using System.Linq;
using DryIoc;
using Prism.Events;
using Prism.Regions;

namespace MaterialModernWPF.Service
{
    public class CalculationPackageContainer
    {
        private readonly IRegionManager _regionManager;
        private readonly IResolver _resolver;
        public Package[] CalculationPackages { get; }

        public CalculationPackageContainer(
            IEventAggregator eventAggregator, IRegionManager regionManager,
            IResolver resolver)
        {
            _regionManager = regionManager;
            _resolver = resolver;
            CalculationPackages = resolver.ResolveMany<Package>().ToArray();
            eventAggregator.GetEvent<CalculationPackageSelectionChangedEvent>().Subscribe(SelectionChanged);
        }

        private void SelectionChanged((Package sender, bool isSelected) payload)
        {
            var viewKey = payload.sender.GetType().FullName;
            var region = _regionManager.Regions[Constants.PackagesRegion];
            if (payload.isSelected)
            {
                var view = _resolver.Resolve(payload.sender.CalculationViewType);
                region.Add(view, viewKey);
            }
            else
            {
                var view = region.GetView(viewKey);
                region.Remove(view);
            }
        }
    }
}