/**
 * $Id$
 *
 * ***** 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) 2008 Blender Foundation.
 * All rights reserved.
 *
 * 
 * Contributor(s): Blender Foundation
 *
 * ***** END GPL LICENSE BLOCK *****
 */

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

#include "DNA_object_types.h"
#include "DNA_scene_types.h"

#include "MEM_guardedalloc.h"

#include "BLI_blenlib.h"
#include "BLI_dlrbTree.h"

#include "BKE_context.h"
#include "BKE_global.h"
#include "BKE_screen.h"
#include "BKE_pointcache.h"

#include "ED_anim_api.h"
#include "ED_keyframes_draw.h"
#include "ED_screen.h"

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

#include "BIF_gl.h"
#include "BIF_glutil.h"

#include "UI_resources.h"
#include "UI_view2d.h"

#include "ED_markers.h"

#include "time_intern.h"

/* ************************ main time area region *********************** */

static void time_draw_sfra_efra(Scene *scene, View2D *v2d)
{	
	/* draw darkened area outside of active timeline 
	 * frame range used is preview range or scene range */
	UI_ThemeColorShade(TH_BACK, -25);

	if (PSFRA < PEFRA) {
		glRectf(v2d->cur.xmin, v2d->cur.ymin, (float)PSFRA, v2d->cur.ymax);
		glRectf((float)PEFRA, v2d->cur.ymin, v2d->cur.xmax, v2d->cur.ymax);
	}
	else {
		glRectf(v2d->cur.xmin, v2d->cur.ymin, v2d->cur.xmax, v2d->cur.ymax);
	}

	UI_ThemeColorShade(TH_BACK, -60);
	/* thin lines where the actual frames are */
	fdrawline((float)PSFRA, v2d->cur.ymin, (float)PSFRA, v2d->cur.ymax);
	fdrawline((float)PEFRA, v2d->cur.ymin, (float)PEFRA, v2d->cur.ymax);
}

#define CACHE_DRAW_HEIGHT	3.0f

static void time_draw_cache(SpaceTime *stime)
{
	SpaceTimeCache *stc;
	float yoffs=0.f;
	
	if (!(stime->cache_display & TIME_CACHE_DISPLAY))
		return;
	
	for (stc= stime->caches.first; stc; stc=stc->next) {
		float col[4];
		
		if (!stc->array || !stc->ok)
			continue;
		
		glPushMatrix();
		glTranslatef(0.0, (float)V2D_SCROLL_HEIGHT+yoffs, 0.0);
		glScalef(1.0, CACHE_DRAW_HEIGHT, 0.0);
		
		switch(stc->type) {
			case PTCACHE_TYPE_SOFTBODY:
				col[0] = 1.0;	col[1] = 0.4;	col[2] = 0.02;
				col[3] = 0.1;
				break;
			case PTCACHE_TYPE_PARTICLES:
				col[0] = 1.0;	col[1] = 0.1;	col[2] = 0.02;
				col[3] = 0.1;
				break;
			case PTCACHE_TYPE_CLOTH:
				col[0] = 0.1;	col[1] = 0.1;	col[2] = 0.75;
				col[3] = 0.1;
				break;
			case PTCACHE_TYPE_SMOKE_DOMAIN:
			case PTCACHE_TYPE_SMOKE_HIGHRES:
				col[0] = 0.2;	col[1] = 0.2;	col[2] = 0.2;
				col[3] = 0.1;
				break;
		}
		glColor4fv(col);
		
		glEnable(GL_BLEND);
		
		glRectf((float)stc->startframe, 0.0, (float)stc->endframe, 1.0);
		
		col[3] = 0.4;
		if (stc->flag & PTCACHE_BAKED) {
			col[0] -= 0.4;	col[1] -= 0.4;	col[2] -= 0.4;
		}
		glColor4fv(col);
		
		glEnableClientState(GL_VERTEX_ARRAY);
		glVertexPointer(2, GL_FLOAT, 0, stc->array);
		glDrawArrays(GL_QUADS, 0, stc->len);
		glDisableClientState(GL_VERTEX_ARRAY);
		
		glDisable(GL_BLEND);
		
		glPopMatrix();
		
		yoffs += CACHE_DRAW_HEIGHT;
	}
}

static void time_cache_free(SpaceTime *stime)
{
	SpaceTimeCache *stc;
	
	for (stc= stime->caches.first; stc; stc=stc->next) {
		if (stc->array) {
			MEM_freeN(stc->array);
			stc->array = NULL;
		}
	}
	
