<?php

declare(strict_types=1);

namespace ProCalendarWP\Admin;

use ProCalendarWP\Contracts\Module;
use ProCalendarWP\Maps\MapSettings;

final class SettingsPage implements Module
{
    public function register(): void
    {
        add_action('admin_menu', [$this, 'menu']);
        add_action('admin_init', [$this, 'settings']);
        add_action('admin_init', [$this, 'checkAccess'], 5);
        add_action('admin_init', [$this, 'redirectLegacy'], 20);
        add_action('admin_enqueue_scripts', [$this, 'assets']);
        add_action('admin_menu', [$this, 'hideLegacyMenus'], PHP_INT_MAX);
        add_filter('option_page_capability_pcwp_settings', static fn (): string => 'manage_pcwp_events');
        add_filter('parent_file', [$this, 'parentMenu']);
        add_filter('submenu_file', [$this, 'selectedMenu']);
    }

    public function menu(): void
    {
        add_submenu_page('edit.php?post_type=pcwp_event', __('ProEventsWP settings', 'proeventswp'), __('Settings', 'proeventswp'), 'manage_pcwp_events', 'pcwp-settings', [$this, 'render']);
        // Keep the old Pro URL registered in Free too, before WordPress checks page access.
        add_options_page(__('ProEventsWP AI', 'proeventswp'), __('ProEventsWP AI', 'proeventswp'), 'manage_options', 'pcwp-ai-settings', [$this, 'redirectLegacy']);
    }

    public static function url(string $tab = 'calendar'): string
    {
        return add_query_arg(['page' => 'pcwp-settings', 'tab' => self::validTab($tab)], admin_url('edit.php?post_type=pcwp_event'));
    }

    public static function validTab(string $tab): string
    {
        return in_array($tab, ['calendar', 'maps', 'license-ai'], true) ? $tab : 'calendar';
    }

    private function tab(): string
    {
        $tab = $_GET['tab'] ?? 'calendar';
        return self::validTab(is_string($tab) ? sanitize_key($tab) : 'calendar');
    }

    /** @param array<string,mixed> $request */
    public static function legacyTab(array $request, string $method): ?string
    {
        // SDK actions, nonces and connection redirects must retain their original route.
        if ($method !== 'GET' || array_diff(array_keys($request), ['page', 'post_type', 'settings-updated']) !== []) {
            return null;
        }
        return match ($request['page'] ?? '') {
            'pcwp-maps' => 'maps',
            'pcwp-connection', 'pcwp-ai-settings' => 'license-ai',
            default => null,
        };
    }

    public function redirectLegacy(): void
    {
        $tab = self::legacyTab($_GET, (string) ($_SERVER['REQUEST_METHOD'] ?? 'GET'));
        if ($tab === null) {
            return;
        }
        $this->requireAccess($tab);
        $url = self::url($tab);
        if (isset($_GET['settings-updated'])) {
            $url = add_query_arg('settings-updated', 'true', $url);
        }
        wp_safe_redirect($url);
        exit;
    }

    public function hideLegacyMenus(): void
    {
        global $submenu;
        $parent = 'edit.php?post_type=pcwp_event';
        foreach ($submenu[$parent] ?? [] as $item) {
            $slug = (string) $item[2];
            if ($slug === 'pcwp-maps' || $slug === 'pcwp-connection' || str_starts_with($slug, 'pcwp-connection-')) {
                remove_submenu_page($parent, $slug);
            }
        }
        remove_submenu_page('options-general.php', 'pcwp-ai-settings');
    }

    public function parentMenu(string $parent): string
    {
        return $this->isSettingsRoute() ? 'edit.php?post_type=pcwp_event' : $parent;
    }

    public function selectedMenu(?string $selected): ?string
    {
        return $this->isSettingsRoute() ? 'pcwp-settings' : $selected;
    }

    private function isSettingsRoute(): bool
    {
        $page = $_GET['page'] ?? '';
        return is_string($page) && ($page === 'pcwp-settings' || $page === 'pcwp-maps' || $page === 'pcwp-connection' || str_starts_with($page, 'pcwp-connection-'));
    }

    public function assets(): void
    {
        if ($this->isSettingsRoute()) {
            wp_enqueue_style('pcwp-settings', PCWP_URL . 'assets/settings.css', [], PCWP_VERSION);
        }
    }

    private function requireAccess(string $tab): void
    {
        if (! current_user_can($tab === 'license-ai' ? 'manage_options' : 'manage_pcwp_events')) {
            wp_die(esc_html__('You do not have permission to access these settings.', 'proeventswp'), '', ['response' => 403]);
        }
    }

    public function checkAccess(): void
    {
        if (($_GET['page'] ?? '') === 'pcwp-settings') {
            $this->requireAccess($this->tab());
        }
    }

