Gilded Rose Kotlin refactor Kata

GildedRose.kt

package com.gildedrose

class GildedRose(var items: Array<Item>) {
    fun updateQuality() = items.map { item ->
        when {
            item.name.contains("Sulfuras") -> item.apply { sellIn++ }
            item.name.contains("Brie") -> item.apply {
                quality = minOf(50, when {
                    sellIn > 0 -> quality + 1
                    else -> quality + 2
                })
            }
            item.name.contains("Backstage") -> item.apply {
                quality = minOf(50, when {
                    sellIn > 10 -> quality + 1
                    sellIn > 5 -> quality + 2
                    sellIn > 0 -> quality + 3
                    else -> 0
                })
            }
            item.name.contains("Conjured") -> item.apply {
                quality = maxOf(0, when {
                    sellIn >= 0 -> quality - 2
                    else -> quality - 4
                })
            }
            else -> item.apply {
                quality = maxOf(0, when {
                    sellIn >= 0 -> quality - 1
                    else -> quality - 2
                })
            }
        }.apply { sellIn-- }
    }
}