/*
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2005 Blender Foundation.
 * All rights reserved.
 */

#include "BLI_noise.h"

#include "../node_shader_util.h"

/* **************** NOISE ******************** */

static bNodeSocketTemplate sh_node_tex_noise_in[] = {
    {SOCK_VECTOR, N_("Vector"), 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, PROP_NONE, SOCK_HIDE_VALUE},
    {SOCK_FLOAT, N_("W"), 0.0f, 0.0f, 0.0f, 0.0f, -1000.0f, 1000.0f},
    {SOCK_FLOAT, N_("Scale"), 5.0f, 0.0f, 0.0f, 0.0f, -1000.0f, 1000.0f},
    {SOCK_FLOAT, N_("Detail"), 2.0f, 0.0f, 0.0f, 0.0f, 0.0f, 16.0f},
    {SOCK_FLOAT, N_("Roughness"), 0.5f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, PROP_FACTOR},
    {SOCK_FLOAT, N_("Distortion"), 0.0f, 0.0f, 0.0f, 0.0f, -1000.0f, 1000.0f},
    {-1, ""},
};

static bNodeSocketTemplate sh_node_tex_noise_out[] = {
    {SOCK_FLOAT,
     N_("Fac"),
     0.0f,
     0.0f,
     0.0f,
     0.0f,
     0.0f,
     1.0f,
     PROP_FACTOR,
     SOCK_NO_INTERNAL_LINK},
    {SOCK_RGBA, N_("Color"), 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, PROP_NONE, SOCK_NO_INTERNAL_LINK},
    {-1, ""},
};

static void node_shader_init_tex_noise(bNodeTree *UNUSED(ntree), bNode *node)
{
  NodeTexNoise *tex = (NodeTexNoise *)MEM_callocN(sizeof(NodeTexNoise), "NodeTexNoise");
  BKE_texture_mapping_default(&tex->base.tex_mapping, TEXMAP_TYPE_POINT);
  BKE_texture_colormapping_default(&tex->base.color_mapping);
  tex->dimensions = 3;

  node->storage = tex;
}

static int node_shader_gpu_tex_noise(GPUMaterial *mat,
                                     bNode *node,
                                     bNodeExecData *UNUSED(execdata),
                                     GPUNodeStack *in,
                                     GPUNodeStack *out)
{
  node_shader_gpu_default_tex_coord(mat, node, &in[0].link);
  node_shader_gpu_tex_mapping(mat, node, in, out);

  NodeTexNoise *tex = (NodeTexNoise *)node->storage;
  static const char *names[] = {
      "",
      "node_noise_texture_1d",
      "node_noise_texture_2d",
      "node_noise_texture_3d",
      "node_noise_texture_4d",
  };
  return GPU_stack_link(mat, node, names[tex->dimensions], in, out);
}

static void node_shader_update_tex_noise(bNodeTree *UNUSED(ntree), bNode *node)
{
  bNodeSocket *sockVector = nodeFindSocket(node, SOCK_IN, "Vector");
  bNodeSocket *sockW = nodeFindSocket(node, SOCK_IN, "W");

  NodeTexNoise *tex = (NodeTexNoise *)node->storage;
  nodeSetSocketAvailability(sockVector, tex->dimensions != 1);
  nodeSetSocketAvailability(sockW, tex->dimensions == 1 || tex->dimensions == 4);
}

class NoiseTextureFunction3D : public blender::fn::MultiFunction {

 public:
  NoiseTextureFunction3D()
  {
    static blender::fn::MFSignature signature = create_signature();
    this->set_signature(&signature);
  }

  static blender::fn::MFSignature create_signature()
  {
    blender::fn::MFSignatureBuilder signature{"Noise Texture"};
    signature.single_input<blender::float3>("Vector");
    signature.single_input<float>("Scale");
    signature.single_input<float>("Detail");
    signature.single_input<float>("Roughness");
    signature.single_input<float>("Distortion");
    signature.single_output<float>("Fac");
    signature.single_output<blender::ColorGeometry4f>("Color");
    return signature.build();
  }

  void call(blender::IndexMask mask,
            blender::fn::MFParams params,
            blender::fn::MFContext UNUSED(context)) const override
  {
    const blender::VArray<blender::float3> &vectors =
        params.readonly_single_input<blender::float3>(0, "Vector");
    const blender::VArray<float> &scales = params.readonly_single_input<float>(1, "Scale");
    const blender::VArray<float> &details = params.readonly_single_input<float>(2, "Detail");

