/* SPDX-License-Identifier: GPL-2.0-or-later
 * Copyright 2005 Blender Foundation. All rights reserved. */

/** \file
 * \ingroup shdnodes
 */

#include "node_shader_util.hh"

#include "UI_interface.h"
#include "UI_resources.h"

namespace blender::nodes::node_shader_clamp_cc {

static void sh_node_clamp_declare(NodeDeclarationBuilder &b)
{
  b.is_function_node();
  b.add_input<decl::Float>(N_("Value")).default_value(1.0f);
  b.add_input<decl::Float>(N_("Min")).default_value(0.0f).min(-10000.0f).max(10000.0f);
  b.add_input<decl::Float>(N_("Max")).default_value(1.0f).min(-10000.0f).max(10000.0f);
  b.add_output<decl::Float>(N_("Result"));
}

static void node_shader_buts_clamp(uiLayout *layout, bContext * /*C*/, PointerRNA *ptr)
{
  uiItemR(layout, ptr, "clamp_type", UI_ITEM_R_SPLIT_EMPTY_NAME, "", ICON_NONE);
}

static void node_shader_init_clamp(bNodeTree * /*ntree*/, bNode *node)
{
  node->custom1 = NODE_CLAMP_MINMAX; /* clamp type */
}

static int gpu_shader_clamp(GPUMaterial *mat,
                            bNode *node,
                            bNodeExecData * /*execdata*/,
                            GPUNodeStack *in,
                            GPUNodeStack *out)
{
  return (node->custom1 == NODE_CLAMP_MINMAX) ?
             GPU_stack_link(mat, node, "clamp_minmax", in, out) :
             GPU_stack_link(mat, node, "clamp_range", in, out);
}

static void sh_node_clamp_build_multi_function(NodeMultiFunctionBuilder &builder)
{
  static fn::CustomMF_SI_SI_SI_SO<float, float, float, float> minmax_fn{
      "Clamp (Min Max)",
      [](float value, float min, float max) { return std::min(std::max(value, min), max); }};
  static fn::CustomMF_SI_SI_SI_SO<float, float, float, float> range_fn{
      "Clamp (Range)", [](float value, float a, float b) {
        if (a < b) {
          return clamp_f(value, a, b);
        }

        return clamp_f(value, b, a);
      }};

  int clamp_type = builder.node().custom1;
  if (clamp_type == NODE_CLAMP_MINMAX) {
    builder.set_matching_fn(minmax_fn);
  }
  else {
    builder.set_matching_fn(range_fn);
  }
}

}  // namespace blender::nodes::node_shader_clamp_cc

void register_node_type_sh_clamp()
{
  namespace file_ns = blender::nodes::node_shader_clamp_cc;

  static bNodeType ntype;

  sh_fn_node_type_base(&ntype, SH_NODE_CLAMP, "Clamp", NODE_CLASS_CONVERTER);
  ntype.declare = file_ns::sh_node_clamp_declare;
  ntype.draw_buttons = file_ns::node_shader_buts_clamp;
  node_type_init(&ntype, file_ns::node_shader_init_clamp);
  node_type_gpu(&ntype, file_ns::gpu_shader_clamp);
  ntype.build_multi_function = file_ns::sh_node_clamp_build_multi_function;

  nodeRegisterType(&ntype);
}