<?php
/**
 * Plugin Name: 4else Events – Event Teaser & Booking Connector
 * Plugin URI: https://4else.events/wordpress-plugin/
 * Description: Display your 4else event calendar in WordPress using a simple shortcode.
 * Version: 0.2.5
 * Author: fourelse ag
 * Author URI: https://4else.events/
 * Text Domain: 4else-events-event-teaser-booking-connector
 * Domain Path: /languages
 * Requires at least: 6.0
 * Requires PHP: 7.4
 * License: GPLv2 or later
 * License URI: https://www.gnu.org/licenses/gpl-2.0.html
 */

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

define('FOURELSE_EVENTS_CONNECTOR_VERSION', '0.2.5');
define('FOURELSE_EVENTS_CONNECTOR_OPTION', 'fourelse_events_connector_options');

add_action('admin_menu', 'fourelse_events_connector_admin_menu');
add_action('admin_init', 'fourelse_events_connector_register_settings');
add_action('admin_enqueue_scripts', 'fourelse_events_connector_admin_scripts');
add_shortcode('fourelse_events', 'fourelse_events_connector_shortcode');

function fourelse_events_connector_admin_menu() {
    add_menu_page(
        __('4else Events', '4else-events-event-teaser-booking-connector'),
        __('4else Events', '4else-events-event-teaser-booking-connector'),
        'manage_options',
        'fourelse-events-connector',
        'fourelse_events_connector_settings_page',
        'dashicons-calendar-alt',
        56
    );
}

function fourelse_events_connector_admin_scripts($hook) {
    if ($hook !== 'toplevel_page_fourelse-events-connector') {
        return;
    }

    wp_register_script(
        'fourelse-events-connector-admin',
        '',
        array(),
        FOURELSE_EVENTS_CONNECTOR_VERSION,
        true
    );

    wp_enqueue_script('fourelse-events-connector-admin');

    $copied_text = esc_js(__('Copied!', '4else-events-event-teaser-booking-connector'));
    $copy_text = esc_js(__('Copy shortcode', '4else-events-event-teaser-booking-connector'));

    wp_add_inline_script(
        'fourelse-events-connector-admin',
        "
        document.addEventListener('DOMContentLoaded', function () {
            var button = document.getElementById('fourelse-copy-shortcode');
            var shortcode = document.getElementById('fourelse-shortcode');
            if (!button || !shortcode) {
                return;
            }

            button.addEventListener('click', function () {
                var text = shortcode.textContent || shortcode.innerText;

                if (navigator.clipboard && navigator.clipboard.writeText) {
                    navigator.clipboard.writeText(text).then(function () {
                        button.textContent = '{$copied_text}';
                        setTimeout(function () { button.textContent = '{$copy_text}'; }, 1800);
                    });
                } else {
                    var temp = document.createElement('textarea');
                    temp.value = text;
                    document.body.appendChild(temp);
                    temp.select();
                    document.execCommand('copy');
                    document.body.removeChild(temp);
                    button.textContent = '{$copied_text}';
                    setTimeout(function () { button.textContent = '{$copy_text}'; }, 1800);
                }
            });
        });
        "
    );
}

function fourelse_events_connector_register_settings() {
    register_setting(
        'fourelse_events_connector_settings',
        FOURELSE_EVENTS_CONNECTOR_OPTION,
        array(
            'sanitize_callback' => 'fourelse_events_connector_sanitize_options',
            'default' => array(
                'eventeas_code' => '',
                'fallback_text' => __('Currently no events are available.', '4else-events-event-teaser-booking-connector'),
            ),
        )
    );

    add_settings_section(
        'fourelse_events_connector_main',
        __('4else EvenTeas connection', '4else-events-event-teaser-booking-connector'),
        'fourelse_events_connector_section_intro',
        'fourelse-events-connector'
    );

    add_settings_field(
        'eventeas_code',
        __('EvenTeas code', '4else-events-event-teaser-booking-connector'),
        'fourelse_events_connector_code_field',
        'fourelse-events-connector',
        'fourelse_events_connector_main'
    );

    add_settings_field(
        'fallback_text',
        __('Fallback text', '4else-events-event-teaser-booking-connector'),
        'fourelse_events_connector_fallback_field',
        'fourelse-events-connector',
        'fourelse_events_connector_main'
    );
}

function fourelse_events_connector_sanitize_options($input) {
    $output = array();

    if (isset($input['eventeas_code'])) {
        $raw_code = wp_unslash($input['eventeas_code']);

        /*
         * The EvenTeas embed code intentionally contains HTML and JavaScript.
         * Only administrators with the manage_options capability can save this option.
         */
        $allowed_html = array(
            'div' => array(
                'id' => true,
                'class' => true,
                'style' => true,
                'data-*' => true,
            ),
            'iframe' => array(
                'src' => true,
                'width' => true,
                'height' => true,
                'style' => true,
                'frameborder' => true,
                'allowfullscreen' => true,
                'loading' => true,
            ),
            'script' => array(
                'src' => true,
                'type' => true,
                'async' => true,
                'defer' => true,
            ),
            'a' => array(
                'href' => true,
                'target' => true,
                'rel' => true,
                'class' => true,
            ),
        );

