/**
 * Academic Pass AJAX flow
 */

define('VP_ACADEMIC_SUCCESS_PAGE_ID', 155351);

add_action('wp_enqueue_scripts', function () {
    wp_enqueue_script('jquery');

    wp_register_script(
        'vp-academic-pass',
        get_template_directory_uri() . '/frontend/js/vp-academic-pass.js',
        array('jquery'),
        '1.0.0',
        true
    );

    wp_localize_script('vp-academic-pass', 'vpAcademicPass', array(
        'ajaxUrl' => admin_url('admin-ajax.php'),
        'nonce'   => wp_create_nonce('vp_academic_pass_nonce'),
        'pageId'  => get_queried_object_id(),
    ));

    wp_enqueue_script('vp-academic-pass');
});

function vp_academic_email_content_type() {
    return 'text/html';
}

function vp_academic_get_email_domain($email) {
    $email = strtolower(trim($email));
    $parts = explode('@', $email);

    return count($parts) === 2 ? $parts[1] : '';
}

function vp_academic_ends_with($haystack, $needle) {
    $haystack = strtolower($haystack);
    $needle = strtolower($needle);

    if ($needle === '') {
        return true;
    }

    return substr($haystack, -strlen($needle)) === $needle;
}

function vp_academic_domain_allowed($email_domain, $allowed_domains_raw) {
    $email_domain = strtolower(trim($email_domain));
    $allowed_domains = preg_split('/\r\n|\r|\n/', (string) $allowed_domains_raw);

    foreach ($allowed_domains as $allowed_domain) {
        $allowed_domain = strtolower(trim($allowed_domain));

        if (!$allowed_domain) {
            continue;
        }

        // Exact match: fzs.edu.rs
        if ($email_domain === $allowed_domain) {
            return true;
        }

        // Wildcard match: *.edu.rs
        if (strpos($allowed_domain, '*.') === 0) {
            $base_domain = substr($allowed_domain, 2);

            if ($email_domain === $base_domain || vp_academic_ends_with($email_domain, '.' . $base_domain)) {
                return true;
            }
        }
    }

    return false;
}

function vp_user_has_subscription_product($user_id, $product_id) {
    if (!function_exists('wcs_get_users_subscriptions')) {
        return false;
    }

    $subscriptions = wcs_get_users_subscriptions($user_id);

    foreach ($subscriptions as $subscription) {
        if (!$subscription) {
            continue;
        }

        if (!in_array($subscription->get_status(), array('active', 'on-hold', 'pending'), true)) {
            continue;
        }

        foreach ($subscription->get_items() as $item) {
            if ((int) $item->get_product_id() === (int) $product_id) {
                return true;
            }
        }
    }

    return false;
}

function vp_academic_create_subscription_for_user($user_id, $email, $product_id) {
    if (!function_exists('wc_create_order') || !function_exists('wcs_create_subscription')) {
        return new WP_Error('missing_woocommerce', 'WooCommerce Subscriptions nije dostupan.');
    }

    $product = wc_get_product($product_id);

    if (!$product) {
        return new WP_Error('missing_product', 'Pretplata nije pronađena.');
    }

    $user = get_user_by('id', $user_id);

    $order = wc_create_order(array(
        'customer_id' => $user_id,
    ));

    if (is_wp_error($order)) {
        return $order;
    }

    $order->add_product($product, 1);

    $order->set_address(array(
        'first_name' => $user && $user->first_name ? $user->first_name : 'Academic',
        'last_name'  => $user && $user->last_name ? $user->last_name : 'Pass',
        'email'      => $email,
        'phone'      => '-',
        'address_1'  => 'Adresa',
        'address_2'  => '',
        'city'       => 'Beograd',
        'state'      => 'RS',
        'postcode'   => '11000',
        'country'    => 'RS',
    ), 'billing');

    $order->calculate_totals();
    $order->update_status('completed', 'Academic Pass order created', true);

    $subscription = wcs_create_subscription(array(
        'order_id'         => $order->get_id(),
        'customer_id'      => $user_id,
        'status'           => 'active',
        'billing_period'   => WC_Subscriptions_Product::get_period($product),
        'billing_interval' => WC_Subscriptions_Product::get_interval($product),
    ));

    if (is_wp_error($subscription)) {
        return $subscription;
    }

    $subscription->add_product($product, 1);

    /**
     * Uzimamo samo END date sa WooCommerce Subscription proizvoda.
     * Ne setujemo trial_end i next_payment.
     */
    $start_date = gmdate('Y-m-d H:i:s');

