Ananta-ps/Ananta.Server/Ananta.Handlers/Game/GameRouter.Trade.cs

using Ananta.SDK.Rpc;
using Ananta.Server.ClientData.Client4229938;
using Ananta.Server.Protocol.Client4229938;
using Auto = Ananta.Server.RpcTypes.Client4229938.Auto;
using GameMethods = Ananta.Server.RpcTypes.Client4229938.Methods.Game;

namespace Ananta.Server.Handlers.Game;

/// <summary>
/// Trading post for build 4229938 (TradeManager.AskTradeGetMarketList -> 63492557 and
/// TradeManager.AskTradeBuyItem -> 63188959).
///
/// Retail fills the market from other players' sell orders; this server has none, so every row that
/// carries a price is answered with one synthesised bucket at the row's floor price and a fixed depth.
/// That is all the purchase window needs to open up: its CanBuy() requires marketCount > 0, maxCount > 0
/// and price > 0, and the quantity slider's maximum is the summed bucket depth. A single bucket also
/// keeps the total the client shows (price x count, via its own auto-buy walk) equal to what the wallet
/// is charged here.
///
/// The market settles in 寰宇币 (ConsumableConfig.RewardGold / MoneyType.Gold) and the buy reply is a
/// bare uint32 "filled count" that the client turns into the reward popup.
/// </summary>
internal sealed partial class GameRouter
{
    // TradeItemConfig.ItemType: 0 box/consumable, 1 wardrobe piece, 2 fashion suit (order book only),
    // 3 household collectible (painting/statue/valuable).
    private const uint TradeItemTypeBox4229938 = 0;
    private const uint TradeItemTypeFashion4229938 = 1;
    private const uint TradeItemTypeOrder4229938 = 2;
    private const uint TradeItemTypeCollectible4229938 = 3;

    private const uint TradeCurrency4229938 = CurrencyRewardGold4229938;

    /// <summary>Depth of the synthesised bucket; also the quantity slider's maximum in the window.</summary>
    private const uint TradeBucketDepth4229938 = 99;

    [Handler(MethodId.AskTradeGetMarketList, HandlerPacketKind.Invoke)]
    private async Task AskTradeGetMarketList(Connection conn, UxRpcMessage msg)
    {
        var tradeItemId = ReadUInt32At4229938(msg.Body, 0);
        var reply = new GameMethods.TradeMarketList4229938();

        if (EconomyConfigRepository.TryTradeItem(tradeItemId, out var item)
            && item.MarketPrice > 0
            && item.ItemType != TradeItemTypeOrder4229938)
        {
            reply.buckets.Add(new GameMethods.TradeBucketInfo4229938
            {
                BucketId = item.MarketPrice,
                OrderCount = 1,
                Count = TradeBucketDepth4229938,
                MinPrice = item.MarketPrice,
                MaxPrice = item.MarketPrice,
            });

            conn.Log.Info(
                $"[TRADE] market list row={item.Id} tab={item.Tab} type={item.ItemType} " +
                $"price={item.MarketPrice} depth={TradeBucketDepth4229938}");
        }
        else
        {
            // Empty 7-bit list: the window stays on "no listing" instead of failing to parse.
            conn.Log.Warn($"[TRADE] market list has no bucket for row {tradeItemId} (body={Convert.ToHexString(msg.Body)})");
        }

        await conn.ReturnAsync(msg, reply);
    }

    [Handler(MethodId.AskTradeBuyItem, HandlerPacketKind.Invoke)]
    private async Task AskTradeBuyItem(Connection conn, UxRpcMessage msg)
    {
        var state = GetWorldState(msg.Context);
        var tradeItemId = ReadUInt32At4229938(msg.Body, 0);
        var maxPrice = ReadUInt32At4229938(msg.Body, 4);
        var requested = ReadUInt32At4229938(msg.Body, 8);
        var count = Math.Clamp(requested == 0 ? 1u : requested, 1u, TradeBucketDepth4229938);

        if (!EconomyConfigRepository.TryTradeItem(tradeItemId, out var item)
            || item.MarketPrice == 0
            || item.ItemType == TradeItemTypeOrder4229938)
        {
            conn.Log.Warn($"[TRADE] buy rejected: row {tradeItemId} is not a market row (body={Convert.ToHexString(msg.Body)})");
            await conn.ReturnAsync(msg, 0u);
            return;
        }

        var fashions = new List<uint>();
        var changes = new EconomyChanges4229938();
        var granted = GrantTradePurchase4229938(conn, changes, fashions, item, count);
        if (granted == 0)
        {
            await conn.ReturnAsync(msg, 0u);
            return;
        }

        var unitPrice = maxPrice > 0 ? maxPrice : item.MarketPrice;
        ChargeCurrency4229938(
            state, changes, TradeCurrency4229938, (double)unitPrice * count, conn.Log, $"trade {item.Id}");

        var summary = await ApplyEconomy4229938Async(conn, state, changes, $"trade {item.Id}");

        // Wardrobe pieces are ownership, not a stack, so they arrive as a fashion unlock push.
        foreach (var fashionId in fashions)
        {
            await conn.NotifyAsync(MethodId.IGameToClient_SyncAddOrUpdateFashion, new Auto.FashionInfo
            {
                FashionId = fashionId,
                ExpiredTime = 0,
                GainTime = 1,
                Status = 0,
                ApplyColoringSchemeId = 0,
                UnlockColoringSlotCount = 0,
                ColoringSchemeTopNMaxCollectionScore = 0,
            });
        }

        conn.Log.Info(
            $"[TRADE] buy row={item.Id} tab={item.Tab} type={item.ItemType} count={count} " +
            $"unitPrice={unitPrice} granted={granted} unlockedFashions={fashions.Count} " +
            $"currency={TradeCurrency4229938} -> {summary}");

        await conn.ReturnAsync(msg, granted);
    }

    /// <summary>
    /// Queues what the row sells and returns how many units the client should show as bought.
    /// Item rows land in the backpack delta, fashion rows in the unlock list, and rows with nothing to
    /// hand out (the fashion-suit order rows) report zero so the caller charges nothing.
    /// </summary>
    private static uint GrantTradePurchase4229938(
        Connection conn,
        EconomyChanges4229938 changes,
        List<uint> fashions,
        EconomyConfigRepository.TradeItem item,
        uint count)
    {
        switch (item.ItemType)
        {
            case TradeItemTypeBox4229938:
            case TradeItemTypeCollectible4229938:
                if (item.ItemId == 0)
                    break;

                AddGrant4229938(changes, item.ItemId, count, isBind: false);
                return count;

            case TradeItemTypeFashion4229938:
                if (item.FashionId == 0)
                    break;

                fashions.Add(item.FashionId);
                return count;
        }

        conn.Log.Warn(
            $"[TRADE] row {item.Id} (type={item.ItemType} item={item.ItemId} fashion={item.FashionId} " +
            $"suit={item.FashionSuitId}) has nothing to grant");
        return 0;
    }

    private static uint ReadUInt32At4229938(byte[] body, int offset)
        => body.Length >= offset + 4 ? BitConverter.ToUInt32(body, offset) : 0u;
}