	BLI_freelistN(&stime->caches);
}

static void time_cache_refresh(const bContext *C, SpaceTime *stime)
{
	Object *ob = CTX_data_active_object(C);
	PTCacheID *pid;
	ListBase pidlist;
	
	time_cache_free(stime);
	
	if (!(stime->cache_display & TIME_CACHE_DISPLAY) || (!ob))
		return;
	
	BKE_ptcache_ids_from_object(&pidlist, ob, NULL, 0);
	
	/* iterate over pointcaches on the active object, 
	 * add spacetimecache and vertex array for each */
	for(pid=pidlist.first; pid; pid=pid->next) {
		SpaceTimeCache *stc;
		float *fp, *array;
		int i, len;
		int sta, end;
		
		switch(pid->type) {
			case PTCACHE_TYPE_SOFTBODY:
				if (!(stime->cache_display & TIME_CACHE_SOFTBODY)) continue;
				break;
			case PTCACHE_TYPE_PARTICLES:
				if (!(stime->cache_display & TIME_CACHE_PARTICLES))	continue;
				break;
			case PTCACHE_TYPE_CLOTH:
				if (!(stime->cache_display & TIME_CACHE_CLOTH))	continue;
				break;
			case PTCACHE_TYPE_SMOKE_DOMAIN:
			case PTCACHE_TYPE_SMOKE_HIGHRES:
				if (!(stime->cache_display & TIME_CACHE_SMOKE))	continue;
				break;
		}

		BKE_ptcache_id_time(pid, CTX_data_scene(C), 0, &sta, &end, NULL);
		
		if(pid->cache->cached_frames==NULL)
			continue;
		
		stc= MEM_callocN(sizeof(SpaceTimeCache), "spacetimecache");
		
		stc->type = pid->type;
		
		if (pid->cache->flag & PTCACHE_BAKED)
			stc->flag |= PTCACHE_BAKED;
		if (pid->cache->flag & PTCACHE_DISK_CACHE)
			stc->flag |= PTCACHE_DISK_CACHE;
		
		/* first allocate with maximum number of frames needed */
		stc->startframe = sta;
		stc->endframe = end;
		len = (end - sta + 1)*4;
		fp = array = MEM_callocN(len*2*sizeof(float), "temporary timeline cache array");
		
		/* fill the vertex array with a quad for each cached frame */
		for (i=sta; i<=end; i++) {
			
			if (pid->cache->cached_frames[i-sta]) {
				fp[0] = (float)i;
				fp[1] = 0.0;
				fp+=2;
				
				fp[0] = (float)i;
				fp[1] = 1.0;
				fp+=2;
				
				fp[0] = (float)(i+1);
				fp[1] = 1.0;
				fp+=2;
				
				fp[0] = (float)(i+1);
				fp[1] = 0.0;
				fp+=2;
			}
		}
		/* update with final number of frames */
		stc->len = (i-stc->startframe)*4;
		stc->array = MEM_mallocN(stc->len*2*sizeof(float), "SpaceTimeCache array");
		memcpy(stc->array, array, stc->len*2*sizeof(float));
		
		MEM_freeN(array);
		array = NULL;
		
		stc->ok = 1;
		
		BLI_addtail(&stime->caches, stc);
	}
	
	/* todo: sort time->caches list for consistent order */
	// ...
	
