<?php
/* DT-cache – inställningssidan (Datoden → DT-cache), kontrollen, och flytten från WP Fastest Cache. */
if (!defined('ABSPATH')) exit;

const DATODEN_CACHE_WPFC = 'wp-fastest-cache/wpFastestCache.php';

add_action('admin_menu', static function () {
    add_submenu_page('datoden', __('DT-cache', 'datoden-page-cache'), __('DT-cache', 'datoden-page-cache'), 'manage_options', 'datoden-page-cache', 'datoden_cache_page');
});
add_action('admin_init', static function () {
    register_setting('datoden_cache', 'datoden_cache_options', ['type' => 'array', 'sanitize_callback' => 'datoden_cache_sanitize', 'default' => datoden_cache_defaults()]);
});
function datoden_cache_sanitize($in): array {
    $in = is_array($in) ? $in : [];
    $old = datoden_cache_options();
    $o = $old;
    /* $o innehåller allt som redan är sparat – bara sidans egna värden ändras, resten ligger kvar orört */
    $o['enabled'] = empty($in['enabled']) ? 0 : 1;
    $o['shop'] = empty($in['shop']) ? 0 : 1;
    $o['lifetime'] = in_array((int) ($in['lifetime'] ?? 24), [0, 1, 3, 6, 12, 24, 48, 72, 168], true) ? (int) $in['lifetime'] : 24;
    $lines = array_filter(array_map('trim', preg_split('/\R/', (string) ($in['exclude'] ?? ''))));
    $o['exclude'] = implode("\n", array_map('sanitize_text_field', $lines));
    /* det som ändrar sidornas innehåll eller vem som får vilken fil → cachen töms */
    foreach (['enabled', 'exclude'] as $k) {
        if ($o[$k] != $old[$k]) { add_action('shutdown', static function () { datoden_cache_purge_all(); }, 0); break; }
    }
    foreach ($in as $k => $v) if (substr((string) $k, -9) === '_imported') $o[$k] = empty($v) ? 0 : 1; // flyttflaggan behålls när flytten sparar
    return $o;
}

add_action('admin_enqueue_scripts', static function ($hook) {
    wp_register_style('datoden-cache-bar', false, [], DATODEN_CACHE_VERSION);
    wp_enqueue_style('datoden-cache-bar');
    wp_add_inline_style('datoden-cache-bar', '#wpadminbar #wp-admin-bar-datoden-cache .ab-icon:before{content:"\f226";top:2px}');
    if (substr((string) $hook, -strlen('_page_datoden-page-cache')) !== '_page_datoden-page-cache') return;
    wp_enqueue_style('datoden-cache-admin', datoden_core_url('dt-admin.css'), [], datoden_core_ver());
    wp_enqueue_style('datoden-cache', plugins_url('assets/dt-cache.css', DATODEN_CACHE_FILE), [], DATODEN_CACHE_VERSION);
    wp_enqueue_script('datoden-cache', plugins_url('assets/dt-cache.js', DATODEN_CACHE_FILE), [], DATODEN_CACHE_VERSION, true);
    wp_localize_script('datoden-cache', 'datodenCache', [
        'ajax'  => admin_url('admin-ajax.php'),
        'nonce' => wp_create_nonce('datoden_cache'),
        'i18n'  => [
            'checking' => __('Checking…', 'datoden-page-cache'),
            'server'   => __('Fastest: the page comes straight from the server, without WordPress.', 'datoden-page-cache'),
            'php'      => __('Fast: the page comes from the cache via the plugin. The server does not use the .htaccess rules (for example Nginx), so WordPress starts briefly.', 'datoden-page-cache'),
            /* translators: %s: the reason the page did not come from the cache */
            'miss'     => __('The page did not come from the cache. %s', 'datoden-page-cache'),
            'failed'   => __('The website could not be reached from the server. Try again.', 'datoden-page-cache'),
            'wpfcAsk'  => __('Take over the settings from WP Fastest Cache and turn it off? Its cache and .htaccess rules are removed.', 'datoden-page-cache'),
            'emptied'  => __('The cache is empty.', 'datoden-page-cache'),
