true;
+        }
+
+        foreach (var child in node.Children)
+        {
+            ExpandStructural(child);
+        }
+    }
+
+    /// <summary>Collapses every node in the tree.</summary>
+    private void CollapseAll()
+    {
+        foreach (var root in _roots)
+        {
+            CollapseNode(root);
+        }
+    }
+
+    private static void CollapseNode(UnsNode node)
+    {
+        node.Expanded = false;
+        foreach (var child in node.Children)
+        {
+            CollapseNode(child);
+        }
+    }
+}