<?php

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

class AdGhost_Page_Exclusions {

    const RULES = [
        'privacy' => true,
        'contact' => true,
        'legal'   => false,
    ];

    const PRIVACY_SLUGS = ['privacy-policy', 'privacy', 'privacy-notice', 'privacy-statement', 'data-protection', 'datenschutz', 'datenschutzerklaerung', 'politica-de-privacidad', 'politique-de-confidentialite', 'informativa-privacy', 'privacybeleid'];
    const PRIVACY_TITLE = '/^(privacy( policy| notice| statement)?|data protection|datenschutz|pol[ií]tica de privacidad|politique de confidentialit[ée])\b/iu';

    const CONTACT_SLUGS = ['contact', 'contact-us', 'contact-me', 'contacts', 'get-in-touch', 'kontakt', 'contacto', 'contatti', 'nous-contacter', 'rabta'];

    const LEGAL_SLUGS = ['terms', 'terms-of-service', 'terms-and-conditions', 'terms-of-use', 'disclaimer', 'legal', 'imprint', 'impressum', 'cookie-policy', 'dmca'];

    public function init() {
        add_action('add_meta_boxes', [$this, 'add_meta_box']);
        add_action('save_post', [$this, 'save_meta_box'], 10, 2);

        add_action('admin_init', function () {
            foreach (self::post_types() as $type) {
                add_filter("manage_{$type}_posts_columns", [$this, 'add_column']);
                add_action("manage_{$type}_posts_custom_column", [$this, 'render_column'], 10, 2);
            }
        });
        add_action('admin_post_adghost_toggle_page_ads', [$this, 'handle_toggle']);
    }

    public static function post_types() {
        $types = get_post_types(['public' => true, 'show_ui' => true]);
        unset($types['attachment']);
        return array_values($types);
    }

    public static function rules() {
        $saved = get_option('adghost_no_ads_pages', null);
        if (!is_array($saved)) {
            return self::RULES;
        }
        $out = [];
        foreach (self::RULES as $key => $default) {
            $out[$key] = !empty($saved[$key]);
        }
        return $out;
    }

    public static function reason() {
        if (!is_singular()) {
            return null;
        }
        $post = get_queried_object();
        if (!$post instanceof WP_Post) {
            return null;
        }

        if (get_post_meta($post->ID, AdGhost_Targeting::DISABLE_META, true)) {
            return 'Ads are switched off for this page';
        }

        $rules = self::rules();
        if ($rules['privacy'] && self::is_privacy_page($post)) {
            return 'This is the privacy policy page (Settings → Pages without ads)';
        }
        if ($post->post_type === 'page') {
            if ($rules['contact'] && self::matches($post, self::CONTACT_SLUGS, '/^(contact|get in touch|kontakt|contacto)\b/i')) {
                return 'This is a contact page (Settings → Pages without ads)';
            }
            if ($rules['legal'] && self::matches($post, self::LEGAL_SLUGS, '/^(terms|disclaimer|legal|imprint|impressum|cookie policy)\b/i')) {
                return 'This is a terms or legal page (Settings → Pages without ads)';
            }
        }
        return null;
    }

    private static function is_privacy_page(WP_Post $post) {
        if ((int) get_option('wp_page_for_privacy_policy') === (int) $post->ID) {
            return true;
        }
        return $post->post_type === 'page' && self::matches($post, self::PRIVACY_SLUGS, self::PRIVACY_TITLE);
    }

    private static function matches(WP_Post $post, array $slugs, $title_pattern) {
        return in_array($post->post_name, $slugs, true) || preg_match($title_pattern, trim((string) $post->post_title));
    }

    public static function affected_pages() {
        $out = [];

        $privacy = (int) get_option('wp_page_for_privacy_policy');
        if ($privacy && get_post_status($privacy) === 'publish') {
            $out[$privacy] = ['id' => $privacy, 'title' => get_the_title($privacy), 'why' => 'privacy', 'edit' => (string) get_edit_post_link($privacy, 'raw')];
        }

        $slugs = array_merge(self::PRIVACY_SLUGS, self::CONTACT_SLUGS, self::LEGAL_SLUGS);
        foreach (get_posts(['post_type' => 'page', 'post_status' => 'publish', 'post_name__in' => $slugs, 'numberposts' => 30]) as $page) {
            $why = in_array($page->post_name, self::PRIVACY_SLUGS, true) ? 'privacy' : (in_array($page->post_name, self::CONTACT_SLUGS, true) ? 'contact' : 'legal');
            $out[$page->ID] = ['id' => $page->ID, 'title' => get_the_title($page), 'why' => $why, 'edit' => (string) get_edit_post_link($page->ID, 'raw')];
        }

        foreach (get_posts(['post_type' => self::post_types(), 'post_status' => 'any', 'meta_key' => AdGhost_Targeting::DISABLE_META, 'meta_value' => '1', 'numberposts' => 50]) as $page) { // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_key, WordPress.DB.SlowDBQuery.slow_db_query_meta_value
            $out[$page->ID] = ['id' => $page->ID, 'title' => get_the_title($page), 'why' => 'manual', 'edit' => (string) get_edit_post_link($page->ID, 'raw')];
        }

