How to override the category template on the /shop/ page when showing filtered products? - woocommerce

Question

I already created a function that will filter products using URL parameters and display them on the /shop/ page. That works fine.
But, that only works if the products template is set on the WooCommerce /shop/ page.
In my case the requirement is to have the category list set as default template on the /shop/ page. That means I need to override that template and show the filtered product list, when I run a product query with URL parameters.
(eg. example.com/shop/?param1=foo&param2=bar)
I tried following code (and some iterations), but I'm stuck and have no clue how to override the default template when a product filter is applied:
add_filter( 'woocommerce_locate_template', [$this, 'my_include_template_function'], 10, 3 );
public function my_change_template_function($template, $template_name, $template_path)
{
if (!empty($_GET['param1']) && is_shop() && $template_name == 'content-product_cat.php') {
return wc_get_template_part('content', 'product');
} else {
return $template;
}
}

Answer 1

So the source of the categories loop is added in to the loop start [via a filter][1]
add_filter( 'woocommerce_product_loop_start', 'woocommerce_maybe_show_product_subcategories' );
and the woocommerce_maybe_short_product_subcategories() function changes the output based on the:
$display_type = woocommerce_get_loop_display_mode();
However, the woocommerce_get_loop_display_mode() result isn't filterable directly.
But it relies on some values from get_option() (since the setting is in the customizer) and get_option() is filterable via option_$option
So a potential way to tell WooCommerce not to display the categories when you have a particular $_GET parameter, you could filter the shop display mode option to be products when that parameter is detected in the URL. Like this:
/**
* Filter shop display type.
*
* #param string $value - 'products' | 'subcategories' | 'both'
* #return string
*/
function kia_woocommerce_shop_page_display( $value ) {
if ( ! empty( $_GET['param1'] ) {
$value = 'products';
}
return $value;
}
add_filter( 'option_woocommerce_shop_page_display', 'kia_woocommerce_shop_page_display' );