/**
 * Copyright(c) Live2D Inc. All rights reserved.
 *
 * Use of this source code is governed by the Live2D Open Software license
 * that can be found at https://www.live2d.com/eula/live2d-open-software-license-agreement_en.html.
 */


using Live2D.Cubism.Core;
using Live2D.Cubism.Rendering;
using UnityEngine;


namespace Live2D.Cubism.Framework.Json
{
    /// <summary>
    /// Default pickers.
    /// </summary>
    public static class CubismBuiltinPickers
    {
        /// <summary>
        /// Builtin <see cref="Material"/> picker.
        /// </summary>
        /// <param name="sender">Event source.</param>
        /// <param name="drawable">Drawable to map to.</param>
        /// <returns>Mapped texture.</returns>
        public static Material MaterialPicker(CubismModel3Json sender, CubismDrawable drawable)
        {
            if (drawable.IsDoubleSided)
            {
                if (drawable.BlendAdditive)
                {
                    return (drawable.IsMasked)
                        ? (drawable.IsInverted) ? CubismBuiltinMaterials.UnlitAdditiveMaskedInverted :
                        CubismBuiltinMaterials.UnlitAdditiveMasked
                        : CubismBuiltinMaterials.UnlitAdditive;
                }


                if (drawable.MultiplyBlend)
                {
                    return (drawable.IsMasked)
                        ? (drawable.IsInverted) ? CubismBuiltinMaterials.UnlitMultiplyMaskedInverted :
                        CubismBuiltinMaterials.UnlitMultiplyMasked
                        : CubismBuiltinMaterials.UnlitMultiply;
                }


                return (drawable.IsMasked)
                    ? (drawable.IsInverted) ? CubismBuiltinMaterials.UnlitMaskedInverted :
                    CubismBuiltinMaterials.UnlitMasked
                    : CubismBuiltinMaterials.Unlit;
            }

            if (drawable.BlendAdditive)
            {
                return (drawable.IsMasked)
                    ? (drawable.IsInverted) ? CubismBuiltinMaterials.UnlitAdditiveMaskedInvertedCulling :
                    CubismBuiltinMaterials.UnlitAdditiveMaskedCulling
                    : CubismBuiltinMaterials.UnlitAdditiveCulling;
            }


            if (drawable.MultiplyBlend)
            {
                return (drawable.IsMasked)
                    ? (drawable.IsInverted) ? CubismBuiltinMaterials.UnlitMultiplyMaskedInvertedCulling :
                    CubismBuiltinMaterials.UnlitMultiplyMaskedCulling
                    : CubismBuiltinMaterials.UnlitMultiplyCulling;
            }


            return (drawable.IsMasked)
                ? (drawable.IsInverted) ? CubismBuiltinMaterials.UnlitMaskedInvertedCulling :
                CubismBuiltinMaterials.UnlitMaskedCulling
                : CubismBuiltinMaterials.UnlitCulling;
        }


        /// <summary>
        /// Builtin <see cref="Texture2D"/> picker.
        /// </summary>
        /// <param name="sender">Event source.</param>
        /// <param name="drawable">Drawable to map to.</param>
        /// <returns>Mapped texture.</returns>
        public static Texture2D TexturePicker(CubismModel3Json sender, CubismDrawable drawable)
        {
            return sender.Textures[drawable.TextureIndex];
        }
    }
}