/*
 * ***** 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): Joshua Leung
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file ED_anim_api.h
 *  \ingroup editors
 */

#ifndef __ED_ANIM_API_H__
#define __ED_ANIM_API_H__

struct ID;
struct ListBase;
struct AnimData;

struct bContext;
struct wmKeyConfig;
struct ReportList;
struct ScrArea;
struct SpaceLink;
struct ARegion;
struct View2D;

struct Scene;
struct Object;

struct bDopeSheet;

struct bAction;
struct FCurve;
struct FModifier;

struct uiBlock;
struct uiLayout;

struct PointerRNA;
struct PropertyRNA;

/* ************************************************ */
/* ANIMATION CHANNEL FILTERING */
/* anim_filter.c */

/* --------------- Context --------------------- */

/* This struct defines a structure used for animation-specific 
 * 'context' information
 */
typedef struct bAnimContext {
	void *data;             /* data to be filtered for use in animation editor */
	short datatype;         /* type of data eAnimCont_Types */
	
	short mode;             /* editor->mode */
	short spacetype;        /* sa->spacetype */
	short regiontype;       /* active region -> type (channels or main) */
	
	struct ScrArea *sa;     /* editor host */
	struct SpaceLink *sl;   /* editor data */
	struct ARegion *ar;     /* region within editor */
	
	struct bDopeSheet *ads; /* dopesheet data for editor (or which is being used) */
	
	struct Depsgraph *depsgraph; /* active dependency graph */
	struct Scene *scene;    /* active scene */
	struct ViewLayer *view_layer; /* active scene layer */
	struct Object *obact;   /* active object */
	ListBase *markers;      /* active set of markers */
	
	struct ReportList *reports; /* pointer to current reports list */
	
	float yscale_fac;       /* scale factor for height of channels (i.e. based on the size of keyframes) */
} bAnimContext;

/* Main Data container types */
typedef enum eAnimCont_Types {
	ANIMCONT_NONE      = 0, /* invalid or no data */
	ANIMCONT_ACTION    = 1, /* action (bAction) */
	ANIMCONT_SHAPEKEY  = 2, /* shapekey (Key) */
	ANIMCONT_GPENCIL   = 3, /* grease pencil (screen) */
	ANIMCONT_DOPESHEET = 4, /* dopesheet (bDopesheet) */
	ANIMCONT_FCURVES   = 5, /* animation F-Curves (bDopesheet) */
	ANIMCONT_DRIVERS   = 6, /* drivers (bDopesheet) */
	ANIMCONT_NLA       = 7, /* nla (bDopesheet) */
	ANIMCONT_CHANNEL   = 8, /* animation channel (bAnimListElem) */
	ANIMCONT_MASK      = 9, /* mask dopesheet */
	ANIMCONT_TIMELINE  = 10, /* "timeline" editor (bDopeSheet) */
} eAnimCont_Types;

/* --------------- Channels -------------------- */

/* This struct defines a structure used for quick and uniform access for 
 * channels of animation data
 */
typedef struct bAnimListElem {
	struct bAnimListElem *next, *prev;
	
	void    *data;          /* source data this elem represents */
	int     type;           /* (eAnim_ChannelType) one of the ANIMTYPE_* values */
	int     flag;           /* copy of elem's flags for quick access */
	int     index;          /* for un-named data, the index of the data in its collection */
	
	char    update;         /* (eAnim_Update_Flags)  tag the element for updating */
	char    tag;            /* tag the included data. Temporary always */

	short   datatype;       /* (eAnim_KeyType) type of motion data to expect */
	void   *key_data;       /* motion data - mostly F-Curves, but can be other types too */
	
	
	/* NOTE: id here is the "IdAdtTemplate"-style datablock (e.g. Object, Material, Texture, NodeTree)
	 *       from which evaluation of the RNA-paths takes place. It's used to figure out how deep
	 *       channels should be nested (e.g. for Textures/NodeTrees) in the tree, and allows property
	 *       lookups (e.g. for sliders and for inserting keyframes) to work. If we had instead used
	 *       bAction or something similar, none of this would be possible: although it's trivial
	 *       to use an IdAdtTemplate type to find the source action a channel (e.g. F-Curve) comes from
	 *       (i.e. in the AnimEditors, it *must* be the active action, as only that can be edited),
	 *       it's impossible to go the other way (i.e. one action may be used in multiple places).
	 */
	struct ID *id;          /* ID block that channel is attached to */
	struct AnimData *adt;   /* source of the animation data attached to ID block (for convenience) */
	
	void   *owner;          /* for per-element F-Curves (e.g. NLA Control Curves), the element that this represents (e.g. NlaStrip) */
} bAnimListElem;


