/*
 * 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) 2019 Blender Foundation.
 * All rights reserved.
 */

/** \file
 * \ingroup editor/io
 */

#ifdef WITH_USD
#  include "DNA_modifier_types.h"
#  include "DNA_space_types.h"
#  include <string.h>

#  include "BKE_context.h"
#  include "BKE_main.h"
#  include "BKE_report.h"

#  include "BLI_blenlib.h"
#  include "BLI_path_util.h"
#  include "BLI_string.h"
#  include "BLI_utildefines.h"

#  include "BLT_translation.h"

#  include "ED_object.h"

#  include "MEM_guardedalloc.h"

#  include "RNA_access.h"
#  include "RNA_define.h"

#  include "RNA_enum_types.h"

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

#  include "WM_api.h"
#  include "WM_types.h"

#  include "DEG_depsgraph.h"

#  include "io_usd.h"
#  include "usd.h"

#  include <stdio.h>

const EnumPropertyItem rna_enum_usd_export_evaluation_mode_items[] = {
    {DAG_EVAL_RENDER,
     "RENDER",
     0,
     "Render",
     "Use Render settings for object visibility, modifier settings, etc"},
    {DAG_EVAL_VIEWPORT,
     "VIEWPORT",
     0,
     "Viewport",
     "Use Viewport settings for object visibility, modifier settings, etc"},
    {0, NULL, 0, NULL, NULL},
};

/* Stored in the wmOperator's customdata field to indicate it should run as a background job.
 * This is set when the operator is invoked, and not set when it is only executed. */
enum { AS_BACKGROUND_JOB = 1 };
typedef struct eUSDOperatorOptions {
  bool as_background_job;
} eUSDOperatorOptions;

static int wm_usd_export_invoke(bContext *C, wmOperator *op, const wmEvent *UNUSED(event))
{
  eUSDOperatorOptions *options = MEM_callocN(sizeof(eUSDOperatorOptions), "eUSDOperatorOptions");
  options->as_background_job = true;
  op->customdata = options;

  if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
    Main *bmain = CTX_data_main(C);
    char filepath[FILE_MAX];
    const char *main_blendfile_path = BKE_main_blendfile_path(bmain);

    if (main_blendfile_path[0] == '\0') {
      BLI_strncpy(filepath, "untitled", sizeof(filepath));
    }
    else {
      BLI_strncpy(filepath, main_blendfile_path, sizeof(filepath));
    }

    BLI_path_extension_replace(filepath, sizeof(filepath), ".usdc");
    RNA_string_set(op->ptr, "filepath", filepath);
  }

  WM_event_add_fileselect(C, op);

  return OPERATOR_RUNNING_MODAL;
}

static int wm_usd_export_exec(bContext *C, wmOperator *op)
{
  if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
    BKE_report(op->reports, RPT_ERROR, "No filename given");
    return OPERATOR_CANCELLED;
  }

  char filename[FILE_MAX];
  RNA_string_get(op->ptr, "filepath", filename);

  eUSDOperatorOptions *options = (eUSDOperatorOptions *)op->customdata;
  const bool as_background_job = (options != NULL && options->as_background_job);
  MEM_SAFE_FREE(op->customdata);

  const bool selected_objects_only = RNA_boolean_get(op->ptr, "selected_objects_only");
  const bool visible_objects_only = RNA_boolean_get(op->ptr, "visible_objects_only");
  const bool export_animation = RNA_boolean_get(op->ptr, "export_animation");
  const bool export_hair = RNA_boolean_get(op->ptr, "export_hair");
  const bool export_uvmaps = RNA_boolean_get(op->ptr, "export_uvmaps");
  const bool export_normals = RNA_boolean_get(op->ptr, "export_normals");
  const bool export_materials = RNA_boolean_get(op->ptr, "export_materials");
  const bool use_instancing = RNA_boolean_get(op->ptr, "use_instancing");
  const bool evaluation_mode = RNA_enum_get(op->ptr, "evaluation_mode");

  const bool generate_preview_surface = RNA_boolean_get(op->ptr, "generate_preview_surface");
  const bool export_textures = RNA_boolean_get(op->ptr, "export_textures");
  const bool overwrite_textures = RNA_boolean_get(op->ptr, "overwrite_textures");
  const bool relative_texture_paths = RNA_boolean_get(op->ptr, "relative_texture_paths");

  struct USDExportParams params = {
      export_animation,
      export_hair,
      export_uvmaps,
      export_normals,
      export_materials,
      selected_objects_only,
      visible_objects_only,
      use_instancing,
      evaluation_mode,
      generate_preview_surface,
      export_textures,
      overwrite_textures,
      relative_texture_paths,
  };

