# Architecture — SOLUTION_ERP

> Kiến trúc tổng thể + trách nhiệm từng layer + diagram luồng dữ liệu.

## 1. Layered overview

```
┌──────────────────────────────────────────────────────────────┐
│                       CLIENT TIER                             │
│  ┌──────────────────┐       ┌──────────────────┐             │
│  │  fe-admin :8082  │       │  fe-user :8080   │             │
│  │  React 19 + Vite │       │  React 19 + Vite │             │
│  │  Tailwind 4      │       │  Tailwind 4      │             │
│  │  TanStack Query  │       │  TanStack Query  │             │
│  └────────┬─────────┘       └────────┬─────────┘             │
└───────────┼──────────────────────────┼───────────────────────┘
            │  Vite dev proxy /api     │
            │  IIS URL Rewrite prod    │
            ▼                          ▼
┌──────────────────────────────────────────────────────────────┐
│                     API LAYER (:5443)                         │
│  SolutionErp.Api — ASP.NET Core 10 Web API                   │
│  ┌────────────────────────────────────────────────────────┐  │
│  │ Controllers: Auth, Menus, Roles, Permissions,          │  │
│  │              Suppliers, Projects, Departments,         │  │
│  │              Forms, Contracts, Reports                 │  │
│  │ Middleware: GlobalException, Serilog, CORS, JWT        │  │
│  │ Authorization: MenuPermissionHandler (policy-based)    │  │
│  │ Services: CurrentUserService, WebHostEnvLocator        │  │
│  │ wwwroot/templates/ (5 .docx/.xlsx)                     │  │
│  └────────────────────┬───────────────────────────────────┘  │
└───────────────────────┼──────────────────────────────────────┘
                        │ MediatR ISender.Send(cmd)
                        ▼
┌──────────────────────────────────────────────────────────────┐
│                    APPLICATION LAYER                          │
│  SolutionErp.Application                                     │
│                                                               │
│  ┌──────────────┐  ┌──────────────┐  ┌──────────────────┐    │
│  │ Auth         │  │ Master       │  │ Permissions      │    │
│  │ (Login/Me)   │  │ (CRUD 3      │  │ (Menu tree +     │    │
│  │              │  │  entity)     │  │  matrix)         │    │
│  └──────────────┘  └──────────────┘  └──────────────────┘    │
│  ┌──────────────┐  ┌──────────────────┐                      │
│  │ Forms        │  │ Contracts        │  ┌──────────────┐    │
│  │ (Render      │  │ (Workflow 9      │  │ Reports      │    │
│  │  engine)     │  │  phase, Inbox)   │  │ (Dashboard + │    │
│  └──────────────┘  └──────────────────┘  │  Excel exp)  │    │
│                                           └──────────────┘    │
│  ┌──────────────────────────────────────────────────────┐    │
│  │ Common: Exceptions, Behaviors (ValidationPipeline),  │    │
│  │         Interfaces (IDbContext, ICurrentUser, ...),  │    │
│  │         Models (PagedResult)                         │    │
│  └──────────────────────────────────────────────────────┘    │
└───────┬──────────────────────────────────────────┬───────────┘
        │ depends on interface                     │ runs on
        ▼                                          ▼
┌──────────────────────┐           ┌───────────────────────────┐
│    DOMAIN LAYER      │           │   INFRASTRUCTURE LAYER    │
│  SolutionErp.Domain  │           │  SolutionErp.Infrastructure│
│                      │           │                           │
│  Common/BaseEntity   │           │  Persistence/ApplicationD │
│  Contracts/          │           │    bContext + Migrations  │
│  Forms/              │           │  Identity/JwtTokenService │
│  Identity/           │           │  Forms/Docx+XlsxRenderer  │
│  Master/             │           │  Services/ContractWorkflow│
│                      │           │    + ContractCodeGenerator│
│  Enum + value object │           │  Reports/ExcelExporter    │
└──────────────────────┘           │  Services/DateTimeService │
        ↑                          └────────────┬──────────────┘
        │ references                            │
        └───────────────────────────────────────┘
                                                │
                                                ▼
                                    ┌───────────────────────┐
                                    │  DATA TIER            │
                                    │  SQL Server 2022      │
                                    │  (dbo schema, 19 bảng)│
                                    └───────────────────────┘
```

## 2. Request lifecycle (1 POST/api/contracts)

```
1. Browser  →  POST /api/contracts    { type, supplierId, ... }
2. Vite     →  proxy tới :5443
3. JwtBearerMiddleware  →  validate token, set ClaimsPrincipal
4. Routing  →  ContractsController.Create(cmd)
5. MediatR.Send(CreateContractCommand)
6. ValidationBehavior (pipeline)  →  FluentValidation run
7. CreateContractCommandHandler
   ├─ check Supplier/Project exists (IApplicationDbContext)
   ├─ new Contract entity + set DrafterUserId (ICurrentUser)
   ├─ set SlaDeadline (IDateTime + IContractWorkflowService.GetPhaseSla)
   ├─ db.Contracts.Add(...)
   └─ SaveChangesAsync
      ├─ AuditingInterceptor sets CreatedAt/CreatedBy
      └─ EF Core INSERT → SQL Server
8. Return Guid id
9. Controller  →  201 Created + Location header
10. Axios interceptor (FE)  →  TanStack Query invalidate + UI update
```

## 3. Workflow state machine (Phase 3)

Xem full ở [`workflow-contract.md`](workflow-contract.md).

```
DangChon → DangSoanThao → DangGopY → DangDamPhan → DangInKy →
  → DangKiemTraCCM → DangTrinhKy → DangDongDau → DaPhatHanh

Alternates: → TuChoi (từ DangSoanThao)
            → DangSoanThao (revise từ bất kỳ phase duyệt)

Bypass CĐT (BypassProcurementAndCCM=true):
  DangInKy → DangTrinhKy (skip CCM)
```

**Code generator trigger:** khi `targetPhase = DangDongDau` + `MaHopDong IS NULL` → gen format RG-001 với transaction SERIALIZABLE.

