Connected.Logistics/Logistics.Stock/Services/StockAggregator.cs

using Connected.Collections.Queues;
using Connected.Middleware;
using Logistics.Types.WarehouseLocations;
using Microsoft.Extensions.Logging;

namespace Logistics.Stock.Services;
internal sealed class StockAggregator : MiddlewareComponent, IQueueClient<PrimaryKeyQueueArgs<long>>
{
	public StockAggregator(ILogger<StockAggregator> logger, IWarehouseLocationService locations, IStockService stock)
	{
		Logger = logger;
		Locations = locations;
		Stock = stock;
	}

	private ILogger<StockAggregator> Logger { get; }
	private IWarehouseLocationService Locations { get; }
	private IStockService Stock { get; }

	public async Task Invoke(IQueueMessage message, PrimaryKeyQueueArgs<long> args)
	{
		if (await Stock.SelectItem(args.Id) is not IStockItem stock)
		{
			Logger.LogWarning("IStockItem not found {id}", args.Id);
			return;
		}

		await Calculate(stock, stock.Location);
	}

	private async Task Calculate(IStockItem stock, int locationId)
	{
		if (await Locations.Select(locationId) is not IWarehouseLocation location)
		{
			Logger.LogWarning("IWarehouseLocation not found {id}", locationId);
			return;
		}

		if (location.Parent is null)
			return;

		var parent = (int)location.Parent;

		var sum = (await Stock.QueryItems(new QueryStockItemsArgs
		{
			Id = stock.Id,
			Location = parent,
			Serial = stock.Serial
		})).Sum(f => f.Quantity);

		await Stock.Update(new UpdateStockArgs
		{
			Location = parent,
			Quantity = sum,
			Serial = stock.Serial
		});

		await Calculate(stock, parent);
	}
}