// Copyright (c) 2010-2014 SharpDX - Alexandre Mutel
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

using System;
using System.Globalization;
using System.Runtime.InteropServices;

namespace SharpGen.Runtime;

/// <summary>
/// FunctionCallback
/// </summary>
[StructLayout(LayoutKind.Sequential)]
public class FunctionCallback
{
    public IntPtr Pointer;

    public FunctionCallback(IntPtr pointer)
    {
        Pointer = pointer;
    }

    public unsafe FunctionCallback(void* pointer)
    {
        Pointer = new IntPtr(pointer);
    }

    public static explicit operator IntPtr(FunctionCallback value)
    {
        return value.Pointer;
    }

    public static implicit operator FunctionCallback(IntPtr value)
    {
        return new FunctionCallback(value);
    }

    public unsafe static implicit operator void*(FunctionCallback value)
    {
        return (void*)value.Pointer;
    }

    public static unsafe explicit operator FunctionCallback(void* value)
    {
        return new FunctionCallback(value);
    }

    /// <summary>
    ///   Returns a <see cref = "System.String" /> that represents this instance.
    /// </summary>
    /// <returns>
    ///   A <see cref = "System.String" /> that represents this instance.
    /// </returns>
    public override string ToString()
    {
        return string.Format(CultureInfo.CurrentCulture, "{0}", Pointer);
    }

    /// <summary>
    ///   Returns a <see cref = "System.String" /> that represents this instance.
    /// </summary>
    /// <param name = "format">The format.</param>
    /// <returns>
    ///   A <see cref = "System.String" /> that represents this instance.
    /// </returns>
    public string ToString(string format)
    {
        if (format == null)
            return ToString();

        return string.Format(CultureInfo.CurrentCulture, "{0}", Pointer.ToString(format));
    }

    /// <summary>
    ///   Returns a hash code for this instance.
    /// </summary>
    /// <returns>
    ///   A hash code for this instance, suitable for use in hashing algorithms and data structures like a hash table. 
    /// </returns>
    public override int GetHashCode()
    {
        return Pointer.ToInt32();
    }

    /// <summary>
    ///   Determines whether the specified <see cref = "FunctionCallback" /> is equal to this instance.
    /// </summary>
    /// <param name = "other">The <see cref = "FunctionCallback" /> to compare with this instance.</param>
    /// <returns>
    ///   <c>true</c> if the specified <see cref = "FunctionCallback" /> is equal to this instance; otherwise, <c>false</c>.
    /// </returns>
    public bool Equals(FunctionCallback other)
    {
        return Pointer == other.Pointer;
    }

    /// <summary>
    ///   Determines whether the specified <see cref = "System.Object" /> is equal to this instance.
    /// </summary>
    /// <param name = "value">The <see cref = "System.Object" /> to compare with this instance.</param>
    /// <returns>
    ///   <c>true</c> if the specified <see cref = "System.Object" /> is equal to this instance; otherwise, <c>false</c>.
    /// </returns>
    public override bool Equals(object value)
    {
        if (value == null)
            return false;

        if (!ReferenceEquals(value.GetType(), typeof(FunctionCallback)))
            return false;

        return Equals((FunctionCallback)value);
    }
}