feat(web): filter sidebar threads by environment

apps/web/src/components/Sidebar.logic.test.ts

@@ -9,6 +9,7 @@ import {
   createThreadJumpHintVisibilityController,
   filterSidebarProjectScopeItems,
   getSidebarThreadIdsToPrewarm,
+  pruneDisabledEnvironmentIds,
   resolveAdjacentThreadId,
   reduceSidebarProjectScopeMenuState,
   getFallbackThreadIdAfterDelete,
@@ -37,6 +38,7 @@ import {
   sortScopedProjectsForSidebar,
   shouldCreateNewThreadInCurrentProject,
   THREAD_JUMP_HINT_SHOW_DELAY_MS,
+  toggleDisabledEnvironmentId,
 } from "./Sidebar.logic";
 import {
   EnvironmentId,
@@ -1652,3 +1654,116 @@ describe("sortLogicalProjectsForSidebar", () => {
     ).toEqual(["logical-newer", "logical-older"]);
   });
 });
+
+describe("toggleDisabledEnvironmentId", () => {
+  const envA = EnvironmentId.make("env-a");
+  const envB = EnvironmentId.make("env-b");
+  const all = [envA, envB];
+
+  it("disables an environment", () => {
+    const next = toggleDisabledEnvironmentId({
+      disabledIds: new Set(),
+      environmentId: envA,
+      enabled: false,
+      allEnvironmentIds: all,
+    });
+    expect([...next]).toEqual([envA]);
+  });
+
+  it("re-enables a disabled environment", () => {
+    const next = toggleDisabledEnvironmentId({
+      disabledIds: new Set([envA]),
+      environmentId: envA,
+      enabled: true,
+      allEnvironmentIds: all,
+    });
+    expect(next.size).toBe(0);
+  });
+
+  it("refuses to disable the last enabled environment", () => {
+    const current: ReadonlySet<EnvironmentId> = new Set([envA]);
+    const next = toggleDisabledEnvironmentId({
+      disabledIds: current,
+      environmentId: envB,
+      enabled: false,
+      allEnvironmentIds: all,
+    });
+    expect(next).toBe(current);
+  });
+
+  it("returns the same instance when disabling an already-disabled environment", () => {
+    const current: ReadonlySet<EnvironmentId> = new Set([envA]);
+    const next = toggleDisabledEnvironmentId({
+      disabledIds: current,
+      environmentId: envA,
+      enabled: false,
+      allEnvironmentIds: all,
+    });
+    expect(next).toBe(current);
+  });
+
+  it("returns the same instance when enabling an already-enabled environment", () => {
+    const current: ReadonlySet<EnvironmentId> = new Set([envB]);
+    const next = toggleDisabledEnvironmentId({
+      disabledIds: current,
+      environmentId: envA,
+      enabled: true,
+      allEnvironmentIds: all,
+    });
+    expect(next).toBe(current);
+  });
+});
+
+describe("pruneDisabledEnvironmentIds", () => {
+  const envA = EnvironmentId.make("env-a");
+  const envB = EnvironmentId.make("env-b");
+  const envC = EnvironmentId.make("env-c");
+
+  it("returns the same instance when nothing is disabled", () => {
+    const current: ReadonlySet<EnvironmentId> = new Set();
+    expect(
+      pruneDisabledEnvironmentIds({
+        disabledIds: current,
+        connectedEnvironmentIds: new Set([envA]),
+      }),
+    ).toBe(current);
+  });
+
+  it("drops disabled environments that left the catalog", () => {
+    const next = pruneDisabledEnvironmentIds({
+      disabledIds: new Set([envA, envC]),
+      connectedEnvironmentIds: new Set([envA, envB]),
+    });
+    expect([...next]).toEqual([envA]);
+  });
+
+  it("returns the same instance when every disabled environment is still connected", () => {
+    const current: ReadonlySet<EnvironmentId> = new Set([envA]);
+    expect(
+      pruneDisabledEnvironmentIds({
+        disabledIds: current,
+        connectedEnvironmentIds: new Set([envA, envB]),
+      }),
+    ).toBe(current);
+  });
+
+  it("returns all-enabled for the render where the last enabled environment disconnects", () => {
+    // envB (the only enabled environment) disconnected; keeping envA disabled
+    // would hide every thread while the filter button no longer renders.
+    const current = new Set<EnvironmentId>([envA]);
+    const next = pruneDisabledEnvironmentIds({
+      disabledIds: current,
+      connectedEnvironmentIds: new Set([envA]),
+    });
+    expect(next).not.toBe(current);
+    expect(next.size).toBe(0);
+  });
+
+  it("clears the filter when the catalog is empty", () => {
+    const next = pruneDisabledEnvironmentIds({
+      disabledIds: new Set([envA]),
+      connectedEnvironmentIds: new Set(),
+    });
+    expect(next.size).toBe(0);
+  });
+});

