<?php
/**
 * FiveNamesLlmTxt_Admin
 * Registreert het admin-menu, enqueues assets en verwerkt AJAX-verzoeken.
 */
class FiveNamesLlmTxt_Admin {

    /** @var FiveNamesLlmTxt_File_Manager */
    private $fm;

    /** @var FiveNamesLlmTxt_Generator */
    private $gen;

    /** @var FiveNamesLlmTxt_History */
    private $history;

    /** @var FiveNamesLlmTxt_Importer */
    private $importer;

    public function __construct() {
        $this->fm       = new FiveNamesLlmTxt_File_Manager();
        $this->gen      = new FiveNamesLlmTxt_Generator();
        $this->history  = new FiveNamesLlmTxt_History();
        $this->importer = new FiveNamesLlmTxt_Importer();

        add_action( 'admin_menu',            [ $this, 'register_menu' ] );
        add_action( 'admin_enqueue_scripts', [ $this, 'enqueue_assets' ] );
        add_action( 'admin_notices',         [ $this, 'show_notices' ] );

        add_action( 'wp_ajax_fivenames_llmtxt_save',           [ $this, 'ajax_save' ] );
        add_action( 'wp_ajax_fivenames_llmtxt_preview',        [ $this, 'ajax_preview' ] );
        add_action( 'wp_ajax_fivenames_llmtxt_restore',        [ $this, 'ajax_restore' ] );
        add_action( 'wp_ajax_fivenames_llmtxt_import',         [ $this, 'ajax_import' ] );
        add_action( 'wp_ajax_fivenames_llmtxt_save_raw',       [ $this, 'ajax_save_raw' ] );
        add_action( 'wp_ajax_fivenames_llmtxt_dismiss_notice', [ $this, 'ajax_dismiss_notice' ] );
    }

    public function register_menu() {
        add_options_page(
            __( 'LLMs.txt Settings', '5names-llms-txt-manager' ),
            __( 'LLMs.txt', '5names-llms-txt-manager' ),
            'manage_options',
            '5names-llms-txt-manager', [ $this, 'render_page' ]
        );
    }

    public function enqueue_assets( $hook ) {
        if ( 'settings_page_5names-llms-txt-manager' !== $hook ) return;

        wp_enqueue_style(
            'fivenames-llmtxt-admin', FIVENAMES_LLMTXT_URL . 'admin/llms-admin.css', [], FIVENAMES_LLMTXT_VERSION
        );
        wp_enqueue_script(
            'fivenames-llmtxt-admin', FIVENAMES_LLMTXT_URL . 'admin/llms-admin.js',
            [ 'jquery' ], FIVENAMES_LLMTXT_VERSION, true
        );

        $settings = get_option( 'fivenames_llmtxt_settings', [] );
        wp_localize_script( 'fivenames-llmtxt-admin', 'fivenamesLlmtxtData', [
            'nonce'    => wp_create_nonce( 'fivenames_llmtxt_nonce' ),
            'ajaxurl'  => admin_url( 'admin-ajax.php' ),
            'sections' => ! empty( $settings['sections'] ) ? $settings['sections'] : [],
            'i18n'     => [
                'confirmDeleteSection' => __( 'Delete this section and all its links?', '5names-llms-txt-manager' ),
                'confirmRestore'       => __( 'Overwrite the current llms.txt with this backup? This cannot be undone.', '5names-llms-txt-manager' ),
                'saveRawLabel'         => __( 'Save source to file', '5names-llms-txt-manager' ),
                'saveVisualLabel'      => __( 'Save & write to file', '5names-llms-txt-manager' ),
                'connectionError'      => __( 'Connection error — please try again.', '5names-llms-txt-manager' ),
                'importing'            => __( 'Importing…', '5names-llms-txt-manager' ),
                'importButton'         => __( 'Import existing file', '5names-llms-txt-manager' ),
                'unknownError'         => __( 'Unknown error', '5names-llms-txt-manager' ),
                'errorPrefix'          => __( 'Error: ', '5names-llms-txt-manager' ),
                'restoring'            => __( 'Restoring…', '5names-llms-txt-manager' ),
                'restoreButton'        => __( 'Restore', '5names-llms-txt-manager' ),
                'labelPlaceholder'     => __( 'Label', '5names-llms-txt-manager' ),
                'urlPlaceholder'       => __( 'https://...', '5names-llms-txt-manager' ),
                'descPlaceholder'      => __( 'Short description (optional)', '5names-llms-txt-manager' ),
                'removeLink'           => __( 'Remove link', '5names-llms-txt-manager' ),
                'moveUp'               => __( 'Move up', '5names-llms-txt-manager' ),
                'moveDown'             => __( 'Move down', '5names-llms-txt-manager' ),
                'sectionNamePlaceholder' => __( 'Section name (e.g. Competitions)', '5names-llms-txt-manager' ),
                'removeSection'        => __( 'Remove section', '5names-llms-txt-manager' ),
                'addLink'              => __( 'Add link', '5names-llms-txt-manager' ),
            ],
        ] );
    }

