/* 
 * $Id$
 *
 * ***** 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., 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.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file blender/blenkernel/intern/screen.c
 *  \ingroup bke
 */

#include "BLI_winstuff.h"

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

#include "MEM_guardedalloc.h"

#include "DNA_scene_types.h"
#include "DNA_screen_types.h"
#include "DNA_space_types.h"
#include "DNA_view3d_types.h"

#include "BLI_blenlib.h"

#include "BKE_screen.h"

/* ************ Spacetype/regiontype handling ************** */

/* keep global; this has to be accessible outside of windowmanager */
static ListBase spacetypes= {NULL, NULL};

/* not SpaceType itself */
static void spacetype_free(SpaceType *st)
{
	ARegionType *art;
	PanelType *pt;
	HeaderType *ht;
	
	for(art= st->regiontypes.first; art; art= art->next) {
		BLI_freelistN(&art->drawcalls);

		for(pt= art->paneltypes.first; pt; pt= pt->next)
			if(pt->ext.free)
				pt->ext.free(pt->ext.data);

		for(ht= art->headertypes.first; ht; ht= ht->next)
			if(ht->ext.free)
				ht->ext.free(ht->ext.data);

		BLI_freelistN(&art->paneltypes);
		BLI_freelistN(&art->headertypes);
	}
	
	BLI_freelistN(&st->regiontypes);
	BLI_freelistN(&st->toolshelf);

}

void BKE_spacetypes_free(void)
{
	SpaceType *st;
	
	for(st= spacetypes.first; st; st= st->next) {
		spacetype_free(st);
	}
	
	BLI_freelistN(&spacetypes);
}

SpaceType *BKE_spacetype_from_id(int spaceid)
{
	SpaceType *st;
	
	for(st= spacetypes.first; st; st= st->next) {
		if(st->spaceid==spaceid)
			return st;
	}
	return NULL;
}

ARegionType *BKE_regiontype_from_id(SpaceType *st, int regionid)
{
	ARegionType *art;
	
	for(art= st->regiontypes.first; art; art= art->next)
		if(art->regionid==regionid)
			return art;
	
	printf("Error, region type missing in - name:\"%s\", id:%d\n", st->name, st->spaceid);
	return st->regiontypes.first;
}


const ListBase *BKE_spacetypes_list(void)
{
	return &spacetypes;
}

void BKE_spacetype_register(SpaceType *st)
{
	SpaceType *stype;
	
	/* sanity check */
	stype= BKE_spacetype_from_id(st->spaceid);
	if(stype) {
		printf("error: redefinition of spacetype %s\n", stype->name);
		spacetype_free(stype);
		MEM_freeN(stype);
	}
	
	BLI_addtail(&spacetypes, st);
}

/* ***************** Space handling ********************** */

void BKE_spacedata_freelist(ListBase *lb)
{
	SpaceLink *sl;
	ARegion *ar;
	
	for (sl= lb->first; sl; sl= sl->next) {
		SpaceType *st= BKE_spacetype_from_id(sl->spacetype);
		
		/* free regions for pushed spaces */
		for(ar=sl->regionbase.first; ar; ar=ar->next)
			BKE_area_region_free(st, ar);

		BLI_freelistN(&sl->regionbase);
		
		if(st && st->free) 
			st->free(sl);
	}
	
	BLI_freelistN(lb);
}

ARegion *BKE_area_region_copy(SpaceType *st, ARegion *ar)
{
	ARegion *newar= MEM_dupallocN(ar);
	Panel *pa, *newpa, *patab;
	
	newar->prev= newar->next= NULL;
	newar->handlers.first= newar->handlers.last= NULL;
	newar->uiblocks.first= newar->uiblocks.last= NULL;
	newar->swinid= 0;
	
	/* use optional regiondata callback */
	if(ar->regiondata) {
		ARegionType *art= BKE_regiontype_from_id(st, ar->regiontype);

		if(art && art->duplicate)
			newar->regiondata= art->duplicate(ar->regiondata);
		else
			newar->regiondata= MEM_dupallocN(ar->regiondata);
	}

	if(ar->v2d.tab_offset)
		newar->v2d.tab_offset= MEM_dupallocN(ar->v2d.tab_offset);
	
	newar->panels.first= newar->panels.last= NULL;
	BLI_duplicatelist(&newar->panels, &ar->panels);
	
	/* copy panel pointers */
	for(newpa= newar->panels.first; newpa; newpa= newpa->next) {
		patab= newar->panels.first;
		pa= ar->panels.first;
		while(patab) {
			if(newpa->paneltab == pa) {
				newpa->paneltab = patab;
				break;
			}
			patab= patab->next;
			pa= pa->next;
		}
	}
	
	return newar;
}


/* from lb2 to lb1, lb1 is supposed to be free'd */
static void region_copylist(SpaceType *st, ListBase *lb1, ListBase *lb2)
{
	ARegion *ar;
	
	/* to be sure */
	lb1->first= lb1->last= NULL;
	
	for(ar= lb2->first; ar; ar= ar->next) {
		ARegion *arnew= BKE_area_region_copy(st, ar);
		BLI_addtail(lb1, arnew);
	}
}


/* lb1 should be empty */
void BKE_spacedata_copylist(ListBase *lb1, ListBase *lb2)
{
	SpaceLink *sl;
	
	lb1->first= lb1->last= NULL;	/* to be sure */
	
	for (sl= lb2->first; sl; sl= sl->next) {
		SpaceType *st= BKE_spacetype_from_id(sl->spacetype);
		
		if(st && st->duplicate) {
			SpaceLink *slnew= st->duplicate(sl);
			