  bool ok = USD_export(C, filename, &params, as_background_job);

  return as_background_job || ok ? OPERATOR_FINISHED : OPERATOR_CANCELLED;
}

static void wm_usd_export_draw(bContext *UNUSED(C), wmOperator *op)
{
  uiLayout *layout = op->layout;
  uiLayout *col;
  struct PointerRNA *ptr = op->ptr;

  uiLayoutSetPropSep(layout, true);

  uiLayout *box = uiLayoutBox(layout);

  col = uiLayoutColumn(box, true);
  uiItemR(col, ptr, "selected_objects_only", 0, NULL, ICON_NONE);
  uiItemR(col, ptr, "visible_objects_only", 0, NULL, ICON_NONE);

  col = uiLayoutColumn(box, true);
  uiItemR(col, ptr, "export_animation", 0, NULL, ICON_NONE);
  uiItemR(col, ptr, "export_hair", 0, NULL, ICON_NONE);
  uiItemR(col, ptr, "export_uvmaps", 0, NULL, ICON_NONE);
  uiItemR(col, ptr, "export_normals", 0, NULL, ICON_NONE);
  uiItemR(col, ptr, "export_materials", 0, NULL, ICON_NONE);

  col = uiLayoutColumn(box, true);
  uiItemR(col, ptr, "evaluation_mode", 0, NULL, ICON_NONE);

  box = uiLayoutBox(layout);
  col = uiLayoutColumnWithHeading(box, true, IFACE_("Materials"));
  uiItemR(col, ptr, "generate_preview_surface", 0, NULL, ICON_NONE);
  const bool export_mtl = RNA_boolean_get(ptr, "export_materials");
  uiLayoutSetActive(col, export_mtl);

  uiLayout *row = uiLayoutRow(col, true);
  uiItemR(row, ptr, "export_textures", 0, NULL, ICON_NONE);
  const bool preview = RNA_boolean_get(ptr, "generate_preview_surface");
  uiLayoutSetActive(row, export_mtl && preview);

  row = uiLayoutRow(col, true);
  uiItemR(row, ptr, "overwrite_textures", 0, NULL, ICON_NONE);
  const bool export_tex = RNA_boolean_get(ptr, "export_textures");
  uiLayoutSetActive(row, export_mtl && preview && export_tex);

  row = uiLayoutRow(col, true);
  uiItemR(row, ptr, "relative_texture_paths", 0, NULL, ICON_NONE);
  uiLayoutSetActive(row, export_mtl && preview);

  box = uiLayoutBox(layout);
  uiItemL(box, IFACE_("Experimental"), ICON_NONE);
  uiItemR(box, ptr, "use_instancing", 0, NULL, ICON_NONE);
}

void WM_OT_usd_export(struct wmOperatorType *ot)
{
  ot->name = "Export USD";
  ot->description = "Export current scene in a USD archive";
  ot->idname = "WM_OT_usd_export";

  ot->invoke = wm_usd_export_invoke;
  ot->exec = wm_usd_export_exec;
  ot->poll = WM_operator_winactive;
  ot->ui = wm_usd_export_draw;

  WM_operator_properties_filesel(ot,
                                 FILE_TYPE_FOLDER | FILE_TYPE_USD,
                                 FILE_BLENDER,
                                 FILE_SAVE,
                                 WM_FILESEL_FILEPATH | WM_FILESEL_SHOW_PROPS,
                                 FILE_DEFAULTDISPLAY,
                                 FILE_SORT_DEFAULT);

  RNA_def_boolean(ot->srna,
                  "selected_objects_only",
                  false,
                  "Selection Only",
                  "Only selected objects are exported. Unselected parents of selected objects are "
                  "exported as empty transform");

  RNA_def_boolean(ot->srna,
                  "visible_objects_only",
                  true,
                  "Visible Only",
                  "Only visible objects are exported. Invisible parents of exported objects are "
                  "exported as empty transform");

  RNA_def_boolean(ot->srna,
                  "export_animation",
                  false,
                  "Animation",
                  "When checked, the render frame range is exported. When false, only the current "
                  "frame is exported");
  RNA_def_boolean(
      ot->srna, "export_hair", false, "Hair", "When checked, hair is exported as USD curves");
  RNA_def_boolean(ot->srna,
                  "export_uvmaps",
                  true,
                  "UV Maps",
                  "When checked, all UV maps of exported meshes are included in the export");
  RNA_def_boolean(ot->srna,
                  "export_normals",
                  true,
                  "Normals",
                  "When checked, normals of exported meshes are included in the export");
  RNA_def_boolean(ot->srna,
                  "export_materials",
                  true,
                  "Materials",
                  "When checked, the viewport settings of materials are exported as USD preview "
                  "materials, and material assignments are exported as geometry subsets");

