<?php
/**
 * Advanced Meta Robots Controller
 * Free feature — noindex/nofollow controls per post type and per individual post
 *
 * @package ShadowSync_SEO
 */

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

class ShadowSync_SEO_Meta_Robots {

    public function __construct() {
        add_action( 'admin_menu',                 [ $this, 'add_menu' ] );
        add_action( 'wp_ajax_shadowsync_seo_save_robots_settings', [ $this, 'save_settings' ] );
        add_action( 'wp_head',                    [ $this, 'output_meta_robots' ], 1 );
        add_action( 'add_meta_boxes',              [ $this, 'add_post_meta_box' ] );
        add_action( 'save_post',                   [ $this, 'save_post_meta' ] );
    }

    // ── ADMIN MENU ─────────────────────────────────────────

    public function add_menu() {
        add_submenu_page(
            'shadowsync-seo-dashboard',
            __( 'Search Appearance', 'shadowsync-seo' ),
            __( '🔍 Search Appearance', 'shadowsync-seo' ),
            'manage_options',
            'shadowsync-seo-search-appearance',
            [ $this, 'render_page' ]
        );
    }

    // ── GLOBAL SETTINGS ─────────────────────────────────────

    private function get_post_type_settings() {
        $defaults = [
            'post' => [ 'noindex' => false, 'in_search' => true ],
            'page' => [ 'noindex' => false, 'in_search' => true ],
        ];
        return get_option( 'shadowsync_seo_post_type_settings', $defaults );
    }

    private function get_taxonomy_settings() {
        $defaults = [
            'category' => [ 'noindex' => false, 'in_search' => true ],
            'post_tag' => [ 'noindex' => false, 'in_search' => true ],
        ];
        return get_option( 'shadowsync_seo_taxonomy_settings', $defaults );
    }

    private function get_archive_settings() {
        $defaults = [
            'author_archive_noindex' => false,
            'date_archive_noindex'   => true, // date archives are noindexed by default (best practice)
        ];
        return get_option( 'shadowsync_seo_archive_settings', $defaults );
    }

    // ── OUTPUT META ROBOTS TAG ──────────────────────────────

    public function output_meta_robots() {
        $directives = [];

        if ( is_singular() ) {
            global $post;
            $post_noindex  = get_post_meta( $post->ID, '_shadowsync_seo_noindex', true );
            $post_nofollow = get_post_meta( $post->ID, '_shadowsync_seo_nofollow', true );

            if ( '1' === $post_noindex ) {
                $directives[] = 'noindex';
            } else {
                $type_settings = $this->get_post_type_settings();
                if ( ! empty( $type_settings[ $post->post_type ]['noindex'] ) ) {
                    $directives[] = 'noindex';
                }
            }

            if ( '1' === $post_nofollow ) {
                $directives[] = 'nofollow';
            }

        } elseif ( is_author() ) {
            $archive_settings = $this->get_archive_settings();
            if ( ! empty( $archive_settings['author_archive_noindex'] ) ) {
                $directives[] = 'noindex';
            }

        } elseif ( is_date() ) {
            $archive_settings = $this->get_archive_settings();
            if ( ! empty( $archive_settings['date_archive_noindex'] ) ) {
                $directives[] = 'noindex';
            }

        } elseif ( is_category() || is_tag() ) {
            $term = get_queried_object();
            if ( $term ) {
                $tax_settings = $this->get_taxonomy_settings();
                $taxonomy     = $term->taxonomy;
                if ( ! empty( $tax_settings[ $taxonomy ]['noindex'] ) ) {
                    $directives[] = 'noindex';
                }
            }
        }

        // Advanced robots controls (max-snippet, max-image-preview etc.)
        $advanced = get_option( 'shadowsync_seo_advanced_robots', [
            'max_snippet'       => '-1',
            'max_image_preview' => 'large',
            'max_video_preview' => '-1',
        ] );

        $directives[] = 'max-snippet:' . $advanced['max_snippet'];
        $directives[] = 'max-image-preview:' . $advanced['max_image_preview'];
        $directives[] = 'max-video-preview:' . $advanced['max_video_preview'];

        if ( ! empty( $directives ) ) {
            echo '<meta name="robots" content="' . esc_attr( implode( ', ', $directives ) ) . '">' . "\n";
        }
    }

