using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;

namespace Avalonia.PropertyGrid.Models;

/// <summary>
/// Represents a category group in the PropertyGrid
/// </summary>
public class CategoryGroup : INotifyPropertyChanged
{
    private bool _isExpanded = true;

    /// <summary>
    /// Occurs when a property value changes.
    /// </summary>
    public event PropertyChangedEventHandler? PropertyChanged;

    /// <summary>
    /// The category name
    /// </summary>
    public string CategoryName { get; set; } = string.Empty;

    /// <summary>
    /// Properties in this category
    /// </summary>
    public ObservableCollection<PropertyItem> Properties { get; set; } = new();

    /// <summary>
    /// Whether the category is expanded
    /// </summary>
    public bool IsExpanded
    {
        get => _isExpanded;
        set
        {
            if (_isExpanded != value)
            {
                _isExpanded = value;
                OnPropertyChanged(nameof(IsExpanded));
            }
        }
    }

    /// <summary>
    /// Number of properties in this category
    /// </summary>
    public int PropertyCount => Properties.Count;

    /// <summary>
    /// Raises the PropertyChanged event for the specified property.
    /// </summary>
    /// <param name="propertyName">The name of the property that changed.</param>
    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}