# Sprint 9 - Product Engagement Report

## 1. Architecture Decisions
- Product engagement was implemented as a dedicated module under product feature: `src/app/features/website/product/engagement/components`.
- ProductFacade remained the single feature entry point for engagement flows:
  - `loadRating(productID)`
  - `loadReviews(productID, query)`
  - `loadQuestions(productID, query)`
  - `submitReview(productID, input)`
  - `submitQuestion(productID, input)`
- No feature component uses `HttpClient` directly.
- Data flow remains layered:
  - Feature Container/Components -> `ProductFacade` -> `ProductDataService` -> `ProductDataProvider` (`ApiProductDataProvider`) -> `ApiService`.
- Existing auth/payment/bootstrap initialization flows were not changed.
- Widget/section/bootstrap runtime architecture was preserved.

## 2. Reusable Components Added
### Product Engagement Atoms
- `StarsComponent`
- `StarSelectorComponent`
- `ProductTabsComponent`
- `RatingSummaryComponent`

### Reviews
- `ReviewFormComponent`
- `ReviewCardComponent`
- `ReviewListComponent` (includes pagination support)

### Questions
- `QuestionFormComponent`
- `QuestionCardComponent`
- `QuestionListComponent` (includes pagination + Ask Question toggle)

### Product Page Sections
- Existing reusable sections kept:
  - Gallery, Product Info, Variant Selector, Delivery, Description, Related Products
- New/updated reusable sections:
  - `ProductSpecificationsComponent`
  - `ProductWarrantyComponent`
  - Reviews section via `ReviewListComponent`
  - Questions section via `QuestionListComponent`

## 3. Domain Models Added
File: `src/app/core/products/models/product-engagement.model.ts`
- `RatingSummary`
- `Review`
- `Question`
- `Answer`
- Supporting contracts:
  - `RatingDistributionEntry`
  - `EngagementListQuery`
  - `EngagementListResult<T>`
  - `SubmitReviewInput`
  - `SubmitQuestionInput`

## 4. Bootstrap Additions (Feature Config Only)
Added new optional config model:
- `src/app/shared/models/config/product-page-config.model.ts`

Added to bootstrap contract:
- `BootstrapConfig.productPage?: ProductPageConfig`

Added to mock bootstrap example:
- `src/assets/mock/bootstrap/bootstrap.json` now contains `productPage` with:
  - `rating.enabled`
  - `reviews.enabled/pageSize/showSummary`
  - `questions.enabled/pageSize`
  - `tabs.enabled/items`
  - `relatedProducts.enabled`

No review/question domain data was placed in bootstrap.

## 5. Backend Endpoints Expected
Prepared in docs/contracts as target backend API:
- `GET /products/{id}/rating`
- `GET /products/{id}/reviews`
- `GET /products/{id}/questions`
- `POST /products/{id}/reviews`
- `POST /products/{id}/questions`

Current runtime uses existing available mock/API item data mapping where applicable, while facade methods and contracts are already prepared for dedicated engagement endpoints.

## 6. Validation Results
### Build
- `npm run build` -> PASS

### Architecture Rules
- No `HttpClient` usage found in feature layer (`src/app/features/**`).
- No `environment.*` usage found in feature layer (`src/app/features/**`).
- No DTO imports found in feature layer (`src/app/features/**`, checked for `\bdto\b|\.dto`).

### Architecture Governance Scripts
- `npm run arch:check:boundaries` -> PASS
- `npm run arch:check:cycles` -> PASS (`No circular dependency found`)

## 7. Documentation Updated
Platform docs:
- `docs/platform/00-bootstrap-example.md`
- `docs/platform/02-bootstrap-json-spec.md`
- `docs/platform/06-api-contracts.md`
- `docs/platform/10-product-domain.md`
- `docs/platform/13-backend-requirements.md`

Backend docs:
- `docs/backend-platform/business-apis.md`

## 8. Future Extension Points
- Photo upload support in review form (placeholder is already present in UI).
- Backend-side moderation and verification flags for reviews/questions.
- Dedicated seller identity and accepted-answer workflow integration.
- Server-driven sorting/filtering for reviews and questions.
- Optional widgetized engagement blocks for dynamic page composition.