Connected.Logistics/Connected.Logistics.Processes.Receive/Listeners/PostingItemListener.cs

using Connected.Logistics.Documents.Receive;
using Connected.Logistics.Stock;
using Connected.Logistics.Types.Serials;
using Connected.Middleware.Annotations;
using Connected.Notifications;
using Connected.Notifications.Events;
using Microsoft.Extensions.Logging;

namespace Connected.Logistics.Documents.Listeners;
/// <summary>
/// Represents the event listener to the <see cref="IReceivePostingDocumentService"/> Updated event. 
/// </summary>
/// <remarks>
/// This middleware reacts when the item is inserted and updates the <see cref="IStockItem"/>.
/// </remarks>
[Middleware<IReceivePostingDocumentService>(nameof(IReceivePostingDocumentService.ItemInserted))]
internal sealed class PostingItemListener : EventListener<PrimaryKeyEventArgs<long>>
{
	/// <summary>
	/// Creates a new instance of the <see cref="PostingItemListener"/>
	/// </summary>
	public PostingItemListener(ILogger<PostingItemListener> logger, IStockService stock, IReceivePostingDocumentService documents, ISerialService serials)
	{
		Logger = logger;
		Stock = stock;
		Documents = documents;
		Serials = serials;
	}

	private ILogger<PostingItemListener> Logger { get; }
	private IStockService Stock { get; }
	private IReceivePostingDocumentService Documents { get; }
	private ISerialService Serials { get; }

	protected override async Task OnInvoke()
	{
		/*
		 * Stage 1 is to prepare all data neede to perform operation
		 * 
		 * Load posting item
		 */
		if (await Documents.SelectItem(Arguments.Id) is not IReceivePostingItem item)
		{
			Logger.LogWarning("The IReceivePostingItem not found ({id}}.", Arguments.Id);
			return;
		}
		/*
		 * Now load the serial number
		 */
		if (await Serials.Select(item.Serial) is not ISerial serial)
		{
			Logger.LogWarning("The ISerial not found ({id}}.", item.Serial);
			return;
		}
		/*
		 * Now load the serial number
		 */
		if (await Documents.SelectPlannedItem(new SelectReceivePlannedItemArgs
		{
			Document = item.Document,
			Entity = serial.Entity,
			EntityId = serial.EntityId
		}) is not ISerial plannedItem)
		{
			Logger.LogWarning("The IReceivePlannedItem not found ({entity}, {entityId}).", serial.Entity, serial.EntityId);
			return;
		}
		/*
		 * The idea here is simple:
		 * update (increase) the stock for the specified item 
		 * and posted quantity and update the statictics for
		 * the immediate parents.
		 */
		await Stock.Update(new UpdateStockArgs
		{
			Location = item.Location,
			Quantity = item.Quantity,
			Serial = item.Serial
		});
		/*
		 * Now update the planned item with posted quantity
		 */
		await Documents.UpdatePlannedItem(new UpdateReceivePlannedItemArgs
		{
			Id = plannedItem.Id,
			PostedQuantity = item.Quantity
		});
	}
}