# Phase 1: Core Infrastructure - COMPLETE ✓

## Summary

Phase 1 (Core Infrastructure) has been completed successfully! All reusable components, common API endpoints, and core infrastructure are now in place and ready to be used throughout the application.

---

## What Was Completed

### ✅ 1.1 Database API Layer (Completed in Phase 0)
- **Database connection**: `api/shared/db.php`
- **Authentication middleware**: `api/shared/auth-middleware.php`
- **Response helpers**: `api/shared/response.php`
- **CORS configuration**: `api/shared/cors.php`

### ✅ 1.2 Common API Endpoints

**Client Management:**
- `api/clients/list.php` - List all clients with:
  - Search functionality
  - Active/inactive filtering
  - Pagination support
  - Returns: client_id, name, phone, email, active status

**Contact Management:**
- `api/clients/contacts.php` - List contacts with:
  - Filter by client_id
  - Search by name, email, or phone
  - Active/inactive filtering
  - Pagination support
  - Returns: contact details with client info and full name

**Resource Management:**
- `api/resources/engineers.php` - List engineers/users with:
  - Filter by role
  - Search by name or email
  - Active/inactive filtering
  - Pagination support
  - Returns: user details with full name

All API endpoints include:
- Authentication requirement
- Error handling
- JSON responses
- Pagination metadata

### ✅ 1.3 React Core Components

**Layout Components:**
- `Header.jsx` - Top navigation bar with:
  - Branding (Red Desk v4)
  - User information display
  - Role badge
  - Login/logout links
  - Responsive design

- `Sidebar.jsx` - Side navigation with:
  - Main app navigation (Dashboard, Tickets, Clients, Contacts, Quotes, Calendar, Reports)
  - Active route highlighting
  - Bootstrap Icons integration
  - Links to old PHP pages for reference

- `Footer.jsx` - Bottom footer with:
  - Copyright information
  - Branding

- `Layout.jsx` - Main layout wrapper combining Header, Sidebar, Footer

**Common Components:**
- `Loading.jsx` - Loading spinner with customizable:
  - Size (small, medium, large)
  - Message
  - Bootstrap styling

- `ErrorMessage.jsx` - Error display component with:
  - Error message extraction from various formats
  - Optional retry button
  - Dismissible option
  - Bootstrap alert styling

- `EmptyState.jsx` - Empty state display with:
  - Customizable icon
  - Title and message
  - Optional action button
  - Clean, centered design

- `Modal.jsx` - Reusable modal component with:
  - Backdrop support
  - Sizes (small, medium, large, xlarge)
  - Optional footer
  - Close button
  - Prevents body scroll when open
  - Click outside to close

- `Toast.jsx` - Toast notification with:
  - Types: success, error, warning, info
  - Auto-dismiss with configurable duration
  - Manual close button
  - Appropriate icons and colors

- `ToastContext.jsx` - Context provider for managing toasts:
  - Stack multiple toasts
  - Easy-to-use methods: success(), error(), warning(), info()
  - Auto-removal on timeout

- `DataTable.jsx` - Feature-rich data table with:
  - Column configuration (label, key, sortable, render function)
  - Sorting functionality with visual indicators
  - Row click handling
  - Loading and error states
  - Empty state handling
  - Bootstrap table styling (striped, hover, bordered, small)
  - Responsive wrapper

**Form Components:**
- `Input.jsx` - Text input with:
  - Label and required indicator
  - Error display
  - Help text
  - Optional icon
  - Disabled state
  - Bootstrap styling

- `Select.jsx` - Dropdown select with:
  - Label and required indicator
  - Placeholder option
  - Options from array (objects or primitives)
  - Configurable value/label keys
  - Error display
  - Help text

- `Textarea.jsx` - Multi-line text input with:
  - Label and required indicator
  - Configurable rows
  - Error display
  - Help text

- `DatePicker.jsx` - Date input with:
  - Label and required indicator
  - Min/max date constraints
  - Error display
  - Help text
  - Native HTML5 date picker

- `Checkbox.jsx` - Checkbox input with:
  - Label
  - Error display
  - Help text
  - Bootstrap form-check styling

**Index Files:**
- `components/form/index.js` - Exports all form components
- `components/common/index.js` - Exports all common components

### ✅ 1.4 Routing Configuration

**React Router Setup:**
- App.jsx updated with React Router v6 configuration
- ToastProvider integrated at app level (wraps entire app)
- All main application routes defined

**Routes Configured:**
- `/` - Redirects to dashboard
- `/dashboard` - Dashboard page (placeholder for Phase 2)
- `/tickets` - Tickets page (placeholder for Phase 4)
- `/clients` - Clients page (placeholder for Phase 3)
- `/contacts` - Contacts page (placeholder for Phase 5)
- `/quotes` - Quotes page (placeholder for Phase 5)
- `/calendar` - Calendar page (placeholder for Phase 5)
- `/reports` - Reports page (placeholder for Phase 5)
- `/test` - Test/authentication demo page
- `*` - 404 handler (redirects to dashboard)

**Placeholder Pages Created:**
All pages include:
- Layout wrapper (Header, Sidebar, Footer)
- "Coming soon" message with phase information
- Consistent styling
- Ready to be replaced with actual implementations

---

## Component Usage Examples

### Layout

```jsx
import Layout from './components/layout/Layout'

function MyPage() {
  return (
    <Layout>
      <h1>Page Content</h1>
    </Layout>
  )
}
```