        return array_values($out);
    }

    public function add_meta_box() {
        foreach (self::post_types() as $type) {
            add_meta_box('adghost-page-ads', __('AdGhost', 'adghost-lite'), [$this, 'render_meta_box'], $type, 'side', 'high');
        }
    }

    public function render_meta_box($post) {
        wp_nonce_field('adghost_page_ads', 'adghost_page_ads_nonce');
        $off = (bool) get_post_meta($post->ID, AdGhost_Targeting::DISABLE_META, true);
        ?>
        <p>
            <label>
                <input type="checkbox" name="adghost_disable_ads" value="1" <?php checked($off); ?>>
                <strong><?php esc_html_e('Hide ads on this page', 'adghost-lite'); ?></strong>
            </label>
        </p>
        <p class="description"><?php esc_html_e('No ad of any kind is shown here, including the anchor bar and interstitial.', 'adghost-lite'); ?></p>
        <?php
    }

    public function save_meta_box($post_id, $post) {
        if (!isset($_POST['adghost_page_ads_nonce'])
            || !wp_verify_nonce(sanitize_text_field(wp_unslash($_POST['adghost_page_ads_nonce'])), 'adghost_page_ads')
            || (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE)
            || !current_user_can('edit_post', $post_id)) {
            return;
        }
        $was = (bool) get_post_meta($post_id, AdGhost_Targeting::DISABLE_META, true);
        if (!empty($_POST['adghost_disable_ads'])) {
            update_post_meta($post_id, AdGhost_Targeting::DISABLE_META, '1');
        } else {
            delete_post_meta($post_id, AdGhost_Targeting::DISABLE_META);
        }
        if ($was !== !empty($_POST['adghost_disable_ads'])) {
            AdGhost_Helper::purge_page_cache($post_id);
        }
    }

    public function add_column($columns) {
        $columns['adghost_ads'] = __('Ads', 'adghost-lite');
        return $columns;
    }

    public function render_column($column, $post_id) {
        if ($column !== 'adghost_ads' || !current_user_can('edit_post', $post_id)) {
            return;
        }
        $manual = (bool) get_post_meta($post_id, AdGhost_Targeting::DISABLE_META, true);
        $rule   = !$manual ? self::rule_for($post_id) : null;
        $url    = wp_nonce_url(admin_url('admin-post.php?action=adghost_toggle_page_ads&post=' . (int) $post_id), 'adghost_toggle_page_ads_' . (int) $post_id);

        if ($rule !== null) {
            echo '<span style="color:#996800">' . esc_html__('Off', 'adghost-lite') . '</span><br><small>' . esc_html($rule) . '</small>';
            return;
        }
        if ($manual) {
            echo '<span style="color:#b32d2e">' . esc_html__('Off', 'adghost-lite') . '</span><br><a href="' . esc_url($url) . '">' . esc_html__('Turn on', 'adghost-lite') . '</a>';
            return;
        }
        echo '<span style="color:#008a20">' . esc_html__('On', 'adghost-lite') . '</span><br><a href="' . esc_url($url) . '">' . esc_html__('Turn off', 'adghost-lite') . '</a>';
    }

    private static function rule_for($post_id) {
        $post  = get_post($post_id);
        $rules = self::rules();
        if (!$post) {
            return null;
        }
        if ($rules['privacy'] && self::is_privacy_page($post)) {
            return __('Privacy policy page', 'adghost-lite');
        }
        if ($post->post_type === 'page' && $rules['contact'] && self::matches($post, self::CONTACT_SLUGS, '/^(contact|get in touch|kontakt|contacto)\b/i')) {
            return __('Contact page', 'adghost-lite');
        }
        if ($post->post_type === 'page' && $rules['legal'] && self::matches($post, self::LEGAL_SLUGS, '/^(terms|disclaimer|legal|imprint|impressum|cookie policy)\b/i')) {
            return __('Legal page', 'adghost-lite');
        }
        return null;
    }

    public function handle_toggle() {
        $post_id = isset($_GET['post']) ? absint($_GET['post']) : 0;
        check_admin_referer('adghost_toggle_page_ads_' . $post_id);
        if (!$post_id || !current_user_can('edit_post', $post_id)) {
            wp_die(esc_html__('You are not allowed to change ads on this page.', 'adghost-lite'), 403);
        }
        if (get_post_meta($post_id, AdGhost_Targeting::DISABLE_META, true)) {
            delete_post_meta($post_id, AdGhost_Targeting::DISABLE_META);
        } else {
            update_post_meta($post_id, AdGhost_Targeting::DISABLE_META, '1');
        }

        AdGhost_Helper::purge_page_cache($post_id);
        wp_safe_redirect(wp_get_referer() ? wp_get_referer() : admin_url('edit.php?post_type=' . get_post_type($post_id)));
        exit;
    }
}