Pdf_carousel

<?php
/**
 * Plugin Name: PDF Carousel
 * Description: A lightweight plugin to display PDFs in a carousel (uses Slick). Includes admin settings for URLs, size, and autoplay.
 * Version: 1.3
 * Author: Nikolay Djemerenov
 */

// Exit if accessed directly
if ( ! defined( 'ABSPATH' ) ) exit;

/**
 * Enqueue Slick Carousel assets
 */
function pdf_carousel_enqueue_scripts() {
    // Slick CSS
    wp_enqueue_style( 'slick-css', 'https://cdn.jsdelivr.net/npm/[email protected]/slick/slick.css' );
    wp_enqueue_style( 'slick-theme-css', 'https://cdn.jsdelivr.net/npm/[email protected]/slick/slick-theme.css' );

    // Slick JS
    wp_enqueue_script( 'slick-js', 'https://cdn.jsdelivr.net/npm/[email protected]/slick/slick.min.js', array('jquery'), null, true );

    // Get options
    $autoplay       = get_option( 'pdf_carousel_autoplay', '1' );
    $autoplay_speed = get_option( 'pdf_carousel_autoplay_speed', '4000' );

    // Init script
    $autoplay_js = ( $autoplay === '1' ) ? 'true' : 'false';
    $speed_js    = intval( $autoplay_speed );

    wp_add_inline_script( 'slick-js', "
        jQuery(document).ready(function($){
            $('.pdf-carousel').slick({
                infinite: true,
                slidesToShow: 1,
                autoplay: $autoplay_js,
                autoplaySpeed: $speed_js,
                arrows: true,
                dots: true
            });
        });
    " );
}
add_action( 'wp_enqueue_scripts', 'pdf_carousel_enqueue_scripts' );

/**
 * Shortcode [pdf_carousel]
 */
function pdf_carousel_shortcode() {
    // Get settings
    $pdfs   = get_option( 'pdf_carousel_urls', '' );
    $width  = get_option( 'pdf_carousel_width', '300' );
    $height = get_option( 'pdf_carousel_height', '400' );

    if ( empty( $pdfs ) ) return '<p>No PDFs added yet.</p>';

    $pdfs = array_map( 'trim', explode( ',', $pdfs ) );

    $output = '<div class="pdf-carousel">';
    foreach ( $pdfs as $pdf ) {
        $output .= '<div><iframe src="' . esc_url( $pdf ) . '" width="' . intval( $width ) . '" height="' . intval( $height ) . '" style="border:none;border-radius:8px;"></iframe></div>';
    }
    $output .= '</div>';

    return $output;
}
add_shortcode( 'pdf_carousel', 'pdf_carousel_shortcode' );

/**
 * Admin Menu
 */
function pdf_carousel_add_admin_menu() {
    add_options_page(
        'PDF Carousel',
        'PDF Carousel',
        'manage_options',
        'pdf-carousel',
        'pdf_carousel_options_page'
    );
}
add_action( 'admin_menu', 'pdf_carousel_add_admin_menu' );

/**
 * Register Settings
 */
function pdf_carousel_settings_init() {
    register_setting( 'pdfCarousel', 'pdf_carousel_urls' );
    register_setting( 'pdfCarousel', 'pdf_carousel_width' );
    register_setting( 'pdfCarousel', 'pdf_carousel_height' );
    register_setting( 'pdfCarousel', 'pdf_carousel_autoplay' );
    register_setting( 'pdfCarousel', 'pdf_carousel_autoplay_speed' );

    add_settings_section(
        'pdf_carousel_section',
        __( 'PDF Carousel Settings', 'pdf-carousel' ),
        function() {
            echo '<p>Enter PDF URLs, size, and carousel behavior.</p>';
        },
        'pdfCarousel'
    );

    add_settings_field(
        'pdf_carousel_urls',
        __( 'PDF URLs', 'pdf-carousel' ),
        'pdf_carousel_urls_render',
        'pdfCarousel',
        'pdf_carousel_section'
    );

    add_settings_field(
        'pdf_carousel_width',
        __( 'PDF Width (px)', 'pdf-carousel' ),
        'pdf_carousel_width_render',
        'pdfCarousel',
        'pdf_carousel_section'
    );

    add_settings_field(
        'pdf_carousel_height',
        __( 'PDF Height (px)', 'pdf-carousel' ),
        'pdf_carousel_height_render',
        'pdfCarousel',
        'pdf_carousel_section'
    );

    add_settings_field(
        'pdf_carousel_autoplay',
        __( 'Autoplay', 'pdf-carousel' ),
        'pdf_carousel_autoplay_render',
        'pdfCarousel',
        'pdf_carousel_section'
    );

    add_settings_field(
        'pdf_carousel_autoplay_speed',
        __( 'Autoplay Speed (ms)', 'pdf-carousel' ),
        'pdf_carousel_autoplay_speed_render',
        'pdfCarousel',
        'pdf_carousel_section'
    );
}
add_action( 'admin_init', 'pdf_carousel_settings_init' );

/**
 * Render Inputs
 */
function pdf_carousel_urls_render() {
    $urls = get_option( 'pdf_carousel_urls', '' );
    ?>
    <textarea name="pdf_carousel_urls" rows="5" cols="60"><?php echo esc_textarea( $urls ); ?></textarea>
    <p class="description">Example: /wp-content/uploads/file1.pdf, /wp-content/uploads/file2.pdf</p>
    <?php
}

function pdf_carousel_width_render() {
    $width = get_option( 'pdf_carousel_width', '300' );
    ?>
    <input type="number" name="pdf_carousel_width" value="<?php echo esc_attr( $width ); ?>" min="100" max="1200"> px
    <?php
}

function pdf_carousel_height_render() {
    $height = get_option( 'pdf_carousel_height', '400' );
    ?>
    <input type="number" name="pdf_carousel_height" value="<?php echo esc_attr( $height ); ?>" min="100" max="2000"> px
    <?php
}

function pdf_carousel_autoplay_render() {
    $autoplay = get_option( 'pdf_carousel_autoplay', '1' );
    ?>
    <select name="pdf_carousel_autoplay">
        <option value="1" <?php selected( $autoplay, '1' ); ?>>Enabled</option>
        <option value="0" <?php selected( $autoplay, '0' ); ?>>Disabled</option>
    </select>
    <?php
}

function pdf_carousel_autoplay_speed_render() {
    $speed = get_option( 'pdf_carousel_autoplay_speed', '4000' );
    ?>
    <input type="number" name="pdf_carousel_autoplay_speed" value="<?php echo esc_attr( $speed ); ?>" min="1000" step="500"> ms
    <p class="description">Default: 4000 ms (4 seconds)</p>
    <?php
}

/**
 * Options Page
 */
function pdf_carousel_options_page() {
    ?>
    <div class="wrap">
        <h1>PDF Carousel</h1>
        <form action="options.php" method="post">
            <?php
            settings_fields( 'pdfCarousel' );
            do_settings_sections( 'pdfCarousel' );
            submit_button();
            ?>
        </form>
    </div>
    <?php
}