<?php

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

class AgeVerif_Admin
{
    public function __construct()
    {
        add_action('admin_menu', [$this, 'register_menu']);
        add_action('admin_init', [$this, 'register_settings']);
        add_action('admin_enqueue_scripts', [$this, 'enqueue_assets']);
        add_action('admin_head', [$this, 'suppress_foreign_notices']);
    }

    public function suppress_foreign_notices(): void
    {
        $screen = get_current_screen();
        if ($screen && str_contains($screen->id, 'ageverif')) {
            remove_all_actions('admin_notices');
            remove_all_actions('all_admin_notices');
        }
    }

    // Register plugin menu/submenus in the WordPress admin area
    public function register_menu(): void
    {
        add_menu_page(
            __('AgeVerif', 'ageverif'),
            __('AgeVerif', 'ageverif'),
            'manage_options',
            'ageverif',
            [$this, 'render_getting_started_page'],
            $this->get_menu_icon(),
            58
        );

        add_submenu_page(
            'ageverif',
            __('Getting Started', 'ageverif'),
            __('Getting Started', 'ageverif'),
            'manage_options',
            'ageverif',
            [$this, 'render_getting_started_page']
        );

        add_submenu_page(
            'ageverif',
            __('Plugin Settings', 'ageverif'),
            __('Plugin Settings', 'ageverif'),
            'manage_options',
            'ageverif-settings',
            [$this, 'render_settings_page']
        );

        add_submenu_page(
            'ageverif',
            __('Frequently Asked Questions', 'ageverif'),
            __('FAQ', 'ageverif'),
            'manage_options',
            'ageverif-faq',
            [$this, 'render_faq_page']
        );
    }

    // Get the menu icon for the plugin
    private function get_menu_icon(): string
    {
        $icon_path = AGEVERIF_PATH . 'assets/img/favicon.svg';
        if (is_readable($icon_path)) {
            $svg = file_get_contents($icon_path);
            if (is_string($svg) && $svg !== '') return 'data:image/svg+xml;base64,' . base64_encode($svg);
        }
        return '';
    }

    public function register_settings(): void
    {
        register_setting(
            'ageverif_settings_group',
            'ageverif_settings',
            [$this, 'sanitize_settings']
        );
    }

    public function enqueue_assets(string $hook): void
    {
        if ( ! str_contains($hook, 'ageverif')) return;

        wp_enqueue_style(
            'ageverif-admin',
            AGEVERIF_URL . 'assets/css/admin.css',
            [],
            AGEVERIF_VERSION
        );

        wp_enqueue_script(
            'ageverif-admin-settings',
            AGEVERIF_URL . 'assets/js/admin-settings.js',
            [],
            AGEVERIF_VERSION,
            true
        );
    }

    // Helper function to sanitize and validate input settings
    public function sanitize_settings(mixed $input): array
    {
        // WordPress may pass null or a scalar here (e.g. update_option() called elsewhere)
        if (! is_array($input)) $input = [];

        $defaults         = ageverif_default_settings();
        $current_settings = get_option('ageverif_settings', []);

        if (! is_array($current_settings))  $current_settings = [];
        $output = array_merge($defaults, $current_settings);

        if (array_key_exists('website_key', $input))
            $output['website_key'] = sanitize_text_field((string) $input['website_key']);

        if (array_key_exists('display_mode', $input)) {
            $mode                   = sanitize_text_field((string) $input['display_mode']);
            $allowed_modes          = ['all', 'include', 'exclude'];
            $output['display_mode'] = in_array($mode, $allowed_modes, true) ? $mode : 'all';
        }

        if (array_key_exists('url_patterns', $input))
            $output['url_patterns'] = $this->sanitize_url_patterns($input['url_patterns']);