/* Some types for easier type-testing 
 * NOTE: need to keep the order of these synchronized with the channels define code
 *      which is used for drawing and handling channel lists for
 */
typedef enum eAnim_ChannelType {
	ANIMTYPE_NONE = 0,
	ANIMTYPE_ANIMDATA,
	ANIMTYPE_SPECIALDATA,
	
	ANIMTYPE_SUMMARY,
	
	ANIMTYPE_SCENE,
	ANIMTYPE_OBJECT,
	ANIMTYPE_GROUP,
	ANIMTYPE_FCURVE,
	
	ANIMTYPE_NLACONTROLS,
	ANIMTYPE_NLACURVE,
	
	ANIMTYPE_FILLACTD,
	ANIMTYPE_FILLDRIVERS,
	
	ANIMTYPE_DSMAT,
	ANIMTYPE_DSLAM,
	ANIMTYPE_DSCAM,
	ANIMTYPE_DSCACHEFILE,
	ANIMTYPE_DSCUR,
	ANIMTYPE_DSSKEY,
	ANIMTYPE_DSWOR,
	ANIMTYPE_DSNTREE,
	ANIMTYPE_DSPART,
	ANIMTYPE_DSMBALL,
	ANIMTYPE_DSARM,
	ANIMTYPE_DSMESH,
	ANIMTYPE_DSTEX,
	ANIMTYPE_DSLAT,
	ANIMTYPE_DSLINESTYLE,
	ANIMTYPE_DSSPK,
	ANIMTYPE_DSGPENCIL,
	ANIMTYPE_DSMCLIP,
	
	ANIMTYPE_SHAPEKEY,
	
	ANIMTYPE_GPDATABLOCK,
	ANIMTYPE_GPLAYER,
	
	ANIMTYPE_MASKDATABLOCK,
	ANIMTYPE_MASKLAYER,
	
	ANIMTYPE_NLATRACK,
	ANIMTYPE_NLAACTION,
	
	/* always as last item, the total number of channel types... */
	ANIMTYPE_NUM_TYPES
} eAnim_ChannelType;

/* types of keyframe data in bAnimListElem */
typedef enum eAnim_KeyType {
	ALE_NONE = 0,       /* no keyframe data */
	ALE_FCURVE,         /* F-Curve */
	ALE_GPFRAME,        /* Grease Pencil Frames */
	ALE_MASKLAY,        /* Mask */
	ALE_NLASTRIP,       /* NLA Strips */

	ALE_ALL,            /* All channels summary */
	ALE_SCE,            /* Scene summary */
	ALE_OB,             /* Object summary */
	ALE_ACT,            /* Action summary */
	ALE_GROUP           /* Action Group summary */
} eAnim_KeyType;

/* Flags for specifying the types of updates (i.e. recalculation/refreshing) that
 * needs to be performed to the data contained in a channel following editing.
 * For use with ANIM_animdata_update()
 */
typedef enum eAnim_Update_Flags {
	ANIM_UPDATE_DEPS        = (1 << 0),  /* referenced data and dependencies get refreshed */
	ANIM_UPDATE_ORDER       = (1 << 1),  /* keyframes need to be sorted */
	ANIM_UPDATE_HANDLES     = (1 << 2),  /* recalculate handles */
} eAnim_Update_Flags;

/* used for most tools which change keyframes (flushed by ANIM_animdata_update) */
#define ANIM_UPDATE_DEFAULT (ANIM_UPDATE_DEPS | ANIM_UPDATE_ORDER | ANIM_UPDATE_HANDLES)
#define ANIM_UPDATE_DEFAULT_NOHANDLES (ANIM_UPDATE_DEFAULT & ~ANIM_UPDATE_HANDLES)

