// 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.

namespace Connected.Components;

/// <summary>
/// A section (nav link) inside the MudPageContentNavigation
/// </summary>
public class PageContentSection
{
   private List<PageContentSection> _children = new();
   public int LevelSortingValue { get; private set; } = 0;
   public PageContentSection Parent { get; private set; } = null;

   /// <summary>
   /// create a new instance with a title and id and level set to zero
   /// </summary>
   /// <param name="title">name of the section will be displayed in the navigation</param>
   /// <param name="id">id of the section. It will be appending to the current url, if the section becomes active</param>
   public PageContentSection(string title, string id) : this(title, id, 0, null)
   {
   }

   /// <summary>
   /// create a new instance with a title and id and level
   /// </summary>
   /// <param name="title">name of the section will be displayed in the navigation</param>
   /// <param name="id">id of the section. It will be appending to the current url, if the section becomes active</param>
   /// <param name="level">The level within the hierachy</param>
   /// <param name="parent">The parent of the section. null if there is no parent or no hierachy</param>
   public PageContentSection(string title, string id, int level, PageContentSection parent)
   {
      Title = title;
      Id = id;
      Level = level;
      Parent = parent;
      if (Parent != null)
      {
         Parent._children.Add(this);
      }
   }

   public int Level { get; set; }

   /// <summary>
   /// The Title of the section. This will be displayed in the navigation
   /// </summary>
   public string Title { get; set; }

   /// <summary>
   /// Id of the section. It will be appending to the current url, if the section becomes active
   /// </summary>
   public string Id { get; set; }

   /// <summary>
   /// Indicating if the section is currently in the middle of the viewport
   /// </summary>
   public bool IsActive { get; private set; }

   protected internal void Activate() => IsActive = true;
   protected internal void Deactive() => IsActive = false;

   internal void SetLevelStructure(int counter, int diff)
   {
      LevelSortingValue = counter;
      int levelDiff = diff / 10;
      int value = counter + levelDiff;
      foreach (var item in _children)
      {
         item.SetLevelStructure(value, levelDiff);
         value += levelDiff;
      }
   }
}