/**
 * $Id$
 *
 * ***** 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * Contributor(s): Blender Foundation
 *
 * ***** END GPL LICENSE BLOCK *****
 */

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

#include "MEM_guardedalloc.h"

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

#include "BKE_context.h"
#include "BKE_depsgraph.h"
#include "BKE_key.h"
#include "BKE_lattice.h"
#include "BKE_mesh.h"
#include "BKE_utildefines.h"

#include "ED_object.h"
#include "ED_screen.h"
#include "ED_view3d.h"
#include "ED_util.h"

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

#include "object_intern.h"

/********************** Load/Make/Free ********************/

void free_editLatt(Object *ob)
{
	Lattice *lt= ob->data;
	
	if(lt->editlatt) {
		if(lt->editlatt->def)
			MEM_freeN(lt->editlatt->def);
		if(lt->editlatt->dvert) 
			free_dverts(lt->editlatt->dvert, lt->editlatt->pntsu*lt->editlatt->pntsv*lt->editlatt->pntsw);
		
		MEM_freeN(lt->editlatt);
		lt->editlatt= NULL;
	}
}

void make_editLatt(Object *obedit)
{
	Lattice *lt= obedit->data;
	KeyBlock *actkey;
	
	free_editLatt(obedit);
	
	lt= obedit->data;

	actkey= ob_get_keyblock(obedit);
	if(actkey)
		key_to_latt(actkey, lt);

	lt->editlatt= MEM_dupallocN(lt);
	lt->editlatt->def= MEM_dupallocN(lt->def);
	
	if(lt->dvert) {
		int tot= lt->pntsu*lt->pntsv*lt->pntsw;
		lt->editlatt->dvert = MEM_mallocN (sizeof (MDeformVert)*tot, "Lattice MDeformVert");
		copy_dverts(lt->editlatt->dvert, lt->dvert, tot);
	}
}

void load_editLatt(Object *obedit)
{
	Lattice *lt;
	KeyBlock *actkey;
	BPoint *bp;
	float *fp;
	int tot;
	
	lt= obedit->data;
	
	actkey= ob_get_keyblock(obedit);

	if(actkey) {
		/* active key: vertices */
		tot= lt->editlatt->pntsu*lt->editlatt->pntsv*lt->editlatt->pntsw;
		
		if(actkey->data) MEM_freeN(actkey->data);
		
		fp=actkey->data= MEM_callocN(lt->key->elemsize*tot, "actkey->data");
		actkey->totelem= tot;
	
		bp= lt->editlatt->def;
		while(tot--) {
			VECCOPY(fp, bp->vec);
			fp+= 3;
			bp++;
		}
	}
	else {
		MEM_freeN(lt->def);
	
		lt->def= MEM_dupallocN(lt->editlatt->def);

		lt->flag= lt->editlatt->flag;

		lt->pntsu= lt->editlatt->pntsu;
		lt->pntsv= lt->editlatt->pntsv;
		lt->pntsw= lt->editlatt->pntsw;
		
		lt->typeu= lt->editlatt->typeu;
		lt->typev= lt->editlatt->typev;
		lt->typew= lt->editlatt->typew;
	}
	
	if(lt->dvert) {
		free_dverts(lt->dvert, lt->pntsu*lt->pntsv*lt->pntsw);
		lt->dvert= NULL;
	}
	
	if(lt->editlatt->dvert) {
		int tot= lt->pntsu*lt->pntsv*lt->pntsw;
		
		lt->dvert = MEM_mallocN (sizeof (MDeformVert)*tot, "Lattice MDeformVert");
		copy_dverts(lt->dvert, lt->editlatt->dvert, tot);
	}
}

/************************** Operators *************************/

static void setflagsLatt(Object *obedit, int flag)
{
	Lattice *lt= obedit->data;
	BPoint *bp;
	int a;
	
	bp= lt->editlatt->def;
	
	a= lt->editlatt->pntsu*lt->editlatt->pntsv*lt->editlatt->pntsw;
	
	while(a--) {
		if(bp->hide==0) {
			bp->f1= flag;
		}
		bp++;
	}
}

int de_select_all_exec(bContext *C, wmOperator *op)
{
	Object *obedit= CTX_data_edit_object(C);
	Lattice *lt= obedit->data;
	BPoint *bp;
	int a, deselect= 0;
	
	bp= lt->editlatt->def;
	a= lt->editlatt->pntsu*lt->editlatt->pntsv*lt->editlatt->pntsw;
	
	while(a--) {
		if(bp->hide==0) {
			if(bp->f1) {
				deselect= 1;
				break;
			}
		}
		bp++;
	}

	if(deselect)
		setflagsLatt(obedit, 0);
	else
		setflagsLatt(obedit, 1);
	
	WM_event_add_notifier(C, NC_GEOM|ND_SELECT, obedit->data);

	return OPERATOR_FINISHED;
}

void LATTICE_OT_select_all_toggle(wmOperatorType *ot)
{
	/* identifiers */
	ot->name= "Select or Deselect All";
	ot->idname= "LATTICE_OT_select_all_toggle";
	