/* ----------------- Filtering -------------------- */

/* filtering flags  - under what circumstances should a channel be returned */
typedef enum eAnimFilter_Flags {
	/* data which channel represents is fits the dopesheet filters (i.e. scene visibility criteria) */
	// XXX: it's hard to think of any examples where this *ISN'T* the case... perhaps becomes implicit?
	ANIMFILTER_DATA_VISIBLE   = (1 << 0),
	/* channel is visible within the channel-list hierarchy (i.e. F-Curves within Groups in ActEdit) */
	ANIMFILTER_LIST_VISIBLE   = (1 << 1),
	/* channel has specifically been tagged as visible in Graph Editor (* Graph Editor Only) */
	ANIMFILTER_CURVE_VISIBLE  = (1 << 2),
	
	/* include summary channels and "expanders" (for drawing/mouse-selection in channel list) */
	ANIMFILTER_LIST_CHANNELS  = (1 << 3),
	
	/* for its type, channel should be "active" one */
	ANIMFILTER_ACTIVE         = (1 << 4),
	/* channel is a child of the active group (* Actions speciality) */
	ANIMFILTER_ACTGROUPED     = (1 << 5),
	
	/* channel must be selected/not-selected, but both must not be set together */
	ANIMFILTER_SEL            = (1 << 6),
	ANIMFILTER_UNSEL          = (1 << 7),
	
	/* editability status - must be editable to be included */
	ANIMFILTER_FOREDIT        = (1 << 8),
	/* only selected animchannels should be considerable as editable - mainly for Graph Editor's option for keys on select curves only */
	ANIMFILTER_SELEDIT        = (1 << 9),
	
	/* flags used to enforce certain data types */
	// NOTE: the ones for curves and NLA tracks were redundant and have been removed for now...
	ANIMFILTER_ANIMDATA       = (1 << 10),
	
	/* duplicate entries for animation data attached to multi-user blocks must not occur */
	ANIMFILTER_NODUPLIS       = (1 << 11),
	
	/* for checking if we should keep some collapsed channel around (internal use only!) */
	ANIMFILTER_TMP_PEEK       = (1 << 30),

	/* ignore ONLYSEL flag from filterflag, (internal use only!) */
	ANIMFILTER_TMP_IGNORE_ONLYSEL = (1u << 31)
} eAnimFilter_Flags;

/* ---------- Flag Checking Macros ------------ */
// xxx check on all of these flags again...

/* Dopesheet only */
/* 'Scene' channels */
#define SEL_SCEC(sce) (CHECK_TYPE_INLINE(sce, Scene *), ((sce->flag & SCE_DS_SELECTED)))
#define EXPANDED_SCEC(sce) (CHECK_TYPE_INLINE(sce, Scene *), ((sce->flag & SCE_DS_COLLAPSED) == 0))
/* 'Sub-Scene' channels (flags stored in Data block) */
#define FILTER_WOR_SCED(wo) (CHECK_TYPE_INLINE(wo, World *), (wo->flag & WO_DS_EXPAND))
#define FILTER_LS_SCED(linestyle) ((linestyle->flag & LS_DS_EXPAND))
/* 'Object' channels */
#define SEL_OBJC(base)          (CHECK_TYPE_INLINE(base, Base *), ((base->flag & SELECT)))
#define EXPANDED_OBJC(ob)       (CHECK_TYPE_INLINE(ob, Object *), ((ob->nlaflag & OB_ADS_COLLAPSED) == 0))
/* 'Sub-object' channels (flags stored in Data block) */
#define FILTER_SKE_OBJD(key)    (CHECK_TYPE_INLINE(key, Key *), ((key->flag & KEY_DS_EXPAND)))
#define FILTER_MAT_OBJD(ma)     (CHECK_TYPE_INLINE(ma, Material *), ((ma->flag & MA_DS_EXPAND)))
#define FILTER_LAM_OBJD(la)     (CHECK_TYPE_INLINE(la, Lamp *), ((la->flag & LA_DS_EXPAND)))
#define FILTER_CAM_OBJD(ca)     (CHECK_TYPE_INLINE(ca, Camera *), ((ca->flag & CAM_DS_EXPAND)))
#define FILTER_CACHEFILE_OBJD(cf)     (CHECK_TYPE_INLINE(cf, CacheFile *), ((cf->flag & CACHEFILE_DS_EXPAND)))
#define FILTER_CUR_OBJD(cu)     (CHECK_TYPE_INLINE(cu, Curve *), ((cu->flag & CU_DS_EXPAND)))
#define FILTER_PART_OBJD(part)  (CHECK_TYPE_INLINE(part, ParticleSettings *), ((part->flag & PART_DS_EXPAND)))
#define FILTER_MBALL_OBJD(mb)   (CHECK_TYPE_INLINE(mb, MetaBall *), ((mb->flag2 & MB_DS_EXPAND)))
#define FILTER_ARM_OBJD(arm)    (CHECK_TYPE_INLINE(arm, bArmature *), ((arm->flag & ARM_DS_EXPAND)))
#define FILTER_MESH_OBJD(me)    (CHECK_TYPE_INLINE(me, Mesh *), ((me->flag & ME_DS_EXPAND)))
#define FILTER_LATTICE_OBJD(lt) (CHECK_TYPE_INLINE(lt, Lattice *), ((lt->flag & LT_DS_EXPAND)))
#define FILTER_SPK_OBJD(spk)    (CHECK_TYPE_INLINE(spk, Speaker *), ((spk->flag & SPK_DS_EXPAND)))
/* Variable use expanders */
#define FILTER_NTREE_DATA(ntree) (CHECK_TYPE_INLINE(ntree, bNodeTree *), ((ntree->flag & NTREE_DS_EXPAND)))
#define FILTER_TEX_DATA(tex)     (CHECK_TYPE_INLINE(tex, Tex *), ((tex->flag & TEX_DS_EXPAND)))

