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frontend/components/COMPONENTS.md
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2026-03-31 12:32:56 +00:00

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# Components Documentation
> Whenever you create a new component in the components/ directory,
> automatically append a new section following the template below.
---
## CartProduct
**File:** components/CartProduct.tsx **Description:** Product card component.
Displays product image, name, description, formatted price, and a Buy button.
Width is controlled by the parent grid (w-full), not the card itself.
### Props
| Prop | Type | Required | Default | Description |
| ----------- | ---------------- | -------- | ------------ | ----------------------------------------------------------- |
| image | string | yes | - | URL/path to product image (Next.js Image) |
| imageAlt | string | no | Anh san pham | Alt text for accessibility |
| productName | string | yes | - | Product display name |
| price | number or string | yes | - | If number: auto-formatted to VND. If string: rendered as-is |
| description | string | yes | - | Short description, clamped to 2 lines |
| onBuy | () => void | no | undefined | Callback when Buy button is clicked |
### Internal Logic
- formattedPrice: number -> toLocaleString(vi-VN, { style: currency, currency:
VND })
- Image fallback: fa-solid fa-mug-hot icon shown behind image; if image fails
onError hides the img element
### Styling (CSS variables)
| Element | Key classes |
| ------------ | ------------------------------------------------------------------ |
| Card wrapper | flex flex-col w-full rounded-2xl, shadow uses --color-shadow-sm/md |
| Image area | relative w-full h-36, bg --color-border-light |
| Product name | font-bold text-sm, color --color-text-primary, line-clamp-1 |
| Description | text-xs, color --color-text-muted, line-clamp-2 |
| Price | text-sm font-bold, color --color-primary |
| Buy button | bg --color-primary, hover --color-primary-dark, active:scale-95 |
### Dependencies
- next/image
- Tailwind CSS + CSS custom properties from globals.css
- FontAwesome (fa-solid fa-mug-hot fallback, fa-cart-plus button icon)
### Notes
- Card width is w-full - controlled by parent grid in page.tsx
- available field on Product is checked in page.tsx before rendering
- onBuy currently logs to console - TODO: implement cart logic
---
## Navbar
**File:** components/Navbar.tsx **Description:** Left sidebar with collapsible
category filter. Sticky below header, full viewport height minus header.
### Props
| Prop | Type | Required | Default | Description |
| ---------------- | -------------------- | -------- | --------- | ------------------------------------------------- |
| isOpen | boolean | yes | - | true = expanded (240px), false = collapsed (64px) |
| onToggle | () => void | yes | - | Toggle expand/collapse |
| activeCategory | string | no | all | Currently selected category id |
| onCategoryChange | (id: string) => void | no | undefined | Fired when user clicks a category |
### Behavior
- Collapsed: 64px wide, icon only (w-16)
- Expanded: 240px wide, icon + label (w-60)
- Width transition: transition-all duration-250ms
- Active category: highlighted with --color-primary background
- Footer shows SHOP_INFO.openHours (icon only when collapsed)
### Styling
| Element | Key classes |
| ------------- | ----------------------------------------------------------- |
| Aside | sticky, border-r --color-border, bg --color-bg-sidebar |
| Toggle button | w-8 h-8 rounded-lg, hover bg --color-border-light |
| Active item | bg --color-primary text-white shadow-sm |
| Inactive item | hover bg --color-border-light, color --color-text-secondary |
### Dependencies
- next/link
- lib/constants: MENU_CATEGORIES, SHOP_INFO
- lib/types: MenuCategory
- FontAwesome icons
---
## Header (layouts/header.tsx)
**File:** layouts/header.tsx **Description:** Sticky top bar. 2-column layout:
Brand (left) + Auth button (right). Auth cycles Guest -> Manager -> Staff ->
Guest for UI demo.
### Props
None - reads SHOP_INFO and MOCK_USERS from lib/constants directly.
### Internal State
| State | Type | Description |
| ----- | ------------ | ------------------------------- |
| user | User or null | Current demo user. null = guest |
### Auth States
| State | Appearance |
| ------------ | ------------------------------------- |
| Guest (null) | Brown primary button, Dang nhap label |
| Manager | Gold/caramel badge with user-tie icon |
| Staff | Avatar circle + name, bordered button |
### Responsive
- Logo + shop name: always visible
- Tagline: hidden < md, shown md+
- Button label: hidden < sm, shown sm+
### Dependencies
- next/image, next/link
- lib/constants: SHOP_INFO, MOCK_USERS
- lib/types: User
- FontAwesome icons
---
## Footer (layouts/footer.tsx)
**File:** layouts/footer.tsx **Description:** Site footer with 12-column grid. 3
sections: Brand info, Social links, WiFi card.
