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+// Copyright (c) 2025 ObjectStack. Licensed under the Apache-2.0 license.
+
+/**
+ * #24882 — the format each specifier TYPE declares (ADR-0007: `email` / `url` /
+ * `phone` "format validation", `color` "hex string") is judged at both doors
+ * and, under the standing rule 「甲」, REPORTED rather than refused.
+ *
+ * Refusing these values narrows what the settings door has always accepted,
+ * and no ADR-0087 conversion can carry that: stored values are runtime state
+ * and an `OS_*` override is a deployment's environment. So this major version
+ * ships only the loud half, and these pins hold both of its halves:
+ *
+ *  - ACCEPTED, unchanged: a malformed save still answers `200` and the value is
+ *    stored and served as written; a malformed override is still in force,
+ *    still served with `source: 'env'` and still locks the key.
+ *  - REPORTED: exactly one `warn` line, naming namespace, key and type — and
+ *    never the value, for any key, so a secret-bearing key's value cannot reach
+ *    a log line through it.
+ *
+ * The save door is driven through the real route (`registerSettingsRoutes`
+ * over a real `SettingsService`, as `settings-routes.test.ts` does); the env
+ * door through the service's own read and write paths, which is where an
+ * override takes effect. Shipped manifests are used wherever a shipped key has
+ * the type; `phone` and a secret-bearing key are synthetic because no shipped
+ * manifest authors either, and both fixtures are parsed against
+ * `SettingsManifestSchema` below so they pin a shape an author can write.
+ */
+
+import { describe, expect, it, vi } from 'vitest';
+import type { IHttpServer, IHttpRequest, IHttpResponse, RouteHandler } from '@objectstack/spec/contracts';
+import { SettingsManifestSchema, type SettingsManifest } from '@objectstack/spec/system';
+import { SettingsService } from './settings-service.js';
+import { registerSettingsRoutes } from './settings-routes.js';
+import { brandingSettingsManifest } from './manifests/branding.manifest.js';
+import { companySettingsManifest } from './manifests/company.manifest.js';
+import { mailSettingsManifest } from './manifests/mail.manifest.js';
+import { LocalCryptoProvider } from './local-crypto-provider.js';
+
+class MockHttp implements IHttpServer {
+  routes = new Map<string, RouteHandler>();
+  private add(method: string, path: string, handler: RouteHandler) {
+    this.routes.set(`${method} ${path}`, handler);
+  }
+  get(path: string, h: RouteHandler) { this.add('GET', path, h); return this as any; }
+  post(path: string, h: RouteHandler) { this.add('POST', path, h); return this as any; }
+  put(path: string, h: RouteHandler) { this.add('PUT', path, h); return this as any; }
+  delete(path: string, h: RouteHandler) { this.add('DELETE', path, h); return this as any; }
+  patch(path: string, h: RouteHandler) { this.add('PATCH', path, h); return this as any; }
+  use() { return this as any; }
+  listen() { return Promise.resolve(); }
+  close() { return Promise.resolve(); }
+  getInstance() { return null; }
+}
+
+/** A diagnostics sink that records both levels, so an `error` line would be seen too. */
+function spyLogger() {
+  const warns: string[] = [];
+  const errors: string[] = [];
+  return {
+    warns,
+    errors,
+    logger: {
+      warn: (m: string) => void warns.push(m),
+      error: (m: string) => void errors.push(m),
+    },
+  };
+}
+
+/** Synthetic: a `phone` specifier (no shipped manifest authors one) and a secret-bearing `email`. */
+const formatLabManifest = {
+  namespace: 'format_lab',
+  version: 1,
+  label: 'Format Lab',
+  scope: 'global',
+  readPermission: 'setup.access',
+  writePermission: 'setup.write',
+  specifiers: [
+    { type: 'phone', key: 'support_phone', label: 'Support phone', required: false },
+    { type: 'email', key: 'billing_email', label: 'Billing email', required: false, encrypted: true },
+    { type: 'url', key: 'docs_url', label: 'Docs URL', required: false, maxLength: 12 },
+  ],
+} as unknown as SettingsManifest;
+
+/** The value a secret-bearing pin must never see in a log line. */
+const SECRET_MALFORMED = 'billing-desk-at-corp-internal';
+
+const ADMIN = () => ({
+  enforced: true,
+  permissions: ['setup.access', 'setup.write', 'manage_platform_settings'],
+  userId: 'usr_admin',
+  organizationId: 'org_a',
+});
+
+function makeStack(env: Record<string, string> = {}) {
+  const spy = spyLogger();
+  const secretRows = new Map<string, any>();
+  const svc = new SettingsService({
+    env,
+    logger: spy.logger,
+    // A confidentiality-providing crypto pair, so a write to the secret-bearing
+    // key is accepted by the fail-closed encryption gate and actually stored.
