/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * 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) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * Contributor(s): Blender Foundation, shapekey support
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file blender/editors/object/object_shapekey.c
 *  \ingroup edobj
 */


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

#ifndef WIN32
#include <unistd.h>
#else
#include <io.h>
#endif

#include "MEM_guardedalloc.h"

#include "BLI_blenlib.h"
#include "BLI_math.h"
#include "BLI_utildefines.h"

#include "DNA_curve_types.h"
#include "DNA_key_types.h"
#include "DNA_lattice_types.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "DNA_object_types.h"

#include "BKE_context.h"
#include "BKE_key.h"
#include "BKE_library.h"
#include "BKE_main.h"
#include "BKE_object.h"
#include "BKE_lattice.h"
#include "BKE_curve.h"

#include "DEG_depsgraph.h"
#include "DEG_depsgraph_build.h"

#include "BLI_sys_types.h" // for intptr_t support

#include "ED_object.h"
#include "ED_mesh.h"

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

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

#include "object_intern.h"

/*********************** add shape key ***********************/

static void ED_object_shape_key_add(bContext *C, Object *ob, const bool from_mix)
{
	Main *bmain = CTX_data_main(C);
	KeyBlock *kb;
	if ((kb = BKE_object_shapekey_insert(bmain, ob, NULL, from_mix))) {
		Key *key = BKE_key_from_object(ob);
		/* for absolute shape keys, new keys may not be added last */
		ob->shapenr = BLI_findindex(&key->block, kb) + 1;

		WM_event_add_notifier(C, NC_OBJECT | ND_DRAW, ob);
	}
}

/*********************** remove shape key ***********************/

static bool object_shapekey_remove(Main *bmain, Object *ob)
{
	KeyBlock *kb;
	Key *key = BKE_key_from_object(ob);

	if (key == NULL) {
		return false;
	}

	kb = BLI_findlink(&key->block, ob->shapenr - 1);
	if (kb) {
		return BKE_object_shapekey_remove(bmain, ob, kb);
	}

	return false;
}

static bool object_shape_key_mirror(bContext *C, Object *ob,
                                    int *r_totmirr, int *r_totfail, bool use_topology)
{
	KeyBlock *kb;
	Key *key;
	int totmirr = 0, totfail = 0;

	*r_totmirr = *r_totfail = 0;

	key = BKE_key_from_object(ob);
	if (key == NULL)
		return 0;

	kb = BLI_findlink(&key->block, ob->shapenr - 1);

	if (kb) {
		char *tag_elem = MEM_callocN(sizeof(char) * kb->totelem, "shape_key_mirror");


		if (ob->type == OB_MESH) {
			Mesh *me = ob->data;
			MVert *mv;
			int i1, i2;
			float *fp1, *fp2;
			float tvec[3];

			ED_mesh_mirror_spatial_table(ob, NULL, NULL, NULL, 's');

			for (i1 = 0, mv = me->mvert; i1 < me->totvert; i1++, mv++) {
				i2 = mesh_get_x_mirror_vert(ob, NULL, i1, use_topology);
				if (i2 == i1) {
					fp1 = ((float *)kb->data) + i1 * 3;
					fp1[0] = -fp1[0];
					tag_elem[i1] = 1;
					totmirr++;
				}
				else if (i2 != -1) {
					if (tag_elem[i1] == 0 && tag_elem[i2] == 0) {
						fp1 = ((float *)kb->data) + i1 * 3;
						fp2 = ((float *)kb->data) + i2 * 3;

						copy_v3_v3(tvec,    fp1);
						copy_v3_v3(fp1, fp2);
						copy_v3_v3(fp2, tvec);

						/* flip x axis */
						fp1[0] = -fp1[0];
						fp2[0] = -fp2[0];
						totmirr++;
					}
					tag_elem[i1] = tag_elem[i2] = 1;
				}
				else {
					totfail++;
				}
			}

			ED_mesh_mirror_spatial_table(ob, NULL, NULL, NULL, 'e');
		}
		else if (ob->type == OB_LATTICE) {
			Lattice *lt = ob->data;
			int i1, i2;
			float *fp1, *fp2;
			int u, v, w;
			/* half but found up odd value */
			const int pntsu_half = (lt->pntsu / 2) + (lt->pntsu % 2);

			/* currently editmode isn't supported by mesh so
			 * ignore here for now too */