/* 'Sub-object/Action' channels (flags stored in Action) */
#define SEL_ACTC(actc) ((actc->flag & ACT_SELECTED))
#define EXPANDED_ACTC(actc) ((actc->flag & ACT_COLLAPSED) == 0)
/* 'Sub-AnimData' channels */
#define EXPANDED_DRVD(adt) ((adt->flag & ADT_DRIVERS_COLLAPSED) == 0)


/* Actions (also used for Dopesheet) */
/* Action Channel Group */
#define EDITABLE_AGRP(agrp) ((agrp->flag & AGRP_PROTECTED) == 0)
#define EXPANDED_AGRP(ac, agrp) \
	( ((!(ac) || ((ac)->spacetype != SPACE_IPO)) && (agrp->flag & AGRP_EXPANDED)) || \
	  (( (ac) && ((ac)->spacetype == SPACE_IPO)) && (agrp->flag & AGRP_EXPANDED_G)) )
#define SEL_AGRP(agrp) ((agrp->flag & AGRP_SELECTED) || (agrp->flag & AGRP_ACTIVE))
/* F-Curve Channels */
#define EDITABLE_FCU(fcu) ((fcu->flag & FCURVE_PROTECTED) == 0)
#define SEL_FCU(fcu) (fcu->flag & FCURVE_SELECTED)

/* ShapeKey mode only */
#define EDITABLE_SHAPEKEY(kb) ((kb->flag & KEYBLOCK_LOCKED) == 0)
#define SEL_SHAPEKEY(kb) (kb->flag & KEYBLOCK_SEL)

/* Grease Pencil only */
/* Grease Pencil datablock settings */
#define EXPANDED_GPD(gpd) (gpd->flag & GP_DATA_EXPAND) 
/* Grease Pencil Layer settings */
#define EDITABLE_GPL(gpl) ((gpl->flag & GP_LAYER_LOCKED) == 0)
#define SEL_GPL(gpl) (gpl->flag & GP_LAYER_SELECT)

/* Mask Only */
/* Grease Pencil datablock settings */
#define EXPANDED_MASK(mask) (mask->flag & MASK_ANIMF_EXPAND)
/* Grease Pencil Layer settings */
#define EDITABLE_MASK(masklay) ((masklay->flag & MASK_LAYERFLAG_LOCKED) == 0)
#define SEL_MASKLAY(masklay) (masklay->flag & SELECT)


/* NLA only */
#define SEL_NLT(nlt) (nlt->flag & NLATRACK_SELECTED)
#define EDITABLE_NLT(nlt) ((nlt->flag & NLATRACK_PROTECTED) == 0)

/* Movie clip only */
#define EXPANDED_MCLIP(clip) (clip->flag & MCLIP_DATA_EXPAND)

/* AnimData - NLA mostly... */
#define SEL_ANIMDATA(adt) (adt->flag & ADT_UI_SELECTED)

