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+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * [#22221] Through a REAL `createHonoApp` host, `PUT /meta/:type/:name` honours
+ * `If-Match`, `If-None-Match: *` and `?mode=draft` — the composed-host pin of
+ * #22141's write preconditions.
+ *
+ * ## What this pins
+ *
+ * A host that mounts only `@objectstack/hono`'s `${prefix}/*` catch-all has no
+ * `RestServer`: every `/meta` save goes catch-all → `HttpDispatcher.dispatch()`
+ * → `handleMetadataRequest`'s `PUT` branch, which reads the precondition and
+ * the lifecycle through `metaSaveRequestOptions` (`@objectstack/rest`). That
+ * read sees the request only through what the catch-all hands `dispatch()`:
+ *
+ *  - the two headers ride `{ request: c.req.raw }` — the raw Fetch `Request`,
+ *    read as `context.request.headers`;
+ *  - `?mode` rides the query argument the catch-all flattens from the URL.
+ *
+ * `packages/runtime`'s `meta-save-preconditions-parity.test.ts` holds the
+ * dispatcher's half by repeating the catch-all's statements into `dispatch()`;
+ * it cannot reach the adapter itself (see below). These rows go through
+ * `app.request(...)`, so the adapter's hand-off is in the path: if the
+ * catch-all stopped handing on the raw `Request`, dropped its headers or its
+ * query, the rows here go red. Each row reads the STORE after the request, not
+ * only the answer on the wire.
+ *
+ * The four rows are the card's: a stale `If-Match`, `If-None-Match: *` over an
+ * existing row, `?mode=draft`, and the unguarded control.
+ *
+ * ## ⚠️ Why this lives HERE and not in `packages/adapters/hono` or `packages/runtime`
+ *
+ * `packages/adapters/hono/vitest.config.ts` aliases `@objectstack/runtime` to a
+ * stub, and `packages/runtime` cannot depend on `@objectstack/hono` (that
+ * package depends on it). This package boots the two for real:
+ * `@objectstack/hono` is aliased to this checkout's adapter SOURCE (the
+ * subject), and `@objectstack/runtime` resolves through its `dist/` (a
+ * ledgered pair in `scripts/check-test-source-alias.mjs`), so a runtime change
+ * reaches these rows once that package is rebuilt, as CI builds it.
+ *
+ * ## The rig
+ *
+ * The read-side twin (`hono-meta-item-read-gate.conformance.test.ts`) answers
+ * reads from a stub protocol, which keeps no version and no draft, so a save
+ * there could not be refused or staged. Here the protocol is the real one:
+ * `ObjectQLPlugin`'s built-in assembly registers `ObjectStackProtocolImplementation`
+ * and the `sys_metadata*` objects, over an in-memory SQLite (pure-JS WASM)
+ * driver handed to it as a `driver.*` service. The one stubbed seam is the
+ * dispatcher's identity step, as in the read-side twin: every request is the
+ * same author holding `manage_metadata`, so no row depends on the request for
+ * who the caller is.
+ */
+
+import { describe, it, expect, vi, afterEach } from 'vitest';
+import { LiteKernel } from '@objectstack/core';
+import { ObjectQLPlugin } from '@objectstack/objectql';
+import type { ObjectQL } from '@objectstack/objectql';
+import { SqliteWasmDriver } from '@objectstack/driver-sqlite-wasm';
+import { HttpDispatcher } from '@objectstack/runtime';
+import { createHonoApp } from '@objectstack/hono';
+
+const PREFIX = '/api/v1';
+/** An author: `manage_metadata` saves, and reads drafts. */
+const AUTHOR = { userId: 'u_author', isSystem: false, systemPermissions: ['manage_metadata'] };
+
+const TASK = {
+    name: 'task',
+    label: 'Task',
+    fields: {
+        name: { name: 'name', type: 'text' as const, label: 'Name' },
+    },
+};
+
+const view = (name: string, label: string) => ({
+    name,
+    label,
+    object: 'task',
+    viewKind: 'list',
+    columns: [{ field: 'name', label: 'Name' }],
+});
+
+const clone = <T>(v: T): T => JSON.parse(JSON.stringify(v));
+
+const liveKernels: LiteKernel[] = [];
+afterEach(async () => {
+    vi.restoreAllMocks();
+    while (liveKernels.length) {
+        const kernel = liveKernels.pop();
+        await Promise.race([
+            kernel?.shutdown(),
+            new Promise<void>((resolve) => setTimeout(resolve, 10_000)),
+        ]);
+    }
+});
+
+interface Answer { status: number; body: any }
+interface SaveOptions { headers?: Record<string, string>; query?: Record<string, string> }
+
+/** The real store, the real protocol over it, and the REAL `createHonoApp` over both. */
+async function boot() {
+    const driver = new SqliteWasmDriver({ filename: ':memory:' });
+    await driver.connect();
+
+    const kernel = new LiteKernel();
+    liveKernels.push(kernel);
+    kernel.use({
+        name: 'test-meta-save-driver',
+        version: '1.0.0',
+        init: (c: any) => { c.registerService('driver.memory', driver); },
+    } as any);
+    kernel.use(new ObjectQLPlugin());
+    await kernel.bootstrap();
+
+    const ql = kernel.getService<ObjectQL>('objectql');
+    ql.registerObject(TASK as any);
+    await ql.syncObjectSchema('task');
+
+    vi.spyOn(HttpDispatcher.prototype as any, 'timedResolveExecutionContext')
+        .mockImplementation(async () => clone(AUTHOR));