+    cryptoProvider: new LocalCryptoProvider(),
+    secretStore: {
+      async insert(row) { secretRows.set(row.id, row); return { id: row.id }; },
+      async get(id) { return secretRows.get(id) ?? null; },
+      async update(id, patch) { secretRows.set(id, { ...secretRows.get(id), ...patch }); },
+    },
+  });
+  svc.registerManifest(brandingSettingsManifest);
+  svc.registerManifest(companySettingsManifest);
+  svc.registerManifest(mailSettingsManifest);
+  svc.registerManifest(formatLabManifest);
+  const http = new MockHttp();
+  registerSettingsRoutes(http, svc, { contextFromRequest: ADMIN });
+  return { svc, http, ...spy };
+}
+
+/** `PUT /api/settings/:namespace` through the real route; status starts at 0 so `200` is asserted, not defaulted. */
+async function put(http: MockHttp, namespace: string, body: Record<string, unknown>) {
+  const req: IHttpRequest = { params: { namespace }, query: {}, body, headers: {}, method: 'PUT', path: '/' };
+  const state: { status: number; body?: any } = { status: 0 };
+  const res: IHttpResponse = {
+    json: vi.fn((data) => { state.body = data; }) as any,
+    send: vi.fn() as any,
+    status: vi.fn((code: number) => { state.status = code; return res; }) as any,
+    header: vi.fn(() => res) as any,
+  };
+  await http.routes.get('PUT /api/settings/:namespace')!(req, res);
+  return state;
+}
+
+/** One malformed and one well-formed value per type, each on a key whose type declares it. */
+const PER_TYPE = [
+  { type: 'url', ns: 'branding', key: 'logo_url', bad: 'not a url', good: 'https://cdn.example.com/logo.svg' },
+  { type: 'url', ns: 'company', key: 'website', bad: 'example dot com', good: 'https://example.com' },
+  { type: 'color', ns: 'branding', key: 'accent_color', bad: 'e11d48', good: '#e11d48' },
+  { type: 'email', ns: 'company', key: 'primary_contact_email', bad: 'ops at example.com', good: 'ops@example.com' },
+  { type: 'email', ns: 'mail', key: 'from_email', bad: 'no-reply@localhost', good: 'no-reply@example.com' },
+  { type: 'phone', ns: 'format_lab', key: 'support_phone', bad: 'call the desk', good: '+1 415 555 0100' },
+] as const;
+
+describe('synthetic fixture is a spec-valid authoring surface', () => {
+  it('format_lab parses under SettingsManifestSchema', () => {
+    // A fixture spelling a key the schema rejects would pin behaviour no author
+    // can reach.
+    expect(() => SettingsManifestSchema.parse(formatLabManifest)).not.toThrow();
+  });
+});
+
+describe('save door — a format miss is accepted and stored, and warned about once (#24882, 「甲」)', () => {
+  for (const c of PER_TYPE) {
+    it(`${c.ns}.${c.key} (${c.type}): a malformed value answers 200, is stored as written, and draws exactly one warning`, async () => {
+      const { svc, http, warns, errors } = makeStack();
+      const r = await put(http, c.ns, { [c.key]: c.bad });
+
+      // ACCEPTED: no refusal anywhere — the status, the envelope and the store.