    public function settings(): void
    {
        foreach (['pcwp_event_slug' => 'events', 'pcwp_venue_slug' => 'venues', 'pcwp_organizer_slug' => 'organizers', 'pcwp_series_slug' => 'event-series'] as $option => $default) {
            register_setting('pcwp_settings', $option, [
                'type' => 'string',
                'default' => $default,
                'sanitize_callback' => static function (mixed $value) use ($default): string {
                    $slug = sanitize_title((string) $value);
                    return $slug !== '' ? $slug : $default;
                },
            ]);
        }
        register_setting('pcwp_settings', 'pcwp_default_view', [
            'type' => 'string',
            'default' => 'list',
            'sanitize_callback' => static fn (mixed $value): string => in_array($value, ['list', 'photo', 'month', 'day', 'week', 'map'], true) ? (string) $value : 'list',
        ]);
        add_settings_section('pcwp_urls', __('Public calendar', 'proeventswp'), static function (): void {
            echo '<p>' . esc_html__('Changing a slug requires saving WordPress permalinks before cutover.', 'proeventswp') . '</p>';
        }, 'pcwp-settings');
        $this->textField('pcwp_event_slug', __('Event archive slug', 'proeventswp'));
        $this->textField('pcwp_venue_slug', __('Venue archive slug', 'proeventswp'));
        $this->textField('pcwp_organizer_slug', __('Organizer archive slug', 'proeventswp'));
        $this->textField('pcwp_series_slug', __('Series archive slug', 'proeventswp'));
        add_settings_field('pcwp_default_view', __('Default view', 'proeventswp'), [$this, 'viewField'], 'pcwp-settings', 'pcwp_urls', ['label_for' => 'pcwp_default_view']);
    }

    public function render(): void
    {
        $tab = $this->tab();
        $this->requireAccess($tab);
        $tabs = ['calendar' => __('Calendar', 'proeventswp'), 'maps' => __('Maps', 'proeventswp')];
        if (current_user_can('manage_options')) {
            $tabs['license-ai'] = __('License & AI', 'proeventswp');
        }
        ?>
        <div class="wrap pcwp-settings"><h1><?php esc_html_e('ProEventsWP settings', 'proeventswp'); ?></h1>
        <nav class="nav-tab-wrapper pcwp-settings-tabs" aria-label="<?php esc_attr_e('ProEventsWP settings', 'proeventswp'); ?>">
        <?php foreach ($tabs as $key => $label) : ?>
            <a class="nav-tab <?php echo $key === $tab ? 'nav-tab-active' : ''; ?>" href="<?php echo esc_url(self::url($key)); ?>" <?php echo $key === $tab ? 'aria-current="page"' : ''; ?>><?php echo esc_html($label); ?></a>
        <?php endforeach; ?></nav>
        <?php settings_errors(); ?>
        <?php if ($tab === 'calendar') : ?>
            <section class="pcwp-settings-panel" aria-labelledby="pcwp-calendar-heading"><h2 id="pcwp-calendar-heading"><?php esc_html_e('Calendar', 'proeventswp'); ?></h2>
            <form method="post" action="options.php"><?php settings_fields('pcwp_settings');
            do_settings_sections('pcwp-settings');
            submit_button(); ?></form></section>
        <?php elseif ($tab === 'maps') : ?>
            <?php MapSettings::render(); ?>
        <?php else : ?>
            <?php do_action('pcwp_settings_license'); ?>
            <?php if (has_action('pcwp_settings_ai')) : ?>
                <?php do_action('pcwp_settings_ai'); ?>
            <?php else : ?>
                <section class="pcwp-settings-panel" aria-labelledby="pcwp-ai-heading"><h2 id="pcwp-ai-heading"><?php esc_html_e('Included Pro AI', 'proeventswp'); ?></h2>
                <p><?php esc_html_e('Hosted AI requires the Pro plugin and an active Pro license. Each license includes 50 event drafts and 5 images per UTC calendar month, shared across its sites. Free event features work without connecting.', 'proeventswp'); ?></p></section>
            <?php endif; ?>
        <?php endif; ?></div>
        <?php
    }

    public function viewField(): void
    {
        $selected = (string) get_option('pcwp_default_view', 'list');
        echo '<select id="pcwp_default_view" name="pcwp_default_view">';
        foreach (['list' => __('List', 'proeventswp'), 'photo' => __('Photo', 'proeventswp'), 'month' => __('Month', 'proeventswp'), 'day' => __('Day', 'proeventswp'), 'week' => __('Week', 'proeventswp'), 'map' => __('Map', 'proeventswp')] as $value => $label) {
            echo '<option value="' . esc_attr($value) . '" ' . selected($selected, $value, false) . '>' . esc_html($label) . '</option>';
        }
        echo '</select>';
    }

    private function textField(string $option, string $label): void
    {
        add_settings_field($option, $label, static function () use ($option): void {
            echo '<input class="regular-text" id="' . esc_attr($option) . '" name="' . esc_attr($option) . '" value="' . esc_attr((string) get_option($option)) . '">';
        }, 'pcwp-settings', 'pcwp_urls', ['label_for' => $option]);
    }
}