// Copyright (c) MudBlazor 2021
// MudBlazor licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System.Diagnostics.CodeAnalysis;

namespace Connected.Components;

public class TableGroupDefinition<[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.PublicParameterlessConstructor)] T>
{
   public TableGroupDefinition()
   {
   }

   public TableGroupDefinition(Func<T, object> selector, TableGroupDefinition<T> innerGroup = null)
   {
      Selector = selector;
      InnerGroup = innerGroup;
   }

   /// <summary>
   /// Gets or Sets the Group Name. It's useful for use on Header, for example.
   /// </summary>
   public string GroupName { get; set; }

   /// <summary>
   /// The selector func to be used on .GroupBy() with LINQ.
   /// </summary>
   public Func<T, object> Selector { get; set; }

   private TableGroupDefinition<T> _innerGroup;
   public TableGroupDefinition<T> InnerGroup
   {
      get => _innerGroup;
      set
      {
         if (_innerGroup != null)
         {
            _innerGroup.Parent = null;
            _innerGroup.Context = null;
         }

         _innerGroup = value;

         if (_innerGroup != null)
         {
            _innerGroup.Parent = this;
            _innerGroup.Indentation = Indentation;
            _innerGroup.Context = Context;
         }
      }
   }

   internal TableGroupDefinition<T> Parent { get; private set; }

   private bool _indentation;
   /// <summary>
   /// Gets or Sets if First Column cell must have Indentation.
   /// It must be set on First grouping level and works recursively.
   /// </summary>
   public bool Indentation
   {
      get => _indentation;
      set
      {
         _indentation = value;
         if (InnerGroup != null)
            InnerGroup.Indentation = value;
      }

   }

   private bool _expandable = false;
   /// <summary>
   /// Gets or Sets is group header can Expand and Collapse its children.
   /// </summary>
   public bool Expandable
   {
      get => _expandable;
      set
      {
         _expandable = value;
         if (_expandable == false)
            Context?.GroupRows.Where(gr => gr.GroupDefinition == this).ToList().ForEach(gr => gr.IsExpanded = IsInitiallyExpanded);
      }
   }

   private bool _isInitiallyExpanded = true;
   /// <summary>
   /// Gets or Sets if expandable group header is collapsed or expanded on initialization.
   /// </summary>
   public bool IsInitiallyExpanded
   {
      get => _isInitiallyExpanded;
      set
      {
         _isInitiallyExpanded = value;
      }

   }

   internal bool IsParentExpandable
   {
      get
      {
         if (Parent?.Expandable ?? false)
            return true;
         else
            return Parent?.IsParentExpandable ?? false;
      }
   }

   internal bool IsThisOrParentExpandable
   {
      get
      {
         if (Expandable)
            return Expandable;
         else
            return Parent?.IsThisOrParentExpandable ?? false;
      }
   }

   internal int Level
   {
      get
      {
         if (Parent == null)
            return 1;
         else
            return Parent.Level + 1;
      }
   }

   private TableContext<T> _context;
   internal TableContext<T> Context
   {
      get => _context;
      set
      {
         _context = value;
         if (_innerGroup != null)
         {
            _innerGroup.Context = _context;
         }

      }
   }

}