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Filename : class-template-loader.php
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<?php
/**
 * Template loader.
 *
 * @package documentor
 */

if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

/**
 * Template Loader
 *
 * @class       Documentor_Template_Loader
 * @package     documentor
 */
class Documentor_Template_Loader {
    /**
     * Docs archive page ID
     *
     * @var int
     */
    private static $docs_archive_id = 0;

    /**
     * Hook in methods.
     */
    public static function init() {
        self::$docs_archive_id = documentor()->get_option( 'docs_page_id', 'documentor_settings', false );

        add_filter( 'template_include', array( __CLASS__, 'template_loader' ) );
	
		// To make the links like /docs/space/category/arctile-name to /docs/space/arctile-name
		add_filter('post_type_link', array( __CLASS__, 'permalink' ), 10001, 4);
    }

    /**
     * Load a template.
     *
     * Handles template usage so that we can use our own templates instead of the themes.
     *
     * Templates are in the 'templates' folder. documentor looks for theme.
     * overrides in /theme/documentor/ by default.
     *
     * @param string $template - template name.
     * @return string
     */
    public static function template_loader( $template ) {
        if ( is_embed() ) {
            return $template;
        }

        $default_file = self::get_template_loader_default_file();

        if ( $default_file ) {
            /**
             * Filter hook to choose which files to find before Documentor does it's own logic.
             *
             * @var array
             */
            $search_files = self::get_template_loader_files( $default_file );
            $template     = locate_template( $search_files );

            if ( ! $template ) {
                $template = documentor()->template_path . $default_file;
            }
			
			
        }

        return $template;
    }

    /**
     * Get the default filename for a template.
     *
     * @return string
     */
    private static function get_template_loader_default_file() {
        $default_file = '';

        if ( is_singular( 'docs' ) ) {
            $default_file = 'single.php';

            documentor()->is_single = true;
        } elseif ( is_post_type_archive( 'docs' ) || self::$docs_archive_id && is_page( self::$docs_archive_id ) ) {
            $default_file = 'archive.php';

            documentor()->is_archive = true;

            // Add query for page docs.
            global $wp_query;
            $args = array(
                'post_type'      => 'docs',
                'posts_per_page' => -1, // phpcs:ignore
                'post_parent'    => 0,
                'orderby'        => array(
                    'menu_order' => 'ASC',
                    'date'       => 'DESC',
                ),
            );

            // prepare args for search page.
            if ( ! is_admin() && is_search() ) {
                $default_file = 'search.php';

                unset( $args['posts_per_page'] );
                unset( $args['post_parent'] );

                $args['s'] = get_search_query();

                // phpcs:ignore
                $parent = isset( $_GET['child_of'] ) ? sanitize_text_field( wp_unslash( $_GET['child_of'] ) ) : false;
                $parent = intval( $parent );

                // we need to get all docs IDs and the use it in WP_Query as we need get also all childrens.
                if ( $parent ) {
                    $post__in      = array( $parent => $parent );
                    $children_docs = get_pages(
                        array(
                            'child_of'  => $parent,
                            'post_type' => 'docs',
                            'depth'     => -1,
                        )
                    );
                    if ( $children_docs ) {
                        $post__in = array_merge( $post__in, wp_list_pluck( $children_docs, 'ID' ) );
                    }
                    $args['post__in'] = $post__in;
                }
            }

            // make order by term.
            if ( 'archive.php' === $default_file ) {
                $categories = get_terms(
                    array(
                        'taxonomy'   => 'docs_category',
                        'hide_empty' => false,
                    )
                );

                // we need to make query and loop over items and sort it by term.
                if ( ! empty( $categories ) ) {
                    $docs_by_cat = array(
                        0 => array(),
                    );

                    // get all available terms in array.
                    foreach ( $categories as $cat ) {
                        $docs_by_cat[ $cat->slug ] = array();
                    }

                    // get parent docs.
                    $parent_docs = get_pages(
                        array(
                            'post_type'   => 'docs',
                            'parent'      => 0,
                            'sort_column' => 'menu_order',
                        )
                    );
                    if ( $parent_docs ) {
                        // set all doc IDs to array by terms.
                        foreach ( $parent_docs as $doc ) {
                            $term = get_the_terms( $doc, 'docs_category' );

                            if ( $term && ! empty( $term ) ) {
                                $term = $term[0]->slug;
                            } else {
                                $term = 0;
                            }

                            $docs_by_cat[ $term ][] = $doc->ID;
                        }

                        // add posts IDs in post__in.
                        if ( count( $docs_by_cat ) >= 2 ) {
                            $args['post__in'] = array();
                            foreach ( $docs_by_cat as $docs ) {
                                $args['post__in'] = array_merge( $args['post__in'], $docs );
                            }
                            $args['orderby'] = 'post__in';
                        }
                    }
                }
            }

            $wp_query = new WP_Query( $args ); // phpcs:ignore
        }

        return $default_file;
    }

    /**
     * Get an array of filenames to search for a given template.
     *
     * @param  string $default_file The default file name.
     * @return string[]
     */
    private static function get_template_loader_files( $default_file ) {
        $search_files = apply_filters( 'documentor_template_loader_files', array(), $default_file );

        if ( is_page_template() ) {
            $search_files[] = get_page_template_slug();
        }

        $search_files[] = '/documentor/' . $default_file;
        return array_unique( $search_files );
    }

	// Change the post permalink
	public static function permalink($post_link, $post, $leavename, $sample){
		
		// Only for docs type
		if($post->post_type == documentor()->post_type){
			//die(home_url('/docs').' - '.$post_link);
			
			$url = get_permalink( self::$docs_archive_id );
			
			// We need to clean extra parts in the docs
			$section = str_replace($url, '', $post_link);
			$section = str_replace(home_url(), '', $section); //in case the url dosent have custom post type
			$section = explode('/', trim($section, '/'));
			$count = count($section);
						
			//This is to reduce the URL length.
			if($count > 2) {
				for($i = 1; $i < ($count - 1); $i++){
					unset($section[$i]);
				}
			}
			
			$post_link = $url.implode('/', $section);
			//die($post_link);
			
		}
		
		return $post_link;
	}
}

Documentor_Template_Loader::init();