    public function render_page() {
        if ( ! current_user_can( 'manage_options' ) ) {
            wp_die( esc_html__( 'Access denied.', '5names-llms-txt-manager' ) );
        }

        $settings          = get_option( 'fivenames_llmtxt_settings', [] );
        $cpts              = $this->gen->get_custom_post_types();
        $backups           = $this->history->get_backups();
        $preview           = $this->gen->generate( $settings );
        $file_manager      = $this->fm;
        $generator         = $this->gen;
        $raw_content       = $this->fm->read();
        $has_import_notice = (bool) get_transient( 'fivenames_llmtxt_existing_file_notice' );
        $sitemap_provider  = $this->gen->detect_sitemap_provider();
        $sitemap_url       = $this->gen->get_sitemap_url();

        include FIVENAMES_LLMTXT_PATH . 'admin/settings-page.php';
    }

    // ── AJAX: opslaan (visueel) ───────────────────────────────────

    public function ajax_save() {
        check_ajax_referer( 'fivenames_llmtxt_nonce', 'nonce' );
        if ( ! current_user_can( 'manage_options' ) ) wp_die();

        if ( ! $this->fm->is_writable() ) {
            wp_send_json_error( [ 'message' => sprintf(
                /* translators: %s: absolute path to the llms.txt file */
                __( 'No write permission for %s.', '5names-llms-txt-manager' ),
                esc_html( FIVENAMES_LLMTXT_FILE )
            ) ] );
        }

        $settings = $this->sanitize_settings( $_POST );
        update_option( 'fivenames_llmtxt_settings', $settings );

        if ( $this->fm->exists() ) {
            $this->history->backup( $this->fm->read() );
        }

        $content = $this->gen->generate( $settings );
        $written = $this->fm->write( $content );

        if ( $written ) {
            $this->maybe_fire_webhook( $settings );
            wp_send_json_success( [
                'message' => sprintf(
                    /* translators: %s: date and time of the save, in UTC */
                    __( 'Saved &amp; written on %s UTC.', '5names-llms-txt-manager' ),
                    gmdate( 'd-m-Y H:i:s' )
                ),
                'content' => $content,
                'size'    => size_format( strlen( $content ) ),
            ] );
        } else {
            wp_send_json_error( [ 'message' => __( 'Save failed — check the file permissions.', '5names-llms-txt-manager' ) ] );
        }
    }

    // ── AJAX: opslaan (broncode) ──────────────────────────────────

    public function ajax_save_raw() {
        check_ajax_referer( 'fivenames_llmtxt_nonce', 'nonce' );
        if ( ! current_user_can( 'manage_options' ) ) wp_die();

        if ( ! $this->fm->is_writable() ) {
            wp_send_json_error( [ 'message' => sprintf(
                /* translators: %s: absolute path to the llms.txt file */
                __( 'No write permission for %s.', '5names-llms-txt-manager' ),
                esc_html( FIVENAMES_LLMTXT_FILE )
            ) ] );
        }

        $content = isset( $_POST['content'] ) ? wp_strip_all_tags( wp_unslash( $_POST['content'] ) ) : '';
        $content = str_replace( [ "\0", "\r\n", "\r" ], [ '', "\n", "\n" ], $content );

        if ( $this->fm->exists() ) {
            $this->history->backup( $this->fm->read() );
        }

