# AGENTS.md - QC Application Development Guide

This document provides guidelines for agentic coding agents working on this PHP QC (Quality Control) application built with CodeIgniter 4.

## Project Overview

This is a CodeIgniter 4 PHP application using SQL Server database for quality control data management. The app handles control tests, daily/monthly entries, and reporting. Uses Tailwind CSS and Alpine.js for UI.

## Build/Lint/Test Commands

```bash
# PHP syntax check single file
php -l app/Controllers/Dashboard.php

# PHP syntax check all files recursively
find . -name "*.php" -exec php -l {} \; 2>&1 | grep -v "No syntax errors"

# Run all PHPUnit tests
./vendor/bin/phpunit

# Run single test class
./vendor/bin/phpunit tests/unit/HealthTest.php

# Run single test method
./vendor/bin/phpunit tests/unit/HealthTest.php --filter=testIsDefinedAppPath

# Run with coverage report
./vendor/bin/phpunit --coverage-html coverage/

# Start development server
php spark serve
```

## Code Style Guidelines

### General Principles

- Follow CodeIgniter 4 MVC patterns
- Maintain consistency with surrounding code
- Keep files focused (<200 lines preferred)
- Use clear, descriptive names

### PHP Style

- Use `<?php` opening tag (not `<?` short tags)
- Enable strict types: `declare(strict_types=1);` at top of PHP files
- Use strict comparison (`===`, `!==`) over loose comparison
- Use `elseif` (one word) not `else if`
- Use parentheses with control structures for single statements
- Use 4 spaces for indentation (not tabs)
- Return types and typed properties required for new code:
  ```php
  public function index(): string
  {
      return view('layout', [...]);
  }
  ```

### Naming Conventions

- Classes: `PascalCase` (e.g., `Dashboard`, `DictTestModel`)
- Methods/functions: `$camelCase` (e.g., `getWithDept`, `saveResult`)
- Variables: `$camelCase` (e.g., `$dictTestModel`, `$resultData`)
- Constants: `UPPER_SNAKE_CASE`
- Views: `lowercase_with_underscores` (e.g., `dashboard.php`, `test_index.php`)
- Routes: kebab-case URLs (e.g., `/test/edit/(:num)` → `/test/edit/1`)

### CodeIgniter 4 Patterns

**Controllers** extend `App\Controllers\BaseController`:
```php
namespace App\Controllers;

use App\Models\DictTestModel;

class Test extends BaseController
{
    protected $dictTestModel;

    public function __construct()
    {
        $this->dictTestModel = new DictTestModel();
    }

    public function index(): string
    {
        $data = [
            'title' => 'Test Dictionary',
            'tests' => $this->dictTestModel->findAll(),
        ];

        return view('layout', [
            'content' => view('test/index', $data),
            'page_title' => 'Test Dictionary',
            'active_menu' => 'test'
        ]);
    }
}
```

**Models** extend `CodeIgniter\Model`:
```php
namespace App\Models;

use CodeIgniter\Model;

class TestModel extends Model
{
    protected $table            = 'dict_test';
    protected $primaryKey       = 'id';
    protected $returnType       = 'array';
    protected $useSoftDeletes   = false;
    protected $allowedFields    = ['deptid', 'name', 'unit', 'method'];
}
```

**Views** use PHP short tags `<?= ?>` for output:
```php
<div class="space-y-6">
    <h1 class="text-2xl font-bold"><?= $title ?></h1>
    <?php foreach ($tests as $test): ?>
    <div><?= $test['name'] ?></div>
    <?php endforeach; ?>
</div>
```

### Database Operations

- Configure connections in `app/Config/Database.php`
- Use CodeIgniter's Query Builder for queries
- Use parameterized queries to prevent SQL injection:
  ```php
  $builder = $this->db->table('results');
  $builder->select('*');
  $builder->where('control_ref_id', $controlId);
  $results = $builder->get()->getResultArray();
  ```
- For SQL Server, set `DBDriver` to `'SQLSRV'` in config

### Error Handling

- Use CodeIgniter's exception handling: `throw new \CodeIgniter\Exceptions\PageNotFoundException('Not found')`
- Return JSON responses for AJAX endpoints:
  ```php
  return $this->response->setJSON(['success' => true, 'data' => $results]);
  ```
- Use `log_message('error', $message)` for logging
- Validate input with `$this->validate()` in controllers

### Frontend (Tailwind CSS + Alpine.js)

The layout already includes Tailwind via CDN and Alpine.js:
```html
<script src="https://cdn.tailwindcss.com"></script>
<script defer src="https://cdn.jsdelivr.net/npm/alpinejs@3.x.x/dist/cdn.min.js"></script>
```

**Common JavaScript (`public/js/app.js`):**
- Contains global `App` object with shared utilities
- Handles sidebar toggle functionality
- Provides `App.showToast()`, `App.confirmSave()`, `App.closeAllModals()`
- Initialize with `App.init()` on DOMContentLoaded

**Page-Specific Alpine.js:**
- Complex Alpine.js components should be defined inline in the view PHP file
- Use `x-data` with an object containing all properties and methods
- Example:
  ```html
  <div x-data="{
      property1: '',
      property2: [],
      
      init() {
          // Initialization code
      },
      
      async loadData() {
          // Fetch and handle data
          App.showToast('Loaded successfully');
      }
  }">
      <!-- Component markup -->
  </div>
  ```

### File Organization

- Controllers: `app/Controllers/`
- Models: `app/Models/`
- Views: `app/Views/` (subfolders for modules: `entry/`, `test/`, `control/`, `report/`, `dept/`)
- Config: `app/Config/`
- Routes: `app/Config/Routes.php`

### Modal-based CRUD Pattern

All CRUD operations use a single modal dialog file (`dialog.php`) that handles both add and edit modes.