			/* if (lt->editlatt) lt = lt->editlatt->latt; */

			for (w = 0; w < lt->pntsw; w++) {
				for (v = 0; v < lt->pntsv; v++) {
					for (u = 0; u < pntsu_half; u++) {
						int u_inv = (lt->pntsu - 1) - u;
						float tvec[3];
						if (u == u_inv) {
							i1 = BKE_lattice_index_from_uvw(lt, u, v, w);
							fp1 = ((float *)kb->data) + i1 * 3;
							fp1[0] = -fp1[0];
							totmirr++;
						}
						else {
							i1 = BKE_lattice_index_from_uvw(lt, u, v, w);
							i2 = BKE_lattice_index_from_uvw(lt, u_inv, v, w);

							fp1 = ((float *)kb->data) + i1 * 3;
							fp2 = ((float *)kb->data) + i2 * 3;

							copy_v3_v3(tvec, fp1);
							copy_v3_v3(fp1, fp2);
							copy_v3_v3(fp2, tvec);
							fp1[0] = -fp1[0];
							fp2[0] = -fp2[0];
							totmirr++;
						}
					}
				}
			}
		}

		MEM_freeN(tag_elem);
	}

	*r_totmirr = totmirr;
	*r_totfail = totfail;

	DEG_id_tag_update(&ob->id, OB_RECALC_DATA);
	WM_event_add_notifier(C, NC_OBJECT | ND_DRAW, ob);

	return 1;
}

/********************** shape key operators *********************/

static int shape_key_mode_poll(bContext *C)
{
	Object *ob = ED_object_context(C);
	ID *data = (ob) ? ob->data : NULL;
	return (ob && !ID_IS_LINKED(ob) && data && !ID_IS_LINKED(data) && ob->mode != OB_MODE_EDIT);
}

static int shape_key_mode_exists_poll(bContext *C)
{
	Object *ob = ED_object_context(C);
	ID *data = (ob) ? ob->data : NULL;

	/* same as shape_key_mode_poll */
	return (ob && !ID_IS_LINKED(ob) && data && !ID_IS_LINKED(data) && ob->mode != OB_MODE_EDIT) &&
	       /* check a keyblock exists */
	       (BKE_keyblock_from_object(ob) != NULL);
}

static int shape_key_move_poll(bContext *C)
{
	/* Same as shape_key_mode_exists_poll above, but ensure we have at least two shapes! */
	Object *ob = ED_object_context(C);
	ID *data = (ob) ? ob->data : NULL;
	Key *key = BKE_key_from_object(ob);

	return (ob && !ID_IS_LINKED(ob) && data && !ID_IS_LINKED(data) &&
	        ob->mode != OB_MODE_EDIT && key && key->totkey > 1);
}

static int shape_key_poll(bContext *C)
{
	Object *ob = ED_object_context(C);
	ID *data = (ob) ? ob->data : NULL;
	return (ob && !ID_IS_LINKED(ob) && data && !ID_IS_LINKED(data));
}

static int shape_key_add_exec(bContext *C, wmOperator *op)
{
	Object *ob = ED_object_context(C);
	const bool from_mix = RNA_boolean_get(op->ptr, "from_mix");

	ED_object_shape_key_add(C, ob, from_mix);

	DEG_id_tag_update(&ob->id, OB_RECALC_DATA);
	DEG_relations_tag_update(CTX_data_main(C));

	return OPERATOR_FINISHED;
}

void OBJECT_OT_shape_key_add(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Add Shape Key";
	ot->idname = "OBJECT_OT_shape_key_add";
	ot->description = "Add shape key to the object";

	/* api callbacks */
	ot->poll = shape_key_mode_poll;
	ot->exec = shape_key_add_exec;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

	/* properties */
	RNA_def_boolean(ot->srna, "from_mix", true, "From Mix", "Create the new shape key from the existing mix of keys");
}

static int shape_key_remove_exec(bContext *C, wmOperator *op)
{
	Main *bmain = CTX_data_main(C);
	Object *ob = ED_object_context(C);
	bool changed = false;

	if (RNA_boolean_get(op->ptr, "all")) {
		changed = BKE_object_shapekey_free(bmain, ob);
	}
	else {
		changed = object_shapekey_remove(bmain, ob);
	}

	if (changed) {
		DEG_id_tag_update(&ob->id, OB_RECALC_DATA);
		DEG_relations_tag_update(CTX_data_main(C));
		WM_event_add_notifier(C, NC_OBJECT | ND_DRAW, ob);

		return OPERATOR_FINISHED;
	}
	else {
		return OPERATOR_CANCELLED;
	}
}

void OBJECT_OT_shape_key_remove(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Remove Shape Key";
	ot->idname = "OBJECT_OT_shape_key_remove";
	ot->description = "Remove shape key from the object";

	/* api callbacks */
	ot->poll = shape_key_mode_exists_poll;
	ot->exec = shape_key_remove_exec;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

	/* properties */
	RNA_def_boolean(ot->srna, "all", 0, "All", "Remove all shape keys");
}

static int shape_key_clear_exec(bContext *C, wmOperator *UNUSED(op))
{
	Object *ob = ED_object_context(C);
	Key *key = BKE_key_from_object(ob);
	KeyBlock *kb = BKE_keyblock_from_object(ob);

	if (!key || !kb)
		return OPERATOR_CANCELLED;

	for (kb = key->block.first; kb; kb = kb->next)
		kb->curval = 0.0f;

