using Microsoft.Extensions.DependencyInjection;
using Toolkit.Foundation;

namespace Bitvault;

public class ModifiedItemHandler(IServiceProvider serviceProvider,
    ICache<Item> cache,
    IPublisher publisher) :
    INotificationHandler<ModifiedEventArgs<Item>>
{
    public Task Handle(ModifiedEventArgs<Item> args)
    {
        Item oldItem = args.OldView;
        Item newItem = args.NewValue;

        if (cache.TryGetValue(oldItem, out Item? cachedItem))
        {
            if (cachedItem is not null)
            {
                IServiceScope serviceScope = serviceProvider.CreateScope();
                IServiceFactory serviceFactory = serviceScope.ServiceProvider.GetRequiredService<IServiceFactory>();
                IValueStore<Item> valueStore = serviceScope.ServiceProvider.GetRequiredService<IValueStore<Item>>();

                if (serviceFactory.Create<ItemNavigationViewModel>(newItem.Id, newItem.Name, "Description", true)
                    is ItemNavigationViewModel viewModel)
                {
                    int oldIndex = cache.IndexOf(cachedItem);
                    cache.Remove(cachedItem);

                    cache.Add(newItem);

                    int newIndex = cache.IndexOf(newItem);
                    valueStore.Set(newItem);

                    publisher.Publish(RemoveAndInsertAt.As(oldIndex, newIndex, viewModel), nameof(ContainerViewModel));
                }
            }
        }

        return Task.CompletedTask;
    }
}