        $output['eventeas_code'] = wp_kses(trim($raw_code), $allowed_html);
    }

    if (isset($input['fallback_text'])) {
        $output['fallback_text'] = sanitize_text_field(wp_unslash($input['fallback_text']));
    }

    return $output;
}

function fourelse_events_connector_section_intro() {
    echo '<p>' . esc_html__('Paste your individual 4else EvenTeas code here. Afterwards you can display your event calendar with the shortcode [fourelse_events].', '4else-events-event-teaser-booking-connector') . '</p>';
}

function fourelse_events_connector_code_field() {
    $options = get_option(FOURELSE_EVENTS_CONNECTOR_OPTION);
    $value = isset($options['eventeas_code']) ? $options['eventeas_code'] : '';

    echo '<textarea name="' . esc_attr(FOURELSE_EVENTS_CONNECTOR_OPTION) . '[eventeas_code]" rows="12" cols="90" class="large-text code" placeholder="' . esc_attr__('Paste EvenTeas code here', '4else-events-event-teaser-booking-connector') . '">' . esc_textarea($value) . '</textarea>';
    echo '<p class="description">' . esc_html__('You can find this code in your 4else account under Manage → Own homepage.', '4else-events-event-teaser-booking-connector') . '</p>';
}

function fourelse_events_connector_fallback_field() {
    $options = get_option(FOURELSE_EVENTS_CONNECTOR_OPTION);
    $value = isset($options['fallback_text']) ? $options['fallback_text'] : __('Currently no events are available.', '4else-events-event-teaser-booking-connector');

    echo '<input type="text" name="' . esc_attr(FOURELSE_EVENTS_CONNECTOR_OPTION) . '[fallback_text]" value="' . esc_attr($value) . '" class="regular-text">';
    echo '<p class="description">' . esc_html__('This text is shown if no EvenTeas code has been saved yet.', '4else-events-event-teaser-booking-connector') . '</p>';
}

function fourelse_events_connector_settings_page() {
    if (!current_user_can('manage_options')) {
        return;
    }

    ?>
    <div class="wrap">
        <h1><?php echo esc_html__('4else Events – Event Teaser & Booking Connector', '4else-events-event-teaser-booking-connector'); ?></h1>

        <div style="max-width: 900px;">
            <p>
                <?php echo esc_html__('Connect your WordPress website with 4else – a complete solution for event and participant management including registration, ticketing and optional payment.', '4else-events-event-teaser-booking-connector'); ?>
            </p>

            <form action="options.php" method="post">
                <?php
                settings_fields('fourelse_events_connector_settings');
                do_settings_sections('fourelse-events-connector');
                submit_button(__('Save settings', '4else-events-event-teaser-booking-connector'));
                ?>
            </form>

            <hr>

            <h2><?php echo esc_html__('Embed', '4else-events-event-teaser-booking-connector'); ?></h2>
            <p><?php echo esc_html__('Add this shortcode to a page, post, shortcode block or Divi module:', '4else-events-event-teaser-booking-connector'); ?></p>
            <p>
                <code id="fourelse-shortcode">[fourelse_events]</code>
                <button type="button" id="fourelse-copy-shortcode" class="button button-secondary" style="margin-left: 8px;">
                    <?php echo esc_html__('Copy shortcode', '4else-events-event-teaser-booking-connector'); ?>
                </button>
            </p>
        </div>
    </div>
    <?php
}

function fourelse_events_connector_allowed_embed_html() {
    $allowed_html = wp_kses_allowed_html('post');

    $allowed_html['script'] = array(
        'src' => true,
        'type' => true,
        'async' => true,
        'defer' => true,
        'charset' => true,
    );

    $allowed_html['iframe'] = array(
        'src' => true,
        'width' => true,
        'height' => true,
        'style' => true,
        'class' => true,
        'id' => true,
        'title' => true,
        'loading' => true,
        'allow' => true,
        'allowfullscreen' => true,
        'frameborder' => true,
        'scrolling' => true,
    );

    return $allowed_html;
}

function fourelse_events_connector_shortcode($atts) {
    $options = get_option(FOURELSE_EVENTS_CONNECTOR_OPTION);
    $code = isset($options['eventeas_code']) ? trim($options['eventeas_code']) : '';
    $fallback = isset($options['fallback_text']) ? $options['fallback_text'] : __('Currently no events are available.', '4else-events-event-teaser-booking-connector');

    if (empty($code)) {
        if (current_user_can('manage_options')) {
            return '<div class="fourelse-events-notice">' . esc_html__('Please add your 4else EvenTeas code under 4else Events first.', '4else-events-event-teaser-booking-connector') . '</div>';
        }

        return '<div class="fourelse-events-empty">' . esc_html($fallback) . '</div>';
    }

    $safe_code = wp_kses($code, fourelse_events_connector_allowed_embed_html(), array('http', 'https'));

    return '<div class="fourelse-events-connector">' . $safe_code . '</div>';
}