        $output['enabled'] = ! empty($input['enabled']) ? 1 : 0;

        if (array_key_exists('admin_mode', $input)) {
            $admin_mode             = sanitize_text_field((string) $input['admin_mode']);
            $allowed_admin_modes    = ['everyone', 'admins_only', 'skip_admins'];
            $output['admin_mode']   = in_array($admin_mode, $allowed_admin_modes, true) ? $admin_mode : 'skip_admins';
        }

        return $output;
    }

    // Helper function to sanitize and validate URL patterns
    private function sanitize_url_patterns(mixed $value): array
    {
        if (is_array($value)) $value = implode("\n", array_map(static fn(mixed $v): string => is_scalar($v) ? (string) $v : '', $value));

        $lines = preg_split('/\r\n|\r|\n/', (string) $value);
        if (! is_array($lines)) return [];

        $patterns = [];
        foreach ($lines as $line) {
            $pattern = trim(wp_unslash((string) $line));
            if ($pattern === '') continue;
            $patterns[] = sanitize_text_field($pattern);
        }

        return array_values(array_unique($patterns));
    }

    // Render common admin header
    private function render_admin_header(): void
    {
?>
        <div class="ageverif-header">
            <a href="<?php echo esc_url('https://www.ageverif.com'); ?>" target="_blank" rel="noopener noreferrer" aria-label="AgeVerif website" class="ageverif-header-logo">
                <img src="<?php echo esc_url(AGEVERIF_URL . 'assets/img/logo.svg'); ?>" alt="AgeVerif">
            </a>
            <h1><?php echo esc_html(get_admin_page_title()); ?></h1>
        </div>
    <?php
    }

    // Render common admin footer
    private function render_admin_footer(): void
    {
    ?>
        <p class="ageverif-admin-footer">
            Powered by <a href="<?php echo esc_url('https://www.ageverif.com'); ?>" target="_blank" rel="noopener noreferrer">AgeVerif</a>
        </p>
    <?php
    }

    // render getting started page
    public function render_getting_started_page(): void
    {
    ?>
        <div class="wrap ageverif-admin-wrap">
            <?php $this->render_admin_header(); ?>

            <div class="ageverif-card">
                <blockquote>
                    <p>
                        To use the AgeVerif plugin, you need to have a valid <strong>&#x1F7E2; Public Live Key</strong> from our Webmasters Platform.
                        If you don't have one yet, please follow these steps:
                    </p>
                </blockquote>
                <ol>
                    <li>
                        Register on our <strong>Webmasters Platform</strong> as a webmaster at
                        <a href="<?php echo esc_url('https://webmasters.ageverif.com'); ?>" target="_blank" rel="noopener noreferrer">https://webmasters.ageverif.com</a>.
                    </li>
                    <li>
                        Add your website domain to our platform at
                        <a href="<?php echo esc_url('https://webmasters.ageverif.com/website/add'); ?>" target="_blank" rel="noopener noreferrer">https://webmasters.ageverif.com/website/add</a>.
                    </li>
                    <li>
                        Copy your website <strong>Public Live Key</strong> from the Webmasters Platform at
                        <a href="<?php echo esc_url('https://webmasters.ageverif.com'); ?>" target="_blank" rel="noopener noreferrer">https://webmasters.ageverif.com</a>.
                    </li>
                    <li>Enter it in the Website Public Live Key field in the <strong>Plugin Settings</strong> area.</li>
                    <li>While in the Plugin Settings area, choose where we should trigger the age verification procedure.</li>
                    <li>Save settings and that's it! AgeVerif's Checker Script is now integrated on your website.</li>
                </ol>
                <a class="button button-primary" href="<?php echo esc_url(admin_url('admin.php?page=ageverif-settings')); ?>">
                    Open Plugin Settings
                </a>
                <p>
                    Having issues with the plugin integration?
                    Click <a href="<?php echo esc_url('https://docs.ageverif.com/checker.html#common-issues'); ?>" target="_blank" rel="noopener noreferrer">here</a>
                    to see common issues and their solutions
                </p>
                <?php $this->render_admin_footer(); ?>
            </div>
        </div>
    <?php
    }

