using System.Collections.Generic;
using Xunit;

namespace csharpcore
{
    // "Conjured" items degrade in Quality twice as fast as normal items
    public class ConjuredTest
    {
        private readonly List<Item> _items;
        private GildedRose _rose;

        public ConjuredTest()
        {
            _items = new List<Item>();
            _rose =new GildedRose(_items);
        }

        [Theory]
        [InlineData(3, 2, 1)]
        [InlineData(5, 1, 3)]
        [InlineData(5, 0, 1)]
        public void ShouldDecreaseInQualityTwiceAsFastAsNormalItems(int inQuality, int sellInDays, int expectedQuality)
        {
            var item = GenerateItem(inQuality, sellInDays);
            _items.Add(item);

            _rose.UpdateQuality();
            Assert.Equal(sellInDays - 1, item.SellIn);
            Assert.Equal(expectedQuality, item.Quality);
        }

        public Item GenerateItem(int quality, int sellInDays) 
            => new Item {Name = "Conjured Mana Cake", Quality = quality, SellIn = sellInDays};
    }
}