# Frontend Component Standards

**Version:** 1.0
**Last Updated:** December 2025
**Audience:** Frontend Developers

---

## Overview

This document defines mandatory standards for all frontend components across Admin, Vendor, and Shop frontends. Following these standards ensures consistency, maintainability, and a unified user experience.

---

## Golden Rules

1. **Use Jinja Macros** - Never copy-paste HTML patterns; use shared macros
2. **Alpine.js for Interactivity** - All client-side logic uses Alpine.js
3. **Dark Mode Required** - Every component must support dark mode
4. **Accessibility First** - ARIA labels, keyboard navigation, focus states
5. **Mobile Responsive** - Mobile-first design with Tailwind breakpoints

---

## Jinja Macro System

### Available Macro Files

All macros are located in `app/templates/shared/macros/`:

| File | Purpose | Key Macros |
|------|---------|------------|
| `pagination.html` | Table pagination | `pagination()`, `pagination_simple()` |
| `alerts.html` | Alerts and toasts | `loading_state()`, `error_state()`, `alert_dynamic()` |
| `badges.html` | Status indicators | `badge()`, `status_badge()`, `role_badge()` |
| `buttons.html` | Button variants | `btn_primary()`, `btn_secondary()`, `action_button()` |
| `forms.html` | Form inputs | `form_input()`, `form_select()`, `form_textarea()` |
| `tables.html` | Table components | `table_wrapper()`, `table_header()`, `table_empty_state()` |
| `cards.html` | Card layouts | `stat_card()`, `card()`, `info_card()` |
| `headers.html` | Page headers | `page_header()`, `page_header_flex()`, `refresh_button()` |
| `modals.html` | Modal dialogs | `modal()`, `confirm_modal()`, `job_details_modal()` |
| `tabs.html` | Tab navigation | `tabs_nav()`, `tabs_inline()`, `tab_button()` |
| `inputs.html` | Specialized inputs | `search_autocomplete()`, `number_stepper()` |

### Macro Usage Rules

#### RULE 1: Always Import Before Use

```jinja
{# ✅ CORRECT - Import at top of template #}
{% from 'shared/macros/tables.html' import table_wrapper, table_header %}
{% from 'shared/macros/pagination.html' import pagination %}

{% block content %}
    {% call table_wrapper() %}
        {{ table_header(['Name', 'Email', 'Status']) }}
        ...
    {% endcall %}
    {{ pagination() }}
{% endblock %}

{# ❌ WRONG - Inline HTML instead of macro #}
{% block content %}
    <div class="w-full overflow-hidden rounded-lg shadow-xs">
        <div class="w-full overflow-x-auto">
            <table class="w-full whitespace-no-wrap">
                ...
            </table>
        </div>
    </div>
{% endblock %}
```

#### RULE 2: Use Macros for Repeated Patterns

If you find yourself copying HTML more than once, create or use a macro.

```jinja
{# ✅ CORRECT - Using badge macro #}
{{ status_badge(status='active') }}
{{ status_badge(status='pending') }}
{{ status_badge(status='inactive') }}

{# ❌ WRONG - Copy-pasting badge HTML #}
<span class="px-2 py-1 text-xs font-semibold text-green-800 bg-green-100 rounded-full">Active</span>
<span class="px-2 py-1 text-xs font-semibold text-yellow-800 bg-yellow-100 rounded-full">Pending</span>
```

#### RULE 3: Use `{% call %}` for Wrapper Macros

Macros that wrap content use the `caller()` pattern:

```jinja
{# ✅ CORRECT - Using call block #}
{% call table_wrapper() %}
    {{ table_header(['Column 1', 'Column 2']) }}
    <tbody>...</tbody>
{% endcall %}

{% call tabs_nav() %}
    {{ tab_button('tab1', 'First Tab', icon='home') }}
    {{ tab_button('tab2', 'Second Tab', icon='cog') }}
{% endcall %}
```

#### RULE 4: Prefer Macro Parameters Over Custom CSS

```jinja
{# ✅ CORRECT - Using size parameter #}
{{ number_stepper(model='qty', size='sm') }}
{{ number_stepper(model='qty', size='lg') }}

{# ❌ WRONG - Adding custom classes #}
{{ number_stepper(model='qty') }}
<style>.my-stepper { transform: scale(0.8); }</style>
```