        $written = $this->fm->write( $content );

        if ( $written ) {
            $settings = get_option( 'fivenames_llmtxt_settings', [] );
            $this->maybe_fire_webhook( $settings );
            wp_send_json_success( [
                'message' => sprintf(
                    /* translators: %s: date and time of the save, in UTC */
                    __( 'Source saved on %s UTC.', '5names-llms-txt-manager' ),
                    gmdate( 'd-m-Y H:i:s' )
                ),
                'size'    => size_format( strlen( $content ) ),
            ] );
        } else {
            wp_send_json_error( [ 'message' => __( 'Save failed — check the file permissions.', '5names-llms-txt-manager' ) ] );
        }
    }

    // ── AJAX: voorbeeld ───────────────────────────────────────────

    public function ajax_preview() {
        check_ajax_referer( 'fivenames_llmtxt_nonce', 'nonce' );
        if ( ! current_user_can( 'manage_options' ) ) wp_die();

        $settings = $this->sanitize_settings( $_POST );
        wp_send_json_success( [ 'content' => $this->gen->generate( $settings ) ] );
    }

    // ── AJAX: herstellen ──────────────────────────────────────────

    public function ajax_restore() {
        check_ajax_referer( 'fivenames_llmtxt_nonce', 'nonce' );
        if ( ! current_user_can( 'manage_options' ) ) wp_die();

        $index  = isset( $_POST['index'] ) ? intval( $_POST['index'] ) : 0;
        $result = $this->history->restore( $index );

        if ( $result ) {
            wp_send_json_success( [ 'message' => __( 'Backup restored as the active llms.txt.', '5names-llms-txt-manager' ) ] );
        } else {
            wp_send_json_error( [ 'message' => __( 'Restore failed — backup not found.', '5names-llms-txt-manager' ) ] );
        }
    }

    // ── AJAX: importeer bestaand bestand ──────────────────────────

    public function ajax_import() {
        check_ajax_referer( 'fivenames_llmtxt_nonce', 'nonce' );
        if ( ! current_user_can( 'manage_options' ) ) wp_die();

        if ( ! $this->fm->exists() ) {
            wp_send_json_error( [ 'message' => __( 'No existing llms.txt file found.', '5names-llms-txt-manager' ) ] );
        }

        $content = $this->fm->read();
        $parsed  = $this->importer->parse( $content );
        $summary = $this->importer->summarize( $parsed );

        // Bestaande webhook-instelling bewaren (staat niet in het bestand).
        $existing = get_option( 'fivenames_llmtxt_settings', [] );
        if ( ! empty( $existing['webhook_url'] ) && empty( $parsed['webhook_url'] ) ) {
            $parsed['webhook_url'] = $existing['webhook_url'];
        }

        update_option( 'fivenames_llmtxt_settings', $parsed );
        delete_transient( 'fivenames_llmtxt_existing_file_notice' );

        wp_send_json_success( [
            'message' => sprintf(
                /* translators: %s: summary of what was imported, e.g. "3 sections, 5 links imported." */
                __( 'Import successful! %s Reloading page&hellip;', '5names-llms-txt-manager' ),
                $summary
            ),
        ] );
    }

    // ── AJAX: verberg activeringsmelding ──────────────────────────

    public function ajax_dismiss_notice() {
        check_ajax_referer( 'fivenames_llmtxt_nonce', 'nonce' );
        if ( ! current_user_can( 'manage_options' ) ) wp_die();
        delete_transient( 'fivenames_llmtxt_existing_file_notice' );
        wp_send_json_success();
    }

    // ── Notices ───────────────────────────────────────────────────

    public function show_notices() {
        if ( ! current_user_can( 'manage_options' ) ) return;