+      expect(r.status).toBe(200);
+      expect(r.body.success).toBe(true);
+      expect(r.body.error).toBeUndefined();
+      expect(r.body.data.values[c.key].value).toBe(c.bad);
+      const stored = await svc.get(c.ns, c.key, ADMIN());
+      expect(stored.value).toBe(c.bad);
+      expect(stored.source).not.toBe('default');
+
+      // REPORTED: exactly one line, at warn, naming namespace, key and type.
+      expect(warns).toHaveLength(1);
+      expect(warns[0]).toContain(`'${c.ns}.${c.key}'`);
+      expect(warns[0]).toContain(`(type '${c.type}')`);
+      expect(warns[0]).toContain('The save is accepted');
+      // Never the value itself.
+      expect(warns[0]).not.toContain(c.bad);
+      expect(errors).toHaveLength(0);
+    });
+
+    it(`${c.ns}.${c.key} (${c.type}): a well-formed value draws no warning`, async () => {
+      const { svc, http, warns, errors } = makeStack();
+      const r = await put(http, c.ns, { [c.key]: c.good });
+      expect(r.status).toBe(200);
+      expect((await svc.get(c.ns, c.key, ADMIN())).value).toBe(c.good);
+      expect(warns).toHaveLength(0);
+      expect(errors).toHaveLength(0);
+    });
+  }
+
+  it('the other shapes each grammar admits draw no warning either', async () => {
+    // The readers' own contracts: `logoUrl` is "absolute or relative", storage
+    // hands back a root-relative path for an upload, and CSS hex colours come
+    // in four lengths.
+    const { http, warns } = makeStack();
+    for (const logo of ['/api/v1/storage/files/abc123', 'data:image/svg+xml;base64,PHN2Zy8+', 'http://intranet.local/logo.png']) {
+      expect((await put(http, 'branding', { logo_url: logo })).status).toBe(200);
+    }
+    for (const colour of ['#abc', '#abcd', '#AABBCC', '#aabbccdd']) {
+      expect((await put(http, 'branding', { accent_color: colour })).status).toBe(200);
+    }
+    expect(warns).toEqual([]);
+  });
+
+  it('a secret-bearing key: the malformed save is accepted, and its warning never carries the value', async () => {
+    const { svc, http, warns } = makeStack();
+    const r = await put(http, 'format_lab', { billing_email: SECRET_MALFORMED });
+    expect(r.status).toBe(200);
+    // Stored: the in-process read decrypts the real plaintext back.
+    expect((await svc.get('format_lab', 'billing_email', ADMIN())).value).toBe(SECRET_MALFORMED);
+
+    expect(warns).toHaveLength(1);
+    expect(warns[0]).toContain("'format_lab.billing_email'");
+    expect(warns[0]).toContain("(type 'email')");
+    expect(warns[0]).not.toContain(SECRET_MALFORMED);
+    // Not a fragment of it either.
+    expect(warns[0]).not.toContain('billing-desk');
+    expect(warns[0]).not.toContain('corp-internal');
+  });
+
+  it('a refused patch carries exactly the errors it carried before, and draws no format warning', async () => {
+    const { svc, http, warns } = makeStack();
+    // `docs_url` declares `maxLength: 12`: the length refusal keeps precedence
+    // over the format, and the one FieldError for the key is the length one.
+    const r = await put(http, 'format_lab', { docs_url: 'not a url at all' });
+    expect(r.status).toBe(400);
+    expect(r.body.error.code).toBe('SETTINGS_VALIDATION');
+    expect(r.body.error.details.fields).toHaveLength(1);
+    expect(r.body.error.details.fields[0].field).toBe('docs_url');
+    expect(r.body.error.details.fields[0].code).toBe('max_length');
+    // A batch refused for one key is refused whole: the malformed neighbour is
+    // not stored, so it is not reported either.