        ],
    ]);
    wp_enqueue_script('datoden-autosave', datoden_core_url('dt-autosave.js'), [], datoden_core_ver(), true);
});

/* ---------- kontrollen: kommer startsidan från cachen? ---------- */
function datoden_cache_ajax_guard(): void {
    check_ajax_referer('datoden_cache', 'nonce');
    if (!current_user_can('manage_options')) wp_send_json_error([], 403);
}
add_action('wp_ajax_datoden_cache_check', static function () {
    datoden_cache_ajax_guard();
    if (!datoden_cache_on()) wp_send_json_success(['state' => 'off', 'why' => __('The cache is turned off.', 'datoden-page-cache')]);
    $url = add_query_arg([], home_url('/'));
    $args = ['timeout' => 20, 'redirection' => 0, 'sslverify' => false, 'user-agent' => 'Mozilla/5.0 (DT-cache Check)', 'cookies' => []];
    $r = null;
    for ($i = 0; $i < 2; $i++) { $r = wp_remote_get($url, $args); if (is_wp_error($r)) break; } // första gången sparas sidan, andra gången ska den komma från cachen
    if (is_wp_error($r)) wp_send_json_success(['state' => 'failed']);
    $hit = (string) wp_remote_retrieve_header($r, 'x-dt-cache');
    $code = (int) wp_remote_retrieve_response_code($r);
    if (stripos($hit, 'server') !== false) wp_send_json_success(['state' => 'server']);
    if (stripos($hit, 'php') !== false) wp_send_json_success(['state' => 'php']);
    $body = (string) wp_remote_retrieve_body($r);
    if ($code >= 300 && $code < 400) $why = sprintf(/* translators: %s: address */ __('The front page redirects to %s.', 'datoden-page-cache'), (string) wp_remote_retrieve_header($r, 'location'));
    elseif ($code !== 200) $why = sprintf(/* translators: %d: HTTP status */ __('The front page answered with status %d.', 'datoden-page-cache'), $code);
    elseif (strpos($body, 'DT-cache:') !== false) $why = __('The page is saved, but another cache or the server sent it. Empty that cache too.', 'datoden-page-cache');
    else $why = __('Something on the page stops it from being saved – for example a plugin that sets a cookie or marks the page as not cacheable (DONOTCACHEPAGE).', 'datoden-page-cache');
    wp_send_json_success(['state' => 'miss', 'why' => $why]);
});
add_action('wp_ajax_datoden_cache_empty', static function () {
    datoden_cache_ajax_guard();
    datoden_cache_purge_all();
    wp_send_json_success(datoden_cache_stats_view());
});
add_action('wp_ajax_datoden_cache_stats', static function () {
    datoden_cache_ajax_guard();
    wp_send_json_success(datoden_cache_stats_view());
});
function datoden_cache_stats_view(): array {
    $s = datoden_cache_stats();
    $hosts = [];
    foreach ($s['hosts'] as $h => $n) $hosts[] = $h . ': ' . $n;
    return [
        /* translators: 1: number of pages, 2: size */
        'line'   => sprintf(_n('%1$s page in the cache (%2$s).', '%1$s pages in the cache (%2$s).', $s['pages'], 'datoden-page-cache'), number_format_i18n($s['pages']), size_format($s['bytes'], 1) ?: '0 B'),
        'hosts'  => implode(' · ', $hosts),
        /* translators: %s: time ago */
        'purged' => $s['purged'] ? sprintf(__('Last emptied %s ago.', 'datoden-page-cache'), human_time_diff($s['purged'])) : '',
    ];
}

/* ---------- flytt från WP Fastest Cache ---------- */
function datoden_cache_wpfc_settings(): array {
    $s = json_decode((string) get_option('WpFastestCache', ''), true);
    return is_array($s) ? $s : [];
}
add_action('admin_post_datoden_cache_wpfc', static function () {
    if (!current_user_can('manage_options') || !current_user_can('activate_plugins')) wp_die('', 403);
    check_admin_referer('datoden_cache_wpfc');