	/* api callbacks */
	ot->exec= de_select_all_exec;
	ot->poll= ED_operator_editlattice;
	
	/* flags */
	ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
}

int make_regular_poll(bContext *C)
{
	Object *ob;

	if(ED_operator_editlattice(C)) return 1;

	ob= CTX_data_active_object(C);
	return (ob && ob->type==OB_LATTICE);
}

int make_regular_exec(bContext *C, wmOperator *op)
{
	Object *ob= CTX_data_edit_object(C);
	Lattice *lt;
	
	if(ob) {
		lt= ob->data;
		resizelattice(lt->editlatt, lt->pntsu, lt->pntsv, lt->pntsw, NULL);
	}
	else {
		ob= CTX_data_active_object(C);
		lt= ob->data;
		resizelattice(lt, lt->pntsu, lt->pntsv, lt->pntsw, NULL);
	}
	
	DAG_id_flush_update(&ob->id, OB_RECALC_DATA);
	WM_event_add_notifier(C, NC_GEOM|ND_DATA, ob->data);

	return OPERATOR_FINISHED;
}

void LATTICE_OT_make_regular(wmOperatorType *ot)
{
	/* identifiers */
	ot->name= "Make Regular";
	ot->idname= "LATTICE_OT_make_regular";
	
	/* api callbacks */
	ot->exec= make_regular_exec;
	ot->poll= make_regular_poll;
	
	/* flags */
	ot->flag= OPTYPE_REGISTER|OPTYPE_UNDO;
}

/****************************** Mouse Selection *************************/

static void findnearestLattvert__doClosest(void *userData, BPoint *bp, int x, int y)
{
	struct { BPoint *bp; short dist, select, mval[2]; } *data = userData;
	float temp = abs(data->mval[0]-x) + abs(data->mval[1]-y);
	
	if((bp->f1 & SELECT)==data->select)
		temp += 5;

	if(temp<data->dist) {
		data->dist = temp;

		data->bp = bp;
	}
}

static BPoint *findnearestLattvert(ViewContext *vc, short mval[2], int sel)
{
		/* sel==1: selected gets a disadvantage */
		/* in nurb and bezt or bp the nearest is written */
		/* return 0 1 2: handlepunt */
	struct { BPoint *bp; short dist, select, mval[2]; } data = {0};

	data.dist = 100;
	data.select = sel;
	data.mval[0]= mval[0];
	data.mval[1]= mval[1];

	lattice_foreachScreenVert(vc, findnearestLattvert__doClosest, &data);

	return data.bp;
}

void mouse_lattice(bContext *C, short mval[2], int extend)
{
	ViewContext vc;
	BPoint *bp= NULL;

	view3d_set_viewcontext(C, &vc);
	bp= findnearestLattvert(&vc, mval, 1);

	if(bp) {
		if(extend==0) {
			setflagsLatt(vc.obedit, 0);
			bp->f1 |= SELECT;
		}
		else
			bp->f1 ^= SELECT; /* swap */

		WM_event_add_notifier(C, NC_GEOM|ND_SELECT, vc.obedit->data);
	}
}

/******************************** Undo *************************/

typedef struct UndoLattice {
	BPoint *def;
	int pntsu, pntsv, pntsw;
} UndoLattice;

static void undoLatt_to_editLatt(void *data, void *edata)
{
	UndoLattice *ult= (UndoLattice*)data;
	Lattice *editlatt= (Lattice *)edata;
	int a= editlatt->pntsu*editlatt->pntsv*editlatt->pntsw;

	memcpy(editlatt->def, ult->def, a*sizeof(BPoint));
}

static void *editLatt_to_undoLatt(void *edata)
{
	UndoLattice *ult= MEM_callocN(sizeof(UndoLattice), "UndoLattice");
	Lattice *editlatt= (Lattice *)edata;
	
	ult->def= MEM_dupallocN(editlatt->def);
	ult->pntsu= editlatt->pntsu;
	ult->pntsv= editlatt->pntsv;
	ult->pntsw= editlatt->pntsw;
	
	return ult;
}

static void free_undoLatt(void *data)
{
	UndoLattice *ult= (UndoLattice*)data;

	if(ult->def) MEM_freeN(ult->def);
	MEM_freeN(ult);
}

static int validate_undoLatt(void *data, void *edata)
{
	UndoLattice *ult= (UndoLattice*)data;
	Lattice *editlatt= (Lattice *)edata;

	return (ult->pntsu == editlatt->pntsu &&
	        ult->pntsv == editlatt->pntsv &&
	        ult->pntsw == editlatt->pntsw);
}

static void *get_editlatt(bContext *C)
{
	Object *obedit= CTX_data_edit_object(C);

	if(obedit && obedit->type==OB_LATTICE) {
		Lattice *lt= obedit->data;
		return lt->editlatt;
	}

	return NULL;
}

/* and this is all the undo system needs to know */
void undo_push_lattice(bContext *C, char *name)
{
	undo_editmode_push(C, name, get_editlatt, free_undoLatt, undoLatt_to_editLatt, editLatt_to_undoLatt, validate_undoLatt);
}