# Section Engine Report

## Scope

Sprint 7 introduced the generic section engine used by the homepage runtime path. The implementation stays within the frozen frontend architecture and does not change backend APIs, auth, payment, or bootstrap contracts.

The section engine now treats the homepage as a section collection rendered through the existing dynamic page layout pipeline:

- page config -> section engine -> section renderer -> widget host -> registered widget components

## Implemented Changes

### Section Metadata

- `src/app/shared/models/config/section.model.ts`

Added explicit section metadata for:

- layout strategy
- layout columns/gap/alignment
- desktop/tablet/mobile visibility flags

### Render Nodes

- `src/app/dynamic-renderer/section-renderer/section-renderer.model.ts`
- `src/app/dynamic-renderer/section-renderer/section-renderer.service.ts`

Section render nodes now carry layout and visibility metadata forward from the shared section config.

### Section Engine

- `src/app/dynamic-renderer/section-engine/section-engine.service.ts`

Added the section engine orchestration service to build ordered page render models from section definitions.

### Page Renderer

- `src/app/dynamic-renderer/page-renderer/page-renderer.service.ts`

Delegates page model assembly to the section engine.

### Dynamic Layout

- `src/app/layouts/containers/dynamic-page-layout.component.ts`

The layout container now reads section layout strategy and visibility metadata when rendering sections.

### Homepage Migration

- `src/app/pages/home/home.component.ts`
- `src/app/pages/home/home.component.html`
- `src/assets/mock/bootstrap/homepage.json`

The homepage now loads the runtime page model and renders its section collection instead of hardcoding the hero and product carousel blocks directly in the template.

The existing category area remains on the homepage and still uses the category domain/facade path.

## Validation

Completed checks:

- Section layout and visibility metadata compile cleanly.
- Page renderer delegates through the new section engine service.
- Homepage composes the runtime page model through `DynamicPageLayoutComponent`.
- The workspace build passes.

Build validation:

```bash
npm run build
```

## Stop Point

Sprint 7 section-engine groundwork is complete for the current homepage flow. Stop here and wait for approval before extending the section system to additional website pages or adding new widget/data resolvers.