    $s = datoden_cache_wpfc_settings();
    $on = static function ($k) use ($s) { return !empty($s[$k]) && $s[$k] !== 'off'; };
    $o = datoden_cache_options();
    if ($s) {
        $o['enabled'] = $on('wpFastestCacheStatus') ? 1 : 0;
    }
    /* undantagen (sidor) */
    $ex = json_decode((string) get_option('WpFastestCacheExclude', ''), true);
    $lines = array_filter(array_map('trim', preg_split('/\R/', (string) $o['exclude'])));
    foreach (is_array($ex) ? $ex : [] as $r) {
        if (($r['type'] ?? 'page') !== 'page' || empty($r['content'])) continue;
        $c = '/' . trim((string) $r['content'], '/') . '/';
        $line = ($r['prefix'] ?? '') === 'contain' ? '*' . trim((string) $r['content'], '/') . '*' : (($r['prefix'] ?? '') === 'startwith' ? $c . '*' : $c);
        if (!in_array($line, $lines, true)) $lines[] = $line;
    }
    $o['exclude'] = implode("\n", $lines);
    $o['wpfc_imported'] = 1;
    update_option('datoden_cache_options', $o);
    $GLOBALS['datoden_cache_reload'] = true;
    if (!function_exists('deactivate_plugins')) require_once ABSPATH . 'wp-admin/includes/plugin.php';
    if (is_plugin_active(DATODEN_CACHE_WPFC)) deactivate_plugins(DATODEN_CACHE_WPFC); // WP Fastest Cache tar själv bort sin cache och sina regler
    datoden_cache_rmdir(WP_CONTENT_DIR . '/cache/all');
    datoden_cache_htaccess_write();
    datoden_cache_purge_all();
    wp_safe_redirect(admin_url('admin.php?page=datoden-page-cache&dtc=moved')); exit;
});

/* ---------- sidan ---------- */
function datoden_cache_page(): void {
    if (!current_user_can('manage_options')) return;
    $o = datoden_cache_options();
    if (!function_exists('is_plugin_active')) require_once ABSPATH . 'wp-admin/includes/plugin.php';
    $wpfc_on = is_plugin_active(DATODEN_CACHE_WPFC);
    $wpfc_left = !$wpfc_on && datoden_cache_wpfc_settings() && empty($o['wpfc_imported']);
    $ht = datoden_cache_htaccess_path();
    $ht_ok = file_exists($ht) ? wp_is_writable($ht) : wp_is_writable(dirname($ht));
    $srv = datoden_cache_server();
    $stats = datoden_cache_stats_view();
    $lifetimes = [1 => __('1 hour', 'datoden-page-cache'), 3 => __('3 hours', 'datoden-page-cache'), 6 => __('6 hours', 'datoden-page-cache'), 12 => __('12 hours', 'datoden-page-cache'), 24 => __('24 hours (standard)', 'datoden-page-cache'), 48 => __('2 days', 'datoden-page-cache'), 72 => __('3 days', 'datoden-page-cache'), 168 => __('1 week', 'datoden-page-cache'), 0 => __('Until something changes', 'datoden-page-cache')];
    $sw = static function (string $key, string $title, string $text, bool $first = false) use ($o) { ?>
        <div class="dtdm-row dtc-row<?php echo $first ? ' is-first' : ''; ?>">
          <div><h3><?php echo esc_html($title); ?></h3><p><?php echo esc_html($text); ?></p></div>
          <label class="dtdm-switch"><input type="hidden" name="datoden_cache_options[<?php echo esc_attr($key); ?>]" value="0"><input type="checkbox" name="datoden_cache_options[<?php echo esc_attr($key); ?>]" value="1" <?php checked(!empty($o[$key])); ?>><span></span><span class="screen-reader-text"><?php echo esc_html($title); ?></span></label>
        </div>
    <?php };
    ?>
    <div class="wrap dtdm dtc" style="--dtdm-accent:#3953a4">
      <?php /* sidhuvudet kommer från DT-core – tillägget ger namn, version, beskrivning */ datoden_core_head(['name' => __('DT-cache', 'datoden-page-cache'), 'pro' =>  false, 'version' => DATODEN_CACHE_VERSION, 'desc' => __('Finished pages, served straight away – the website feels instant.', 'datoden-page-cache')]); ?>
