OneFromOptionsDropRule.cs

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using System.Collections.Generic;
 
namespace Terraria.GameContent.ItemDropRules;
 
public class OneFromOptionsDropRule : IItemDropRule
{
    public int[] dropIds;
 
    public int chanceDenominator;
 
    public int chanceNumerator;
 
    public List<IItemDropRuleChainAttempt> ChainedRules { get; private set; }
 
    public OneFromOptionsDropRule(int chanceDenominator, int chanceNumerator, params int[] options)
    {
        this.chanceDenominator = chanceDenominator;
        this.chanceNumerator = chanceNumerator;
        dropIds = options;
        ChainedRules = new List<IItemDropRuleChainAttempt>();
    }
 
    public bool CanDrop(DropAttemptInfo info)
    {
        return true;
    }
 
    public ItemDropAttemptResult TryDroppingItem(DropAttemptInfo info)
    {
        ItemDropAttemptResult result;
        if (info.player.RollLuck(chanceDenominator) < chanceNumerator)
        {
            CommonCode.DropItemFromNPC(info.npc, dropIds[info.rng.Next(dropIds.Length)], 1);
            result = default(ItemDropAttemptResult);
            result.State = ItemDropAttemptResultState.Success;
            return result;
        }
        result = default(ItemDropAttemptResult);
        result.State = ItemDropAttemptResultState.FailedRandomRoll;
        return result;
    }
 
    public void ReportDroprates(List<DropRateInfo> drops, DropRateInfoChainFeed ratesInfo)
    {
        float num = (float)chanceNumerator / (float)chanceDenominator;
        float num2 = num * ratesInfo.parentDroprateChance;
        float dropRate = 1f / (float)dropIds.Length * num2;
        for (int i = 0; i < dropIds.Length; i++)
        {
            drops.Add(new DropRateInfo(dropIds[i], 1, 1, dropRate, ratesInfo.conditions));
        }
        Chains.ReportDroprates(ChainedRules, num, drops, ratesInfo);
    }
}