Radicade/Server/Storefront/PurchaseAPI.cs

using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using RadicadeServer.API.Notifications;
using RadicadeServer.DB;
using RadicadeServer.Extensions;
using RadicadeServer.RecNet.Enums.Messages;
using RadicadeServer.RecNet.Accounts;
using RadicadeServer.RecNet.Auth;
using RadicadeServer.RecNet.Enums.Store;
using RadicadeServer.RecNet.Notifications;
using RadicadeServer.RecNet.Responses;
using RadicadeServer.RecNet.Storefront;

namespace RadicadeServer.API.Storefront
{
	[Route("api/storefronts/")]
	[Route("econ/api/storefronts/")]
    public class PurchaseAPI(RecDBContext _db) : Controller
    {
        [HttpPost("v1/buyItem"), Authorize]
        public async Task<IActionResult> BuyItem([FromBody] RequestPurchaseItemDTO? request)
            => await ProcessPurchase(request);

        [HttpPost("v1/buyTier"), Authorize]
        public async Task<IActionResult> BuyTier([FromBody] RequestPurchaseItemDTO? request)
            => await ProcessPurchase(request);

        [HttpPost("v1/buyElite"), Authorize]
        public async Task<IActionResult> BuyElite([FromBody] RequestPurchaseItemDTO? request)
            => await ProcessPurchase(request);

        [HttpGet("v2/buyInvention"), Authorize]
        public async Task<IActionResult> BuyInvention([FromQuery] long inventionId, [FromQuery] long requestedPrice)
            => await ProcessInventionPurchase(inventionId, requestedPrice);

        private async Task<IActionResult> ProcessPurchase(RequestPurchaseItemDTO? request)
        {
            var userId = User.GetUserId();
            if (userId == null) return Unauthorized();

            if (request == null)
            {
                return BadRequest(new { error = "invalid_request" });
            }

            var outcome = await StorefrontShared.ExecutePurchaseAsync(
                _db,
                userId.Value,
                request.StorefrontType,
                request.PurchasableItemId,
                request.CurrencyType,
                request.RequestedPrice,
                request.Gift);

            if (outcome.Response != null)
                return Ok(outcome.Response);
            return outcome.Error switch
            {
                "cannot_gift_self" or "invalid_recipient" => BadRequest(new { error = outcome.Error, message = outcome.ErrorDetail }),
                _ => StatusCode(StatusCodes.Status500InternalServerError, new { error = outcome.Error, message = outcome.ErrorDetail })
            };
        }

        private async Task<IActionResult> ProcessInventionPurchase(long inventionId, long requestedPrice)
		{
			var userId = User.GetUserId();
			if (userId == null) return Unauthorized();

			var invention = await _db.Inventions.FirstOrDefaultAsync(x => x.InventionId == inventionId);
			if (invention == null) return NotFound();

			var currency = await _db.Currency.FirstOrDefaultAsync(x => x.AccountId == userId);
			if (currency == null) return NotFound();

			var unlocks = await _db.Unlocks.FirstOrDefaultAsync(x => x.AccountId == userId);
			if (unlocks == null)
			{
				unlocks = new PlayerUnlocks { AccountId = userId.Value };
				await _db.Unlocks.AddAsync(unlocks);
			}

			var owned = ReadOwnedInventions(unlocks);
			if (owned.Contains(inventionId)) return Ok(new Success(false, "Invention is already owned.", null));

			var price = invention.Price ?? 0;
			if (requestedPrice != price)
			{
				return Ok(new Success(false, "Invalid requested price.", null));
			}

            var (balance, delta, sufficient) = TryDeductCurrency(currency, CurrencyType.RecCenterTokens, price);

            if (!sufficient)
            {
                return Ok(new Success(false, "You do not have enough tokens for this invention.", null));
            }

            owned.Add(inventionId);
            unlocks.Inventions = owned.ToJson();

			await _db.SaveChangesAsync();

			var response = new InventionPurchaseResponseDTO.BalanceResponse
			{
				Balance = balance,
				BalanceAddType = StorefrontBalanceAddTypes.CommercePurchase,
				CurrencyType = CurrencyType.RecCenterTokens,
				Delta = delta,
				Result = new List<InventionPurchaseResponseDTO.BalanceResponse.InventionData>
				{
					new InventionPurchaseResponseDTO.BalanceResponse.InventionData{ Invention = invention.ToInvention(), Status = PurchaseStatus.OK }
				}
			};
            var purchased = new InventionPurchaseResponseDTO
            {
                InventionResponse = invention.ToInvention(),
                BalanceUpdateResponse = response
            };

			await Notify.SendNotify((long)userId, new Notification { Id = NotificationType.StorefrontBalancePurchase, Msg = purchased });
			await Notify.SendNotify((long)userId, new Notification { Id = NotificationType.StorefrontBalanceUpdate, Msg = response });

			var buyerProfile = await _db.Profiles.AsNoTracking().FirstOrDefaultAsync(x => x.accountId == userId);
			if (buyerProfile != null)
				await Notify.SendNotify((long)userId, new Notification { Id = NotificationType.RefreshLogin, Msg = buyerProfile });

			return Ok(new Success(true, null, purchased));
        }

        private static List<long> ReadOwnedInventions(PlayerUnlocks unlocks)
        {
            if (string.IsNullOrWhiteSpace(unlocks.Inventions) || unlocks.Inventions == "null")
                return new List<long>();

            try
            {
                return unlocks.Inventions.FromJson<List<long>>() ?? new List<long>();
            }
            catch
            {
                return new List<long>();
            }
        }

        private static (long balance, long delta, bool sufficient) TryDeductCurrency(
            RecNet.Accounts.Currency currency, CurrencyType type, long cost)
        {			long balance = type switch
            {
                CurrencyType.RecCenterTokens => currency.RecTokens,
                CurrencyType.LaserTagTickets => currency.LaserTagTickets,
                CurrencyType.LostSkullsGold  => currency.Gold,
                CurrencyType.DraculaSilver   => currency.DraculaSilver,
                _                            => 0
            };

            if (balance < cost) return (balance, 0, false);

            switch (type)
            {
                case CurrencyType.RecCenterTokens: currency.RecTokens -= cost; break;
                case CurrencyType.LaserTagTickets: currency.LaserTagTickets -= cost; break;
                case CurrencyType.LostSkullsGold:  currency.Gold -= cost; break;
                case CurrencyType.DraculaSilver:   currency.DraculaSilver -= cost; break;
            }

            return (balance - cost, cost, true);
        }
    }
}