OneFromRulesRule.cs

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using System.Collections.Generic;
 
namespace Terraria.GameContent.ItemDropRules;
 
public class OneFromRulesRule : IItemDropRule, INestedItemDropRule
{
    public IItemDropRule[] options;
 
    public int chanceDenominator;
 
    public List<IItemDropRuleChainAttempt> ChainedRules { get; private set; }
 
    public OneFromRulesRule(int chanceDenominator, params IItemDropRule[] options)
    {
        this.chanceDenominator = chanceDenominator;
        this.options = options;
        ChainedRules = new List<IItemDropRuleChainAttempt>();
    }
 
    public bool CanDrop(DropAttemptInfo info)
    {
        return true;
    }
 
    public ItemDropAttemptResult TryDroppingItem(DropAttemptInfo info)
    {
        ItemDropAttemptResult result = default(ItemDropAttemptResult);
        result.State = ItemDropAttemptResultState.DidNotRunCode;
        return result;
    }
 
    public ItemDropAttemptResult TryDroppingItem(DropAttemptInfo info, ItemDropRuleResolveAction resolveAction)
    {
        int num = -1;
        ItemDropAttemptResult result;
        if (info.rng.Next(chanceDenominator) == 0)
        {
            num = info.rng.Next(options.Length);
            resolveAction(options[num], info);
            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 = 1f / (float)chanceDenominator;
        float num2 = num * ratesInfo.parentDroprateChance;
        float multiplier = 1f / (float)options.Length * num2;
        for (int i = 0; i < options.Length; i++)
        {
            options[i].ReportDroprates(drops, ratesInfo.With(multiplier));
        }
        Chains.ReportDroprates(ChainedRules, num, drops, ratesInfo);
    }
}