    // ── PER-POST META BOX ───────────────────────────────────

    public function add_post_meta_box() {
        $post_types = get_post_types( [ 'public' => true ], 'names' );

        foreach ( $post_types as $type ) {
            add_meta_box(
                'shadowsync_seo_robots_meta',
                __( '🔍 Search Visibility', 'shadowsync-seo' ),
                [ $this, 'render_post_meta_box' ],
                $type,
                'side',
                'low'
            );
        }
    }

    public function render_post_meta_box( $post ) {
        wp_nonce_field( 'shadowsync_seo_robots_meta_save', 'shadowsync_seo_robots_meta_nonce' );

        $noindex  = get_post_meta( $post->ID, '_shadowsync_seo_noindex', true );
        $nofollow = get_post_meta( $post->ID, '_shadowsync_seo_nofollow', true );
        ?>
        <p>
            <label>
                <input type="checkbox" name="shadowsync_seo_noindex" value="1" <?php checked( $noindex, '1' ); ?>>
                <?php esc_html_e( 'Hide this from search engines (noindex)', 'shadowsync-seo' ); ?>
            </label>
        </p>
        <p>
            <label>
                <input type="checkbox" name="shadowsync_seo_nofollow" value="1" <?php checked( $nofollow, '1' ); ?>>
                <?php esc_html_e( "Don't follow links on this page (nofollow)", 'shadowsync-seo' ); ?>
            </label>
        </p>
        <p style="font-size:12px; color:#888;">
            <?php esc_html_e( 'Leave unchecked for normal search visibility (recommended for most content).', 'shadowsync-seo' ); ?>
        </p>
        <?php
    }

    public function save_post_meta( $post_id ) {
        if ( ! isset( $_POST['shadowsync_seo_robots_meta_nonce'] ) || ! wp_verify_nonce( sanitize_text_field( wp_unslash( $_POST['shadowsync_seo_robots_meta_nonce'] ) ), 'shadowsync_seo_robots_meta_save' ) ) {
            return;
        }
        if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
            return;
        }
        if ( ! current_user_can( 'edit_post', $post_id ) ) {
            return;
        }

        update_post_meta( $post_id, '_shadowsync_seo_noindex', isset( $_POST['shadowsync_seo_noindex'] ) ? '1' : '' );
        update_post_meta( $post_id, '_shadowsync_seo_nofollow', isset( $_POST['shadowsync_seo_nofollow'] ) ? '1' : '' );
    }

    // ── AJAX SAVE GLOBAL SETTINGS ───────────────────────────

    public function save_settings() {
        check_ajax_referer( 'shadowsync_seo_scan_nonce', 'nonce' );
        ShadowSync_SEO_Security::require_admin();

        // Post type settings
        $post_type_settings = [];
        $raw_types = isset( $_POST['post_types'] ) ? map_deep( (array) wp_unslash( $_POST['post_types'] ), 'sanitize_text_field' ) : [];
        foreach ( $raw_types as $type => $settings ) {
            $type = sanitize_key( $type );
            $post_type_settings[ $type ] = [
                'noindex'   => ! empty( $settings['noindex'] ),
                'in_search' => empty( $settings['noindex'] ), // inverse for clarity in UI
            ];
        }
        update_option( 'shadowsync_seo_post_type_settings', $post_type_settings );

        // Taxonomy settings
        $tax_settings = [];
        $raw_tax = isset( $_POST['taxonomies'] ) ? map_deep( (array) wp_unslash( $_POST['taxonomies'] ), 'sanitize_text_field' ) : [];
        foreach ( $raw_tax as $tax => $settings ) {
            $tax = sanitize_key( $tax );
            $tax_settings[ $tax ] = [
                'noindex' => ! empty( $settings['noindex'] ),
            ];
        }
        update_option( 'shadowsync_seo_taxonomy_settings', $tax_settings );

        // Archive settings
        update_option( 'shadowsync_seo_archive_settings', [
            'author_archive_noindex' => ! empty( $_POST['author_archive_noindex'] ),
            'date_archive_noindex'   => ! empty( $_POST['date_archive_noindex'] ),
        ] );

        // Advanced robots directives
        $max_snippet = isset( $_POST['max_snippet'] ) ? sanitize_text_field( wp_unslash( $_POST['max_snippet'] ) ) : '-1';
        $max_image   = isset( $_POST['max_image_preview'] ) ? sanitize_text_field( wp_unslash( $_POST['max_image_preview'] ) ) : 'large';
        $max_video   = isset( $_POST['max_video_preview'] ) ? sanitize_text_field( wp_unslash( $_POST['max_video_preview'] ) ) : '-1';

        update_option( 'shadowsync_seo_advanced_robots', [
            'max_snippet'       => $max_snippet,
            'max_image_preview' => in_array( $max_image, [ 'none', 'standard', 'large' ], true ) ? $max_image : 'large',
            'max_video_preview' => $max_video,
        ] );

        wp_send_json_success( [
            'message' => __( '✅ Search appearance settings saved.', 'shadowsync-seo' ),
        ] );
    }