## 4. Permission model

```
User ──(AspNetUserRoles)── Role ──(Permissions)── MenuItem
                                      │
                                      ├── CanRead
                                      ├── CanCreate
                                      ├── CanUpdate
                                      └── CanDelete
```

**Resolution:**
- Login → JWT chứa claims (sub, email, roles)
- `/api/menus/me` → query Permissions theo roleIds, **union OR** CRUD flags, filter tree theo CanRead
- FE cache menu trong `AuthContext` + localStorage
- Mỗi API action: `[Authorize(Policy = "{MenuKey}.{Action}")]` → `MenuPermissionHandler` check

**Admin bypass:** role `Admin` luôn pass mọi policy (seed default full CRUD).

## 5. Data flow — "tạo HĐ và chạy hết workflow"

```mermaid
sequenceDiagram
    actor D as Drafter
    actor M as Manager (PD/PM)
    actor C as CCM
    actor B as BOD
    actor H as HRA

    participant FE as fe-user
    participant API
    participant WF as WorkflowService
    participant CG as CodeGenerator
    participant DB

    D->>FE: POST /contracts/new
    FE->>API: POST /api/contracts
    API->>DB: INSERT Contracts (Phase=DangSoanThao, SLA=+7d)
    API-->>FE: 201 {id}

    D->>FE: Click "Submit → góp ý"
    FE->>API: POST /contracts/{id}/transitions {target:3}
    API->>WF: Transition(contract, 3, roles=[Drafter])
    WF->>WF: Check adjacency + role
    WF->>DB: INSERT ContractApproval + UPDATE Contract Phase=3
    API-->>FE: 204

    M->>FE: Inbox → click HĐ → góp ý + "Chuyển tiếp"
    FE->>API: POST /transitions {target:4}
    API->>WF: Transition → Phase 4
    Note over WF: Chạy tương tự qua 5,6,7

    B->>FE: Duyệt → target:8 DangDongDau
    FE->>API: POST /transitions {target:8}
    API->>WF: Transition
    WF->>CG: GenerateAsync(contract, project, supplier)
    CG->>DB: BEGIN TRAN SERIALIZABLE
    CG->>DB: SELECT/UPDATE ContractCodeSequences
    CG->>DB: COMMIT
    CG-->>WF: "FLOCK 01/HĐGK/SOL&PVL/03"
    WF->>DB: UPDATE Contract SET MaHopDong, Phase=8
    API-->>FE: 204

    H->>FE: Click đóng dấu → target:9
    FE->>API: POST /transitions {target:9}
    API->>WF: Transition (role HrAdmin)
    WF->>DB: UPDATE Phase=9 (DaPhatHanh)
    API-->>FE: 204
```

## 6. Deployment architecture (Phase 5 — planned)

```
                ┌─────────────────────────────┐
                │   Internet / Corp LAN       │
                └──────────────┬──────────────┘
                               │
                    ┌──────────▼──────────┐
                    │  IIS (Win Server)   │
                    │  URL Rewrite / ARR  │
                    └──────────┬──────────┘
                 ┌─────────────┼─────────────┐
                 │             │             │
          ┌──────▼──────┐ ┌───▼────┐ ┌──────▼──────┐
          │ fe-admin    │ │ Api    │ │ fe-user     │
          │ static files│ │ Kestrel│ │ static files│
          │ (dist/)     │ │ :5443  │ │ (dist/)     │
          └─────────────┘ └───┬────┘ └─────────────┘
                              │
                     ┌────────▼────────┐
                     │  SQL Server     │
                     │  (same host OR  │
                     │   separate VM)  │
                     └─────────────────┘
```

- IIS app pool riêng cho Api, Integrated Managed Pipeline, .NET CLR disabled (hosting .NET 10 OOP)
- Static files 2 FE deploy vào `C:\inetpub\wwwroot\solution-erp-admin\` + `...user\`
- HTTPS: Let's Encrypt qua win-acme (hoặc cert mua)
- Backup SQL: daily full + 15min log → D:\Backups

## 7. Skill library (AI agent support)

`.claude/skills/` có 3 skill chuyên biệt:

| Skill | Dùng khi |
|---|---|
| [`contract-workflow`](../.claude/skills/contract-workflow/SKILL.md) | Debug chuyển phase, 403, mã HĐ, bypass CĐT |
| [`form-engine`](../.claude/skills/form-engine/SKILL.md) | Render template, upload, placeholder không replace |
| [`permission-matrix`](../.claude/skills/permission-matrix/SKILL.md) | Access denied, menu không hiện, gán role |

Claude auto-invoke theo description matching.

## 8. Non-functional

| Aspect | Current | Phase 5 target |
|---|---|---|
| Availability | dev-only | 99.5% (IIS restart, SQL HA optional) |
| Latency | <200ms P95 local | <500ms P95 prod |
| Concurrency | unrestricted | rate limit 100 req/min/IP |
| Observability | Serilog console | + file rolling daily + Seq/ELK |
| Security | JWT + HTTPS dev | + rate limit + audit log + CSP |

## 9. Liên quan

- [`rules.md`](rules.md) — coding conventions
- [`database/database-guide.md`](database/database-guide.md) — DB schema chi tiết
- [`flows/`](flows/) — per-feature sequence diagrams
- [`workflow-contract.md`](workflow-contract.md) — state machine spec
- [`forms-spec.md`](forms-spec.md) — 8 form catalog