    blender::MutableSpan<float> r_values = params.uninitialized_single_output<float>(5, "Fac");
    blender::MutableSpan<blender::ColorGeometry4f> r_colors =
        params.uninitialized_single_output<blender::ColorGeometry4f>(6, "Color");

    for (int i : mask) {
      const blender::float3 vector = vectors[i];
      const float scale = scales[i];
      const float noise_size = safe_divide(1.0f, scale);
      const float detail = details[i];
      const float noise1 = BLI_noise_generic_turbulence(
          noise_size, vector.x, vector.y, vector.z, detail, false, 1);
      const float noise2 = BLI_noise_generic_turbulence(
          noise_size, vector.y, vector.x + 100.0f, vector.z, detail, false, 1);
      const float noise3 = BLI_noise_generic_turbulence(
          noise_size, vector.z + 100.0f, vector.y, vector.x, detail, false, 1);
      r_values[i] = noise1;
      r_colors[i] = {noise1, noise2, noise3, 1.0f};
    }
  }
};

class NoiseTextureFunction1D : public blender::fn::MultiFunction {

 public:
  NoiseTextureFunction1D()
  {
    static blender::fn::MFSignature signature = create_signature();
    this->set_signature(&signature);
  }

  static blender::fn::MFSignature create_signature()
  {
    blender::fn::MFSignatureBuilder signature{"Noise Texture"};
    signature.single_input<float>("W");
    signature.single_input<float>("Scale");
    signature.single_input<float>("Detail");
    signature.single_input<float>("Roughness");
    signature.single_input<float>("Distortion");
    signature.single_output<float>("Fac");
    signature.single_output<blender::ColorGeometry4f>("Color");
    return signature.build();
  }

  void call(blender::IndexMask mask,
            blender::fn::MFParams params,
            blender::fn::MFContext UNUSED(context)) const override
  {
    const blender::VArray<float> &inputs = params.readonly_single_input<float>(0, "W");
    const blender::VArray<float> &scales = params.readonly_single_input<float>(1, "Scale");
    const blender::VArray<float> &details = params.readonly_single_input<float>(2, "Detail");

    blender::MutableSpan<float> r_values = params.uninitialized_single_output<float>(5, "Fac");
    blender::MutableSpan<blender::ColorGeometry4f> r_colors =
        params.uninitialized_single_output<blender::ColorGeometry4f>(6, "Color");

    for (int i : mask) {
      const float value = inputs[i];
      const float scale = scales[i];
      const float noise_size = safe_divide(1.0f, scale);
      const float detail = details[i];
      const float noise1 = BLI_noise_generic_turbulence(
          noise_size, value, value, value, detail, false, 1);
      const float noise2 = BLI_noise_generic_turbulence(
          noise_size, value, value + 100.0f, value, detail, false, 1);
      const float noise3 = BLI_noise_generic_turbulence(
          noise_size, value + 100.0f, value, value, detail, false, 1);
      r_values[i] = noise1;
      r_colors[i] = {noise1, noise2, noise3, 1.0f};
    }
  }
};

static void sh_node_tex_noise_expand_in_mf_network(blender::nodes::NodeMFNetworkBuilder &builder)
{
  /* TODO: Not only support 1D and 3D. */
  NodeTexNoise *tex = builder.dnode()->storage<NodeTexNoise>();
  if (tex->dimensions == 1) {
    builder.construct_and_set_matching_fn<NoiseTextureFunction1D>();
  }
  else if (tex->dimensions == 3) {
    builder.construct_and_set_matching_fn<NoiseTextureFunction3D>();
  }
  else {
    builder.set_not_implemented();
  }
}

/* node type definition */
void register_node_type_sh_tex_noise(void)
{
  static bNodeType ntype;

  sh_fn_node_type_base(&ntype, SH_NODE_TEX_NOISE, "Noise Texture", NODE_CLASS_TEXTURE, 0);
  node_type_socket_templates(&ntype, sh_node_tex_noise_in, sh_node_tex_noise_out);
  node_type_init(&ntype, node_shader_init_tex_noise);
  node_type_storage(
      &ntype, "NodeTexNoise", node_free_standard_storage, node_copy_standard_storage);
  node_type_gpu(&ntype, node_shader_gpu_tex_noise);
  node_type_update(&ntype, node_shader_update_tex_noise);
  ntype.expand_in_mf_network = sh_node_tex_noise_expand_in_mf_network;

  nodeRegisterType(&ntype);
}