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<?php
namespace Depicter\Front;


use Averta\Core\Utility\Arr;
use Averta\WordPress\Cache\WPCache;
use Averta\WordPress\Utility\JSON;
use Depicter\Exception\DocumentNotPublished;
use Depicter\Utility\Sanitize;

class Render
{
	/**
	 * @var WPCache
	 */
	private $cache;

	public function __construct(){
		$this->cache = \Depicter::cache('document');
	}

	/**
	 * Retrieves or renders a document markup
	 *
	 * @param int|string   $documentID  Document ID or alias
	 * @param array        $args        Retrieve params
	 *
	 * @return string|void
	 */
	public function document( $documentID = 0, $args = [] ){
		$isPrivilegedUser = \Depicter::authorization()->currentUserCanPublishDocument();

		$args = Arr::merge( $args, [
			'loadStyleMode' => 'auto',// ["auto", "inline", "file"]."auto" loads custom css if available, otherwise prints styles inline
			'useCache'      => true,
			'echo'          => true,
			'status'        => 'publish',
			'showAdminNotice' => $isPrivilegedUser
		]);

		if ( $args['isPrivilegedUser'] = $isPrivilegedUser ) {
			$args['status']        = ['publish', 'draft', 'future'];
			$args['useCache']      = false;
			$args['loadStyleMode'] = 'inline';
		}

		$output = $this->getDocument( $documentID, $args ); // retrieves escaped slider markup

		if ( !empty( $output ) ) {
			// Fallback to load missing asset files of a document
			\Depicter::front()->assets()->enqueueAssets( $documentID, $isPrivilegedUser );
		}

		if( $args['echo'] ){
			echo $output; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
		} else {
			return $output;
		}
	}

	/**
	 * Retrieves a document markup
	 *
	 * @param int|string   $documentID  Document ID or alias
	 * @param array        $args        Retrieve params
	 *
	 * @return string
	 */
	protected function getDocument( $documentID = '', $args = [] )
	{
		if ( empty( $documentID ) ) {
	        return esc_html__( 'Slider ID is required.', 'depicter' );
	    }

		if( ! \Depicter::document()->displayRules( $documentID )->isVisible( $args ) ){
			return '';
		}

		if( $args['useCache'] && ( false !== $cacheOutput = $this->getDocumentCache( $documentID, $args ) ) ){
			return $cacheOutput;
		}

		$output = '';
		$where  = [ 'status' => $args['status'] ];

		$styleGeneratorArgs = isset( $args['addImportant'] ) ? [ 'addImportant' => $args['addImportant'] ] : [];

		try{
			if( ! $documentID = \Depicter::document()->getID( $documentID ) ){
				return esc_html__( 'Slider alias not found.', 'depicter' );
			}

			if( ! $args['showAdminNotice'] && ! \Depicter::document()->repository()->isPublishedBefore( $documentID ) ) {
				throw new DocumentNotPublished( __( 'Slider is not published yet and saved as "draft"', 'depicter' ), 0, $where );
			}

			if( $documentModel = \Depicter::document()->getModel( $documentID, $where ) ){

				$documentModel->setShowAdminNotice( $args['showAdminNotice'] );

				$output .= $documentModel->prepare()->render();

				$documentModel->styleGenerator( $styleGeneratorArgs );

				if( $args['isPrivilegedUser'] && \Depicter::document()->repository()->isPublished( $documentID ) ){
					$documentModel->saveCss();
				}

				if( ( $args['loadStyleMode'] == 'inline' ) ){
					$output = $documentModel->getInlineCssTag() . $output;

				// fallback to inline if css file cannot be generated
				} elseif( in_array( $args['loadStyleMode'], [ 'auto', 'file' ] ) ) {
					if( ! $documentModel->getCssFileUrl() ){
						$output = $documentModel->getInlineCssTag() . $output;
					}
				}

				$output = $documentModel->getBeforeInitCssAndTag() . $output;

				//----------

				$cssLinksToEnqueue = $documentModel->getCustomCssFiles( 'all' );

				$this->cache->set( $documentID . '_css_files', $cssLinksToEnqueue, WEEK_IN_SECONDS );

				if( $firstSection = $documentModel->getSectionNth(1) ){
					$preloadTags = $firstSection->getPreloadTags();
					$this->cache->set( $documentID . '_preload_tags', $preloadTags, WEEK_IN_SECONDS );
				}

				// sanitize the output before caching
		        $output = Sanitize::html( $output, null, 'depicter/output' );

				if( $args['useCache'] ){
					$this->setDocumentCache( $documentID, $output, $args );
				} else {
					$this->deleteDocumentCache( $documentID, $args );
				}
			}

		} catch( \Exception $exception ){
			$output = Sanitize::html( $exception->getMessage() );
		}

		return $output;
	}

	/**
	 * Retrieves the cached markup and enqueues custom styles
	 *
	 * @param int   $documentID
	 * @param array $args
	 *
	 * @return bool|mixed
	 */
	protected function getDocumentCache( $documentID, $args = [] ){
		if( ( false !== $cacheOutput = $this->cache->get( $this->getDocumentCacheKey( $documentID, $args ) ) ) && !empty( $cacheOutput ) ){
			return $cacheOutput;
		}
		return false;
	}

	/**
	 * Cache markup and styles
	 *
	 * @param int    $documentID
	 * @param string $content
	 * @param array  $args
	 *
	 * @return bool
	 */
	protected function setDocumentCache( $documentID, $content, $args = [] ): bool{
		return $this->cache->set( $this->getDocumentCacheKey( $documentID, $args ), $content, 4 * DAY_IN_SECONDS );
	}

	/**
	 * Flushes a document cache
	 *
	 * @param int    $documentID
	 * @param array  $args
	 *
	 * @return bool
	 */
	protected function deleteDocumentCache( $documentID, $args = [] ){
		return $this->cache->delete( $this->getDocumentCacheKey( $documentID, $args ) );
	}

	/**
	 * Flushes entire document cache
	 *
	 * @param int    $documentID
	 */
	public function flushDocumentCache( $documentID ){
		$this->cache->delete( $documentID ."_auto" );
		$this->cache->delete( $documentID ."_inline" );
		$this->cache->delete( $documentID ."_css_files" );
	}

	protected function getDocumentCacheKey( $documentID = '', $args = [] ){
		// type of loading style
		$loadStyleMode = $args['loadStyleMode'] ?? 'auto';
		// whether addImportant option is enabled for styles or not
		$addImportant  = !empty( $args['addImportant'] ) ? '1' : '0';
		// If the cache is for logged-in users or not (visitors)
		$cacheFor      = !empty( $args['isPrivilegedUser'] ) ? 'admin_' : '';
		// Include admin notice in document markup or not
		$isAdminNoticeEnabled = !empty( $args['showAdminNotice'] ) ? 'notice_' : '';
		// The last modified date of main document
		$modifiedAt = \Depicter::documentRepository()->getFieldValue( $documentID, 'modified_at');
		$documentModifiedTime = $modifiedAt ? strtotime( $modifiedAt ): '0';

		return "{$documentID}_{$loadStyleMode}_{$cacheFor}{$isAdminNoticeEnabled}{$addImportant}{$documentModifiedTime}";
	}
}