	BLI_freelistN(&pidlist);
}

/* helper function - find actkeycolumn that occurs on cframe, or the nearest one if not found */
static ActKeyColumn *time_cfra_find_ak (ActKeyColumn *ak, float cframe)
{
	ActKeyColumn *akn= NULL;
	
	/* sanity checks */
	if (ak == NULL)
		return NULL;
	
	/* check if this is a match, or whether it is in some subtree */
	if (cframe < ak->cfra)
		akn= time_cfra_find_ak(ak->left, cframe);
	else if (cframe > ak->cfra)
		akn= time_cfra_find_ak(ak->right, cframe);
		
	/* if no match found (or found match), just use the current one */
	if (akn == NULL)
		return ak;
	else
		return akn;
}

/* helper for time_draw_keyframes() */
static void time_draw_idblock_keyframes(View2D *v2d, ID *id, short onlysel)
{
	bDopeSheet ads;
	DLRBT_Tree keys;
	ActKeyColumn *ak;
	
	/* init binarytree-list for getting keyframes */
	BLI_dlrbTree_init(&keys);
	
	/* init dopesheet settings */
	// FIXME: the ob_to_keylist function currently doesn't take this into account...
	memset(&ads, 0, sizeof(bDopeSheet));
	if (onlysel)
		ads.filterflag |= ADS_FILTER_ONLYSEL;
	
	/* populate tree with keyframe nodes */
	switch (GS(id->name)) {
		case ID_SCE:
			scene_to_keylist(&ads, (Scene *)id, &keys, NULL);
			break;
		case ID_OB:
			ob_to_keylist(&ads, (Object *)id, &keys, NULL);
			break;
	}
		
	/* build linked-list for searching */
	BLI_dlrbTree_linkedlist_sync(&keys);
	
	/* start drawing keyframes 
	 *	- we use the binary-search capabilities of the tree to only start from 
	 *	  the first visible keyframe (last one can then be easily checked)
	 *	- draw within a single GL block to be faster
	 */
	glBegin(GL_LINES);
		for ( ak=time_cfra_find_ak(keys.root, v2d->cur.xmin); 
			 (ak) && (ak->cfra <= v2d->cur.xmax); 
			  ak=ak->next ) 
		{
			glVertex2f(ak->cfra, v2d->cur.ymin);
			glVertex2f(ak->cfra, v2d->cur.ymax);
		}
	glEnd(); // GL_LINES
		
	/* free temp stuff */
	BLI_dlrbTree_free(&keys);
}

/* draw keyframe lines for timeline */
static void time_draw_keyframes(const bContext *C, SpaceTime *stime, ARegion *ar)
{
	Scene *scene= CTX_data_scene(C);
	Object *ob= CTX_data_active_object(C);
	View2D *v2d= &ar->v2d;
	short onlysel= (stime->flag & TIME_ONLYACTSEL);
	
	/* draw scene keyframes first 
	 *	- don't try to do this when only drawing active/selected data keyframes,
	 *	  since this can become quite slow
	 */
	if (scene && onlysel==0) {
		/* set draw color */
		glColor3ub(0xDD, 0xA7, 0x00);
		time_draw_idblock_keyframes(v2d, (ID *)scene, onlysel);
	}
	
	/* draw keyframes from selected objects 
	 *	- only do the active object if in posemode (i.e. showing only keyframes for the bones)
	 *	  OR the onlysel flag was set, which means that only active object's keyframes should
	 *	  be considered
	 */
	glColor3ub(0xDD, 0xD7, 0x00);
	
	if (ob && ((ob->mode == OB_MODE_POSE) || onlysel)) {
		/* draw keyframes for active object only */
		time_draw_idblock_keyframes(v2d, (ID *)ob, onlysel);
	}
	else {
		short active_done = 0;
		
		/* draw keyframes from all selected objects */
		CTX_DATA_BEGIN(C, Object*, obsel, selected_objects) 
		{
			/* last arg is 0, since onlysel doesn't apply here... */
			time_draw_idblock_keyframes(v2d, (ID *)obsel, 0);
			
