using System;
using System.Collections.Generic;
using Avalonia.PropertyGrid.Models;

namespace Avalonia.PropertyGrid.Editors;

/// <summary>
/// Registry for custom property editors
/// </summary>
public static class EditorRegistry
{
    private static readonly Dictionary<Type, Type> _typeEditors = new();
    private static readonly Dictionary<string, Type> _propertyEditors = new();

    /// <summary>
    /// Register a custom editor for a specific type
    /// </summary>
    public static void RegisterEditor(Type propertyType, Type editorType)
    {
        if (!typeof(PropertyEditor).IsAssignableFrom(editorType))
        {
            throw new ArgumentException($"Editor type must inherit from PropertyEditor", nameof(editorType));
        }

        _typeEditors[propertyType] = editorType;
    }

    /// <summary>
    /// Register a custom editor for a specific property by name
    /// </summary>
    public static void RegisterEditor(string propertyName, Type editorType)
    {
        if (!typeof(PropertyEditor).IsAssignableFrom(editorType))
        {
            throw new ArgumentException($"Editor type must inherit from PropertyEditor", nameof(editorType));
        }

        _propertyEditors[propertyName] = editorType;
    }

    /// <summary>
    /// Get the editor type for a property item
    /// </summary>
    public static Type? GetEditorType(PropertyItem item)
    {
        // Check for explicit editor type on the item
        if (item.EditorType != null)
        {
            return item.EditorType;
        }

        // Check for property-specific editor
        if (_propertyEditors.TryGetValue(item.Name, out var propertyEditor))
        {
            return propertyEditor;
        }

        // Check for type-specific editor
        if (_typeEditors.TryGetValue(item.PropertyType, out var typeEditor))
        {
            return typeEditor;
        }

        // Return default editor based on type
        return GetDefaultEditorType(item.PropertyType);
    }

    private static Type? GetDefaultEditorType(Type propertyType)
    {
        if (propertyType == typeof(string))
            return typeof(StringEditor);

        if (propertyType == typeof(bool))
            return typeof(BooleanEditor);

        if (propertyType == typeof(int) || propertyType == typeof(long) || 
            propertyType == typeof(short) || propertyType == typeof(byte) ||
            propertyType == typeof(uint) || propertyType == typeof(ulong) ||
            propertyType == typeof(ushort) || propertyType == typeof(sbyte) ||
            propertyType == typeof(float) || propertyType == typeof(double) ||
            propertyType == typeof(decimal))
            return typeof(NumericEditor);

        if (propertyType.IsEnum)
            return typeof(EnumEditor);

        if (propertyType == typeof(DateTime))
            return typeof(DateTimeEditor);

        return null; // Will use default TextBox
    }
}