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pedwfrontend/AI_CONTEXT.md
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Robert Bond 0de9268255 Merged PR 2242: Refactor: New Appeal flow structural cleanup (Slices 1–8, no behaviour change)
## Summary

This PR merges the completed new-appeal refactor stream (Slices 1–8) into SIPS-Development.

This refactor was executed in controlled slices with regression validation at each step.

## Scope

Structural and readability improvements only:
- XML/form derivation extraction
- payload and file helper extraction
- side-effect facade introduction
- BuildSection and BuildCheckSection decomposition
- BuildCheckRow formatter map refactor
- nested prop boundary cleanup
- start-flow cleanup (CreateCase / AboutYou)

## Behaviour

No intended behavioural changes.

The following were explicitly preserved:
- S78 journey behaviour
- payload shapes and field names/ids
- HASCAS mapping logic
- appellant/agent branching
- validation rules and messages
- redirect/query parameters (`lpa`, `apt`, `id`)
- navigation and side-effect sequencing
- EN/CY output parity

## Validation

Full regression has been performed on:
- start flow (CreateCase / AboutYou)
- save and resume flows
- file upload handling
- check answers rendering
- submit/finalisation sequence
- confirmation flow
- CRM insertion path
- EN/CY parity

Additional checks:
- docsOffline branch behaviour
- completion and partial-save email paths
- negative-path validation scenarios
- lint (warnings baseline unchanged)

## Risk

Low:
- changes are structural only
- no business logic changes
- no contract changes

## Rollback

Safe rollback via reverting this merge commit.

## Notes

This refactor reduces coupling and prepares the new-appeal flow for future appeal-type expansion.

Related work items: #22570, #22576, #22577, #22583, #22586, #22587, #22588, #22590
2026-04-13 13:09:12 +00:00

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# AI Context — PEDW FrontEnd
## Overview
PEDW FrontEnd is a Next.js 14 (Pages Router) bilingual (EN/CY) public-service portal for planning case search, case detail/document viewing, and authenticated portal workflows (appeals, representations, watchlists, dashboard views).
## Architecture
- Monorepo-style Next.js app with UI routes in `pages/` and API handlers in `pages/api/**`.
- Redux (`next-redux-wrapper` + `redux-persist`) for shared client/server state.
- `next-auth` for auth/session with Prisma adapter.
- Integration-heavy BFF pattern: API routes proxy to relay/CRM and storage/notify services.
## Key components
- `components/breadcrumbs.js`: central breadcrumb/back-link behavior.
- `components/case/summary.js`: case-detail tabs, representation eligibility logic, watch/email actions.
- `actions/index.js`: shared API utilities, token/header/hash helpers, many side-effect wrappers.
- `pages/api/endpoint/**`: relay-backed business-data APIs.
- `pages/api/file/**`: blob/document/PDF/upload endpoints.
## Data model boundaries
- Prisma (`prisma/schema.prisma`) stores auth/session entities only (`User`, `Account`, `Session`, `VerificationToken`) on SQL Server.
- Business/case data is external (Dynamics/relay path), not persisted as Prisma domain models here.
## API/integration patterns
- Many endpoint handlers compute HMAC hash query params (`hash`) for relay-bound requests.
- Token acquisition + OData headers are reused across proxy handlers.
- File endpoints often validate request hash for sensitive blob actions.
- GOV.UK Notify used for email, including language-specific template selection in some flows.
## Infrastructure/tooling
- Scripts: `npm run dev`, `npm run build`, `npm start`, `npm run lint`.
- CI/CD artifacts present: `azure-pipelines.yml`, `Jenkinsfile`, `Dockerfile` (active production source-of-truth not explicit in repo).
- Security controls: `middleware.js` CSP/runtime headers + `next.config.js` security headers.
## Development constraints
- Preserve auth/session behavior in `pages/api/auth/[...nextauth].js`.
- Do not weaken CSP/security headers in `middleware.js` or `next.config.js`.
- Keep EN/CY parity across routes and locale resources (`i18n.js`, `locales/**`, rewrites).
- Treat relay hash behavior as security-sensitive; keep path/hash compatibility stable.
- Avoid logging secrets/personal data in auth/email/file/account flows.