ItemDropResolver.cs

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using System.Collections.Generic;
 
namespace Terraria.GameContent.ItemDropRules;
 
public class ItemDropResolver
{
    private ItemDropDatabase _database;
 
    public ItemDropResolver(ItemDropDatabase database)
    {
        _database = database;
    }
 
    public void TryDropping(DropAttemptInfo info)
    {
        List<IItemDropRule> rulesForNPCID = _database.GetRulesForNPCID(info.npc.netID);
        for (int i = 0; i < rulesForNPCID.Count; i++)
        {
            ResolveRule(rulesForNPCID[i], info);
        }
    }
 
    private ItemDropAttemptResult ResolveRule(IItemDropRule rule, DropAttemptInfo info)
    {
        if (!rule.CanDrop(info))
        {
            ItemDropAttemptResult itemDropAttemptResult = default(ItemDropAttemptResult);
            itemDropAttemptResult.State = ItemDropAttemptResultState.DoesntFillConditions;
            ItemDropAttemptResult itemDropAttemptResult2 = itemDropAttemptResult;
            ResolveRuleChains(rule, info, itemDropAttemptResult2);
            return itemDropAttemptResult2;
        }
        ItemDropAttemptResult itemDropAttemptResult3 = ((!(rule is INestedItemDropRule nestedItemDropRule)) ? rule.TryDroppingItem(info) : nestedItemDropRule.TryDroppingItem(info, ResolveRule));
        ResolveRuleChains(rule, info, itemDropAttemptResult3);
        return itemDropAttemptResult3;
    }
 
    private void ResolveRuleChains(IItemDropRule rule, DropAttemptInfo info, ItemDropAttemptResult parentResult)
    {
        ResolveRuleChains(ref info, ref parentResult, rule.ChainedRules);
    }
 
    private void ResolveRuleChains(ref DropAttemptInfo info, ref ItemDropAttemptResult parentResult, List<IItemDropRuleChainAttempt> ruleChains)
    {
        if (ruleChains == null)
        {
            return;
        }
        for (int i = 0; i < ruleChains.Count; i++)
        {
            IItemDropRuleChainAttempt itemDropRuleChainAttempt = ruleChains[i];
            if (itemDropRuleChainAttempt.CanChainIntoRule(parentResult))
            {
                ResolveRule(itemDropRuleChainAttempt.RuleToChain, info);
            }
        }
    }
}