wwjcloud-nest-v1/tools-v1/java-tools/MIGRATION-RULES.md

### WWJCloud Migration Tooling Rules

Purpose: Standardize Java→NestJS migration for AI-friendly, repeatable generation. Tools only; do not hand-edit generated outputs.

— Scope & Principles —
- **Java架构参考**: 主要架构参考是Java框架 (Spring Boot)，扫描Java项目的service/core, service/admin, service/api结构
- **三层架构**: 按照Java的三层结构生成NestJS服务：core(核心业务) + admin(管理服务) + api(接口服务)
- **Core依赖**: admin/api层服务可以依赖core层服务，类似Java的`@Resource ICoreSiteService`
- NestJS compliance: Follow official module/controller/service/entity/DTO patterns; DI-first; guards/pipes/interceptors.
- Core-only: Generators write strictly under `libs/wwjcloud-core/src/{module}/...`. Do NOT create/modify `src/common`, `src/vendor`, or `src/config`.

— Contracts & Compatibility —
- Database alignment: Table/column/index/types must match PHP 100%. No new/renamed/removed fields.
- Method alignment: Service method names map 1:1 with PHP. Do not invent names.
- Routing: Keep `/adminapi` and `/api` prefixes and controller segmentation consistent with PHP.
- Validation: Map PHP validators to DTO + class-validator/pipes. Behaviorally equivalent.

— Naming & Paths —
- Files: kebab-case filenames
  - Controllers: `*.controller.ts`
  - Services: `*.service.ts`
  - Entities: `*.entity.ts`
- Classes: PascalCase.
- Aliases (tsconfig): `@wwjCommon/*`, `@wwjCore/*`, `@wwjVendor/*`, `@/*`.

— Infrastructure Mapping (V1 Framework) —
- Use V1框架基础设施层:
  - Cache: `@wwjcloud-boot/infra/cache/cache.service` (CacheService)
  - Metrics: `@wwjcloud-boot/infra/metrics/metrics.service` (MetricsService)
  - Tenant: `@wwjcloud-boot/infra/tenant/tenant.service` (TenantService)
  - Auth: `@wwjcloud-boot/infra/auth/*` (AuthGuard, RbacGuard)
  - Vendor Services: `@wwjcloud-boot/vendor/*` (PayService, UploadService, SmsService, NoticeService)
  - 参考Java架构: @Service + 依赖注入，类似Spring Boot模式

— Module Generation —
- Generate `libs/wwjcloud-core/src/{module}/{module}.module.ts` registering discovered controllers/services.
- Entities: detect `*.entity.ts`; optionally include `TypeOrmModule.forFeature([...])` (feature flag). 
- Filter non-business directories by default (whitelist/blacklist). Avoid generating modules for technical directories like `job/`, `queue/`, `workerman/`, `lang/`, etc.

— Generation Stages (feature flags) —
- Commands: disabled by default (we do not use `nest-commander`).
- Jobs/Listeners: configurable; ensure no duplicate suffixes (avoid `JobJob`/`ListenerListener`).
- Routes: no separate route files (NestJS uses decorators).

— Idempotency & Safety —
- Re-runnable: Same inputs → same outputs. Overwrite files in place; create missing directories; never delete parent folders.
- Dry-run mode: Output plan without writing files; provide diff-like summary.
- Logging: Summarize counts for modules/controllers/services/entities/validators, skipped items, and errors.

— Security & Multitenancy —
- Guards: apply standard guards in controllers; enforce role checks and optional auth where applicable.
- Tenant isolation: preserve `site_id` semantics; avoid exposing sensitive fields in responses.

— Quality Gates —
- After generation (tool-side), optionally run TypeScript compile and ESLint checks. Fail fast and report.
- Remove duplicate imports; standardize import order; ensure resolved alias paths.

— Temporary Artifacts —
- All temporary scripts/docs/reports stay in `tools-v1/java-tools/`. Clean up when done. Never write temp files outside `tools-v1/java-tools/`.

— Enforcement —
- “Only fix tools, not generated files.” If outputs are wrong, update tools and re-run.

— Versioning & Extensibility —
- Keep infra replacement map versioned and extensible to support future modules and AI evolution.

— Quick Checklist —
- [ ] Files are kebab-case; classes are PascalCase
- [ ] Controllers only orchestrate/validate; services hold business logic
- [ ] Entities map DB 1:1 with PHP schema
- [ ] All infra imports use `@wwjCommon/*`
- [ ] `/adminapi` and `/api` controllers generated correctly
- [ ] Modules register found controllers/services; optional TypeORM feature import
- [ ] Commands disabled; jobs/listeners gated; no duplicate suffixes
- [ ] Safe write, idempotent, dry-run available; logs emitted