/* -------------- Channel Defines -------------- */

/* channel heights */
#define ACHANNEL_FIRST(ac)          (-0.8f * (ac)->yscale_fac * U.widget_unit)
#define ACHANNEL_HEIGHT(ac)         (0.8f * (ac)->yscale_fac * U.widget_unit)
#define ACHANNEL_HEIGHT_HALF(ac)    (0.4f * (ac)->yscale_fac * U.widget_unit)
#define ACHANNEL_SKIP               (0.1f * U.widget_unit)
#define ACHANNEL_STEP(ac)           (ACHANNEL_HEIGHT(ac) + ACHANNEL_SKIP)

/* channel widths */
#define ACHANNEL_NAMEWIDTH      (10 * U.widget_unit)

/* channel toggle-buttons */
#define ACHANNEL_BUTTON_WIDTH   (0.8f * U.widget_unit)


/* -------------- NLA Channel Defines -------------- */

/* NLA channel heights */
#define NLACHANNEL_FIRST                (-0.8f * U.widget_unit)
#define NLACHANNEL_HEIGHT(snla)         ((snla && (snla->flag & SNLA_NOSTRIPCURVES)) ? (0.8f * U.widget_unit) : (1.2f * U.widget_unit))
#define NLACHANNEL_HEIGHT_HALF(snla)    ((snla && (snla->flag & SNLA_NOSTRIPCURVES)) ? (0.4f * U.widget_unit) : (0.6f * U.widget_unit))
#define NLACHANNEL_SKIP                 (0.1f * U.widget_unit)
#define NLACHANNEL_STEP(snla)           (NLACHANNEL_HEIGHT(snla) + NLACHANNEL_SKIP)

/* channel widths */
#define NLACHANNEL_NAMEWIDTH			(10 * U.widget_unit)

/* channel toggle-buttons */
#define NLACHANNEL_BUTTON_WIDTH			(0.8f * U.widget_unit)

/* ---------------- API  -------------------- */

/* Obtain list of filtered Animation channels to operate on.
 * Returns the number of channels in the list
 */
size_t ANIM_animdata_filter(bAnimContext *ac, ListBase *anim_data, eAnimFilter_Flags filter_mode, void *data, eAnimCont_Types datatype);

/* Obtain current anim-data context from Blender Context info.
 * Returns whether the operation was successful.
 */
bool ANIM_animdata_get_context(const struct bContext *C, bAnimContext *ac);

/* Obtain current anim-data context (from Animation Editor) given 
 * that Blender Context info has already been set.
 * Returns whether the operation was successful.
 */
bool ANIM_animdata_context_getdata(bAnimContext *ac);

/* Acts on bAnimListElem eAnim_Update_Flags */
void ANIM_animdata_update(bAnimContext *ac, ListBase *anim_data);

void ANIM_animdata_freelist(ListBase *anim_data);

/* ************************************************ */
/* ANIMATION CHANNELS LIST */
/* anim_channels_*.c */

/* ------------------------ Drawing TypeInfo -------------------------- */

/* role or level of animchannel in the hierarchy */
typedef enum eAnimChannel_Role {
	ACHANNEL_ROLE_EXPANDER = -1,    /* datablock expander - a "composite" channel type */
	ACHANNEL_ROLE_SPECIAL  = 0,     /* special purposes - not generally for hierarchy processing */
	ACHANNEL_ROLE_CHANNEL  = 1      /* data channel - a channel representing one of the actual building blocks of channels */
} eAnimChannel_Role;

/* flag-setting behavior */
typedef enum eAnimChannels_SetFlag {
	ACHANNEL_SETFLAG_CLEAR  = 0,     /* turn off */
	ACHANNEL_SETFLAG_ADD    = 1,     /* turn on */
	ACHANNEL_SETFLAG_INVERT = 2,     /* on->off, off->on */
	ACHANNEL_SETFLAG_TOGGLE = 3      /* some on -> all off // all on */
} eAnimChannels_SetFlag;

