using System;
using System.Threading.Tasks;
using Comal.Classes;
using InABox.Core;
using InABox.Mobile;

namespace PRS.Mobile
{
    public class RequisitionEditViewModel : MobileViewModel<Requisition, RequisitionShell>
    {
        protected override void DoLoad()
        {
            Task[] tasks = new Task[]
            {
                Task.Run(() => Items.Refresh(true)),
                Task.Run(() => Documents.Refresh(true)),
            };
            Task.WaitAll(tasks);
        }
        
        public RequisitionEditMode Mode { get; set; }
        
        public RequisitionItemModel Items { get; private set; }
        
        public RequisitionDocumentModel Documents { get; private set; }
        
        public override bool IsChanged => Item == null || Item.ID == Guid.Empty || Item.IsChanged();
        
        public bool IsMine => Item?.RequestedByID == App.Data.Me.ID;

        private bool _hideElements;
        public bool HideElements
        {
            get => _hideElements;
            set
            {
                if (value == _hideElements) return;
                _hideElements = value;
                OnPropertyChanged();
            }
        }

        private Filter<T> GetFilter<T>(Filter<T> filter)
        {
            if ((Item?.ID ?? Guid.Empty) == Guid.Empty)
                return new Filter<T>().None();
            return filter;
        }
        
        public RequisitionEditViewModel()
        {
            Mode = RequisitionEditMode.PickStock;
            Items = new RequisitionItemModel(App.Data,
                () => GetFilter(new Filter<RequisitionItem>(x => x.RequisitionLink.ID).IsEqualTo(Item.ID))
            ); 
            
            Documents = new RequisitionDocumentModel(App.Data,
                () => GetFilter(new Filter<RequisitionDocument>(x => x.EntityLink.ID).IsEqualTo(Item.ID))
            );   
            
        }

        public void Save()
        {
            Item.Save("Saved by PRS Mobile");
            OnPropertyChanged(nameof(IsChanged));
        }
        
    }
}