<?php
declare(strict_types=1);

namespace Gatecraft;

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

/*
 * The Gatecraft section of the admin: About, Release notes, and (from the license module of each edition) the
 * license. These pages are for every staff member, not only admins.
 *
 * License modules report their state through the gatecraft_license_summary filter:
 *   ['state' => none|active|expiring|expired|invalid|wrong_domain|legacy, 'expires' => Y-m-d, 'days_left' => int,
 *    'serial' => string, 'url' => admin path of the license screen, 'label' => edition or product name]
 */

/** Who to contact about licenses and support. Set by the release build; empty means "the seller of your license". */
defined('GATECRAFT_SUPPORT_EMAIL') || define('GATECRAFT_SUPPORT_EMAIL', '');
defined('GATECRAFT_RENEW_URL') || define('GATECRAFT_RENEW_URL', '');
defined('GATECRAFT_DOCS_URL') || define('GATECRAFT_DOCS_URL', '');
defined('GATECRAFT_SECURITY_EMAIL') || define('GATECRAFT_SECURITY_EMAIL', '');

add_filter('gatecraft_admin_routes', fn(array $r) => array_merge($r, [
    ['GET', '/admin/about', 'a_about', 'checkin'],
]));
add_filter('gatecraft_admin_pages', fn(array $p) => $p + [
    'gatecraft-about' => ['About Gatecraft', 'gatecraft_checkin', '/about'],
]);
add_filter('gatecraft_setting_defaults', fn(array $d) => $d + ['license_reminder' => '', 'alert_license_app' => '1', 'alert_license_email' => '1']);
add_filter('gatecraft_alert_types', fn(array $t) => license_summary() ? $t + ['license' => 'License ending or ended'] : $t);

/* Reminders before the license year ends: about 30 days before, 7 days before, and on the day it ends. Each is sent once per license. */
add_filter('gatecraft_worker_jobs', function (array $r) {
    $l = license_summary();
    if (!$l || $l['serial'] === '') return $r;
    $stage = match (true) { $l['state'] === 'expired' => 'ended', $l['state'] === 'expiring' && $l['days_left'] <= 7 => '7', $l['state'] === 'expiring' => '30', default => '' };
    $mark = $l['serial'] . '|' . $l['expires'] . '|' . $stage;
    if ($stage === '' || setting('license_reminder') === $mark) return $r;
    // An installation that only notices after the end (worker off for weeks) sends the ended notice, not a late "ending soon" one.
    if ($stage === 'ended') notify_staff('license', 'Your Gatecraft license has ended', 'Gatecraft keeps working as it is. Renew to get updates and email support again.', $l['url']);
    else notify_staff('license', 'Your Gatecraft license ends on ' . fmt_date($l['expires']), plural(max(0, $l['days_left']), 'day') . ' of updates and email support left. Renew to continue without a gap.', $l['url']);
    setting_save(['license_reminder' => $mark]);
    $r['license_reminder'] = $stage;
    return $r;
});

function is_business_edition(): bool
{
    return defined('GATECRAFT_EDITION_NAME');
}

/** Release notes are listed in the admin by the Business Edition only. The other editions publish them on the website. */
function release_notes_on(): bool
{
    return is_business_edition();
}

/** Release notes for this edition; the Business Edition supplies them (see its infopages overlay). */
function release_notes(): array
{
    return [];
}

/** The license as the license module reports it, or null in an edition without one. */
function license_summary(): ?array
{
    $s = apply_filters('gatecraft_license_summary', null);
    return is_array($s) ? $s : null;
}

/** A license module's own status, in the shape of license_summary(). Active with 30 days or fewer left is "expiring". */
function license_summary_from(array $s, string $url, string $label): array
{
    $state = (string)($s['state'] ?? 'none');
    $days = (int)($s['days_left'] ?? 0);
    if ($state === 'active' && $days <= 30) $state = 'expiring';
    return ['state' => $state, 'expires' => (string)($s['expires'] ?? ''), 'days_left' => $days, 'serial' => (string)($s['serial'] ?? ''),
        'domain' => (string)($s['domain'] ?? ''), 'here' => (string)($s['here'] ?? ($s['domain'] ?? '')), 'client' => (string)($s['client'] ?? ''),
        'issued' => (string)($s['issued'] ?? ''), 'url' => $url, 'label' => $label];
}

/** Where the license year stands: its first day, and how much of it has passed (exact and rounded to 5 for the bar). */
function license_year(array $l): ?array
{
    if (!preg_match('/^\d{4}-\d{2}-\d{2}$/', $l['expires'] ?? '')) return null;
    $end = (int)strtotime($l['expires'] . ' 23:59:59 UTC');
    $start = preg_match('/^\d{4}-\d{2}-\d{2}/', $l['issued'] ?? '') ? (int)strtotime(substr($l['issued'], 0, 10) . ' 00:00:00 UTC') : 0;
    if ($start <= 0 || $start >= $end) $start = (int)strtotime(gmdate('Y-m-d', $end) . ' 00:00:00 UTC -1 year +1 day');
    $pct = max(0, min(100, (int)round((time() - $start) / max(1, $end - $start) * 100)));
    return ['start' => gmdate('Y-m-d', $start), 'pct' => $pct, 'step' => (int)(round($pct / 5) * 5)];
}

/** Words for the license state, for headers and banners. */
function license_state_text(array $s): array
{
    return match ($s['state']) {
        'active' => ['green', 'Updates and support until ' . fmt_date($s['expires'])],
        'expiring' => ['amber', plural(max(0, (int)$s['days_left']), 'day') . ' of updates and support left'],
        'expired' => ['red', 'Updates and support ended on ' . fmt_date($s['expires'])],
        'none' => ['grey', 'No license yet'],
        'legacy' => ['red', 'Older license key, not accepted'],
        default => ['red', 'License needs attention'],
    };
}

function a_about(): void
{
    render('admin/about_wp', ['title' => 'About Gatecraft', 'nav' => 'about', 'lic' => license_summary(), 'latest' => release_notes()[0] ?? null]);
}

/* Dashboard: what's new after an update, and the license when it needs attention. */
add_action('gatecraft_slot_dashboard_top', function () {
    if (!can('settings')) return;
    $latest = release_notes()[0] ?? null;
    $seen = '';
    if ($latest) {
        $seen = setting('release_notes_seen');
        if ($seen === '') { setting_save(['release_notes_seen' => GATECRAFT_VERSION]); $seen = GATECRAFT_VERSION; } // a fresh install has nothing new to announce
    }
    $lic = license_summary();
    $vars = ['showNew' => $latest && $seen !== '' && version_compare($seen, GATECRAFT_VERSION, '<'), 'latest' => $latest,
        'lic' => $lic && !is_business_edition() && in_array($lic['state'], ['expiring', 'expired', 'invalid', 'wrong_domain'], true) ? $lic : null];
    include_template('admin/partials/dashboard_notices', $vars);
});