/*
 * 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 by the Blender Foundation.
 * All rights reserved.
 */

/** \file
 * \ingroup modifiers
 */


#include <string.h>

#include "BLI_utildefines.h"

#include "DNA_object_types.h"

#include "BKE_editmesh.h"
#include "BKE_lattice.h"
#include "BKE_library.h"
#include "BKE_library_query.h"
#include "BKE_mesh.h"
#include "BKE_modifier.h"

#include "DEG_depsgraph_query.h"

#include "MEM_guardedalloc.h"

#include "MOD_util.h"

static void initData(ModifierData *md)
{
	LatticeModifierData *lmd = (LatticeModifierData *) md;
	lmd->strength = 1.0f;
}

static void requiredDataMask(Object *UNUSED(ob), ModifierData *md, CustomData_MeshMasks *r_cddata_masks)
{
	LatticeModifierData *lmd = (LatticeModifierData *)md;

	/* ask for vertexgroups if we need them */
	if (lmd->name[0] != '\0') {
		r_cddata_masks->vmask |= CD_MASK_MDEFORMVERT;
	}
}

static bool isDisabled(const struct Scene *UNUSED(scene), ModifierData *md, bool UNUSED(userRenderParams))
{
	LatticeModifierData *lmd = (LatticeModifierData *) md;

	return !lmd->object;
}

static void foreachObjectLink(
        ModifierData *md, Object *ob,
        ObjectWalkFunc walk, void *userData)
{
	LatticeModifierData *lmd = (LatticeModifierData *) md;

	walk(userData, ob, &lmd->object, IDWALK_CB_NOP);
}

static void updateDepsgraph(ModifierData *md, const ModifierUpdateDepsgraphContext *ctx)
{
	LatticeModifierData *lmd = (LatticeModifierData *)md;
	if (lmd->object != NULL) {
		DEG_add_object_relation(ctx->node, lmd->object, DEG_OB_COMP_GEOMETRY, "Lattice Modifier");
		DEG_add_object_relation(ctx->node, lmd->object, DEG_OB_COMP_TRANSFORM, "Lattice Modifier");
	}
	DEG_add_modifier_to_transform_relation(ctx->node, "Lattice Modifier");
}

static void deformVerts(
        ModifierData *md, const ModifierEvalContext *ctx,
        struct Mesh *mesh,
        float (*vertexCos)[3],
        int numVerts)
{
	LatticeModifierData *lmd = (LatticeModifierData *) md;
	struct Mesh *mesh_src = MOD_deform_mesh_eval_get(ctx->object, NULL, mesh, NULL, numVerts, false, false);

	MOD_previous_vcos_store(md, vertexCos); /* if next modifier needs original vertices */

	lattice_deform_verts(lmd->object, ctx->object, mesh_src,
	                     vertexCos, numVerts, lmd->name, lmd->strength);

	if (!ELEM(mesh_src, NULL, mesh)) {
		BKE_id_free(NULL, mesh_src);
	}
}

static void deformVertsEM(
        ModifierData *md, const ModifierEvalContext *ctx, struct BMEditMesh *em,
        struct Mesh *mesh, float (*vertexCos)[3], int numVerts)
{
	struct Mesh *mesh_src = MOD_deform_mesh_eval_get(ctx->object, em, mesh, NULL, numVerts, false, false);

	deformVerts(md, ctx, mesh_src, vertexCos, numVerts);

	if (!ELEM(mesh_src, NULL, mesh)) {
		BKE_id_free(NULL, mesh_src);
	}
}


ModifierTypeInfo modifierType_Lattice = {
	/* name */              "Lattice",
	/* structName */        "LatticeModifierData",
	/* structSize */        sizeof(LatticeModifierData),
	/* type */              eModifierTypeType_OnlyDeform,
	/* flags */             eModifierTypeFlag_AcceptsCVs |
	                        eModifierTypeFlag_AcceptsLattice |
	                        eModifierTypeFlag_SupportsEditmode,

	/* copyData */          modifier_copyData_generic,

	/* deformVerts */       deformVerts,
	/* deformMatrices */    NULL,
	/* deformVertsEM */     deformVertsEM,
	/* deformMatricesEM */  NULL,
	/* applyModifier */     NULL,

	/* initData */          initData,
	/* requiredDataMask */  requiredDataMask,
	/* freeData */          NULL,
	/* isDisabled */        isDisabled,
	/* updateDepsgraph */   updateDepsgraph,
	/* dependsOnTime */     NULL,
	/* dependsOnNormals */	NULL,
	/* foreachObjectLink */ foreachObjectLink,
	/* foreachIDLink */     NULL,
	/* foreachTexLink */    NULL,
	/* freeRuntimeData */   NULL,
};