	DEG_id_tag_update(&ob->id, OB_RECALC_DATA);
	WM_event_add_notifier(C, NC_OBJECT | ND_DRAW, ob);

	return OPERATOR_FINISHED;
}

void OBJECT_OT_shape_key_clear(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Clear Shape Keys";
	ot->description = "Clear weights for all shape keys";
	ot->idname = "OBJECT_OT_shape_key_clear";

	/* api callbacks */
	ot->poll = shape_key_poll;
	ot->exec = shape_key_clear_exec;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}

/* starting point and step size could be optional */
static int shape_key_retime_exec(bContext *C, wmOperator *UNUSED(op))
{
	Object *ob = ED_object_context(C);
	Key *key = BKE_key_from_object(ob);
	KeyBlock *kb = BKE_keyblock_from_object(ob);
	float cfra = 0.0f;

	if (!key || !kb)
		return OPERATOR_CANCELLED;

	for (kb = key->block.first; kb; kb = kb->next)
		kb->pos = (cfra += 0.1f);

	DEG_id_tag_update(&ob->id, OB_RECALC_DATA);
	WM_event_add_notifier(C, NC_OBJECT | ND_DRAW, ob);

	return OPERATOR_FINISHED;
}

void OBJECT_OT_shape_key_retime(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Re-Time Shape Keys";
	ot->description = "Resets the timing for absolute shape keys";
	ot->idname = "OBJECT_OT_shape_key_retime";

	/* api callbacks */
	ot->poll = shape_key_poll;
	ot->exec = shape_key_retime_exec;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}

static int shape_key_mirror_exec(bContext *C, wmOperator *op)
{
	Object *ob = ED_object_context(C);
	int totmirr = 0, totfail = 0;
	bool use_topology = RNA_boolean_get(op->ptr, "use_topology");

	if (!object_shape_key_mirror(C, ob, &totmirr, &totfail, use_topology))
		return OPERATOR_CANCELLED;

	ED_mesh_report_mirror(op, totmirr, totfail);

	return OPERATOR_FINISHED;
}

void OBJECT_OT_shape_key_mirror(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Mirror Shape Key";
	ot->idname = "OBJECT_OT_shape_key_mirror";
	ot->description = "Mirror the current shape key along the local X axis";

	/* api callbacks */
	ot->poll = shape_key_mode_poll;
	ot->exec = shape_key_mirror_exec;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

	/* properties */
	RNA_def_boolean(ot->srna, "use_topology", 0, "Topology Mirror",
	                "Use topology based mirroring (for when both sides of mesh have matching, unique topology)");
}


enum {
	KB_MOVE_TOP = -2,
	KB_MOVE_UP = -1,
	KB_MOVE_DOWN = 1,
	KB_MOVE_BOTTOM = 2,
};

static int shape_key_move_exec(bContext *C, wmOperator *op)
{
	Object *ob = ED_object_context(C);

	Key *key = BKE_key_from_object(ob);
	const int type = RNA_enum_get(op->ptr, "type");
	const int totkey = key->totkey;
	const int act_index = ob->shapenr - 1;
	int new_index;

	switch (type) {
		case KB_MOVE_TOP:
			/* Replace the ref key only if we're at the top already (only for relative keys) */
			new_index = (ELEM(act_index, 0, 1) || key->type == KEY_NORMAL) ? 0 : 1;
			break;
		case KB_MOVE_BOTTOM:
			new_index = totkey - 1;
			break;
		case KB_MOVE_UP:
		case KB_MOVE_DOWN:
		default:
			new_index = (totkey + act_index + type) % totkey;
			break;
	}

	if (!BKE_keyblock_move(ob, act_index, new_index)) {
		return OPERATOR_CANCELLED;
	}

	DEG_id_tag_update(&ob->id, OB_RECALC_DATA);
	WM_event_add_notifier(C, NC_OBJECT | ND_DRAW, ob);

	return OPERATOR_FINISHED;
}

void OBJECT_OT_shape_key_move(wmOperatorType *ot)
{
	static const EnumPropertyItem slot_move[] = {
		{KB_MOVE_TOP, "TOP", 0, "Top", "Top of the list"},
		{KB_MOVE_UP, "UP", 0, "Up", ""},
		{KB_MOVE_DOWN, "DOWN", 0, "Down", ""},
		{KB_MOVE_BOTTOM, "BOTTOM", 0, "Bottom", "Bottom of the list"},
		{ 0, NULL, 0, NULL, NULL }
	};

	/* identifiers */
	ot->name = "Move Shape Key";
	ot->idname = "OBJECT_OT_shape_key_move";
	ot->description = "Move the active shape key up/down in the list";

	/* api callbacks */
	ot->poll = shape_key_move_poll;
	ot->exec = shape_key_move_exec;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

	RNA_def_enum(ot->srna, "type", slot_move, 0, "Type", "");
}