feat(tabs): COD-359 add owner-scoped tab layouts

src/tab-layout-legacy-order.ts

@@ -0,0 +1,81 @@
+/**
+ * @fileoverview Pure compatibility translation between legacy session order and owner tab layouts.
+ */
+
+import { mergeSessionOrder, normalizeSessionOrder } from './session-order.js';
+import {
+  normalizeTabLayout,
+  validateTabLayout,
+  type TabLayout,
+  type TabRef,
+  type TabRefMetadata,
+} from './tab-layout.js';
+
+export interface OwnerOrderProjection {
+  owner: string;
+  ownedIds: readonly string[];
+  order: readonly string[];
+}
+
+export function applyLegacySessionRank(
+  input: TabLayout,
+  requestedOrder: readonly string[],
+  metadata: readonly TabRefMetadata[]
+): TabLayout {
+  const layout = validateTabLayout(input);
+  const requestedRank = new Map(normalizeSessionOrder(requestedOrder).map((id, index) => [id, index]));
+  const sessionMetadata = new Map<string, TabRefMetadata>();
+  for (const item of metadata) {
+    if (item.kind !== 'session' || !item.ownerValid || !item.visible || sessionMetadata.has(item.id)) continue;
+    sessionMetadata.set(item.id, item);
+  }
+
+  const isRanked = (ref: TabRef): boolean =>
+    ref.kind === 'session' && sessionMetadata.has(ref.id) && requestedRank.has(ref.id);
+  const prepare = (ref: TabRef): TabRef => {
+    if (ref.kind !== 'session') return { ...ref };
+    const item = sessionMetadata.get(ref.id);
+    const ownerValidParent = item?.parentSessionId && sessionMetadata.has(item.parentSessionId);
+    return ownerValidParent ? { ...ref, placement: 'manual' } : { ...ref };
+  };
+  const rankContainer = (refs: readonly TabRef[]): TabRef[] => {
+    const ranked = refs
+      .filter(isRanked)
+      .map(prepare)
+      .sort((a, b) => requestedRank.get(a.id)! - requestedRank.get(b.id)!);
+    let rankedIndex = 0;
+    return refs.map((ref) => (isRanked(ref) ? ranked[rankedIndex++] : { ...ref }));
+  };
+
+  const transformed: TabLayout = {
+    ...layout,
+    groups: layout.groups.map((group) => ({ ...group, refs: rankContainer(group.refs) })),
+    ungrouped: rankContainer(layout.ungrouped),
+  };
+  return normalizeTabLayout(transformed, metadata);
+}
+
+export function recomposeGlobalSessionOrder(
+  current: readonly string[],
+  projections: readonly OwnerOrderProjection[],
+  preferred?: readonly string[]
+): string[] {
+  let result = mergeSessionOrder([...(preferred ?? current)], [...current]);
+  for (const projection of projections) {
+    const ownedIds = normalizeSessionOrder(projection.ownedIds);
+    const owned = new Set(ownedIds);
+    const canonical = normalizeSessionOrder(projection.order).filter((id) => owned.has(id));
+    const canonicalSet = new Set(canonical);
+    for (const id of ownedIds) {
+      if (canonicalSet.has(id)) continue;
+      canonicalSet.add(id);
+      canonical.push(id);
+    }
+
+    let canonicalIndex = 0;
+    const recomposed = result.map((id) => (owned.has(id) ? canonical[canonicalIndex++] : id));
+    recomposed.push(...canonical.slice(canonicalIndex));
+    result = normalizeSessionOrder(recomposed);
+  }
+  return result;
+}