Eloquent query with COALESCE, IF, complex ON clause - php

Question

i'd like to ask, how would you write the following query in Laravel Eloquent?
Please note the COALESCE, IF, and the complex LEFT JOIN ... ON (... AND ...).
SELECT COALESCE(IF(customer_group_id=6, prices.price, NULL), products.price) AS finalPrice, prices.customer_group_id, products.*, product_translations.*
FROM `product_categories`
LEFT JOIN `products` ON `product_categories`.`product_id` = `products`.`id`
LEFT JOIN `product_translations` ON `product_translations`.`product_id` = `products`.`id`
LEFT JOIN `prices`
ON (`products`.`id` = `prices`.`product_id` AND `prices`.`customer_group_id` = 6 )
WHERE `product_translations`.`locale` = 'it'
AND `products`.`online` = 1
AND `products`.`sellable` = 1
AND `category_id` = 22
UPDATE: By far, what i came up with is the following:
ProductCategory::leftjoin('products', 'product_categories.product_id', '=', 'products.id')
->leftJoin('product_translations', 'product_translations.product_id', 'products.id')
->leftJoin('prices', function($join) use($customer_group_id) {
$join->on('products.id', '=', 'prices.product_id')
->on('prices.customer_group_id', '=', DB::raw($customer_group_id));
})
->select(
DB::raw('coalesce(if(customer_group_id='.$customer_group_id.',prices.price,NULL), products.price) AS finalPrice'),
'prices.customer_group_id',
'products.*',
'product_translations.*'
)
->where('product_translations.locale', '=', $locale)
->where('products.online', '=', true)
->where('products.sellable', '=', true)
->where('category_id', '=', $this->id);