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feat(services): CurrencySpendService (central debit primitive, freeplay-aware)

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gamer147
2026-05-29 13:49:36 -04:00
parent b7ee0cdcf8
commit 0052307686
2 changed files with 142 additions and 0 deletions
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51
SVSim.Database/Services/CurrencySpendService.cs Normal file
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using SVSim.Database.Models;
namespace SVSim.Database.Services;
public class CurrencySpendService : ICurrencySpendService
{
private readonly IViewerEntitlements _entitlements;
public CurrencySpendService(IViewerEntitlements entitlements) => _entitlements = entitlements;
public Task<SpendResult> TrySpendAsync(Viewer viewer, SpendCurrency currency, long cost, CancellationToken ct = default)
{
if (cost < 0) cost = 0;
// Freeplay bypass applies only to the three main currencies; SpotPoint always real.
if (_entitlements.IsFreeplay && currency != SpendCurrency.SpotPoint)
{
return Task.FromResult(new SpendResult(
SpendOutcome.Success, _entitlements.EffectiveBalance(viewer, currency)));
}
ulong current = GetBalance(viewer, currency);
if (current < (ulong)cost)
return Task.FromResult(new SpendResult(SpendOutcome.Insufficient, (long)current));
ulong post = current - (ulong)cost;
SetBalance(viewer, currency, post);
return Task.FromResult(new SpendResult(SpendOutcome.Success, (long)post));
}
private static ulong GetBalance(Viewer v, SpendCurrency c) => c switch
{
SpendCurrency.Crystal => v.Currency.Crystals,
SpendCurrency.Rupee => v.Currency.Rupees,
SpendCurrency.RedEther => v.Currency.RedEther,
SpendCurrency.SpotPoint => v.Currency.SpotPoints,
_ => throw new ArgumentOutOfRangeException(nameof(c)),
};
private static void SetBalance(Viewer v, SpendCurrency c, ulong value)
{
switch (c)
{
case SpendCurrency.Crystal: v.Currency.Crystals = value; break;
case SpendCurrency.Rupee: v.Currency.Rupees = value; break;
case SpendCurrency.RedEther: v.Currency.RedEther = value; break;
case SpendCurrency.SpotPoint: v.Currency.SpotPoints = value; break;
default: throw new ArgumentOutOfRangeException(nameof(c));
}
}
}