  RNA_def_boolean(ot->srna,
                  "use_instancing",
                  false,
                  "Instancing",
                  "When checked, instanced objects are exported as references in USD. "
                  "When unchecked, instanced objects are exported as real objects");

  RNA_def_enum(ot->srna,
               "evaluation_mode",
               rna_enum_usd_export_evaluation_mode_items,
               DAG_EVAL_RENDER,
               "Use Settings for",
               "Determines visibility of objects, modifier settings, and other areas where there "
               "are different settings for viewport and rendering");

  RNA_def_boolean(ot->srna,
                  "generate_preview_surface",
                  true,
                  "To USD Preview Surface",
                  "Generate an approximate USD Preview Surface shader "
                  "representation of a Principled BSDF node network");

  RNA_def_boolean(ot->srna,
                  "export_textures",
                  true,
                  "Export Textures",
                  "If exporting materials, export textures referenced by material nodes "
                  "to a 'textures' directory in the same directory as the USD file");

  RNA_def_boolean(ot->srna,
                  "overwrite_textures",
                  false,
                  "Overwrite Textures",
                  "Allow overwriting existing texture files when exporting textures");

  RNA_def_boolean(ot->srna,
                  "relative_texture_paths",
                  true,
                  "Relative Texture Paths",
                  "Make texture asset paths relative to the USD file");
}

/* ====== USD Import ====== */

static int wm_usd_import_invoke(bContext *C, wmOperator *op, const wmEvent *event)
{
  eUSDOperatorOptions *options = MEM_callocN(sizeof(eUSDOperatorOptions), "eUSDOperatorOptions");
  options->as_background_job = true;
  op->customdata = options;

  return WM_operator_filesel(C, op, event);
}

static int wm_usd_import_exec(bContext *C, wmOperator *op)
{
  if (!RNA_struct_property_is_set(op->ptr, "filepath")) {
    BKE_report(op->reports, RPT_ERROR, "No filename given");
    return OPERATOR_CANCELLED;
  }

  char filename[FILE_MAX];
  RNA_string_get(op->ptr, "filepath", filename);

  eUSDOperatorOptions *options = (eUSDOperatorOptions *)op->customdata;
  const bool as_background_job = (options != NULL && options->as_background_job);
  MEM_SAFE_FREE(op->customdata);

  const float scale = RNA_float_get(op->ptr, "scale");

  const bool set_frame_range = RNA_boolean_get(op->ptr, "set_frame_range");

  const bool read_mesh_uvs = RNA_boolean_get(op->ptr, "read_mesh_uvs");
  const bool read_mesh_colors = RNA_boolean_get(op->ptr, "read_mesh_colors");

  char mesh_read_flag = MOD_MESHSEQ_READ_VERT | MOD_MESHSEQ_READ_POLY;
  if (read_mesh_uvs) {
    mesh_read_flag |= MOD_MESHSEQ_READ_UV;
  }
  if (read_mesh_colors) {
    mesh_read_flag |= MOD_MESHSEQ_READ_COLOR;
  }

  const bool import_cameras = RNA_boolean_get(op->ptr, "import_cameras");
  const bool import_curves = RNA_boolean_get(op->ptr, "import_curves");
  const bool import_lights = RNA_boolean_get(op->ptr, "import_lights");
  const bool import_materials = RNA_boolean_get(op->ptr, "import_materials");
  const bool import_meshes = RNA_boolean_get(op->ptr, "import_meshes");
  const bool import_volumes = RNA_boolean_get(op->ptr, "import_volumes");

  const bool import_subdiv = RNA_boolean_get(op->ptr, "import_subdiv");

  const bool import_instance_proxies = RNA_boolean_get(op->ptr, "import_instance_proxies");

  const bool import_visible_only = RNA_boolean_get(op->ptr, "import_visible_only");

  const bool create_collection = RNA_boolean_get(op->ptr, "create_collection");

  char *prim_path_mask = malloc(1024);
  RNA_string_get(op->ptr, "prim_path_mask", prim_path_mask);

  const bool import_guide = RNA_boolean_get(op->ptr, "import_guide");
  const bool import_proxy = RNA_boolean_get(op->ptr, "import_proxy");
  const bool import_render = RNA_boolean_get(op->ptr, "import_render");

  const bool import_usd_preview = RNA_boolean_get(op->ptr, "import_usd_preview");
  const bool set_material_blend = RNA_boolean_get(op->ptr, "set_material_blend");

  const float light_intensity_scale = RNA_float_get(op->ptr, "light_intensity_scale");