    // Render plugin settings page
    public function render_settings_page(): void
    {
        $settings           = ageverif_get_settings();
        $current_mode       = (string) ($settings['display_mode'] ?? 'all');
        $current_admin_mode = (string) ($settings['admin_mode'] ?? 'skip_admins');
        $is_enabled         = ! empty($settings['enabled']);
        $disable_patterns   = ($current_mode === 'all');
        $url_patterns       = array_filter(
            array_map(static fn(mixed $p): string => is_scalar($p) ? trim((string) $p) : '', (array) ($settings['url_patterns'] ?? [])),
            static fn(string $p): bool => $p !== ''
        );
        $url_patterns_value = esc_textarea(implode("\n", $url_patterns));
    ?>
        <div class="wrap ageverif-admin-wrap">
            <?php $this->render_admin_header(); ?>

            <form method="post" action="options.php" class="ageverif-card">
                <?php settings_fields('ageverif_settings_group'); ?>

                <table class="form-table" role="presentation">
                    <tr>
                        <th scope="row">AgeVerif Status</th>
                        <td>
                            <div class="ageverif-setting-control">
                                <label class="ageverif-toggle">
                                    <input
                                        type="checkbox"
                                        id="ageverif_enabled"
                                        name="ageverif_settings[enabled]"
                                        value="1"
                                        <?php checked($is_enabled); ?> />
                                    <span class="ageverif-toggle-slider"></span>
                                </label>
                                <span class="ageverif-toggle-label" id="ageverif_enabled_label"><?php echo $is_enabled ? esc_html__('Enabled', 'ageverif') : esc_html__('Disabled', 'ageverif'); ?></span>
                            </div>
                            <p class="description">Enable or disable the AgeVerif Checker on this website.</p>
                        </td>
                    </tr>

                    <tr>
                        <th scope="row">
                            <label for="ageverif_website_key">Website Public Live Key</label>
                        </th>
                        <td>
                            <input
                                id="ageverif_website_key"
                                name="ageverif_settings[website_key]"
                                type="text"
                                class="regular-text"
                                value="<?php echo esc_attr($settings['website_key'] ?? ''); ?>"
                                placeholder="Enter your Public Live Key here" />
                            <p class="description">Paste the key from your AgeVerif Webmasters area.</p>
                        </td>
                    </tr>

                    <tr>
                        <th scope="row">Where To Trigger Verification</th>
                        <td>
                            <select id="ageverif_display_mode" name="ageverif_settings[display_mode]">
                                <option value="all" <?php selected($current_mode, 'all'); ?>>
                                    All pages (default)
                                </option>
                                <option value="include" <?php selected($current_mode, 'include'); ?>>
                                    Only matching URLs
                                </option>
                                <option value="exclude" <?php selected($current_mode, 'exclude'); ?>>
                                    All pages except matching URLs
                                </option>
                            </select>
                            <p class="description">Choose whether the URL patterns below define where the checker loads or where it is skipped.</p>
                        </td>
                    </tr>

                    <tr>
                        <th scope="row">
                            <label for="ageverif_url_patterns">URL Patterns</label>
                        </th>
                        <td>
                            <textarea
                                id="ageverif_url_patterns"
                                name="ageverif_settings[url_patterns]"
                                rows="6"
                                class="large-text code"
                                <?php disabled($disable_patterns); ?>><?php echo $url_patterns_value; ?></textarea>
                            <p class="description">One pattern per line. Wildcards (*) are supported.</p>
                            <p class="description">Only used when trigger mode is set to "Only matching URLs" or "All pages except matching URLs".</p>
                        </td>
                    </tr>

                    <tr>
                        <th scope="row">Visitor Mode</th>
                        <td>
                            <fieldset class="ageverif-mode-options">
                                <label class="ageverif-radio-option">
                                    <input type="radio" name="ageverif_settings[admin_mode]" value="everyone"
                                        <?php checked($current_admin_mode, 'everyone'); ?> />
                                    <span class="ageverif-toggle-label">All Visitors</span>
                                </label>
                                <p class="description">Show the checker to every visitor, including WordPress Admins.</p>