			/* if this object is the active one, set flag so that we don't draw again */
			if (obsel == ob)
				active_done= 1;
		}
		CTX_DATA_END;
		
		/* if active object hasn't been done yet, draw it... */
		if (ob && (active_done == 0))
			time_draw_idblock_keyframes(v2d, (ID *)ob, 0);
	}
}

/* ---------------- */

static void time_refresh(const bContext *C, ScrArea *sa)
{
	SpaceTime *stime = (SpaceTime *)sa->spacedata.first;
	ARegion *ar;
	
	/* find the main timeline region and refresh cache display*/
	for (ar= sa->regionbase.first; ar; ar= ar->next) {
		if (ar->regiontype==RGN_TYPE_WINDOW) {
			time_cache_refresh(C, stime);
			break;
		}
	}
}

/* editor level listener */
static void time_listener(ScrArea *sa, wmNotifier *wmn)
{

	/* mainly for updating cache display */
	switch (wmn->category) {
		case NC_OBJECT:
			switch (wmn->data) {
				case ND_BONE_ACTIVE:
				case ND_POINTCACHE:
					ED_area_tag_refresh(sa);
					ED_area_tag_redraw(sa);
					break;
			}
			break;
		case NC_SCENE:
			switch (wmn->data) {
				case ND_OB_ACTIVE:
				case ND_FRAME:
					ED_area_tag_refresh(sa);
					break;
				case ND_FRAME_RANGE:
					{
						ARegion *ar;
						Scene *scene = wmn->reference;

						for (ar= sa->regionbase.first; ar; ar= ar->next) {
							if (ar->regiontype==RGN_TYPE_WINDOW) {
								ar->v2d.tot.xmin= (float)(SFRA - 4);
								ar->v2d.tot.xmax= (float)(EFRA + 4);
								break;
							}
						}
					}
					break;
			}
		case NC_SPACE:
			switch (wmn->data) {
				case ND_SPACE_CHANGED:
					ED_area_tag_refresh(sa);
					break;
			}
	}
}

/* ---------------- */

/* add handlers, stuff you only do once or on area/region changes */
static void time_main_area_init(wmWindowManager *wm, ARegion *ar)
{
	wmKeyMap *keymap;
	
	UI_view2d_region_reinit(&ar->v2d, V2D_COMMONVIEW_CUSTOM, ar->winx, ar->winy);
	
	/* own keymap */
	keymap= WM_keymap_find(wm->defaultconf, "Timeline", SPACE_TIME, 0);
	WM_event_add_keymap_handler_bb(&ar->handlers, keymap, &ar->v2d.mask, &ar->winrct);
}

static void time_main_area_draw(const bContext *C, ARegion *ar)
{
	/* draw entirely, view changes should be handled here */
	Scene *scene= CTX_data_scene(C);
	SpaceTime *stime= CTX_wm_space_time(C);
	View2D *v2d= &ar->v2d;
	View2DGrid *grid;
	View2DScrollers *scrollers;
	int unit, flag=0;
	
	/* clear and setup matrix */
	UI_ThemeClearColor(TH_BACK);
	glClear(GL_COLOR_BUFFER_BIT);
	
	UI_view2d_view_ortho(v2d);

	/* start and end frame */
	time_draw_sfra_efra(scene, v2d);
	
	/* grid */
	unit= (stime->flag & TIME_DRAWFRAMES)? V2D_UNIT_FRAMES: V2D_UNIT_SECONDS;
	grid= UI_view2d_grid_calc(scene, v2d, unit, V2D_GRID_CLAMP, V2D_ARG_DUMMY, V2D_ARG_DUMMY, ar->winx, ar->winy);
	UI_view2d_grid_draw(v2d, grid, (V2D_VERTICAL_LINES|V2D_VERTICAL_AXIS));
	UI_view2d_grid_free(grid);
	