    $end_date = WC_Subscriptions_Product::get_expiration_date(
        $product,
        $start_date
    );

    if ($end_date) {
        $subscription->update_dates(array(
            'end' => $end_date,
        ));
    }

    $subscription->calculate_totals();
    $subscription->save();

    return $subscription;
}

/**
 * AJAX: submit forme.
 * Ovde se NE kreira korisnik.
 * Samo se proverava email, domen i šalje magic link.
 */
add_action('wp_ajax_vp_academic_send_link', 'vp_academic_send_link');
add_action('wp_ajax_nopriv_vp_academic_send_link', 'vp_academic_send_link');

function vp_academic_send_link() {
    check_ajax_referer('vp_academic_pass_nonce', 'nonce');

    $email = isset($_POST['academic_email']) ? sanitize_email($_POST['academic_email']) : '';
    $page_id = isset($_POST['page_id']) ? absint($_POST['page_id']) : 0;

    if (!is_email($email)) {
        wp_send_json_error(array(
            'message' => 'Unesite ispravnu email adresu.',
        ));
    }

    if (!$page_id) {
        wp_send_json_error(array(
            'message' => 'Stranica nije validna.',
        ));
    }

    $academic_domains_raw = get_field('academic_domains', $page_id);
    $target_product_id = (int) get_field('academic_subscription', $page_id);

    if (!$target_product_id) {
        wp_send_json_error(array(
            'message' => 'Pretplata nije podešena.',
        ));
    }

    $email_domain = vp_academic_get_email_domain($email);

    if (!vp_academic_domain_allowed($email_domain, $academic_domains_raw)) {
        wp_send_json_error(array(
            'message' => 'Uneli ste pogrešan mejl ili vaš akademski domen trenutno nije podržan za automatsku aktivaciju. Pošaljite mejl na pretplata@velikeprice.com ako mislite da je ovo greška.',
        ));
    }

    $existing_user = get_user_by('email', $email);

    if ($existing_user && vp_user_has_subscription_product($existing_user->ID, $target_product_id)) {
        wp_send_json_error(array(
            'message' => 'Već imate akademski pristup na ovoj adresi. Ukoliko ste zaboravili šifru, otvorite stranicu Moj nalog.',
        ));
    }

    $token = wp_generate_password(48, false, false);
    $token_hash = hash('sha256', $token);
    $transient_key = 'vp_academic_token_' . $token_hash;
    $expires_at = time() + (30 * MINUTE_IN_SECONDS);

    set_transient($transient_key, array(
        'email'      => $email,
        'product_id' => $target_product_id,
        'page_id'    => $page_id,
        'created'    => time(),
        'expires_at' => $expires_at,
        'activated'  => 0,
        'user_id'    => 0,
    ), 30 * MINUTE_IN_SECONDS);

    $activation_url = add_query_arg(array(
        'academic_activate' => 1,
        'token'             => rawurlencode($token),
    ), get_permalink($page_id));

    add_filter('wp_mail_content_type', 'vp_academic_email_content_type');

    $subject = 'Velike priče - aktivacija akademskog pristupa';

    $body = '
        Poštovani,<br><br>
        Kliknite na link ispod kako biste aktivirali svoj akademski pristup:<br><br>
        <a href="' . esc_url($activation_url) . '">Aktivirajte akademski pristup</a><br><br>
        Link važi 30 minuta.<br><br>
        Srdačan pozdrav,<br>
        Velike priče
    ';

    $mail_sent = wp_mail($email, $subject, $body);

    remove_filter('wp_mail_content_type', 'vp_academic_email_content_type');

    if (!$mail_sent) {
        delete_transient($transient_key);

        wp_send_json_error(array(
            'message' => 'Email nije poslat. Pokušajte ponovo ili nas kontaktirajte.',
        ));
    }

    wp_send_json_success(array(
        'message' => 'Poslali smo vam link za aktivaciju. Proverite inbox.',
    ));
}

/**
 * Magic link aktivacija.
 * Ovde se kreira korisnik ako ne postoji.
 * Ako postoji, samo mu se dodaje pretplata.
 */
add_action('template_redirect', function () {
    if (empty($_GET['academic_activate']) || empty($_GET['token'])) {
        return;
    }

