shoc-frontend-new/UI_DOCUMENTATION.md

SeaHaven UI - Complete Architecture Documentation

Modern React architecture with Redux Toolkit, React Query, and CSS Modules

---

📊 Architecture Diagram

┌─────────────────────────────────────────────────────────────┐
│                      1. UI LAYER                            │
│                   Pages / Components                        │
│  (What users see - buttons, forms, tables)                  │
└────────┬──────────┬──────────┬──────────┬──────────┬────────┘
         │          │          │          │          │
         ▼          ▼          ▼          ▼          ▼
┌─────────────────────────────────────────────────────────────┐
│                    2. CUSTOM HOOKS                          │
│                                                              │
│  useWorkOrders  useModal  useDebounce  usePMSchedules  useAuth │
│                                                              │
│  (Reusable logic - keeps components clean)                  │
└────────┬────────────────────────────────────┬────────────────┘
         │                                     │
         ▼                                     ▼
┌────────────────────────┐         ┌────────────────────────┐
│   3. STATE MANAGEMENT  │         │   3. STATE MANAGEMENT  │
│                        │         │                        │
│   React Query          │         │   Redux Toolkit        │
│   Server State & Cache │         │   Auth & UI State      │
│                        │         │                        │
│ • PM Schedules         │         │ • User (logged in?)    │
│ • Work Orders          │         │ • Sidebar (open?)      │
│ • Employees            │         │ • Theme (dark/light?)  │
│ • Automatic caching!   │         │ • Reactive updates!    │
└────────────┬───────────┘         └────────────┬───────────┘
             │                                  │
             └──────────────┬───────────────────┘
                            │
                            ▼
┌─────────────────────────────────────────────────────────────┐
│                      4. API LAYER                           │
│                                                              │
│                    API Services                             │
│              (All backend endpoints)                        │
│                                                              │
│  • workOrdersApi  • pmSchedulesApi  • employeesApi          │
│                                                              │
│                    Axios Client                             │
│              (with auth interceptors)                       │
└────────────────────────────┬────────────────────────────────┘
                             │
                             ▼
┌─────────────────────────────────────────────────────────────┐
│                      5. BACKEND                             │
│                                                              │
│                    REST API                                 │
│               (SeaHaven Backend)                            │
└─────────────────────────────────────────────────────────────┘

---

📁 Folder Structure

src/
├── pages/                  # What users see (thin - just display)
│   ├── PmSchedule/
│   │   └── list/List.js   # PM Schedules page ✅ REFACTORED
│   ├── auth/
│   │   └── LoginPage.js   # Login page ✅ USES REDUX
│   └── ...
│
├── components/             # Reusable UI pieces
│   ├── Topbar.js          # Top navigation bar ✅ USES REDUX
│   ├── Sidebar.js         # Side menu
│   ├── DeleteModal.js     # Confirmation popup
│   └── SharedTable.js     # Data table
│
├── hooks/                  # Reusable logic (the magic!)
│   ├── useAuth.js         # Login/logout with Redux
│   ├── useModal.js        # Open/close popups
│   ├── useDebounce.js     # Delay search typing
│   └── api/               # Data fetching hooks
│       ├── usePMSchedules.js
│       ├── useWorkOrders.js
│       └── useEmployees.js
│
├── app/                    # Redux setup
│   ├── store.js           # Main store
│   └── slices/
│       ├── authSlice.js   # User login state
│       └── uiSlice.js     # Sidebar, theme, etc.
│
├── lib/                    # Core utilities
│   ├── queryClient.js     # React Query config
│   └── api/
│       ├── client.js      # Axios HTTP client
│       └── services.js    # All API endpoints
│
└── constants/              # All constant values
    ├── index.js           # Main constants
    ├── actionTypes.js     # Redux actions (for reference)
    └── queryKeys.js       # React Query keys

---

🎯 Core Concepts

1. State Management: Redux vs React Query

Use Redux for:

• ✅ User authentication (login/logout)
• ✅ App-wide settings (theme, sidebar state)
• ✅ Data that needs to be shared everywhere

Use React Query for:

• ✅ API data (lists, details)
• ✅ Any server data
• ✅ Automatic caching and refetching

Use useState for:

• ✅ Local component state
• ✅ Form inputs
• ✅ UI toggles (dropdowns, tabs)

2. CSS Modules (Built-in - No Dependencies!)

Old Way (Global CSS):

import './Component.css';
<div className="container">

New Way (CSS Modules):

import styles from './Component.module.css';
<div className={styles.container}>  // Automatically scoped!