      <?php settings_errors(); ?>
      <?php if ((isset($_GET['dtc']) ? sanitize_text_field(wp_unslash($_GET['dtc'])) : '') === 'moved') : // phpcs:ignore WordPress.Security.NonceVerification.Recommended -- väljer bara vilket meddelande som visas ?>
        <div class="notice notice-success is-dismissible"><p><?php esc_html_e('The settings from WP Fastest Cache are taken over and it is turned off. WP Fastest Cache can be deleted under Plugins.', 'datoden-page-cache'); ?></p></div>
      <?php endif; ?>
      <?php if ($wpfc_on) : ?>
        <div class="notice notice-warning"><p><?php esc_html_e('WP Fastest Cache is on. DT-cache waits until it is turned off – two page caches at the same time give visitors the wrong pages.', 'datoden-page-cache'); ?></p></div>
      <?php endif; ?>
      <form method="post" action="options.php" class="dtdm-grid" data-dt-autosave>
        <?php settings_fields('datoden_cache'); ?>
        <div class="dtdm-col">
          <?php if (function_exists('datoden_hub_offer_card')) datoden_hub_offer_card(); ?>
          <section class="dtdm-card">
            <h2><?php esc_html_e('Page cache', 'datoden-page-cache'); ?></h2>
            <?php $sw('enabled', __('Save the pages', 'datoden-page-cache'), __('Every page is saved as a finished file the first time it is visited. The next visitor gets the file straight away. Logged-in users always see the live website.', 'datoden-page-cache'), true); ?>
            <div class="dtc-field">
              <label for="dtc-life"><?php esc_html_e('A page is kept for', 'datoden-page-cache'); ?></label>
              <select id="dtc-life" name="datoden_cache_options[lifetime]">
                <?php foreach ($lifetimes as $h => $t) : ?><option value="<?php echo (int) $h; ?>" <?php selected((int) $o['lifetime'], $h); ?>><?php echo esc_html($t); ?></option><?php endforeach; ?>
              </select>
              <p><?php esc_html_e('The cache is also emptied by itself when something changes – a page, a post, a menu, widgets, the Customizer, the theme or a plugin.', 'datoden-page-cache'); ?></p>
            </div>
            <?php $sw('shop', __('Shop mode (WooCommerce)', 'datoden-page-cache'), __('When a product changes – price, stock or text – only its own pages are emptied: the product, its categories, the shop page and the front page, on every language. Pages are kept at most 12 hours.', 'datoden-page-cache')); ?>
            <?php if (!class_exists('WooCommerce')) : ?><p class="dtc-note"><?php esc_html_e('WooCommerce is not active – shop mode does nothing until it is.', 'datoden-page-cache'); ?></p><?php endif; ?>
            <div class="dtc-field dtc-ex">
              <label for="dtc-ex"><?php esc_html_e('Never save these pages', 'datoden-page-cache'); ?></label>
              <textarea id="dtc-ex" name="datoden_cache_options[exclude]" rows="3" class="widefat code" placeholder="/kassa/&#10;/medlemmar/*&#10;*kalender*"><?php echo esc_textarea($o['exclude']); ?></textarea>
              <p><?php esc_html_e('One address per line. /page/ = just that page, /page/* = everything that starts with it, *word* = every address that contains the word. Search, 404, password-protected pages and the shop cart/checkout are never saved.', 'datoden-page-cache'); ?></p>
            </div>
          </section>
        </div>
        <aside class="dtdm-col" data-dt-autosave-ignore>
          <?php if ($wpfc_on || $wpfc_left) : ?>
          <section class="dtdm-card dtc-move">
            <h2><?php esc_html_e('Move from WP Fastest Cache', 'datoden-page-cache'); ?></h2>
