agentic-dev/packages/marketing-pages/AGENTS.md

# AGENTS.md — marketing-pages

Pages collection + SiteSettings global for site-wide metadata. Provides marketing/landing page content, SEO settings, and site configuration via Payload.

## Overview

`@repo/marketing-pages` owns: Page and SiteSettings domain models, marketing-pages-scoped errors, `IPagesRepository` + `ISiteSettingsRepository` interfaces, two use cases, two controllers, real Payload-backed repositories, and the tRPC `marketingPagesRouter`. Query builders live in `./ui`.

## Layer responsibilities

| Layer | Key files |
|---|---|
| **entities/models** | `page.ts` (`Page`, `PageStatus`, `Hero`), `site-settings.ts` (`SiteSettings`) — Zod schemas + types |
| **entities/errors** | `page.ts` (PageNotFoundError), `common.ts` (InputParseError) |
| **application/use-cases** | `get-page-by-slug.use-case.ts`, `get-site-settings.use-case.ts` — factory functions + exported schemas |
| **application/repositories** | `pages.repository.interface.ts`, `site-settings.repository.interface.ts` |
| **infrastructure/repositories** | `pages.repository.ts`, `site-settings.repository.ts` (real Payload-backed); `pages.repository.mock.ts`, `site-settings.repository.mock.ts` |
| **interface-adapters/controllers** | `get-page-by-slug.controller.ts`, `get-site-settings.controller.ts` — one file per use case |
| **di** | `symbols.ts` (MARKETING_PAGES_SYMBOLS), `module.ts`, `container.ts`, `bind-production.ts` |
| **integrations/api** | `procedures.ts` (marketingPagesProcedure), `router.ts` (marketingPagesRouter) |
| **integrations/cms** | `collections/pages.ts`, `globals/site-settings.ts` — Payload definitions |
| **ui** | `src/ui/index.ts` — re-exports `pageBySlugQuery` and `siteSettingsQuery` |

## Public exports

| Subpath | Contents |
|---|---|
| `.` | `Page`, `PageStatus`, `Hero`, `SiteSettings` types; `PageNotFoundError`, `InputParseError`; all use-case schemas + input/output types + `IXUseCase` aliases; `IXController` type aliases; `MarketingPagesRouter` type |
| `./ui` | `pageBySlugQuery`, `siteSettingsQuery` — React Query option builders |
| `./api` | `marketingPagesRouter` (tRPC router) |
| `./cms` | Payload Pages collection + SiteSettings global |
| `./di/bind-production` | `bindProductionMarketingPages(container, config)` |

## Use-case + controller patterns

See `CLAUDE.md` Key Conventions and `docs/architecture/overview.md` for the canonical factory templates.

### Use cases

| Use case | Input schema | Output schema | Notes |
|---|---|---|---|
| `getPageBySlugUseCase` | `getPageBySlugInputSchema` — `{ slug }` | `getPageBySlugOutputSchema` — `pageSchema \| undefined` | Returns `undefined` for missing pages (preserves existing semantics); `PageNotFoundError` mapping is forward-compatible for if/when the use case changes to throw |
| `getSiteSettingsUseCase` | `getSiteSettingsInputSchema` — `z.object({}).strict()` (void input) | `getSiteSettingsOutputSchema` — `siteSettingsSchema` | Takes `_input: GetSiteSettingsInput` parameter; always returns settings or throws |

### Controllers

Both controllers use identity presenters — `function presenter(value: XOutput) { return value; }`. `getPageBySlugController` return type is `ReturnType<typeof presenter> | undefined` (preserves the missing-page semantics). Both accept `unknown` input and `safeParse` with the use-case's `xInputSchema`, throwing `InputParseError` on failure.

## Errors → tRPC codes

| Error class | tRPC code | Thrown by |
|---|---|---|
| `InputParseError` | `BAD_REQUEST` | controllers (safeParse failure) |
| `PageNotFoundError` | `NOT_FOUND` | forward-compat; current `getPageBySlugUseCase` returns `undefined` instead of throwing |

Defined in `src/integrations/api/procedures.ts` via `marketingPagesProcedure = t.procedure.use(defineErrorMiddleware([...]))`.

## Tests

- **Factories:** `src/__factories__/page.factory.ts`, `src/__factories__/site-settings.factory.ts`
- **Contract suites:** `src/__contracts__/pages-repository.contract.ts`, `src/__contracts__/site-settings-repository.contract.ts`
- **Unit tests:** colocated `*.test.ts` next to each source file
- **Feature integration:** `tests/page-by-slug.feature.test.ts` — full slice: tRPC caller → controller → use case → mock repo
- **R25** (output validation): `get-page-by-slug.use-case.test.ts` has a test injecting a malformed page repository mock asserting `.rejects.toBeInstanceOf(ZodError)`. `get-site-settings.use-case.test.ts` uses an inline malformed repository mock (e.g., `{ siteName: "" }` failing `min(1)`) to assert ZodError.
- **R26** (router error mapping): `router.test.ts` asserts `BAD_REQUEST` on empty input for `pageBySlug`; confirms `undefined` return for missing slug (use case does not throw `PageNotFoundError` today).
- **R27/R28** (presenter shape): both controllers use identity presenters — no reshape test obligation.

```bash
pnpm test --filter @repo/marketing-pages
pnpm test --filter @repo/marketing-pages -- --watch
```

See `docs/guides/tdd-workflow.md` for the full cycle.

## Directory structure

```
src/
  entities/
    models/
      page.ts
      site-settings.ts
    errors/
      page.ts          # PageNotFoundError
      common.ts        # InputParseError
  application/
    repositories/
      pages.repository.interface.ts
      site-settings.repository.interface.ts
    use-cases/
      get-page-by-slug.use-case.ts
      get-site-settings.use-case.ts
  infrastructure/
    repositories/
      pages.repository.ts               # real Payload-backed
      pages.repository.mock.ts
      site-settings.repository.ts       # real Payload-backed
      site-settings.repository.mock.ts
  interface-adapters/
    controllers/
      get-page-by-slug.controller.ts
      get-site-settings.controller.ts
  integrations/
    api/
      procedures.ts    # marketingPagesProcedure
      router.ts        # marketingPagesRouter
    cms/
      collections/
        pages.ts
      globals/
        site-settings.ts
      index.ts
  di/
    symbols.ts
    module.ts
    container.ts
    bind-production.ts
  ui/
    index.ts           # pageBySlugQuery, siteSettingsQuery
    query.ts
  index.ts
  __factories__/
    page.factory.ts
    site-settings.factory.ts
  __contracts__/
    pages-repository.contract.ts
    site-settings-repository.contract.ts
tests/
  page-by-slug.feature.test.ts
```

## What it must NOT import

- Any other feature package (`@repo/auth`, `@repo/blog`, etc.)
- Any app package
- `@repo/core-api`, `@repo/core-cms`, `@repo/core-trpc`, `@repo/core-ui` directly; only `@repo/core-shared`

## Cross-links

- ADR-012 (`docs/decisions/adr-012-lazar-conformance.md`) — factory-style use cases, per-use-case controllers, file-naming conventions
- ADR-013 (`docs/decisions/adr-013-input-output-unification.md`) — schemas-in-use-case, presenter, `./ui` subpath, error middleware
- Refactor logs: `docs/superpowers/refactor-logs/2026-05-05-lazar-pattern-conformance.md` (Plan 8), `docs/superpowers/refactor-logs/2026-05-06-input-output-unification.md` (Plan 9)