---

## Component Categories

### 1. Layout Components

#### Page Headers
```jinja
{% from 'shared/macros/headers.html' import page_header_flex, refresh_button %}

{% call page_header_flex(title='Page Title', subtitle='Optional description') %}
    {{ refresh_button(onclick='refreshData()') }}
    <button class="...">Add New</button>
{% endcall %}
```

#### Cards
```jinja
{% from 'shared/macros/cards.html' import stat_card %}

{{ stat_card(
    label='Total Users',
    value='1,234',
    icon='user-group',
    color='purple'
) }}
```

### 2. Data Display Components

#### Tables with Pagination
```jinja
{% from 'shared/macros/tables.html' import table_wrapper, table_header, table_empty_state %}
{% from 'shared/macros/pagination.html' import pagination %}

{% call table_wrapper() %}
    {{ table_header(['Name', 'Email', 'Status', 'Actions']) }}
    <tbody class="bg-white divide-y dark:divide-gray-700 dark:bg-gray-800">
        <template x-for="item in items" :key="item.id">
            <tr class="text-gray-700 dark:text-gray-400">
                ...
            </tr>
        </template>
    </tbody>
{% endcall %}

{{ table_empty_state(
    message='No items found',
    icon='inbox',
    show_condition='!loading && items.length === 0'
) }}

{{ pagination() }}
```

#### Badges
```jinja
{% from 'shared/macros/badges.html' import status_badge %}

{{ status_badge(status='active') }}      {# Green #}
{{ status_badge(status='pending') }}     {# Yellow #}
{{ status_badge(status='inactive') }}    {# Red #}
{{ status_badge(status='processing') }}  {# Blue #}
```

### 3. Form Components

#### Standard Inputs
```jinja
{% from 'shared/macros/forms.html' import form_input, form_select %}

{{ form_input(
    name='email',
    label='Email Address',
    type='email',
    model='formData.email',
    required=true,
    error_var='errors.email'
) }}

{{ form_select(
    name='status',
    label='Status',
    model='formData.status',
    options=[
        {'value': 'active', 'label': 'Active'},
        {'value': 'inactive', 'label': 'Inactive'}
    ]
) }}
```

#### Number Stepper
```jinja
{% from 'shared/macros/inputs.html' import number_stepper %}

{# Cart quantity #}
{{ number_stepper(model='quantity', min=1, max=99, size='md') }}

{# Batch size with step #}
{{ number_stepper(model='batchSize', min=100, max=5000, step=100, size='lg') }}
```

#### Search Autocomplete
```jinja
{% from 'shared/macros/inputs.html' import search_autocomplete, selected_item_display %}

{{ search_autocomplete(
    search_var='searchQuery',
    results_var='searchResults',
    show_dropdown_var='showDropdown',
    loading_var='searching',
    select_action='selectItem(item)',
    display_field='name',
    secondary_field='email',
    placeholder='Search users...'
) }}

{{ selected_item_display(
    selected_var='selectedUser',
    display_field='name',
    secondary_field='email',
    clear_action='clearSelection()'
) }}
```

### 4. Navigation Components

#### Tabs
```jinja
{% from 'shared/macros/tabs.html' import tabs_nav, tabs_inline, tab_button %}

{# Full-width navigation tabs #}
{% call tabs_nav() %}
    {{ tab_button('overview', 'Overview', icon='home') }}
    {{ tab_button('details', 'Details', icon='document') }}
    {{ tab_button('settings', 'Settings', icon='cog') }}
{% endcall %}

{# Inline tabs with counts #}
{% call tabs_inline() %}
    {{ tab_button('all', 'All', count_var='items.length') }}
    {{ tab_button('active', 'Active', count_var='activeCount') }}
    {{ tab_button('archived', 'Archived', count_var='archivedCount') }}
{% endcall %}
```

### 5. Feedback Components

#### Alerts
```jinja
{% from 'shared/macros/alerts.html' import alert_dynamic, loading_state, error_state %}

{{ alert_dynamic(type='success', message_var='successMessage', show_condition='successMessage') }}
{{ alert_dynamic(type='error', message_var='errorMessage', show_condition='errorMessage') }}

{{ loading_state(message='Loading data...', show_condition='loading') }}
{{ error_state(title='Error', show_condition='error') }}
```

#### Modals
```jinja
{% from 'shared/macros/modals.html' import confirm_modal %}

{{ confirm_modal(
    show_var='showDeleteModal',
    title='Confirm Delete',
    message='Are you sure you want to delete this item?',
    confirm_action='deleteItem()',
    confirm_text='Delete',
    confirm_class='bg-red-600 hover:bg-red-700'
) }}
```

---

## Dark Mode Requirements

Every component MUST support dark mode using Tailwind's `dark:` prefix.