apps/web/src/components/Sidebar.logic.ts

@@ -1,6 +1,6 @@
 import * as React from "react";
 import { defaultAnimateLayoutChanges, type AnimateLayoutChanges } from "@dnd-kit/sortable";
-import type { ContextMenuItem } from "@t3tools/contracts";
+import type { ContextMenuItem, EnvironmentId } from "@t3tools/contracts";
 import type { SidebarProjectSortOrder, SidebarThreadSortOrder } from "@t3tools/contracts/settings";
 import {
   activeThreadAnchorTimestampMs,
@@ -960,3 +960,49 @@ export function sortScopedProjectsForSidebar<
       left.id.localeCompare(right.id),
   );
 }
+
+// --- Sidebar environment filter --------------------------------------------
+// The filter stores the DISABLED environments so a newly connected
+// environment is visible by default and "all enabled" is the empty set. Both
+// helpers return the input set instance when nothing changed so React state
+// setters can skip the update entirely.
+
+export function toggleDisabledEnvironmentId(input: {
+  disabledIds: ReadonlySet<EnvironmentId>;
+  environmentId: EnvironmentId;
+  enabled: boolean;
+  allEnvironmentIds: ReadonlyArray<EnvironmentId>;
+}): ReadonlySet<EnvironmentId> {
+  if (input.disabledIds.has(input.environmentId) !== input.enabled) {
+    // Already in the requested state (repeated or stale checkbox event):
+    // keep the instance so the caller's state update is a no-op.
+    return input.disabledIds;
+  }
+  const next = new Set(input.disabledIds);
+  if (input.enabled) {
+    next.delete(input.environmentId);
+    return next;
+  }
+  next.add(input.environmentId);
+  // Never allow disabling the last enabled environment: an empty thread list
+  // with no visible reason reads as data loss. (The menu also disables the
+  // last enabled item; this guards races and stale events.)
+  const someEnabled = input.allEnvironmentIds.some((id) => !next.has(id));
+  return someEnabled ? next : input.disabledIds;
+}
+
+export function pruneDisabledEnvironmentIds(input: {
+  disabledIds: ReadonlySet<EnvironmentId>;
+  connectedEnvironmentIds: ReadonlySet<EnvironmentId>;
+}): ReadonlySet<EnvironmentId> {
+  const { connectedEnvironmentIds, disabledIds } = input;
+  if (disabledIds.size === 0) return disabledIds;
+  const next = new Set([...disabledIds].filter((id) => connectedEnvironmentIds.has(id)));
+  // A catalog change can strand the filter with nothing enabled (the last
+  // enabled environment disconnected) — and on single-environment catalogs
+  // the filter button no longer renders, so nothing could undo it. Reset to
+  // all-enabled instead of hiding every thread.
+  const someEnabled = [...connectedEnvironmentIds].some((id) => !next.has(id));
+  if (!someEnabled) return new Set<EnvironmentId>();
+  return next.size === disabledIds.size ? disabledIds : next;
+}