### Props
None - reads SHOP_INFO and SOCIAL_LINKS from lib/constants directly.
### Layout
| Section | Mobile | md | lg/xl |
| ------------- | ----------- | ---------- | ------------ |
| Brand info | col-span-12 | col-span-6 | col-span-8/6 |
| Social + WiFi | col-span-12 | col-span-6 | col-span-4/6 |
### Sections
1. Brand: logo, name, tagline, address, phone, email, open hours
2. Social: Facebook, TikTok, Website links
3. WiFi: network name + password in monospace styled box
4. Bottom bar: copyright + Made with heart in Vietnam
### Dependencies
- next/image, next/link
- lib/constants: SHOP_INFO, SOCIAL_LINKS
- FontAwesome icons
---
## CartFab
**File:** components/CartFab.tsx **Description:** Floating Action Button
displaying cart item count. Shows badge with number of items and total price on
hover.
### Props
| Prop | Type | Required | Default | Description |
| ------- | ---------- | -------- | --------- | ---------------------------- |
| onClick | () => void | no | undefined | Callback when FAB is clicked |
### Features
- Displays cart icon with item count badge
- Shows total price on hover in tooltip
- Sticky position (bottom-right)
- Uses cart context to get items and total
### Styling
| Element | Key classes |
| ---------- | ----------------------------------------------- |
| FAB button | fixed bottom-6 right-6, rounded-full, shadow-lg |
| Badge | absolute top-0 right-0, red bg, small font |
| Tooltip | appears on hover, shows total price |
### Dependencies
- lib/cart-context: useCart()
- FontAwesome icons
---
## ReviewModal
**File:** components/ReviewModal.tsx **Description:** Modal for customer
reviews. Shows a 5-star rating selector and a textarea for written feedback.
After submission, displays a thank-you message. Appears on the payment page for
customers (via a dedicated "Đánh giá" button) and also opens automatically after
a successful payment action.
### Props
| Prop | Type | Required | Default | Description |
| ------- | ---------- | -------- | ------- | ----------------------------------------- |
| isOpen | boolean | yes | - | Controls modal visibility |
| onClose | () => void | yes | - | Callback to close the modal & reset state |
### Behavior
- **Star rating:** 5 interactive stars; hover highlights up to hovered star,
click locks selection. Disabled submit button until at least 1 star selected.
- **Star labels:** 1 = Rất tệ, 2 = Tệ, 3 = Bình thường, 4 = Tốt, 5 = Xuất sắc
- **Textarea:** Optional free-text review (placeholder in Vietnamese).
- **Footer buttons:**
- "Quay lại" — closes modal without submitting; resets all state.
- "Xác nhận" — submits (UI-only); transitions to thank-you state.
- **Thank-you state:** Replaces form with "Cảm ơn quý khách" message + close
button.
- **Backdrop click:** Also closes the modal (same as "Quay lại").
- **State reset:** All state (rating, hover, review text, submitted) resets on
close.