	/* keyframes */
	if(!G.rendering) /* ANIM_nla_mapping_apply_fcurve() modifies curve data while rendering, possible race condition */
		time_draw_keyframes(C, stime, ar);
	
	/* current frame */
	if ((stime->flag & TIME_DRAWFRAMES)==0) 	flag |= DRAWCFRA_UNIT_SECONDS;
	if (stime->flag & TIME_CFRA_NUM) 			flag |= DRAWCFRA_SHOW_NUMBOX;
	ANIM_draw_cfra(C, v2d, flag);
	
	/* markers */
	UI_view2d_view_orthoSpecial(ar, v2d, 1);
	draw_markers_time(C, 0);
	
	/* caches */
	time_draw_cache(stime);
	
	/* reset view matrix */
	UI_view2d_view_restore(C);
	
	/* scrollers */
	scrollers= UI_view2d_scrollers_calc(C, v2d, unit, V2D_GRID_CLAMP, V2D_ARG_DUMMY, V2D_ARG_DUMMY);
	UI_view2d_scrollers_draw(C, v2d, scrollers);
	UI_view2d_scrollers_free(scrollers);
}

static void time_main_area_listener(ARegion *ar, wmNotifier *wmn)
{
	/* context changes */
	switch(wmn->category) {
		case NC_SPACE:
			if(wmn->data == ND_SPACE_TIME)
				ED_region_tag_redraw(ar);
			break;

		case NC_ANIMATION:
			ED_region_tag_redraw(ar);
			break;
		
		case NC_SCENE:
			switch (wmn->data) {
				case ND_OB_SELECT:
				case ND_OB_ACTIVE:
				case ND_FRAME:
				case ND_FRAME_RANGE:
				case ND_KEYINGSET:
				case ND_RENDER_OPTIONS:
					ED_region_tag_redraw(ar);
				break;
			}
	}
}

/* ************************ header time area region *********************** */

/* add handlers, stuff you only do once or on area/region changes */
static void time_header_area_init(wmWindowManager *UNUSED(wm), ARegion *ar)
{
	ED_region_header_init(ar);
}

static void time_header_area_draw(const bContext *C, ARegion *ar)
{
	ED_region_header(C, ar);
}

static void time_header_area_listener(ARegion *ar, wmNotifier *wmn)
{
	/* context changes */
	switch(wmn->category) {
		case NC_SCREEN:
			if(wmn->data==ND_ANIMPLAY)
				ED_region_tag_redraw(ar);
			break;

		case NC_SCENE:
			switch (wmn->data) {
				case ND_OB_SELECT:
				case ND_FRAME:
				case ND_FRAME_RANGE:
				case ND_KEYINGSET:
				case ND_RENDER_OPTIONS:
					ED_region_tag_redraw(ar);
				break;
			}

		case NC_SPACE:
			if(wmn->data == ND_SPACE_TIME)
				ED_region_tag_redraw(ar);
			break;
	}
}

/* ******************** default callbacks for time space ***************** */

static SpaceLink *time_new(const bContext *C)
{
	Scene *scene= CTX_data_scene(C);
	ARegion *ar;
	SpaceTime *stime;

	stime= MEM_callocN(sizeof(SpaceTime), "inittime");

	stime->spacetype= SPACE_TIME;
	stime->redraws= TIME_ALL_3D_WIN|TIME_ALL_ANIM_WIN;
	stime->flag |= TIME_DRAWFRAMES;

	/* header */
	ar= MEM_callocN(sizeof(ARegion), "header for time");
	
	BLI_addtail(&stime->regionbase, ar);
	ar->regiontype= RGN_TYPE_HEADER;
	ar->alignment= RGN_ALIGN_BOTTOM;
	
	/* main area */
	ar= MEM_callocN(sizeof(ARegion), "main area for time");
	