    // ── RENDER ADMIN PAGE ───────────────────────────────────

    public function render_page() {
        $post_type_settings = $this->get_post_type_settings();
        $tax_settings       = $this->get_taxonomy_settings();
        $archive_settings   = $this->get_archive_settings();
        $advanced           = get_option( 'shadowsync_seo_advanced_robots', [
            'max_snippet'       => '-1',
            'max_image_preview' => 'large',
            'max_video_preview' => '-1',
        ] );

        $public_post_types = get_post_types( [ 'public' => true ], 'objects' );
        $public_taxonomies = get_taxonomies( [ 'public' => true ], 'objects' );
        ?>
        <div class="wrap" id="shadowsync-seo-wrap">
            <h1>🔍 <?php esc_html_e( 'Search Appearance Settings', 'shadowsync-seo' ); ?></h1>

            <div class="shadowsync-seo-settings-card">
                <h2><?php esc_html_e( 'Content Types', 'shadowsync-seo' ); ?></h2>
                <p><?php esc_html_e( 'Control whether each content type is allowed to appear in search engine results.', 'shadowsync-seo' ); ?></p>

                <table class="widefat" style="margin-top:12px;">
                    <thead>
                        <tr>
                            <th><?php esc_html_e( 'Content Type', 'shadowsync-seo' ); ?></th>
                            <th style="width:220px;"><?php esc_html_e( 'Show in search results?', 'shadowsync-seo' ); ?></th>
                        </tr>
                    </thead>
                    <tbody>
                        <?php foreach ( $public_post_types as $type ) :
                            $noindex = ! empty( $post_type_settings[ $type->name ]['noindex'] );
                        ?>
                        <tr>
                            <td><?php echo esc_html( $type->labels->name ); ?> <code style="font-size:11px; color:#888;"><?php echo esc_html( $type->name ); ?></code></td>
                            <td>
                                <select name="post_types[<?php echo esc_attr( $type->name ); ?>][noindex]" class="shadowsync-seo-post-type-select">
                                    <option value="0" <?php selected( ! $noindex ); ?>><?php esc_html_e( 'Yes — show in search', 'shadowsync-seo' ); ?></option>
                                    <option value="1" <?php selected( $noindex ); ?>><?php esc_html_e( 'No — hide (noindex)', 'shadowsync-seo' ); ?></option>
                                </select>
                            </td>
                        </tr>
                        <?php endforeach; ?>
                    </tbody>
                </table>
            </div>

            <div class="shadowsync-seo-settings-card">
                <h2><?php esc_html_e( 'Taxonomies', 'shadowsync-seo' ); ?></h2>
                <p><?php esc_html_e( 'Control whether category and tag archive pages appear in search results.', 'shadowsync-seo' ); ?></p>

                <table class="widefat" style="margin-top:12px;">
                    <thead>
                        <tr>
                            <th><?php esc_html_e( 'Taxonomy', 'shadowsync-seo' ); ?></th>
                            <th style="width:220px;"><?php esc_html_e( 'Show in search results?', 'shadowsync-seo' ); ?></th>
                        </tr>
                    </thead>
                    <tbody>
                        <?php foreach ( $public_taxonomies as $tax ) :
                            $noindex = ! empty( $tax_settings[ $tax->name ]['noindex'] );
                        ?>
                        <tr>
                            <td><?php echo esc_html( $tax->labels->name ); ?> <code style="font-size:11px; color:#888;"><?php echo esc_html( $tax->name ); ?></code></td>
                            <td>
                                <select name="taxonomies[<?php echo esc_attr( $tax->name ); ?>][noindex]" class="shadowsync-seo-tax-select">
                                    <option value="0" <?php selected( ! $noindex ); ?>><?php esc_html_e( 'Yes — show in search', 'shadowsync-seo' ); ?></option>
                                    <option value="1" <?php selected( $noindex ); ?>><?php esc_html_e( 'No — hide (noindex)', 'shadowsync-seo' ); ?></option>
                                </select>
                            </td>
                        </tr>
                        <?php endforeach; ?>
                    </tbody>
                </table>
            </div>