        // Bestaand-bestand-melding (op alle admin-pagina's).
        if ( get_transient( 'fivenames_llmtxt_existing_file_notice' ) ) {
            $settings_url = admin_url( 'options-general.php?page=5names-llms-txt-manager' );
            echo '<div class="notice notice-warning" id="llms-existing-notice">';
            echo '<p><strong>' . esc_html__( '5Names LLMs.txt Manager:', '5names-llms-txt-manager' ) . '</strong> ';
            printf(
                /* translators: %s: link to the plugin settings page */
                wp_kses( __( 'An <code>/llms.txt</code> file already exists. %s and click <strong>Import existing file</strong> to load the current content as a starting point.', '5names-llms-txt-manager' ), [ 'code' => [], 'strong' => [] ] ),
                '<a href="' . esc_url( $settings_url ) . '">' . esc_html__( 'Go to Settings &rarr; LLMs.txt', '5names-llms-txt-manager' ) . '</a>'
            );
            echo '</p>';
            echo '<button type="button" class="notice-dismiss" id="llms-dismiss-notice" ';
            echo 'data-nonce="' . esc_attr( wp_create_nonce( 'fivenames_llmtxt_nonce' ) ) . '" ';
            echo 'data-ajaxurl="' . esc_attr( admin_url( 'admin-ajax.php' ) ) . '">';
            echo '<span class="screen-reader-text">' . esc_html__( 'Dismiss this notice.', '5names-llms-txt-manager' ) . '</span></button>';
            echo '</div>';
        }

        // Schrijfrechten-melding (alleen op de instellingenpagina).
        $screen = get_current_screen();
        if ( $screen && 'settings_page_5names-llms-txt-manager' === $screen->id && ! $this->fm->is_writable() ) {
            echo '<div class="notice notice-error"><p>';
            echo '<strong>' . esc_html__( '5Names LLMs.txt Manager:', '5names-llms-txt-manager' ) . '</strong> ';
            printf(
                /* translators: %s: absolute path to the WordPress root directory */
                wp_kses( __( 'The directory %s is <strong>not writable</strong>. Fix the file permissions (<code>chmod 755</code>).', '5names-llms-txt-manager' ), [ 'strong' => [], 'code' => [] ] ),
                '<code>' . esc_html( ABSPATH ) . '</code>'
            );
            echo '</p></div>';
        }
    }

    // ── Privé ─────────────────────────────────────────────────────

    private function maybe_fire_webhook( array $settings ) {
        $url = ! empty( $settings['webhook_url'] ) ? $settings['webhook_url'] : '';
        if ( ! $url || ! filter_var( $url, FILTER_VALIDATE_URL ) ) return;

        wp_remote_get( $url, [
            'timeout'    => 5,
            'blocking'   => false,
            'user-agent' => 'LLMsTxt-Manager/' . FIVENAMES_LLMTXT_VERSION . ' (WordPress)',
        ] );
    }

    private function sanitize_settings( array $data ) {
        $s = [];

        $s['auto_description']     = ! empty( $data['auto_description'] )  && '1' === $data['auto_description'];
        $s['auto_pages']           = ! empty( $data['auto_pages'] )         && '1' === $data['auto_pages'];
        $s['auto_categories']      = ! empty( $data['auto_categories'] )    && '1' === $data['auto_categories'];
        $s['auto_sitemap']         = ! empty( $data['auto_sitemap'] )       && '1' === $data['auto_sitemap'];
        $s['optional_description'] = sanitize_textarea_field( wp_unslash( $data['optional_description'] ?? '' ) );
        $s['webhook_url']          = esc_url_raw( wp_unslash( $data['webhook_url'] ?? '' ) );

        $cpts = [];
        if ( ! empty( $data['auto_cpt'] ) && is_array( $data['auto_cpt'] ) ) {
            foreach ( $data['auto_cpt'] as $cpt ) {
                $cpts[] = sanitize_key( $cpt );
            }
        }
        $s['auto_cpt'] = $cpts;

        $sections_raw = isset( $data['sections'] ) ? wp_unslash( $data['sections'] ) : '[]';
        $decoded      = is_string( $sections_raw ) ? json_decode( $sections_raw, true ) : [];
        $decoded      = is_array( $decoded ) ? $decoded : [];

        $sections = [];
        foreach ( $decoded as $section ) {
            $clean = [
                'name'  => sanitize_text_field( $section['name'] ?? '' ),
                'links' => [],
            ];
            foreach ( ( $section['links'] ?? [] ) as $link ) {
                $url = esc_url_raw( $link['url'] ?? '' );
                if ( ! $url ) continue;
                $clean['links'][] = [
                    'label' => sanitize_text_field( $link['label'] ?? '' ),
                    'url'   => $url,
                    'desc'  => sanitize_text_field( $link['desc'] ?? '' ),
                ];
            }
            if ( $clean['name'] ) $sections[] = $clean;
        }
        $s['sections'] = $sections;

        return $s;
    }
}