using System;
using System.Runtime.InteropServices;

namespace ReFuel.Stb.Native
{
    /// <summary>
    /// Procedure to STBI image write function.
    /// </summary>
    /// <param name="context">User provided context pointer.</param>
    /// <param name="data">C Array of data to write.</param>
    /// <param name="size">Size of the C array in bytes.</param>
    [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
    public unsafe delegate void StbiWriteProc(void* context, void* data, int size);

    public unsafe partial class Stbi
    {
        private static readonly int* _tga_with_rle_ptr;
        private static readonly int* _png_compression_level_ptr;
        private static readonly int* _force_png_filter_ptr;

        public static int write_tga_with_rle
        {
            get => *_tga_with_rle_ptr;
            set => *_tga_with_rle_ptr = value;
        }

        public static int write_png_compression_level
        {
            get => *_png_compression_level_ptr;
            set => *_png_compression_level_ptr = value;
        }

        public static int write_force_png_filter
        {
            get => *_force_png_filter_ptr;
            set => *_force_png_filter_ptr = value;
        }

        [DllImport("stbi", CallingConvention = CallingConvention.Cdecl, EntryPoint = "stbi_write_png_to_func")]
        public static extern int write_png_to_func(IntPtr func, void* context, int w, int h, int comp, void* data, int stride_in_bytes);

        [DllImport("stbi", CallingConvention = CallingConvention.Cdecl, EntryPoint = "stbi_write_bmp_to_func")]
        public static extern int write_bmp_to_func(IntPtr func, void* context, int w, int h, int comp, void* data);

        [DllImport("stbi", CallingConvention = CallingConvention.Cdecl, EntryPoint = "stbi_write_tga_to_func")]
        public static extern int write_tga_to_func(IntPtr func, void* context, int w, int h, int comp, void* data);

        [DllImport("stbi", CallingConvention = CallingConvention.Cdecl, EntryPoint = "stbi_write_hdr_to_func")]
        public static extern int write_hdr_to_func(IntPtr func, void* context, int w, int h, int comp, void* data);

        [DllImport("stbi", CallingConvention = CallingConvention.Cdecl, EntryPoint = "stbi_write_jpg_to_func")]
        public static extern int write_jpg_to_func(IntPtr func, void* context, int w, int h, int comp, void* data, int quality);

        [DllImport("stbi", CallingConvention = CallingConvention.Cdecl, EntryPoint = "stbi_flip_vertically_on_write")]
        public static extern int flip_vertically_on_write(int value);
    }
}