			BLI_addtail(lb1, slnew);
			
			region_copylist(st, &slnew->regionbase, &sl->regionbase);
		}
	}
}

/* facility to set locks for drawing to survive (render) threads accessing drawing data */
/* lock can become bitflag too */
/* should be replaced in future by better local data handling for threads */
void BKE_spacedata_draw_locks(int set)
{
	SpaceType *st;
	
	for(st= spacetypes.first; st; st= st->next) {
		ARegionType *art;
	
		for(art= st->regiontypes.first; art; art= art->next) {
			if(set) 
				art->do_lock= art->lock;
			else 
				art->do_lock= 0;
		}
	}
}


/* not region itself */
void BKE_area_region_free(SpaceType *st, ARegion *ar)
{
	if(st) {
		ARegionType *art= BKE_regiontype_from_id(st, ar->regiontype);
		
		if(art && art->free)
			art->free(ar);
		
		if(ar->regiondata)
			printf("regiondata free error\n");
	}
	else if(ar->type && ar->type->free)
		ar->type->free(ar);
	
	if(ar->v2d.tab_offset) {
		MEM_freeN(ar->v2d.tab_offset);
		ar->v2d.tab_offset= NULL;
	}

	if(ar)
		BLI_freelistN(&ar->panels);
}

/* not area itself */
void BKE_screen_area_free(ScrArea *sa)
{
	SpaceType *st= BKE_spacetype_from_id(sa->spacetype);
	ARegion *ar;
	
	for(ar=sa->regionbase.first; ar; ar=ar->next)
		BKE_area_region_free(st, ar);

	BLI_freelistN(&sa->regionbase);
	
	BKE_spacedata_freelist(&sa->spacedata);
	
	BLI_freelistN(&sa->actionzones);
}

/* don't free screen itself */
void free_screen(bScreen *sc)
{
	ScrArea *sa, *san;
	ARegion *ar;
	
	for(ar=sc->regionbase.first; ar; ar=ar->next)
		BKE_area_region_free(NULL, ar);

	BLI_freelistN(&sc->regionbase);
	
	for(sa= sc->areabase.first; sa; sa= san) {
		san= sa->next;
		BKE_screen_area_free(sa);
	}
	
	BLI_freelistN(&sc->vertbase);
	BLI_freelistN(&sc->edgebase);
	BLI_freelistN(&sc->areabase);
}

/* for depsgraph */
unsigned int BKE_screen_visible_layers(bScreen *screen, Scene *scene)
{
	ScrArea *sa;
	unsigned int layer= 0;

	if(screen) {
		/* get all used view3d layers */
		for(sa= screen->areabase.first; sa; sa= sa->next)
			if(sa->spacetype==SPACE_VIEW3D)
				layer |= ((View3D *)sa->spacedata.first)->lay;
	}

	if(!layer)
		return scene->lay;

	return layer;
}

/* ***************** Utilities ********************** */

/* Find a region of the specified type from the given area */
ARegion *BKE_area_find_region_type(ScrArea *sa, int type)
{
	if (sa) {
		ARegion *ar;
		
		for (ar=sa->regionbase.first; ar; ar= ar->next) {
			if (ar->regiontype == type)
				return ar;
		}
	}
	return NULL;
}

void BKE_screen_view3d_sync(struct View3D *v3d, struct Scene *scene)
{
	int bit;

	if(v3d->scenelock && v3d->localvd==NULL) {
		v3d->lay= scene->lay;
		v3d->camera= scene->camera;

		if(v3d->camera==NULL) {
			ARegion *ar;

			for(ar=v3d->regionbase.first; ar; ar= ar->next) {
				if(ar->regiontype == RGN_TYPE_WINDOW) {
					RegionView3D *rv3d= ar->regiondata;
					if(rv3d->persp==RV3D_CAMOB)
						rv3d->persp= RV3D_PERSP;
				}
			}
		}

		if((v3d->lay & v3d->layact) == 0) {
			for(bit= 0; bit<32; bit++) {
				if(v3d->lay & (1<<bit)) {
					v3d->layact= 1<<bit;
					break;
				}
			}
		}
	}
}

void BKE_screen_view3d_scene_sync(bScreen *sc)
{
	/* are there cameras in the views that are not in the scene? */
	ScrArea *sa;
	for(sa= sc->areabase.first; sa; sa= sa->next) {
		SpaceLink *sl;
		for(sl= sa->spacedata.first; sl; sl= sl->next) {
			if(sl->spacetype==SPACE_VIEW3D) {
				View3D *v3d= (View3D*) sl;
				BKE_screen_view3d_sync(v3d, sc->scene);
			}
		}
	}
}

void BKE_screen_view3d_main_sync(ListBase *screen_lb, Scene *scene)
{
	bScreen *sc;
	ScrArea *sa;
	SpaceLink *sl;

	/* from scene copy to the other views */
	for(sc=screen_lb->first; sc; sc=sc->id.next) {
		if(sc->scene!=scene)
			continue;

		for(sa=sc->areabase.first; sa; sa=sa->next)
			for(sl=sa->spacedata.first; sl; sl=sl->next)
				if(sl->spacetype==SPACE_VIEW3D)
					BKE_screen_view3d_sync((View3D*)sl, scene);
	}
}

/* magic zoom calculation, no idea what
 * it signifies, if you find out, tell me! -zr
 */

/* simple, its magic dude!
 * well, to be honest, this gives a natural feeling zooming
 * with multiple keypad presses (ton)
 */
float BKE_screen_view3d_zoom_to_fac(float camzoom)
{
	return powf(((float)M_SQRT2 + camzoom/50.0f), 2.0f) / 4.0f;
}

float BKE_screen_view3d_zoom_from_fac(float zoomfac)
{
	return ((sqrtf(4.0f * zoomfac) - (float)M_SQRT2) * 50.0f);
}