  /* TODO(makowalski): Add support for sequences. */
  const bool is_sequence = false;
  int offset = 0;
  int sequence_len = 1;

  /* Switch out of edit mode to avoid being stuck in it (T54326). */
  Object *obedit = CTX_data_edit_object(C);
  if (obedit) {
    ED_object_mode_set(C, OB_MODE_EDIT);
  }

  const bool validate_meshes = false;
  const bool use_instancing = false;

  struct USDImportParams params = {.scale = scale,
                                   .is_sequence = is_sequence,
                                   .set_frame_range = set_frame_range,
                                   .sequence_len = sequence_len,
                                   .offset = offset,
                                   .validate_meshes = validate_meshes,
                                   .mesh_read_flag = mesh_read_flag,
                                   .import_cameras = import_cameras,
                                   .import_curves = import_curves,
                                   .import_lights = import_lights,
                                   .import_materials = import_materials,
                                   .import_meshes = import_meshes,
                                   .import_volumes = import_volumes,
                                   .prim_path_mask = prim_path_mask,
                                   .import_subdiv = import_subdiv,
                                   .import_instance_proxies = import_instance_proxies,
                                   .create_collection = create_collection,
                                   .import_guide = import_guide,
                                   .import_proxy = import_proxy,
                                   .import_render = import_render,
                                   .import_visible_only = import_visible_only,
                                   .use_instancing = use_instancing,
                                   .import_usd_preview = import_usd_preview,
                                   .set_material_blend = set_material_blend,
                                   .light_intensity_scale = light_intensity_scale};

  const bool ok = USD_import(C, filename, &params, as_background_job);

  return as_background_job || ok ? OPERATOR_FINISHED : OPERATOR_CANCELLED;
}

static void wm_usd_import_draw(bContext *UNUSED(C), wmOperator *op)
{
  uiLayout *layout = op->layout;
  struct PointerRNA *ptr = op->ptr;

  uiLayoutSetPropSep(layout, true);
  uiLayoutSetPropDecorate(layout, false);

  uiLayout *box = uiLayoutBox(layout);
  uiLayout *col = uiLayoutColumnWithHeading(box, true, IFACE_("Data Types"));
  uiItemR(col, ptr, "import_cameras", 0, NULL, ICON_NONE);
  uiItemR(col, ptr, "import_curves", 0, NULL, ICON_NONE);
  uiItemR(col, ptr, "import_lights", 0, NULL, ICON_NONE);
  uiItemR(col, ptr, "import_materials", 0, NULL, ICON_NONE);
  uiItemR(col, ptr, "import_meshes", 0, NULL, ICON_NONE);
  uiItemR(col, ptr, "import_volumes", 0, NULL, ICON_NONE);
  uiItemR(box, ptr, "prim_path_mask", 0, NULL, ICON_NONE);
  uiItemR(box, ptr, "scale", 0, NULL, ICON_NONE);

  box = uiLayoutBox(layout);
  col = uiLayoutColumnWithHeading(box, true, IFACE_("Mesh Data"));
  uiItemR(col, ptr, "read_mesh_uvs", 0, NULL, ICON_NONE);
  uiItemR(col, ptr, "read_mesh_colors", 0, NULL, ICON_NONE);
  col = uiLayoutColumnWithHeading(box, true, IFACE_("Include"));
  uiItemR(col, ptr, "import_subdiv", 0, IFACE_("Subdivision"), ICON_NONE);
  uiItemR(col, ptr, "import_instance_proxies", 0, NULL, ICON_NONE);
  uiItemR(col, ptr, "import_visible_only", 0, NULL, ICON_NONE);
  uiItemR(col, ptr, "import_guide", 0, NULL, ICON_NONE);
  uiItemR(col, ptr, "import_proxy", 0, NULL, ICON_NONE);
  uiItemR(col, ptr, "import_render", 0, NULL, ICON_NONE);

  col = uiLayoutColumnWithHeading(box, true, IFACE_("Options"));
  uiItemR(col, ptr, "set_frame_range", 0, NULL, ICON_NONE);
  uiItemR(col, ptr, "relative_path", 0, NULL, ICON_NONE);
  uiItemR(col, ptr, "create_collection", 0, NULL, ICON_NONE);
  uiItemR(box, ptr, "light_intensity_scale", 0, NULL, ICON_NONE);

