<?php
/**
* @author Amasty Team
* @copyright Copyright (c) 2022 Amasty (https://www.amasty.com)
* @package Magento 2 Base Package
*/

namespace Amasty\Base\Plugin\Frontend;

use Amasty\Base\Model\LessToCss\Config\Converter;
use Magento\Framework\App\CacheInterface;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\View\Asset\File;
use Magento\Framework\View\Page\Config;
use Magento\Framework\View\Page\Config\Renderer;
use Magento\Store\Model\ScopeInterface;
use Magento\Framework\View\Design\Theme\ThemeProviderInterface;
use Magento\Framework\App\ObjectManager;

class AddAssets
{
public const CACHE_KEY = 'amasty_should_load_css_files';

/**
* @var string[]
*/
protected $filesToCheck = ['css/styles-l.css', 'css/styles-m.css'];

/**
* @var Config
*/
private $config;

/**
* @var CacheInterface
*/
private $cache;

/**
* @var \Amasty\Base\Model\LessToCss\Config
*/
private $lessConfig;

/**
* @var \Magento\Framework\View\LayoutInterface
*/
private $layout;

/**
* @var ScopeConfigInterface
*/
private $scopeConfig;

/**
* @var \Magento\Framework\View\Design\FileResolution\Fallback\StaticFile
*/
private $fallback;

/**
* @var ThemeProviderInterface
*/
private $themeProvider;

/**
* @var \Magento\Framework\View\DesignInterface
*/
private $design;

public function __construct(
Config $config,
CacheInterface $cache,
\Amasty\Base\Model\LessToCss\Config $lessConfig,
\Magento\Framework\View\LayoutInterface $layout,
ScopeConfigInterface $scopeConfig,
\Magento\Framework\View\Design\FileResolution\Fallback\StaticFile $fallback,
\Magento\Framework\View\DesignInterface $design
) {
$this->config = $config;
$this->cache = $cache;
$this->lessConfig = $lessConfig;
$this->layout = $layout;
$this->scopeConfig = $scopeConfig;
$this->fallback = $fallback;
$this->design = $design;
}

/**
* Add our css files if less functionality for theme is missing
*
* @param Renderer $subject
* @param array $resultGroups
*
* @return array
*/
public function beforeRenderAssets(Renderer $subject, $resultGroups = [])
{
$theme = $this->design->getDesignTheme();
$cacheKey = self::CACHE_KEY . $theme->getCode();
/** @var bool|int $shouldLoad */
$shouldLoad = $this->cache->load($cacheKey);
if ($shouldLoad === false) {
$shouldLoad = $this->isShouldLoadCss();
$this->cache->save($shouldLoad, $cacheKey);
}

if ($shouldLoad) {
$modulesConfig = $this->lessConfig->get();
$currentHandles = $this->layout->getUpdate()->getHandles();
foreach ($modulesConfig as $moduleName => $moduleConfig) {
foreach ($moduleConfig[Converter::IFCONFIG] as $configPath) {
if (!$this->scopeConfig->isSetFlag($configPath, ScopeInterface::SCOPE_STORE)) {
continue 2;
}
}
foreach ($moduleConfig[Converter::HANDLES] as $handle) {
if (in_array($handle, $currentHandles, true)) {
$this->addCss($moduleName, $moduleConfig[Converter::CSS_OPTIONS]);
continue 2;
}
}
}
}

return [$resultGroups];
}

/**
* @param string $moduleName
* @param array $moduleConfig
*/
private function addCss($moduleName, $moduleConfig)
{
// i.e. 'Amasty_Checkout::css/styles.css'
$cssPath = $moduleName . '::' . $moduleConfig[Converter::CSS_OPTION_PATH]
. '/' . $moduleConfig[Converter::CSS_OPTION_FILENAME] . '.css';

$this->config->addPageAsset($cssPath);
}

/**
* @return int
*/
private function isShouldLoadCss()
{
/** @var \Magento\Framework\View\Asset\GroupedCollection $collection */
$collection = $this->config->getAssetCollection();
$found = 0;
$shouldFind = count($this->filesToCheck);
/** @var File $item */
foreach ($collection->getAll() as $item) {
if ($item instanceof File
&& in_array($item->getFilePath(), $this->filesToCheck, true)
) {
$found++;
if ($found === $shouldFind && $this->findLess($item) === false) {
//styles with usual name founded, but this styles dont have less
return 1;
}
}
}

return (int)($found < $shouldFind);
}

/**
* @param File $asset
*
* @return bool|string
*/
private function findLess(File $asset)
{
try {
/** @var \Magento\Framework\View\Asset\File\FallbackContext $context */
$context = $asset->getContext();

$themeModel = $this->getThemeProvider()->getThemeByFullPath(
$context->getAreaCode() . '/' . $context->getThemePath()
);
$path = preg_replace('#\.css$#', '.less', $asset->getFilePath());

$sourceFile = $this->fallback->getFile(
$context->getAreaCode(),
$themeModel,
$context->getLocale(),
$path,
$asset->getModule()
);
} catch (\Exception $e) {
return false;
}

return $sourceFile;
}

/**
* @return ThemeProviderInterface
*/
private function getThemeProvider()
{
if (null === $this->themeProvider) {
$this->themeProvider = ObjectManager::getInstance()->get(ThemeProviderInterface::class);
}

return $this->themeProvider;
}
}