            <p><?php echo $wpfc_on ? esc_html__('One click takes over the settings and the excluded pages, turns WP Fastest Cache off and removes its cache and .htaccess rules. Then DT-cache starts.', 'datoden-page-cache') : esc_html__('Settings from WP Fastest Cache are left on the website. One click takes them over.', 'datoden-page-cache'); ?></p>
            <p><a class="dtdm-btn dtdm-btn--primary" data-dtc-confirm="wpfcAsk" href="<?php echo esc_url(wp_nonce_url(admin_url('admin-post.php?action=datoden_cache_wpfc'), 'datoden_cache_wpfc')); ?>"><?php echo $wpfc_on ? esc_html__('Take over and turn WP Fastest Cache off', 'datoden-page-cache') : esc_html__('Take over the settings', 'datoden-page-cache'); ?></a></p>
          </section>
          <?php endif; ?>
          <section class="dtdm-card dtc-status">
            <h2><?php esc_html_e('The cache now', 'datoden-page-cache'); ?></h2>
            <p class="dtc-stats"><strong data-k="line"><?php echo esc_html($stats['line']); ?></strong><span data-k="hosts"><?php echo esc_html($stats['hosts']); ?></span><span data-k="purged"><?php echo esc_html($stats['purged']); ?></span></p>
            <p class="dtc-btns"><button type="button" class="dtdm-btn dtdm-btn--primary dtc-empty"><?php esc_html_e('Empty the cache', 'datoden-page-cache'); ?></button>
              <button type="button" class="dtdm-btn dtc-check"><?php esc_html_e('Check the front page', 'datoden-page-cache'); ?></button></p>
            <p class="dtc-result" aria-live="polite"></p>
          </section>
          <section class="dtdm-card">
            <h2><?php esc_html_e('Server', 'datoden-page-cache'); ?></h2>
            <ul class="dtc-tips">
              <li><?php echo esc_html(in_array($srv, ['apache', 'litespeed'], true) ? __('The server reads .htaccess, so the saved pages are sent without starting WordPress at all.', 'datoden-page-cache') : __('If the server does not read .htaccess (for example Nginx), the plugin sends the saved pages itself – almost as fast.', 'datoden-page-cache')); ?></li>
              <?php if (!$ht_ok) : ?><li class="dtc-warn"><?php esc_html_e('.htaccess cannot be written. The pages are still cached and sent by the plugin.', 'datoden-page-cache'); ?></li><?php endif; ?>
              <li><?php esc_html_e('Other DT plugins empty the cache by themselves when they change something on the pages.', 'datoden-page-cache'); ?></li>
              <li><?php esc_html_e('Empty the cache from the admin bar: Cache → Empty all cache, or Empty this page while you look at it.', 'datoden-page-cache'); ?></li>
            </ul>
            <?php datoden_core_brand(); ?>
          </section>
          <?php datoden_core_pro_card(['name' => 'DT-cache', 'slug' => 'dt-cache', 'items' => [
              __('Fills the cache in the background after it is emptied', 'datoden-page-cache'),
              __('A separate cache for every domain and language', 'datoden-page-cache'),
              __('A separate cache for mobiles', 'datoden-page-cache'),
              __('Smaller HTML, CSS and JavaScript', 'datoden-page-cache'),
              __('Gzip, browser cache for images and files, and no emoji script', 'datoden-page-cache'),
          ]]); ?>
        </aside>
      </form>
    </div>
    <?php
}

add_filter('plugin_action_links_' . plugin_basename(DATODEN_CACHE_FILE), static function ($links) {
    array_unshift($links, '<a href="' . esc_url(admin_url('admin.php?page=datoden-page-cache')) . '">' . esc_html__('Settings', 'datoden-page-cache') . '</a>');
    return $links;
});