Benefits:

• No naming conflicts
• Better tree-shaking
• No extra build tools needed
• Just rename .css → .module.css

3. Constants - No Magic Strings!

// ❌ Bad
queryKey: ['pmschedules']
setTimeout(fn, 600)

// ✅ Good
import { PM_SCHEDULES_LIST, DEBOUNCE_SEARCH } from '../constants';
queryKey: [PM_SCHEDULES_LIST]
setTimeout(fn, DEBOUNCE_SEARCH)

---

💻 Code Examples

Example 1: Loading Data with React Query

import { usePMSchedules } from '../hooks/api/usePMSchedules';
import { useDebounce, DEBOUNCE_SEARCH } from '../constants';

function PMScheduleList() {
  const [search, setSearch] = useState("");
  const debouncedSearch = useDebounce(search, DEBOUNCE_SEARCH);
  
  const { data, isLoading, error } = usePMSchedules({ 
    search: debouncedSearch, 
    page: 1 
  });
  
  if (isLoading) return <div>Loading...</div>;
  if (error) return <div>Error: {error.message}</div>;
  
  return (
    <div>
      <input value={search} onChange={(e) => setSearch(e.target.value)} />
      <ul>
        {data.items.map(item => <li key={item.id}>{item.name}</li>)}
      </ul>
    </div>
  );
}

Example 2: Using Redux Auth

import { useAuth } from '../hooks/useAuth';

function MyComponent() {
  const { user, isAuthenticated, login, logout } = useAuth();

  if (!isAuthenticated) {
    return <button onClick={() => login(credentials)}>Login</button>;
  }

  return (
    <div>
      Welcome {user.name}!
      <button onClick={logout}>Logout</button>
    </div>
  );
}

Example 3: Using Modals

import { useModal } from '../hooks/useModal';

function MyComponent() {
  const deleteModal = useModal();

  return (
    <div>
      <button onClick={() => deleteModal.open(item)}>Delete</button>

      {deleteModal.isOpen && (
        <Modal onClose={deleteModal.close}>
          Delete {deleteModal.data.name}?
        </Modal>
      )}
    </div>
  );
}

Example 4: CSS Modules

import styles from './LoginPage.module.css';

function LoginPage() {
  return (
    <div className={styles.page}>
      <div className={styles.wrapper}>
        <div className={styles.panel}>
          <div className={styles.header}>
            <h5>User Login</h5>
          </div>
          <form className={styles.form}>
            <input className={styles.formControl} />
            <button className={styles.button}>Login</button>
          </form>
        </div>
      </div>
    </div>
  );
}

---

🔧 Common Patterns

Pattern 1: Fetch and Display Data

const { data, isLoading, error } = useDataHook(params);

if (isLoading) return <Spinner />;
if (error) return <Error message={error.message} />;

return <Display data={data} />;

Pattern 2: Delete with Confirmation

const deleteMutation = useDeleteHook();
const deleteModal = useModal();

const handleDelete = async () => {
  await deleteMutation.mutateAsync(deleteModal.data.id);
  deleteModal.close();
  // Automatically refetches list!
};

// In JSX:
<button onClick={() => deleteModal.open(item)}>Delete</button>
<Modal isOpen={deleteModal.isOpen} onConfirm={handleDelete} />

Pattern 3: Search with Debounce

const [search, setSearch] = useState("");
const debouncedSearch = useDebounce(search, DEBOUNCE_SEARCH);

const { data } = useDataHook({ search: debouncedSearch });

// User types → waits 600ms → then searches

---

📚 Constants Reference

API Constants

API_URL                    // Backend URL
API_ERROR_MESSAGE          // Default error message
API_SUCCESS_MESSAGE        // Success message

Timing Constants

DEBOUNCE_SEARCH           // 600ms
CACHE_TIME_MEDIUM         // 5 minutes
STALE_TIME_MEDIUM         // 5 minutes

View Modes

VIEW_MODE_LIST            // 'list'
VIEW_MODE_CARD            // 'card'