### DataTable

```jsx
import { DataTable } from './components/common'

const columns = [
  { key: 'id', label: 'ID', sortable: true },
  { key: 'name', label: 'Name', sortable: true },
  {
    key: 'status',
    label: 'Status',
    render: (value) => <span className="badge bg-success">{value}</span>
  }
]

<DataTable
  columns={columns}
  data={data}
  loading={loading}
  error={error}
  onRowClick={(row) => console.log(row)}
  onSort={(column, direction) => console.log(column, direction)}
/>
```

### Form Components

```jsx
import { Input, Select, DatePicker, Checkbox } from './components/form'

<Input
  label="Email"
  name="email"
  type="email"
  required
  icon="bi-envelope"
  error={errors.email}
/>

<Select
  label="Client"
  name="client_id"
  options={clients}
  valueKey="client_id"
  labelKey="client_name"
  placeholder="Select a client"
  required
/>

<DatePicker
  label="Due Date"
  name="due_date"
  min={new Date().toISOString().split('T')[0]}
/>

<Checkbox
  label="Active"
  name="active"
/>
```

### Toast Notifications

```jsx
import { useToast } from './contexts/ToastContext'

function MyComponent() {
  const toast = useToast()

  const handleSuccess = () => {
    toast.success('Operation completed successfully!')
  }

  const handleError = () => {
    toast.error('Something went wrong!')
  }

  return (
    <div>
      <button onClick={handleSuccess}>Success</button>
      <button onClick={handleError}>Error</button>
    </div>
  )
}
```

### Modal

```jsx
import { Modal } from './components/common'
import { useState } from 'react'

function MyComponent() {
  const [showModal, setShowModal] = useState(false)

  return (
    <>
      <button onClick={() => setShowModal(true)}>Open Modal</button>

      <Modal
        show={showModal}
        onHide={() => setShowModal(false)}
        title="Confirm Action"
        size="medium"
        footer={
          <>
            <button className="btn btn-secondary" onClick={() => setShowModal(false)}>
              Cancel
            </button>
            <button className="btn btn-primary">
              Confirm
            </button>
          </>
        }
      >
        <p>Are you sure you want to proceed?</p>
      </Modal>
    </>
  )
}
```

### Loading and Error States

```jsx
import { Loading, ErrorMessage, EmptyState } from './components/common'

function MyComponent() {
  if (loading) return <Loading message="Loading data..." />

  if (error) return <ErrorMessage error={error} onRetry={fetchData} />

  if (data.length === 0) {
    return (
      <EmptyState
        icon="bi-inbox"
        title="No items found"
        message="Try creating a new item"
        action="bi-plus-circle"
        actionLabel="Create Item"
        onAction={() => setShowCreateModal(true)}
      />
    )
  }

  return <div>{/* Render data */}</div>
}
```

---

## API Usage Examples

### Client List

```javascript
import api from './services/api'

// Get all active clients
const response = await api.get('/clients/list.php', {
  params: {
    active_only: true,
    limit: 50,
    offset: 0
  }
})

// Search clients
const response = await api.get('/clients/list.php', {
  params: {
    search: 'Acme',
    active_only: true
  }
})
```

### Contacts

```javascript
// Get contacts for a specific client
const response = await api.get('/clients/contacts.php', {
  params: {
    client_id: 123,
    active_only: true
  }
})

// Get all contacts
const response = await api.get('/clients/contacts.php')
```

### Engineers

```javascript
// Get all active engineers
const response = await api.get('/resources/engineers.php', {
  params: {
    active_only: true
  }
})

// Filter by role
const response = await api.get('/resources/engineers.php', {
  params: {
    role: 'engineer',
    active_only: true
  }
})
```

---

## File Structure

```
react-app/
├── src/
│   ├── components/
│   │   ├── common/
│   │   │   ├── DataTable.jsx
│   │   │   ├── EmptyState.jsx
│   │   │   ├── ErrorMessage.jsx
│   │   │   ├── Loading.jsx
│   │   │   ├── Modal.jsx
│   │   │   ├── Toast.jsx
│   │   │   └── index.js
│   │   ├── form/
│   │   │   ├── Checkbox.jsx
│   │   │   ├── DatePicker.jsx
│   │   │   ├── Input.jsx
│   │   │   ├── Select.jsx
│   │   │   ├── Textarea.jsx
│   │   │   └── index.js
│   │   └── layout/
│   │       ├── Footer.jsx
│   │       ├── Header.jsx
│   │       ├── Layout.jsx
│   │       └── Sidebar.jsx
│   ├── contexts/
│   │   ├── AuthContext.jsx
│   │   └── ToastContext.jsx
│   └── services/
│       └── api.js

api/
├── auth/
│   ├── check.php
│   └── user.php
├── clients/
│   ├── list.php
│   └── contacts.php
├── resources/
│   └── engineers.php
└── shared/
    ├── auth-middleware.php
    ├── cors.php
    ├── db.php
    └── response.php
```

---

## Next Steps

With Phase 1 complete, you're now ready to proceed to **Phase 2: First Migration - Dashboard**

This will involve:
1. Creating dashboard-specific API endpoints
2. Building dashboard React components using the core components
3. Implementing data visualization (charts)
4. Migrating the dashboard from PHP to React
5. Testing and deploying the first migrated page

Or you can proceed with any other page migration - all the infrastructure is in place!

---

## Notes

- All components follow Bootstrap 5 styling conventions
- Components are designed to be reusable across the entire application
- Form components work well with React Hook Form
- All API endpoints include authentication checks
- Error handling is consistent across all components
- Components include proper accessibility attributes

**Status: Phase 1 Complete - Ready for Page Migrations! 🚀**