### Color Pairing Reference

| Element | Light Mode | Dark Mode |
|---------|------------|-----------|
| Background | `bg-white` | `dark:bg-gray-800` |
| Card Background | `bg-gray-50` | `dark:bg-gray-900` |
| Text Primary | `text-gray-700` | `dark:text-gray-200` |
| Text Secondary | `text-gray-500` | `dark:text-gray-400` |
| Border | `border-gray-300` | `dark:border-gray-600` |
| Hover Background | `hover:bg-gray-100` | `dark:hover:bg-gray-700` |
| Input Background | `bg-white` | `dark:bg-gray-700` |
| Focus Ring | `focus:ring-purple-500` | `dark:focus:ring-purple-400` |

### Example
```html
<div class="bg-white dark:bg-gray-800 text-gray-700 dark:text-gray-200 border border-gray-300 dark:border-gray-600">
    <h3 class="text-gray-900 dark:text-gray-100">Title</h3>
    <p class="text-gray-500 dark:text-gray-400">Description</p>
</div>
```

---

## Accessibility Requirements

### Required ARIA Attributes

```html
{# Button with loading state #}
<button :aria-busy="loading" :disabled="loading">
    <span x-show="!loading">Submit</span>
    <span x-show="loading">Loading...</span>
</button>

{# Icon-only button #}
<button aria-label="Delete item" title="Delete">
    <span x-html="$icon('trash', 'w-4 h-4')"></span>
</button>

{# Number stepper group #}
<div role="group" aria-label="Quantity selector">
    <button aria-label="Decrease quantity">-</button>
    <input aria-label="Quantity" />
    <button aria-label="Increase quantity">+</button>
</div>
```

### Focus States

All interactive elements must have visible focus states:
```html
<button class="focus:outline-none focus:ring-2 focus:ring-purple-500 focus:ring-offset-2">
    Click me
</button>
```

---

## Icon System

### Usage
```html
{# Standard icon #}
<span x-html="$icon('user', 'w-5 h-5')"></span>

{# Icon with color #}
<span x-html="$icon('check-circle', 'w-5 h-5 text-green-500')"></span>

{# Inline icon in button #}
<button class="flex items-center">
    <span x-html="$icon('plus', 'w-4 h-4 mr-2')"></span>
    Add Item
</button>
```

### Common Icons Reference

| Icon | Usage |
|------|-------|
| `home` | Dashboard/Home |
| `user` | Users/Profile |
| `cog` | Settings |
| `plus` | Add/Create |
| `edit` | Edit/Modify |
| `trash` | Delete |
| `check-circle` | Success/Verified |
| `x-circle` | Error/Failed |
| `clock` | Pending/Time |
| `refresh` | Reload/Sync |
| `eye` | View/Details |
| `download` | Download/Export |
| `upload` | Upload/Import |
| `search` | Search |
| `filter` | Filter |
| `minus` | Decrease |

---

## Creating New Components

### When to Create a Macro

Create a new macro when:
- Pattern is used 3+ times across templates
- Component has configurable options
- Component requires consistent styling

### Macro Template
```jinja
{#
  Component Name
  ==============
  Brief description of what the component does.

  Parameters:
    - param1: Description (required/optional, default: value)
    - param2: Description

  Usage:
    {{ component_name(param1='value', param2='value') }}
#}
{% macro component_name(
    param1,
    param2='default'
) %}
<div class="...">
    {# Component HTML #}
</div>
{% endmacro %}
```

### Checklist for New Components

- [ ] Supports dark mode (`dark:` variants)
- [ ] Has ARIA labels for accessibility
- [ ] Documented with JSDoc-style comment
- [ ] Added to `/admin/components` page
- [ ] Added to this documentation
- [ ] Uses existing design tokens (colors, spacing)
- [ ] Tested in both light and dark mode
- [ ] Works on mobile viewport

---

## Component Reference Page

For live examples and copy-paste code, visit:

**Admin Panel:** `/admin/components`

This page includes:
- Interactive demos
- Code snippets with copy button
- All available macros
- Usage examples

---

## Related Documentation

- [UI Components Quick Reference](ui-components-quick-reference.md)
- [Icons Guide](../../development/icons-guide.md)
- [Tailwind CSS Guide](../tailwind-css.md)
- [Frontend Overview](../overview.md)
- [Architecture Rules](../../development/architecture-rules.md)