    $token = sanitize_text_field(wp_unslash($_GET['token']));
    $transient_key = 'vp_academic_token_' . hash('sha256', $token);
    $token_data = get_transient($transient_key);

    if (!$token_data || empty($token_data['email']) || empty($token_data['product_id']) || empty($token_data['expires_at'])) {
        global $wp_query;
        $wp_query->set_404();
        status_header(404);
        nocache_headers();
        include get_query_template('404');
        exit;
    }

    if ((int) $token_data['expires_at'] < time()) {
        delete_transient($transient_key);

        global $wp_query;
        $wp_query->set_404();
        status_header(404);
        nocache_headers();
        include get_query_template('404');
        exit;
    }

    $email = sanitize_email($token_data['email']);
    $product_id = (int) $token_data['product_id'];

    /**
     * Ako je token već aktiviran, pusti ga samo ako može da prikaže success.
     */
    if (!empty($token_data['activated']) && !empty($token_data['user_id'])) {
        $user = get_user_by('id', (int) $token_data['user_id']);

        if ($user) {
            wp_set_current_user($user->ID);
            wp_set_auth_cookie($user->ID, true);
            do_action('wp_login', $user->user_login, $user);

            wp_safe_redirect(add_query_arg(array(
                'token' => rawurlencode($token),
            ), get_permalink(VP_ACADEMIC_SUCCESS_PAGE_ID)));
            exit;
        }
    }

    $user = get_user_by('email', $email);

    if ($user && vp_user_has_subscription_product($user->ID, $product_id)) {
        wp_safe_redirect(add_query_arg(array(
            'academic_error' => 'already_exists',
        ), get_permalink((int) $token_data['page_id'])));
        exit;
    }

    if (!$user) {
        $random_password = wp_generate_password(24, true, true);

        $user_id = wp_insert_user(array(
            'user_login'    => $email,
            'user_pass'     => $random_password,
            'user_email'    => $email,
            'display_name'  => $email,
            'user_nicename' => sanitize_title(current(explode('@', $email))),
            'role'          => 'customer',
        ));

        if (is_wp_error($user_id)) {
            wp_die('Došlo je do greške prilikom kreiranja naloga.');
        }

        $user = get_user_by('id', $user_id);

        /**
         * WordPress šalje email korisniku da postavi šifru.
         * Random password se ne šalje direktno korisniku.
         */
        wp_new_user_notification($user_id, null, 'user');
    }

    $subscription = vp_academic_create_subscription_for_user($user->ID, $email, $product_id);

    if (is_wp_error($subscription)) {
        wp_die($subscription->get_error_message());
    }

    $remaining_ttl = max(1, (int) $token_data['expires_at'] - time());

    $token_data['activated'] = 1;
    $token_data['user_id'] = $user->ID;

    set_transient($transient_key, $token_data, $remaining_ttl);

    wp_set_current_user($user->ID);
    wp_set_auth_cookie($user->ID, true);
    do_action('wp_login', $user->user_login, $user);

    wp_safe_redirect(add_query_arg(array(
        'token' => rawurlencode($token),
    ), get_permalink(VP_ACADEMIC_SUCCESS_PAGE_ID)));
    exit;
});

/**
 * AJAX: success strana proverava token.
 */
add_action('wp_ajax_vp_academic_success_data', 'vp_academic_success_data');
add_action('wp_ajax_nopriv_vp_academic_success_data', 'vp_academic_success_data');

function vp_academic_success_data() {
    check_ajax_referer('vp_academic_pass_nonce', 'nonce');

    $token = isset($_POST['token']) ? sanitize_text_field(wp_unslash($_POST['token'])) : '';

    if (!$token) {
        wp_send_json_error(array(
            'message' => 'Token nije validan.',
        ));
    }

    $transient_key = 'vp_academic_token_' . hash('sha256', $token);
    $token_data = get_transient($transient_key);

    if (!$token_data || empty($token_data['activated']) || empty($token_data['user_id']) || empty($token_data['email']) || empty($token_data['expires_at'])) {
        wp_send_json_error(array(
            'message' => 'Link nije validan ili je istekao.',
        ));
    }

    if ((int) $token_data['expires_at'] < time()) {
        delete_transient($transient_key);

        wp_send_json_error(array(
            'message' => 'Link nije validan ili je istekao.',
        ));
    }

    if (!is_user_logged_in() || get_current_user_id() !== (int) $token_data['user_id']) {
        wp_send_json_error(array(
            'message' => 'Nemate pristup ovoj strani.',
        ));
    }

    wp_send_json_success(array(
        'email' => sanitize_email($token_data['email']),
    ));
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<url>
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<news:language>sr</news:language>
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<news:language>sr</news:language>
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