### Styling
| Element | Key classes |
| --------------- | ----------------------------------------------------------------------- |
| Backdrop | fixed inset-0, bg-black/50 backdrop-blur-sm, z-50 |
| Modal panel | max-w-md, rounded-2xl, border --color-border-light, white bg, shadow-xl |
| Stars | text-3xl sm:text-4xl, hover:scale-110, active:scale-95 |
| Active star | fa-solid fa-star text-yellow-400 |
| Inactive star | fa-regular fa-star text-(--color-border) |
| Textarea | rounded-xl, focus:ring with --color-primary/20 |
| Quay lại button | border --color-border, hover --color-border-light |
| Xác nhận button | bg --color-primary, disabled:opacity-50 |
| Thank-you icon | fa-solid fa-heart text-(--color-accent), --color-accent-light bg |
### Responsive
- Padding: `p-6 sm:p-8` — larger on sm+ screens
- Stars: `text-3xl sm:text-4xl`
- Modal width: `w-full max-w-md` with `p-4` page padding — works on all screen
sizes
### Dependencies
- React useState
- FontAwesome icons (fa-star, fa-regular fa-star, fa-heart, fa-arrow-left,
fa-check)
- Tailwind CSS + CSS custom properties from globals.css
### Usage in Payment Page
```tsx
// Only shown for customers (user.role === "customer")
const [isReviewOpen, setIsReviewOpen] = useState(false);
// Button in payment aside (only visible to customers)
<button onClick={() => setIsReviewOpen(true)}>Đánh giá</button>;
// Payment buttons (Tiền mặt / QR Code) also open the modal for customers
const handlePayment = () => {
if (isCustomer) setIsReviewOpen(true);
};
<ReviewModal isOpen={isReviewOpen} onClose={() => setIsReviewOpen(false)} />;
```
---
# Contexts Documentation
## AuthContext (lib/auth-context.tsx)
**File:** lib/auth-context.tsx **Description:** Manages user authentication
state including login, logout, and registration. Uses localStorage for
persistence.
### Provider Props
| Prop | Type | Required | Description |
| -------- | --------------- | -------- | ---------------- |
| children | React.ReactNode | yes | Child components |
### Hook: useAuth()
Returns `AuthContextType` with:
| Property | Type | Description |
| -------------------- | ----------------------------------------------- | ------------------------------------------------- |
| user | User \| null | Current logged-in user or null |
| login | (username: string, password: string) => boolean | Login function; returns success status |
| logout | () => void | Logout function; clears user and localStorage |
| registerPhone | string \| null | Phone number during registration flow |
| setRegisterPhone | (phone: string \| null) => void | Update registerPhone state |
| completeRegistration | (phone: string) => void | Complete registration and create customer account |
### Mock Database
Pre-configured accounts:
- Manager: `admin / admin`
- Staff: `Nguyễn Văn An / Nguyễn Văn An`, `Trần Thị Bình / Trần Thị Bình`, etc.
- Customer: Phone number as username, `user1` as password
### Storage
- Key: `coffee-shop-user`
- Format: JSON serialized User object
---
## CartContext (lib/cart-context.tsx)
**File:** lib/cart-context.tsx **Description:** Manages shopping cart state with
localStorage persistence. Tracks items, quantities, and totals.
### Provider Props
| Prop | Type | Required | Description |
| -------- | --------------- | -------- | ---------------- |
| children | React.ReactNode | yes | Child components |
### Hook: useCart()
Returns `CartContextValue` with:
| Property | Type | Description |
| -------------- | -------------------------------------- | --------------------------------------------------------- |
| items | CartItem[] | Array of items in cart |
| totalItems | number | Total quantity of items |
| totalPrice | number | Total price in VND |
| addToCart | (product: Product) => void | Add or increase product quantity |
| increaseQty | (id: number) => void | Increase product quantity by 1 |
| decreaseQty | (id: number) => void | Decrease product quantity by 1 (removes if qty reaches 0) |
| removeFromCart | (id: number) => void | Remove product from cart |
| setQuantity | (id: number, quantity: number) => void | Set exact quantity (removes if 0) |
### CartItem Interface
```typescript
interface CartItem {
id: number;
name: string;
description: string;
price: number;
quantity: number;
}
```
### Storage
- Key: `coffee-shop-cart`
- Format: JSON serialized CartItem[]
- Auto-loads on mount and auto-saves on change
---
## MenuContext (lib/menu-context.tsx)
**File:** lib/menu-context.tsx **Description:** Provides shared category/menu
state across components. Synchronizes Header mobile menu and Navbar sidebar
selection.
### Provider Props
| Prop | Type | Required | Description |
| -------- | --------------- | -------- | ---------------- |
| children | React.ReactNode | yes | Child components |
### Hook: useMenu()
Returns `MenuContextType` with:
| Property | Type | Description |
| ----------------- | -------------------- | ----------------------------------------------- |
| activeCategory | string | Currently selected category id (default: "all") |
| setActiveCategory | (id: string) => void | Update active category |
### Use Cases
- Sync Navbar sidebar and Header mobile menu category selection
- Clear search query when category changes (implemented in main page)
- Pass selected category to product filter logic
### Default Value
- `activeCategory: "all"` - Show all products by default