            <div class="shadowsync-seo-settings-card">
                <h2><?php esc_html_e( 'Archive Pages', 'shadowsync-seo' ); ?></h2>

                <table class="form-table">
                    <tr>
                        <th scope="row"><?php esc_html_e( 'Author archives', 'shadowsync-seo' ); ?></th>
                        <td>
                            <label>
                                <input type="checkbox" id="shadowsync-seo-author-noindex" <?php checked( ! empty( $archive_settings['author_archive_noindex'] ) ); ?>>
                                <?php esc_html_e( 'Hide author archive pages from search engines', 'shadowsync-seo' ); ?>
                            </label>
                            <p class="description"><?php esc_html_e( 'Recommended for single-author sites to avoid duplicate content.', 'shadowsync-seo' ); ?></p>
                        </td>
                    </tr>
                    <tr>
                        <th scope="row"><?php esc_html_e( 'Date archives', 'shadowsync-seo' ); ?></th>
                        <td>
                            <label>
                                <input type="checkbox" id="shadowsync-seo-date-noindex" <?php checked( ! empty( $archive_settings['date_archive_noindex'] ) ); ?>>
                                <?php esc_html_e( 'Hide date-based archive pages from search engines', 'shadowsync-seo' ); ?>
                            </label>
                            <p class="description"><?php esc_html_e( 'Recommended — date archives are usually thin, duplicate content.', 'shadowsync-seo' ); ?></p>
                        </td>
                    </tr>
                </table>
            </div>

            <div class="shadowsync-seo-settings-card">
                <h2><?php esc_html_e( 'Advanced Robots Directives', 'shadowsync-seo' ); ?></h2>
                <p><?php esc_html_e( 'Control how much of your content Google is allowed to show in search snippets.', 'shadowsync-seo' ); ?></p>

                <table class="form-table">
                    <tr>
                        <th scope="row"><?php esc_html_e( 'Max snippet length', 'shadowsync-seo' ); ?></th>
                        <td>
                            <select id="shadowsync-seo-max-snippet">
                                <option value="-1" <?php selected( $advanced['max_snippet'], '-1' ); ?>><?php esc_html_e( 'No limit (recommended)', 'shadowsync-seo' ); ?></option>
                                <option value="0" <?php selected( $advanced['max_snippet'], '0' ); ?>><?php esc_html_e( 'No snippet', 'shadowsync-seo' ); ?></option>
                                <option value="50" <?php selected( $advanced['max_snippet'], '50' ); ?>><?php esc_html_e( '50 characters', 'shadowsync-seo' ); ?></option>
                                <option value="160" <?php selected( $advanced['max_snippet'], '160' ); ?>><?php esc_html_e( '160 characters', 'shadowsync-seo' ); ?></option>
                            </select>
                        </td>
                    </tr>
                    <tr>
                        <th scope="row"><?php esc_html_e( 'Max image preview size', 'shadowsync-seo' ); ?></th>
                        <td>
                            <select id="shadowsync-seo-max-image">
                                <option value="large" <?php selected( $advanced['max_image_preview'], 'large' ); ?>><?php esc_html_e( 'Large (recommended)', 'shadowsync-seo' ); ?></option>
                                <option value="standard" <?php selected( $advanced['max_image_preview'], 'standard' ); ?>><?php esc_html_e( 'Standard', 'shadowsync-seo' ); ?></option>
                                <option value="none" <?php selected( $advanced['max_image_preview'], 'none' ); ?>><?php esc_html_e( 'None', 'shadowsync-seo' ); ?></option>
                            </select>
                        </td>
                    </tr>
                    <tr>
                        <th scope="row"><?php esc_html_e( 'Max video preview length', 'shadowsync-seo' ); ?></th>
                        <td>
                            <select id="shadowsync-seo-max-video">
                                <option value="-1" <?php selected( $advanced['max_video_preview'], '-1' ); ?>><?php esc_html_e( 'No limit (recommended)', 'shadowsync-seo' ); ?></option>
                                <option value="0" <?php selected( $advanced['max_video_preview'], '0' ); ?>><?php esc_html_e( 'No video preview', 'shadowsync-seo' ); ?></option>
                            </select>
                        </td>
                    </tr>
                </table>

                <button id="shadowsync-seo-save-search-appearance" class="button button-primary">
                    💾 <?php esc_html_e( 'Save All Settings', 'shadowsync-seo' ); ?>
                </button>

                <div id="shadowsync-seo-search-appearance-result" style="margin-top:10px; font-size:13px;"></div>
            </div>
        </div>

        <?php
    }
}