+    const r2 = await put(http, 'format_lab', { docs_url: 'not a url at all', support_phone: 'call the desk' });
+    expect(r2.status).toBe(400);
+    expect(r2.body.error.details.fields.map((f: { field: string }) => f.field)).toEqual(['docs_url']);
+    expect((await svc.get('format_lab', 'support_phone', ADMIN())).source).toBe('default');
+    expect(warns).toEqual([]);
+  });
+
+  it('an empty or blank value is not a format miss', async () => {
+    const { http, warns } = makeStack();
+    expect((await put(http, 'branding', { logo_url: '' })).status).toBe(200);
+    expect((await put(http, 'branding', { logo_url: '   ' })).status).toBe(200);
+    expect(warns).toEqual([]);
+  });
+});
+
+describe('env door — a format-missing override stays in force, and is warned about once (#24882, 「甲」)', () => {
+  for (const c of PER_TYPE) {
+    const envName = `OS_${c.ns}_${c.key}`.toUpperCase();
+
+    it(`${envName} (${c.type}): a malformed override is in force, served and locking, with exactly one warning`, async () => {
+      const { svc, http, warns, errors } = makeStack({ [envName]: c.bad });
+      // Reported at boot — `registerManifest` audits the overrides — not on a
+      // first read that may never come.
+      expect(warns).toHaveLength(1);
+
+      const r = await svc.get(c.ns, c.key, ADMIN());
+      expect(r.value).toBe(c.bad);
+      expect(r.source).toBe('env');
+      expect(r.locked).toBe(true);
+      // Still locking: a save of the key is refused 409 exactly as before.
+      const w = await put(http, c.ns, { [c.key]: c.good });
+      expect(w.status).toBe(409);
+      expect(w.body.error.code).toBe('SETTINGS_LOCKED');
+      // Re-reads and the namespace payload do not repeat the line.
+      await svc.get(c.ns, c.key, ADMIN());
+      await svc.getNamespace(c.ns, ADMIN());
+
+      expect(warns).toHaveLength(1);
+      expect(warns[0]).toContain(envName);
+      expect(warns[0]).toContain(`'${c.ns}.${c.key}'`);
+      expect(warns[0]).toContain(`(type '${c.type}')`);
+      expect(warns[0]).toContain('It IS in force');
+      // An environment variable's value never reaches the log line.
+      expect(warns[0]).not.toContain(c.bad);
+      expect(errors).toHaveLength(0);
+    });
+
+    it(`${envName} (${c.type}): a well-formed override draws no warning`, async () => {
+      const { svc, warns, errors } = makeStack({ [envName]: c.good });
+      const r = await svc.get(c.ns, c.key, ADMIN());
+      expect(r.value).toBe(c.good);
+      expect(r.source).toBe('env');
+      expect(warns).toHaveLength(0);
+      expect(errors).toHaveLength(0);
+    });
+  }
+
+  it('a secret-bearing key: the override is in force, and its warning never carries the value', async () => {
+    const { svc, warns } = makeStack({ OS_FORMAT_LAB_BILLING_EMAIL: SECRET_MALFORMED });
+    const r = await svc.get('format_lab', 'billing_email', ADMIN());
+    expect(r.value).toBe(SECRET_MALFORMED);
+    expect(r.source).toBe('env');
+    expect(warns).toHaveLength(1);
+    expect(warns[0]).toContain('OS_FORMAT_LAB_BILLING_EMAIL');
+    expect(warns[0]).toContain("'format_lab.billing_email'");
+    expect(warns[0]).toContain("(type 'email')");
+    expect(warns[0]).not.toContain(SECRET_MALFORMED);
+    expect(warns[0]).not.toContain('billing-desk');
+    expect(warns[0]).not.toContain('corp-internal');
+  });
+
+  it('an override REJECTED by a refusal family is reported as rejected, not as a format miss', async () => {
+    // `docs_url` declares `maxLength: 12`; a 16-character override is ignored
+    // with the existing `error` line, and the format judgment never runs on a
+    // value that is not in force.
+    const { svc, warns, errors } = makeStack({ OS_FORMAT_LAB_DOCS_URL: 'not a url at all' });
+    const r = await svc.get('format_lab', 'docs_url', ADMIN());
+    expect(r.source).not.toBe('env');
+    expect(errors).toHaveLength(1);
+    expect(errors[0]).toContain('IGNORED');
+    expect(warns).toEqual([]);
+  });
+});