Get min max value to range filter from query. New callback is added to the filters

file1.php

<?php

use Jet_Engine\Query_Builder\Manager;


add_filter('jet-smart-filters/post-type/meta-fields-settings', 'custom_register_controls');

function custom_register_controls($fields) {
    $queries = Manager::instance()->get_queries_for_options();

    $insert = array(
        '_source_query' => array(
            'type' => 'select',
            'title' => __('Select Query', 'jet-engine'),
            'value' => '',
            'options' => $queries, 
            'conditions' => array(
                '_filter_type' => 'range',
                '_source_callback' => 'custom_source_callback', 
            ),
        ),
    );

  
    $fields = jet_smart_filters()->utils->array_insert_after($fields, '_source_callback', $insert);

    return $fields;
}

file2.php

<?php

add_filter('jet-smart-filters/filter-instance/args', function ($args) {

	$filter_id = $args['filter_id'];
	$query_var  = get_post_meta($filter_id, '_query_var', true);
	$step = get_post_meta($filter_id, '_source_step', true);
	$source_cb = get_post_meta($filter_id, '_source_callback', true);
	$source_query = get_post_meta($filter_id, '_source_query', true);
	if (!$step) {
		$step = 1;
	}
	if (is_callable($source_cb)) {
		$data = call_user_func($source_cb, array('key' => $query_var . ',' . $source_query));
		$min  = isset($data['min']) ? $data['min'] : false;
		$max  = isset($data['max']) ? max_value_for_current_step($data['max'], $min, $step) : false;
		$args['min'] = $min;
		$args['max'] = $max;
	}
	return $args;
});

function max_value_for_current_step($max, $min, $step){

	if ($step === 1) {
		return $max;
	}

	$steps_count = ceil(($max - $min) / $step);

	return $steps_count * $step + $min;
}

file3.php

<?php

function custom_source_callback($args = array()) {
	if (!function_exists('jet_engine')) {
        return $callbacks;
    }
	
    global $wpdb;

    $key = !empty($args['key']) ? $args['key'] : false;

    if (!$key) {
        return array();
    }

    $key_parts = explode(',', $key);

    if (count($key_parts) !== 2) {
        return array();
    }

    $field = trim($key_parts[0]);
    $query_id = trim($key_parts[1]);

    // Use a macro to get post IDs
    $macro_result = jet_engine()->listings->macros->do_macros('%query_results|' . $query_id . '|ids%');
    
    if (is_string($macro_result)) {
        $post_ids = explode(',', $macro_result);
    } else {
        $post_ids = $macro_result;
    }

    $post_id_condition = '';
    if (!empty($post_ids)) {
        $post_id_condition = " AND p.ID IN (" . implode(',', $post_ids) . ")";
    }

    $sql = "SELECT min(FLOOR(pm.meta_value)) as min, max(CEILING(pm.meta_value)) as max
            FROM $wpdb->postmeta AS pm
            INNER JOIN $wpdb->posts AS p ON p.ID = pm.post_id
            WHERE pm.meta_key IN ('" . str_replace(',', '\',\'', str_replace(' ', '', $field)) . "')" . $post_id_condition;

    $data = $wpdb->get_results($sql, ARRAY_A);

    if (!empty($data)) {
        return $data[0];
    } else {
        return array();
    }
}

add_filter('jet-smart-filters/range/source-callbacks', function ($callbacks) {
	if (!function_exists('jet_engine')) {
		return $callbacks;
	}
	$callbacks['custom_source_callback'] = __('Get from JetEngine Query', 'jet-smart-filters');
	return $callbacks;
});