using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Globalization;
using System.Reflection;

namespace Avalonia.PropertyGrid.Models;

/// <summary>
/// Represents a single property item in the PropertyGrid
/// </summary>
public class PropertyItem : INotifyPropertyChanged
{
    private object? _value;
    private bool _isExpanded;

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

    /// <summary>
    /// The property name displayed in the grid
    /// </summary>
    public string Name { get; set; } = string.Empty;

    /// <summary>
    /// The display name (from DisplayAttribute or DisplayNameAttribute)
    /// </summary>
    public string DisplayName { get; set; } = string.Empty;

    /// <summary>
    /// The property description
    /// </summary>
    public string? Description { get; set; }

    /// <summary>
    /// The category this property belongs to
    /// </summary>
    public string Category { get; set; } = "Misc";

    /// <summary>
    /// The property value
    /// </summary>
    public object? Value
    {
        get => _value;
        set
        {
            if (_value != value)
            {
                _value = value;
                OnPropertyChanged(nameof(Value));
                OnPropertyChanged(nameof(ValueString));
                OnPropertyChanged(nameof(NumericValue));
                OnPropertyChanged(nameof(ColorValue));
                OnPropertyChanged(nameof(BooleanValue));

                // Update the actual object property
                if (PropertyInfo != null && Instance != null)
                {
                    try
                    {
                        PropertyInfo.SetValue(Instance, value);
                    }
                    catch
                    {
                        // Ignore errors during setting
                    }
                }
            }
        }
    }

    /// <summary>
    /// Numeric value for NumericUpDown binding (converts to/from decimal)
    /// </summary>
    public decimal NumericValue
    {
        get
        {
            if (Value == null) return 0;

            try
            {
                return Convert.ToDecimal(Value, CultureInfo.InvariantCulture);
            }
            catch
            {
                return 0;
            }
        }
        set
        {
            try
            {
                // Convert decimal to the actual property type
                object? converted = null;
                if (PropertyType == typeof(int)) converted = (int)value;
                else if (PropertyType == typeof(long)) converted = (long)value;
                else if (PropertyType == typeof(short)) converted = (short)value;
                else if (PropertyType == typeof(byte)) converted = (byte)value;
                else if (PropertyType == typeof(uint)) converted = (uint)value;
                else if (PropertyType == typeof(ulong)) converted = (ulong)value;
                else if (PropertyType == typeof(ushort)) converted = (ushort)value;
                else if (PropertyType == typeof(sbyte)) converted = (sbyte)value;
                else if (PropertyType == typeof(float)) converted = (float)value;
                else if (PropertyType == typeof(double)) converted = (double)value;
                else if (PropertyType == typeof(decimal)) converted = value;

                if (converted != null)
                {
                    Value = converted;
                }
            }
            catch
            {
                // Ignore conversion errors
            }
        }
    }

    /// <summary>
    /// Color value for ColorPicker binding
    /// </summary>
    public Media.Color ColorValue
    {
        get
        {
            if (Value is Media.Color color)
            {
                System.Diagnostics.Debug.WriteLine($"ColorValue getter: returning {color}");
                return color;
            }
            System.Diagnostics.Debug.WriteLine($"ColorValue getter: Value is not Color (is {Value?.GetType().Name ?? "null"}), returning Black");
            return Media.Colors.Black;
        }
        set
        {
            System.Diagnostics.Debug.WriteLine($"ColorValue setter: setting to {value}");
            Value = value;
        }
    }

    /// <summary>
    /// Boolean value for RadioButton binding
    /// </summary>
    public bool BooleanValue
    {
        get
        {
            if (Value is bool boolVal)
            {
                return boolVal;
            }
            return false;
        }
        set
        {
            Value = value;
        }
    }

    /// <summary>
    /// String representation of the value for display
    /// </summary>
    public string ValueString
    {
        get
        {
            if (Value is Media.Color color)
            {
                return $"#{color.A:X2}{color.R:X2}{color.G:X2}{color.B:X2}";
            }
            return Value?.ToString() ?? string.Empty;
        }
        set
        {
            // Try to parse as color if the property type is Color
            if (PropertyType == typeof(Media.Color))
            {
                try
                {
                    var hexString = value?.Trim() ?? "";
                    if (!hexString.StartsWith("#"))
                        hexString = "#" + hexString;

                    Value = Media.Color.Parse(hexString);
                }
                catch
                {
                    // If parsing fails, ignore
                }
            }
            else
            {
                // For other types, try to convert the string to the property type
                try
                {
                    if (!string.IsNullOrEmpty(value))
                    {
                        Value = Convert.ChangeType(value, PropertyType, CultureInfo.InvariantCulture);
                    }
                }
                catch
                {
                    // If conversion fails, ignore
                }
            }
        }
    }

    /// <summary>
    /// The property type
    /// </summary>
    public Type PropertyType { get; set; } = typeof(object);

    /// <summary>
    /// Whether the property is read-only
    /// </summary>
    public bool IsReadOnly { get; set; }

    /// <summary>
    /// Whether the property is browsable (visible)
    /// </summary>
    public bool IsBrowsable { get; set; } = true;

    /// <summary>
    /// Whether the property is expandable (has sub-properties)
    /// </summary>
    public bool IsExpandable { get; set; }

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

    /// <summary>
    /// Child properties (for complex types)
    /// </summary>
    public List<PropertyItem> Children { get; set; } = new();

    /// <summary>
    /// The PropertyInfo reflection object
    /// </summary>
    public PropertyInfo? PropertyInfo { get; set; }

    /// <summary>
    /// The object instance this property belongs to
    /// </summary>
    public object? Instance { get; set; }

    /// <summary>
    /// Custom editor type for this property
    /// </summary>
    public Type? EditorType { get; set; }

    /// <summary>
    /// The indentation level (for nested properties)
    /// </summary>
    public int IndentLevel { get; set; }

    /// <summary>
    /// Custom converter for this property
    /// </summary>
    public TypeConverter? Converter { get; set; }

    /// <summary>
    /// Order/priority for display
    /// </summary>
    public int Order { get; set; }

    /// <summary>
    /// Raises the PropertyChanged event.
    /// </summary>
    protected virtual void OnPropertyChanged(string propertyName)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }

    /// <summary>
    /// Refreshes the value from the source instance
    /// </summary>
    public void RefreshValue()
    {
        if (PropertyInfo != null && Instance != null)
        {
            try
            {
                _value = PropertyInfo.GetValue(Instance);
                OnPropertyChanged(nameof(Value));
                OnPropertyChanged(nameof(ValueString));
            }
            catch
            {
                // Ignore errors during refresh
            }
        }
    }
}