  box = uiLayoutBox(layout);
  col = uiLayoutColumnWithHeading(box, true, IFACE_("Experimental"));
  uiItemR(col, ptr, "import_usd_preview", 0, NULL, ICON_NONE);
  uiLayoutSetEnabled(col, RNA_boolean_get(ptr, "import_materials"));
  uiLayout *row = uiLayoutRow(col, true);
  uiItemR(row, ptr, "set_material_blend", 0, NULL, ICON_NONE);
  uiLayoutSetEnabled(row, RNA_boolean_get(ptr, "import_usd_preview"));
}

void WM_OT_usd_import(struct wmOperatorType *ot)
{
  ot->name = "Import USD";
  ot->description = "Import USD stage into current scene";
  ot->idname = "WM_OT_usd_import";

  ot->invoke = wm_usd_import_invoke;
  ot->exec = wm_usd_import_exec;
  ot->poll = WM_operator_winactive;
  ot->ui = wm_usd_import_draw;

  WM_operator_properties_filesel(ot,
                                 FILE_TYPE_FOLDER | FILE_TYPE_USD,
                                 FILE_BLENDER,
                                 FILE_OPENFILE,
                                 WM_FILESEL_FILEPATH | WM_FILESEL_RELPATH | WM_FILESEL_SHOW_PROPS,
                                 FILE_DEFAULTDISPLAY,
                                 FILE_SORT_ALPHA);

  RNA_def_float(
      ot->srna,
      "scale",
      1.0f,
      0.0001f,
      1000.0f,
      "Scale",
      "Value by which to enlarge or shrink the objects with respect to the world's origin",
      0.0001f,
      1000.0f);

  RNA_def_boolean(ot->srna,
                  "set_frame_range",
                  true,
                  "Set Frame Range",
                  "Update the scene's start and end frame to match those of the USD archive");

  RNA_def_boolean(ot->srna, "import_cameras", true, "Cameras", "");
  RNA_def_boolean(ot->srna, "import_curves", true, "Curves", "");
  RNA_def_boolean(ot->srna, "import_lights", true, "Lights", "");
  RNA_def_boolean(ot->srna, "import_materials", true, "Materials", "");
  RNA_def_boolean(ot->srna, "import_meshes", true, "Meshes", "");
  RNA_def_boolean(ot->srna, "import_volumes", true, "Volumes", "");

  RNA_def_boolean(ot->srna,
                  "import_subdiv",
                  false,
                  "Import Subdivision Scheme",
                  "Create subdivision surface modifiers based on the USD "
                  "SubdivisionScheme attribute");

  RNA_def_boolean(ot->srna,
                  "import_instance_proxies",
                  true,
                  "Import Instance Proxies",
                  "Create unique Blender objects for USD instances");

  RNA_def_boolean(ot->srna,
                  "import_visible_only",
                  true,
                  "Visible Primitives Only",
                  "Do not import invisible USD primitives. "
                  "Only applies to primitives with a non-animated visibility attribute. "
                  "Primitives with animated visibility will always be imported");

  RNA_def_boolean(ot->srna,
                  "create_collection",
                  false,
                  "Create Collection",
                  "Add all imported objects to a new collection");

  RNA_def_boolean(ot->srna, "read_mesh_uvs", true, "UV Coordinates", "Read mesh UV coordinates");

  RNA_def_boolean(ot->srna, "read_mesh_colors", false, "Vertex Colors", "Read mesh vertex colors");

  RNA_def_string(ot->srna,
                 "prim_path_mask",
                 NULL,
                 1024,
                 "Path Mask",
                 "Import only the subset of the USD scene rooted at the given primitive");

  RNA_def_boolean(ot->srna, "import_guide", false, "Guide", "Import guide geometry");

  RNA_def_boolean(ot->srna, "import_proxy", true, "Proxy", "Import proxy geometry");

  RNA_def_boolean(ot->srna, "import_render", true, "Render", "Import final render geometry");

  RNA_def_boolean(ot->srna,
                  "import_usd_preview",
                  false,
                  "Import USD Preview",
                  "Convert UsdPreviewSurface shaders to Principled BSDF shader networks");

  RNA_def_boolean(ot->srna,
                  "set_material_blend",
                  true,
                  "Set Material Blend",
                  "If the Import USD Preview option is enabled, "
                  "the material blend method will automatically be set based on the "
                  "shader's opacity and opacityThreshold inputs");

  RNA_def_float(ot->srna,
                "light_intensity_scale",
                1.0f,
                0.0001f,
                10000.0f,
                "Light Intensity Scale",
                "Scale for the intensity of imported lights",
                0.0001f,
                1000.0f);
}

#endif /* WITH_USD */