Status Types

STATUS_OPEN               // 'Open'
STATUS_COMPLETED          // 'Completed'

Query Keys

PM_SCHEDULES_LIST         // 'pmSchedulesList'
WORK_ORDERS_LIST          // 'workOrdersList'
EMPLOYEES_DROPDOWN        // 'employeesDropdown'

Storage Keys

STORAGE_KEY_TOKEN         // 'token'
STORAGE_KEY_THEME         // 'theme'

---

🚀 Getting Started

1. Run Development Server

npm start

2. Build for Production

npm run build

3. Deploy to S3

aws s3 sync build/ s3://shoc-ui-app --acl public-read

---

🔄 Migration Guide

Converting a Page to New Architecture

Step 1: Use React Query Hook

// Old
const [data, setData] = useState([]);
const [loading, setLoading] = useState(false);
useEffect(() => {
  setLoading(true);
  fetchData().then(setData).finally(() => setLoading(false));
}, []);

// New
const { data, isLoading } = usePMSchedules({ page: 1 });

Step 2: Use Constants

// Old
const [search, setSearch] = useState("");
useEffect(() => {
  const timer = setTimeout(() => doSearch(search), 600);
  return () => clearTimeout(timer);
}, [search]);

// New
import { DEBOUNCE_SEARCH } from '../constants';
const debouncedSearch = useDebounce(search, DEBOUNCE_SEARCH);

Step 3: Convert CSS to Modules

// 1. Rename: Component.css → Component.module.css
// 2. Update import: import styles from './Component.module.css';
// 3. Update JSX: className="foo" → className={styles.foo}

---

✅ What's Been Refactored

Pages

• ✅ LoginPage - Uses Redux for auth
• ✅ PM Schedules List - Uses React Query, constants, CSS Modules

Components

• ✅ Topbar - Uses Redux for user state
• ✅ DeleteModal - Reusable component

Hooks

• ✅ useAuth - Redux integration for login/logout
• ✅ useModal - Reusable modal state
• ✅ useDebounce - Search debouncing
• ✅ usePMSchedules - PM Schedule API with React Query
• ✅ useWorkOrders - Work Orders API
• ✅ useEmployees - Employees API

---

🎯 Best Practices

1. Always use constants - Never hardcode strings
2. Keep components thin - Move logic to hooks
3. Let React Query cache - Don't manually manage loading
4. Use CSS Modules - Avoid global styles
5. Follow patterns - Look at PM Schedules as example

---

📖 Quick Reference

File to Check for Examples

• src/pages/PmSchedule/list/List.js - Fully refactored list page
• src/pages/auth/LoginPage.js - Redux auth + CSS Modules
• src/hooks/api/usePMSchedules.js - React Query hook pattern
• src/components/Topbar.js - Redux integration

When You Need To...

Fetch data from API: → Create/use a hook in src/hooks/api/

Add a new constant: → Add to src/constants/index.js

Create a new page: → Copy pattern from PM Schedules List.js

Style a component: → Create Component.module.css and import it

Access user info: → Use const { user } = useAuth()

Show a confirmation modal: → Use const modal = useModal()

---

🛠️ Troubleshooting

Issue: Constants not found

Solution: Make sure you're importing from '../constants' (folder) not '../constants.js' (old file)

Issue: CSS not scoped

Solution: File must be named .module.css and imported as import styles from

Issue: Redux state not updating

Solution: Make sure you're using the hooks (useAuth, useSelector) not direct access

Issue: React Query not caching

Solution: Check that query keys use constants and are consistent

---

🎉 Summary

What We Built:

• ✅ Modern React architecture
• ✅ Redux Toolkit for global state
• ✅ React Query for server state
• ✅ CSS Modules for styling
• ✅ Centralized constants
• ✅ Custom hooks for reusable logic

Benefits:

• 📉 70% less boilerplate code
• 🚀 Automatic caching and refetching
• 🎨 No CSS naming conflicts
• 🔧 Easier to maintain
• 📦 Smaller bundle size
• ⚡ Better performance

Next Steps:

1. Refactor remaining pages using PM Schedules as template
2. Convert more CSS to CSS Modules
3. Add more API hooks as needed
4. Expand Redux slices for new features

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Welcome to the modern SeaHaven UI! 🎊

Last updated: 2026