                                <label class="ageverif-radio-option">
                                    <input type="radio" name="ageverif_settings[admin_mode]" value="skip_admins"
                                        <?php checked($current_admin_mode, 'skip_admins'); ?> />
                                    <span class="ageverif-toggle-label">All Except Admins</span>
                                </label>
                                <p class="description">Show the checker to everyone except logged-in WordPress Admins.</p>

                                <label class="ageverif-radio-option">
                                    <input type="radio" name="ageverif_settings[admin_mode]" value="admins_only"
                                        <?php checked($current_admin_mode, 'admins_only'); ?> />
                                    <span class="ageverif-toggle-label">Admins Only</span>
                                </label>
                                <p class="description">Show the checker only to logged-in WordPress Admins. Useful for testing purposes.</p>
                            </fieldset>
                        </td>
                    </tr>

                </table>

                <div class="ageverif-actions">
                    <?php submit_button('Save Settings', 'primary', 'submit', false); ?>
                    <?php if (sanitize_text_field(wp_unslash((string) ($_GET['settings-updated'] ?? ''))) === 'true') : ?>
                        <span class="ageverif-saved-text">&#10003; Settings Saved</span>
                    <?php endif; ?>
                </div>
                <?php $this->render_admin_footer(); ?>
            </form>

        </div>
    <?php
    }

    // Render FAQ page
    public function render_faq_page(): void
    {
    ?>
        <div class="wrap ageverif-admin-wrap">
            <?php $this->render_admin_header(); ?>

            <div class="ageverif-card">
                <h2>Does the Checker Script prevent my website from being crawled and indexed by search engines?</h2>
                <blockquote>
                    <p>No, the <code>checker.js</code> script is designed to be SEO-friendly and allows search engines and AI bots like Google, ChatGPT, and Facebook to crawl and index your website. The age verification flow is not displayed to trusted bots, ensuring your content remains discoverable in search results while still enforcing age verification for regular visitors.</p>
                </blockquote>

                <h2>Can I use the same key for multiple websites?</h2>
                <blockquote>
                    <p>
                        No, this plugin uses the <a href="<?php echo esc_url('https://docs.ageverif.com/checker.html'); ?>" target="_blank" rel="noopener noreferrer">Checker Script (SDK)</a>
                        integration, each website must have its own <strong>&#x1F7E2; Public Live Key</strong>.
                        <br>However, the key works on all subdomains of the same root domain.
                    </p>
                    <p>E.g. A key configured for <code>example.org</code> will work on <code>www.example.org</code> and <code>another.example.org</code>.</p>
                </blockquote>
                <blockquote>
                    <p>
                        If you have many websites, perhaps the
                        <a href="<?php echo esc_url('https://docs.ageverif.com/oauth2.html'); ?>" target="_blank" rel="noopener noreferrer">OAuth2 integration</a>
                        is a better fit, allowing you to use the same client credentials with different redirect URIs for each website or handle the redirection logic on your side via the <code>state</code> parameter.
                    </p>
                </blockquote>

                <h2>For how long is a visitor verified?</h2>
                <blockquote>
                    <p>
                        The duration a visitor is considered verified depends on their country's jurisdiction, for more information please refer to our <a href="<?php echo esc_url('https://www.ageverif.com/compliance-and-policies-framework'); ?>" target="_blank" rel="noopener noreferrer">Compliance and Policies</a>.
                    </p>
                </blockquote>

                <h2>Do you have an example where I can see the age verification in action?</h2>
                <blockquote>
                    <p>
                        Yes, you can see the Checker in action on our demo website:
                        <a href="<?php echo esc_url('https://demo.ageverif.com/'); ?>" target="_blank" rel="noopener noreferrer">https://demo.ageverif.com</a>
                    </p>
                </blockquote>

                <p>
                    Additional questions? 
                    Check our <a href="<?php echo esc_url('https://docs.ageverif.com/plugins.html#wordpress-woocommerce'); ?>" target="_blank" rel="noopener noreferrer">Plugin Documentation</a> 
                    or contact us through <a href="mailto:support@ageverif.com">support@ageverif.com</a>
                </p>
                <?php $this->render_admin_footer(); ?>
            </div>
        </div>
<?php
    }
}