/* SPDX-License-Identifier: GPL-2.0-or-later
 * Copyright 2001-2002 NaN Holding BV. All rights reserved. */

/** \file
 * \ingroup bke
 */

#include <math.h>
#include <stdlib.h>
#include <string.h>

#include "MEM_guardedalloc.h"

/* Allow using deprecated functionality for .blend file I/O. */
#define DNA_DEPRECATED_ALLOW

#include "DNA_defaults.h"
#include "DNA_scene_types.h"
#include "DNA_texture_types.h"
#include "DNA_world_types.h"

#include "BLI_listbase.h"
#include "BLI_utildefines.h"

#include "BKE_anim_data.h"
#include "BKE_icons.h"
#include "BKE_idtype.h"
#include "BKE_lib_id.h"
#include "BKE_lib_query.h"
#include "BKE_main.h"
#include "BKE_node.h"
#include "BKE_world.h"

#include "BLT_translation.h"

#include "DRW_engine.h"

#include "DEG_depsgraph.h"

#include "GPU_material.h"

#include "BLO_read_write.h"

/** Free (or release) any data used by this world (does not free the world itself). */
static void world_free_data(ID *id)
{
  World *wrld = (World *)id;

  DRW_drawdata_free(id);

  /* is no lib link block, but world extension */
  if (wrld->nodetree) {
    ntreeFreeEmbeddedTree(wrld->nodetree);
    MEM_freeN(wrld->nodetree);
    wrld->nodetree = NULL;
  }

  GPU_material_free(&wrld->gpumaterial);

  BKE_icon_id_delete((struct ID *)wrld);
  BKE_previewimg_free(&wrld->preview);

  MEM_SAFE_FREE(wrld->lightgroup);
}

static void world_init_data(ID *id)
{
  World *wrld = (World *)id;
  BLI_assert(MEMCMP_STRUCT_AFTER_IS_ZERO(wrld, id));

  MEMCPY_STRUCT_AFTER(wrld, DNA_struct_default_get(World), id);
}

/**
 * Only copy internal data of World ID from source
 * to already allocated/initialized destination.
 * You probably never want to use that directly,
 * use #BKE_id_copy or #BKE_id_copy_ex for typical needs.
 *
 * WARNING! This function will not handle ID user count!
 *
 * \param flag: Copying options (see BKE_lib_id.h's LIB_ID_COPY_... flags for more).
 */
static void world_copy_data(Main *bmain, ID *id_dst, const ID *id_src, const int flag)
{
  World *wrld_dst = (World *)id_dst;
  const World *wrld_src = (const World *)id_src;

  const bool is_localized = (flag & LIB_ID_CREATE_LOCAL) != 0;
  /* We always need allocation of our private ID data. */
  const int flag_private_id_data = flag & ~LIB_ID_CREATE_NO_ALLOCATE;

  if (wrld_src->nodetree) {
    if (is_localized) {
      wrld_dst->nodetree = ntreeLocalize(wrld_src->nodetree);
    }
    else {
      BKE_id_copy_ex(
          bmain, (ID *)wrld_src->nodetree, (ID **)&wrld_dst->nodetree, flag_private_id_data);
    }
    wrld_dst->nodetree->owner_id = &wrld_dst->id;
  }

  BLI_listbase_clear(&wrld_dst->gpumaterial);
  BLI_listbase_clear((ListBase *)&wrld_dst->drawdata);

  if ((flag & LIB_ID_COPY_NO_PREVIEW) == 0) {
    BKE_previewimg_id_copy(&wrld_dst->id, &wrld_src->id);
  }
  else {
    wrld_dst->preview = NULL;
  }

  if (wrld_src->lightgroup) {
    wrld_dst->lightgroup = (LightgroupMembership *)MEM_dupallocN(wrld_src->lightgroup);
  }
}

static void world_foreach_id(ID *id, LibraryForeachIDData *data)
{
  World *world = (World *)id;

  if (world->nodetree) {
    /* nodetree **are owned by IDs**, treat them as mere sub-data and not real ID! */
    BKE_LIB_FOREACHID_PROCESS_FUNCTION_CALL(
        data, BKE_library_foreach_ID_embedded(data, (ID **)&world->nodetree));
  }
}

static void world_blend_write(BlendWriter *writer, ID *id, const void *id_address)
{
  World *wrld = (World *)id;

  /* Clean up, important in undo case to reduce false detection of changed datablocks. */
  BLI_listbase_clear(&wrld->gpumaterial);

  /* write LibData */
  BLO_write_id_struct(writer, World, id_address, &wrld->id);
  BKE_id_blend_write(writer, &wrld->id);

  if (wrld->adt) {
    BKE_animdata_blend_write(writer, wrld->adt);
  }

  /* nodetree is integral part of world, no libdata */
  if (wrld->nodetree) {
    BLO_write_struct(writer, bNodeTree, wrld->nodetree);
    ntreeBlendWrite(writer, wrld->nodetree);
  }

  BKE_previewimg_blend_write(writer, wrld->preview);

  if (wrld->lightgroup) {
    BLO_write_struct(writer, LightgroupMembership, wrld->lightgroup);
  }
}

static void world_blend_read_data(BlendDataReader *reader, ID *id)
{
  World *wrld = (World *)id;
  BLO_read_data_address(reader, &wrld->adt);
  BKE_animdata_blend_read_data(reader, wrld->adt);

  BLO_read_data_address(reader, &wrld->preview);
  BKE_previewimg_blend_read(reader, wrld->preview);
  BLI_listbase_clear(&wrld->gpumaterial);

  BLO_read_data_address(reader, &wrld->lightgroup);
}

static void world_blend_read_lib(BlendLibReader *reader, ID *id)
{
  World *wrld = (World *)id;
  BLO_read_id_address(reader, wrld->id.lib, &wrld->ipo); /* XXX deprecated, old animation system */
}

static void world_blend_read_expand(BlendExpander *expander, ID *id)
{
  World *wrld = (World *)id;
  BLO_expand(expander, wrld->ipo); /* XXX deprecated, old animation system */
}

IDTypeInfo IDType_ID_WO = {
    .id_code = ID_WO,
    .id_filter = FILTER_ID_WO,
    .main_listbase_index = INDEX_ID_WO,
    .struct_size = sizeof(World),
    .name = "World",
    .name_plural = "worlds",
    .translation_context = BLT_I18NCONTEXT_ID_WORLD,
    .flags = IDTYPE_FLAGS_APPEND_IS_REUSABLE,
    .asset_type_info = NULL,

    .init_data = world_init_data,
    .copy_data = world_copy_data,
    .free_data = world_free_data,
    .make_local = NULL,
    .foreach_id = world_foreach_id,
    .foreach_cache = NULL,
    .foreach_path = NULL,
    .owner_pointer_get = NULL,

    .blend_write = world_blend_write,
    .blend_read_data = world_blend_read_data,
    .blend_read_lib = world_blend_read_lib,
    .blend_read_expand = world_blend_read_expand,

    .blend_read_undo_preserve = NULL,

    .lib_override_apply_post = NULL,
};

World *BKE_world_add(Main *bmain, const char *name)
{
  World *wrld;

  wrld = BKE_id_new(bmain, ID_WO, name);

  return wrld;
}

void BKE_world_eval(struct Depsgraph *depsgraph, World *world)
{
  DEG_debug_print_eval(depsgraph, __func__, world->id.name, world);
  GPU_material_free(&world->gpumaterial);
}