{#
 # Product Image Gallery (Bootstrap 5 Override)
 #
 # Renders the product image gallery with main image and thumbnail strip.
 #
 # Expected context:
 #   product             - WC_Product object
 #   post_thumbnail_id   - Main image attachment ID
 #   columns             - Number of thumbnail columns
 #   gallery_image_ids   - Array of gallery attachment IDs
 #   main_image_html     - Pre-rendered main image HTML
 #
 # WooCommerce PHP equivalent: single-product/product-image.php
 #
 # @package WcBootstrap
 # @since 0.1.0
 #}

{# Compute image data from the product object (PHP template does this locally). #}
{% set post_thumbnail_id = product.get_image_id() %}
{% set gallery_image_ids = product.get_gallery_image_ids() %}
{% set cols = apply_filters('woocommerce_product_thumbnails_columns', 4) %}
{% set has_images = post_thumbnail_id %}
{% set gallery_classes = 'woocommerce-product-gallery woocommerce-product-gallery--columns-' ~ cols %}
{% if has_images %}
    {% set gallery_classes = gallery_classes ~ ' woocommerce-product-gallery--with-images' %}
{% else %}
    {% set gallery_classes = gallery_classes ~ ' woocommerce-product-gallery--without-images' %}
{% endif %}

<div class="{{ gallery_classes }}" data-columns="{{ cols }}" style="opacity: 0; transition: opacity .25s ease-in-out;">
    <div class="woocommerce-product-gallery__wrapper">
        {# Main product image #}
        {% if post_thumbnail_id %}
            <div class="woocommerce-product-gallery__image mb-3">
                <img src="{{ wp_get_attachment_url(post_thumbnail_id)|esc_url }}"
                     class="img-fluid rounded wp-post-image"
                     alt="{{ product.get_name()|esc_attr }}" />
            </div>
        {% else %}
            <div class="woocommerce-product-gallery__image woocommerce-product-gallery__image--placeholder mb-3">
                <img src="{{ wc_placeholder_img_src()|esc_url }}"
                     class="img-fluid rounded wp-post-image"
                     alt="{{ __('Awaiting product image')|esc_attr }}" />
            </div>
        {% endif %}

        {# Thumbnail gallery strip — includes main image so user can switch back.
           Build a combined list: main image first, then gallery images.
           Skip any IDs that don't resolve to a valid attachment URL. #}
        {% if gallery_image_ids|length > 0 and post_thumbnail_id %}
            {% set all_thumb_ids = [post_thumbnail_id]|merge(gallery_image_ids) %}
            <div class="row row-cols-{{ cols }} g-2 mt-2">
                {% for image_id in all_thumb_ids %}
                    {% set thumb_url = wp_get_attachment_url(image_id) %}
                    {% if thumb_url %}
                        <div class="col">
                            <img src="{{ thumb_url|esc_url }}"
                                 class="img-fluid rounded border wc-gallery-thumb{% if loop.first %} border-primary active{% endif %}"
                                 alt="{{ product.get_name()|esc_attr }}"
                                 data-full-src="{{ thumb_url|esc_url }}"
                                 style="{% if loop.first %}opacity: 1{% else %}opacity: 0.6{% endif %}" />
                        </div>
                    {% endif %}
                {% endfor %}
            </div>
        {% endif %}
    </div>

    {{ do_action('woocommerce_product_thumbnails') }}
</div>