	BLI_addtail(&stime->regionbase, ar);
	ar->regiontype= RGN_TYPE_WINDOW;
	
	ar->v2d.tot.xmin= (float)(SFRA - 4);
	ar->v2d.tot.ymin= 0.0f;
	ar->v2d.tot.xmax= (float)(EFRA + 4);
	ar->v2d.tot.ymax= 50.0f;
	
	ar->v2d.cur= ar->v2d.tot;

	ar->v2d.min[0]= 1.0f;
	ar->v2d.min[1]= 50.0f;

	ar->v2d.max[0]= MAXFRAMEF;
	ar->v2d.max[1]= 50.0; 

	ar->v2d.minzoom= 0.1f;
	ar->v2d.maxzoom= 10.0;

	ar->v2d.scroll |= (V2D_SCROLL_BOTTOM|V2D_SCROLL_SCALE_HORIZONTAL);
	ar->v2d.align |= V2D_ALIGN_NO_NEG_Y;
	ar->v2d.keepofs |= V2D_LOCKOFS_Y;
	ar->v2d.keepzoom |= V2D_LOCKZOOM_Y;


	return (SpaceLink*)stime;
}

/* not spacelink itself */
static void time_free(SpaceLink *sl)
{
	SpaceTime *stime= (SpaceTime *)sl;
	
	time_cache_free(stime);
}
/* spacetype; init callback in ED_area_initialize() */
/* init is called to (re)initialize an existing editor (file read, screen changes) */
/* validate spacedata, add own area level handlers */
static void time_init(wmWindowManager *UNUSED(wm), ScrArea *sa)
{
	SpaceTime *stime= (SpaceTime *)sa->spacedata.first;
	
	time_cache_free(stime);
	
	/* enable all cache display */
	stime->cache_display |= TIME_CACHE_DISPLAY;
	stime->cache_display |= (TIME_CACHE_SOFTBODY|TIME_CACHE_PARTICLES);
	stime->cache_display |= (TIME_CACHE_CLOTH|TIME_CACHE_SMOKE);
}

static SpaceLink *time_duplicate(SpaceLink *sl)
{
	SpaceTime *stime= (SpaceTime *)sl;
	SpaceTime *stimen= MEM_dupallocN(stime);
	
	time_cache_free(stimen);
	
	return (SpaceLink *)stimen;
}

/* only called once, from space_api/spacetypes.c */
/* it defines all callbacks to maintain spaces */
void ED_spacetype_time(void)
{
	SpaceType *st= MEM_callocN(sizeof(SpaceType), "spacetype time");
	ARegionType *art;
	
	st->spaceid= SPACE_TIME;
	strncpy(st->name, "Timeline", BKE_ST_MAXNAME);
	
	st->new= time_new;
	st->free= time_free;
	st->init= time_init;
	st->duplicate= time_duplicate;
	st->operatortypes= time_operatortypes;
	st->keymap= NULL;
	st->listener= time_listener;
	st->refresh= time_refresh;
	
	/* regions: main window */
	art= MEM_callocN(sizeof(ARegionType), "spacetype time region");
	art->regionid = RGN_TYPE_WINDOW;
	art->keymapflag= ED_KEYMAP_VIEW2D|ED_KEYMAP_MARKERS|ED_KEYMAP_ANIMATION|ED_KEYMAP_FRAMES;
	
	art->init= time_main_area_init;
	art->draw= time_main_area_draw;
	art->listener= time_main_area_listener;
	art->keymap= time_keymap;
	BLI_addhead(&st->regiontypes, art);
	
	/* regions: header */
	art= MEM_callocN(sizeof(ARegionType), "spacetype time region");
	art->regionid = RGN_TYPE_HEADER;
	art->prefsizey= HEADERY;
	art->keymapflag= ED_KEYMAP_UI|ED_KEYMAP_VIEW2D|ED_KEYMAP_FRAMES|ED_KEYMAP_HEADER;
	
	art->init= time_header_area_init;
	art->draw= time_header_area_draw;
	art->listener= time_header_area_listener;
	BLI_addhead(&st->regiontypes, art);
		
	BKE_spacetype_register(st);
}