<?php

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namespace Hostinger;

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use Hostinger\Admin\PluginSettings;

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defined( 'ABSPATH' ) || exit;

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class LlmsTxtGenerator {

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public const HOSTINGER_LLMSTXT_FILENAME = 'llms.txt';

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public const HOSTINGER_LLMSTXT_SIGNATURE = '[comment]: # (Generated by Hostinger Tools Plugin)';

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protected const HOSTINGER_LLMSTXT_SUPPORTED_POST_TYPES = array(

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'post',

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'page',

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);

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protected const UTF8_BOM = "\xEF\xBB\xBF";

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protected PluginSettings $plugin_settings;

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public function __construct( PluginSettings $plugin_settings ) {

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$this->plugin_settings = $plugin_settings;

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add_action( 'init', array( $this, 'init' ) );

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}

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public function init(): void {

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if ( wp_doing_ajax() || wp_doing_cron() || ! current_user_can( 'manage_options' ) ) {

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return;

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}

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$settings = $this->plugin_settings->get_plugin_settings();

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if ( $settings->get_enable_llms_txt() && ! $this->llmstxt_file_exists() ) {

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$this->generate();

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}

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$this->init_hooks();

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}

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public function on_settings_update( bool $is_enabled ): void {

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if ( $is_enabled ) {

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$this->generate();

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} else {

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$this->delete();

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}

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}

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public function is_user_generated_file(): bool {

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if ( ! $this->llmstxt_file_exists() ) {

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return false;

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}

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global $wp_filesystem;

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$this->init_wp_filesystem();

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$content = $wp_filesystem->get_contents( $this->get_llmstxt_file_path() );

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if ( $content === false ) {

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return false;

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}

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return ! str_contains( $content, self::HOSTINGER_LLMSTXT_SIGNATURE );

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}

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public function on_post_status_change( string $new_status, string $old_status, \WP_Post $post ): void {

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if ( ! $this->is_post_type_supported( $post->post_type ) ) {

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return;

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}

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if ( $new_status === 'publish' || $old_status === 'publish' ) {

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$this->generate();

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}

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}

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public function on_blog_change( mixed $old_value, mixed $new_value ): void {

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if ( $old_value !== $new_value ) {

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$this->generate();

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}

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}

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public function get_content(): string {

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$content = self::UTF8_BOM;

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$content .= $this->inject_title();

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$content .= $this->inject_site_description();

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$content .= $this->inject_items( $this->get_by_post_type( 'post' ), 'Posts' );

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$content .= $this->inject_items( $this->get_by_post_type( 'page' ), 'Pages' );

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$content .= $this->inject_signature();

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return $content;

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}

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public function init_hooks(): void {

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add_action( 'transition_post_status', array( $this, 'on_post_status_change' ), 10, 3 );

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add_action( 'hostinger_tools_setting_enable_llms_txt_update', array( $this, 'on_settings_update' ) );

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add_action( 'update_option_blogname', array( $this, 'on_blog_change' ), 10, 2 );

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add_action( 'update_option_blogdescription', array( $this, 'on_blog_change' ), 10, 2 );

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}

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protected function generate(): void {

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if ( $this->is_user_generated_file() ) {

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return;

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}

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global $wp_filesystem;

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$this->init_wp_filesystem();

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$wp_filesystem->put_contents( $this->get_llmstxt_file_path(), $this->get_content() );

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}

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protected function delete(): void {

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if ( $this->llmstxt_file_exists() && ! $this->is_user_generated_file() ) {

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global $wp_filesystem;

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$this->init_wp_filesystem();

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$wp_filesystem->delete( $this->get_llmstxt_file_path() );

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}

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}

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protected function get_llmstxt_file_path(): string {

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return ABSPATH . self::HOSTINGER_LLMSTXT_FILENAME;

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}

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protected function llmstxt_file_exists(): bool {

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return file_exists( $this->get_llmstxt_file_path() );

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}

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protected function is_post_type_supported( string $post_type ): bool {

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return in_array( $post_type, self::HOSTINGER_LLMSTXT_SUPPORTED_POST_TYPES, true );

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}

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protected function get_by_post_type( string $post_type, int $limit = 100 ): array {

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$args = array(

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'post_type' => $post_type,

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'post_status' => 'publish',

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'fields' => 'ids',

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'posts_per_page' => apply_filters( 'hostinger_llmstext_item_limit', $limit, $post_type ),

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);

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return get_posts( $args );

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}

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protected function inject_site_description(): string {

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$description = get_bloginfo( 'description' );

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return $description ? "> $description\n\n" : '';

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}

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protected function inject_title(): string {

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$title = get_bloginfo( 'name' ) ? get_bloginfo( 'name' ) : site_url();

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return "# $title\n\n";

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}

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protected function inject_signature(): string {

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return "\n\n" . self::HOSTINGER_LLMSTXT_SIGNATURE;

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}

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protected function inject_items( array $items, string $title ): string {

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if ( empty( $items ) ) {

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return '';

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}

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$content = "\n## $title\n\n";

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foreach ( $items as $item ) {

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$post = get_post( $item );

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$title = $post->post_title;

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$permalink = get_permalink( $post );

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$excerpt = $this->prepare_excerpt( $post );

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$content .= "- [$title]($permalink)";

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if ( $excerpt ) {

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$content .= ": $excerpt";

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}

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$content .= "\n";

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}

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return $content;

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}

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protected function prepare_excerpt( \WP_Post $item ): string {

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return html_entity_decode( wp_trim_excerpt( $item->post_excerpt, $item ) );

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}

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protected function init_wp_filesystem() {

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global $wp_filesystem;

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require_once ABSPATH . '/wp-admin/includes/file.php';

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WP_Filesystem();

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}

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}

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