+
+    const app = createHonoApp({ kernel: kernel as any, prefix: PREFIX, cors: false });
+
+    const send = async (method: 'PUT' | 'GET', name: string, { headers = {}, query = {} }: SaveOptions, body?: unknown): Promise<Answer> => {
+        const url = new URL(`http://localhost${PREFIX}/meta/view/${name}`);
+        for (const [k, v] of Object.entries(query)) url.searchParams.set(k, v);
+        const res = await app.request(url.toString(), {
+            method,
+            headers: body === undefined ? headers : { 'content-type': 'application/json', ...headers },
+            ...(body === undefined ? {} : { body: JSON.stringify(body) }),
+        });
+        return { status: res.status, body: JSON.parse(await res.text()) };
+    };
+
+    return {
+        save: (name: string, label: string, opts: SaveOptions = {}) => send('PUT', name, opts, view(name, label)),
+        read: (name: string, query: Record<string, string> = {}) => send('GET', name, { query }),
+        /** The stored labels of a view, by lifecycle — the store, not the door's word for it. */
+        stored: async (name: string, state: 'active' | 'draft'): Promise<string[]> => {
+            const rows = await ql.find('sys_metadata', { where: { type: 'view', name, state } });
+            return (rows ?? []).map((r: any) => JSON.parse(String(r.metadata)).label as string);
+        },
+    };
+}
+
+/** A save the host accepted: `200`, `success: true`, and the receipt. */
+const accepted = (a: Answer) => {
+    expect({ status: a.status, success: a.body?.success }, JSON.stringify(a.body)).toEqual({ status: 200, success: true });
+    return a.body.data;
+};
+
+/** A save the host refused: the ADR-0112 envelope, status and nested `code` both. */
+const refused = (a: Answer) => ({ status: a.status, success: a.body?.success, code: a.body?.error?.code });
+
+describe('[#22221] a real createHonoApp host: PUT /meta/:type/:name honours If-Match, If-None-Match and ?mode=draft', () => {
+    it('control: an unguarded save writes the active row, and the last writer wins', async () => {
+        const host = await boot();
+        expect(accepted(await host.save('case_grid', 'v1')).state).toBe('active');
+        expect(accepted(await host.save('case_grid', 'v2')).state).toBe('active');
+
+        expect(await host.stored('case_grid', 'active')).toEqual(['v2']);
+        expect(await host.stored('case_grid', 'draft')).toEqual([]);
+    }, 60_000);
+
+    it('a stale If-Match: 409 METADATA_CONFLICT, the stored row unchanged; the current token still saves', async () => {
+        const host = await boot();
+        const first = accepted(await host.save('case_grid', 'v1'));
+        const second = accepted(await host.save('case_grid', 'v2'));
+        expect(second.version).not.toBe(first.version);
+
+        const stale = await host.save('case_grid', 'v3 over a stale read', { headers: { 'If-Match': first.version } });
+        expect(refused(stale)).toEqual({ status: 409, success: false, code: 'METADATA_CONFLICT' });
+        expect(await host.stored('case_grid', 'active')).toEqual(['v2']);
+
+        // Preservation: the token the last receipt served still pins a save.
+        accepted(await host.save('case_grid', 'v3', { headers: { 'If-Match': second.version } }));
+        expect(await host.stored('case_grid', 'active')).toEqual(['v3']);
+    }, 60_000);
+
+    it('If-None-Match: * over an existing row: 409 METADATA_CONFLICT, the stored row unchanged', async () => {
+        const host = await boot();
+        accepted(await host.save('fresh_grid', 'first', { headers: { 'If-None-Match': '*' } }));
+        expect(await host.stored('fresh_grid', 'active')).toEqual(['first']);
+
+        const again = await host.save('fresh_grid', 'second', { headers: { 'If-None-Match': '*' } });
+        expect(refused(again)).toEqual({ status: 409, success: false, code: 'METADATA_CONFLICT' });
+        expect(await host.stored('fresh_grid', 'active')).toEqual(['first']);
+    }, 60_000);
+
+    it('?mode=draft stages a draft: the active row unchanged, the draft read back through ?state=draft', async () => {
+        const host = await boot();
+        accepted(await host.save('case_grid', 'live'));
+
+        expect(accepted(await host.save('case_grid', 'staged', { query: { mode: 'draft' } })).state).toBe('draft');
+        expect(await host.stored('case_grid', 'active')).toEqual(['live']);
+        expect(await host.stored('case_grid', 'draft')).toEqual(['staged']);
+
+        // The doors the platform reads it through, on the same host: the draft
+        // read answers the staged row, the plain read still the active one.
+        const draftRead = await host.read('case_grid', { state: 'draft' });
+        expect(draftRead.status, JSON.stringify(draftRead.body)).toBe(200);
+        expect(draftRead.body?.data?.item?.label).toBe('staged');
+        const plainRead = await host.read('case_grid');
+        expect(plainRead.status, JSON.stringify(plainRead.body)).toBe(200);
+        expect(plainRead.body?.data?.item?.label).toBe('live');
+    }, 60_000);
+});