**File Naming:**
- Single dialog: `dialog.php` (no `_add` or `_edit` suffix)

**Controller Pattern:**
```php
class Dept extends BaseController
{
    protected $dictDeptModel;

    public function __construct()
    {
        $this->dictDeptModel = new DictDeptModel();
    }

    public function index(): string
    {
        $data = [
            'title' => 'Department Dictionary',
            'depts' => $this->dictDeptModel->findAll(),
        ];

        return view('layout', [
            'content' => view('dept/index', $data),
            'page_title' => 'Department Dictionary',
            'active_menu' => 'dept'
        ]);
    }

    public function save(): \CodeIgniter\HTTP\RedirectResponse
    {
        $data = ['name' => $this->request->getPost('name')];
        $this->dictDeptModel->insert($data);
        return redirect()->to('/dept');
    }

    public function update($id): \CodeIgniter\HTTP\RedirectResponse
    {
        $data = ['name' => $this->request->getPost('name')];
        $this->dictDeptModel->update($id, $data);
        return redirect()->to('/dept');
    }

    public function delete($id): \CodeIgniter\HTTP\RedirectResponse
    {
        $this->dictDeptModel->delete($id);
        return redirect()->to('/dept');
    }
}
```

**Dialog View Pattern (`dialog.php`):**
```php
<?php
$isEdit = isset($record);
$action = $isEdit ? '/controller/update/' . $record['id'] : '/controller/save';
$title = $isEdit ? 'Edit Title' : 'Add Title';
?>

<div x-data="{ open: false }">
    <?php if (!$isEdit): ?>
    <button @click="open = true" class="...">Add</button>
    <?php endif; ?>

    <div x-show="open" class="fixed inset-0 z-50 ..." style="display: none;">
        <h2 class="text-xl font-bold mb-4"><?= $title ?></h2>
        <form action="<?= $action ?>" method="post">
            <!-- Form fields with values from $record if edit mode -->
            <input type="text" name="name" value="<?= $record['name'] ?? '' ?>">
            <button type="submit"><?= $isEdit ? 'Update' : 'Save' ?></button>
        </form>
    </div>
</div>
```

**Index View Pattern (`index.php`):**
```php
<div class="space-y-6">
    <!-- Table with data attributes for edit/delete -->
    <table>
        <tbody>
            <?php foreach ($records as $record): ?>
            <tr>
                <td><?= $record['name'] ?></td>
                <td>
                    <button data-edit-id="<?= $record['id'] ?>" 
                            data-name="<?= $record['name'] ?>"
                            class="...">Edit</button>
                    <button data-delete-id="<?= $record['id'] ?>" 
                            class="...">Delete</button>
                </td>
            </tr>
            <?php endforeach; ?>
        </tbody>
    </table>
</div>

<!-- Dialog for add (no data passed) -->
<?= view('module/dialog') ?>

<script>
// All modal-related JS in index.php
document.querySelectorAll('[data-edit-id]').forEach(btn => {
    btn.addEventListener('click', function() {
        document.getElementById('editId').value = this.dataset.editId;
        document.getElementById('editName').value = this.dataset.name;
        document.getElementById('editModal').classList.remove('hidden');
    });
});

document.querySelectorAll('[data-delete-id]').forEach(btn => {
    btn.addEventListener('click', function() {
        if (confirm('Delete this record?')) {
            window.location.href = '/controller/delete/' + this.dataset.deleteId;
        }
    });
});
</script>
```

**Searchable Multi-Select:**
- Use Select2 for searchable dropdowns (already included in layout.php)
- Initialize with: `$('#selectId').select2({ placeholder: 'Search...', allowClear: true })`

### Security Considerations

- Use CodeIgniter's built-in CSRF protection (`$this->validate('csrf')`)
- Escape all output in views with `<?= ?>` (auto-escaped)
- Use `$this->request->getPost()` instead of `$_POST`
- Never commit `.env` files with credentials

## Common Operations

**Add a new CRUD resource:**
1. Create model in `app/Models/`
2. Create controller in `app/Controllers/`
3. Add routes in `app/Config/Routes.php`
4. Create views in `app/Views/[module]/`

**Add a menu item:**
- Add to sidebar in `app/Views/layout.php`
- Add route in `app/Config/Routes.php`
- Create controller method
- Set `active_menu` parameter in view() call