/* types of settings for AnimChannels */
typedef enum eAnimChannel_Settings {
	ACHANNEL_SETTING_SELECT   = 0,
	ACHANNEL_SETTING_PROTECT  = 1, /* warning: for drawing UI's, need to check if this is off (maybe inverse this later) */
	ACHANNEL_SETTING_MUTE     = 2,
	ACHANNEL_SETTING_EXPAND   = 3,
	ACHANNEL_SETTING_VISIBLE  = 4,  /* only for Graph Editor */
	ACHANNEL_SETTING_SOLO     = 5,  /* only for NLA Tracks */
	ACHANNEL_SETTING_PINNED   = 6,  /* only for NLA Actions */
	ACHANNEL_SETTING_MOD_OFF  = 7,
	ACHANNEL_SETTING_ALWAYS_VISIBLE = 8,  /* channel is pinned and always visible */
} eAnimChannel_Settings;


/* Drawing, mouse handling, and flag setting behavior... */
typedef struct bAnimChannelType {
	/* -- Type data -- */
	/* name of the channel type, for debugging */
	const char *channel_type_name;
	/* "level" or role in hierarchy - for finding the active channel */
	eAnimChannel_Role channel_role;
	
	/* -- Drawing -- */
	/* get RGB color that is used to draw the majority of the backdrop */
	void (*get_backdrop_color)(bAnimContext *ac, bAnimListElem *ale, float r_color[3]);
	/* draw backdrop strip for channel */
	void (*draw_backdrop)(bAnimContext *ac, bAnimListElem *ale, float yminc, float ymaxc);
	/* get depth of indention (relative to the depth channel is nested at) */
	short (*get_indent_level)(bAnimContext *ac, bAnimListElem *ale);
	/* get offset in pixels for the start of the channel (in addition to the indent depth) */
	short (*get_offset)(bAnimContext *ac, bAnimListElem *ale);
	
	/* get name (for channel lists) */
	void (*name)(bAnimListElem *ale, char *name);
	/* get RNA property+pointer for editing the name */
	bool (*name_prop)(bAnimListElem *ale, struct PointerRNA *ptr, struct PropertyRNA **prop);
	/* get icon (for channel lists) */
	int (*icon)(bAnimListElem *ale);
	
	/* -- Settings -- */
	/* check if the given setting is valid in the current context */
	bool (*has_setting)(bAnimContext *ac, bAnimListElem *ale, eAnimChannel_Settings setting);
	/* get the flag used for this setting */
	int (*setting_flag)(bAnimContext *ac, eAnimChannel_Settings setting, bool *neg);
	/* get the pointer to int/short where data is stored,
	 * with type being  sizeof(ptr_data) which should be fine for runtime use...
	 *	- assume that setting has been checked to be valid for current context
	 */
	void *(*setting_ptr)(bAnimListElem *ale, eAnimChannel_Settings setting, short *type);
} bAnimChannelType;

/* ------------------------ Drawing API -------------------------- */

/* Get typeinfo for the given channel */
const bAnimChannelType *ANIM_channel_get_typeinfo(bAnimListElem *ale);

/* Print debugging info about a given channel */
void ANIM_channel_debug_print_info(bAnimListElem *ale, short indent_level);

/* Draw the given channel */
void ANIM_channel_draw(bAnimContext *ac, bAnimListElem *ale, float yminc, float ymaxc, size_t channel_index);
/* Draw the widgets for the given channel */
void ANIM_channel_draw_widgets(const struct bContext *C, bAnimContext *ac, bAnimListElem *ale, struct uiBlock *block, float yminc, float ymaxc, size_t channel_index);


/* ------------------------ Editing API -------------------------- */

/* Check if some setting for a channel is enabled 
 * Returns: 1 = On, 0 = Off, -1 = Invalid
 *
 *  - setting: eAnimChannel_Settings
 */
short ANIM_channel_setting_get(bAnimContext *ac, bAnimListElem *ale, eAnimChannel_Settings setting);

/* Change value of some setting for a channel 
 *	- setting: eAnimChannel_Settings
 *	- mode: eAnimChannels_SetFlag
 */
void ANIM_channel_setting_set(bAnimContext *ac, bAnimListElem *ale, eAnimChannel_Settings setting, eAnimChannels_SetFlag mode);


/* Flush visibility (for Graph Editor) changes up/down hierarchy for changes in the given setting 
 *	- anim_data: list of the all the anim channels that can be chosen
 *		-> filtered using ANIMFILTER_CHANNELS only, since if we took VISIBLE too,
 *		  then the channels under closed expanders get ignored...
 *	- ale_setting: the anim channel (not in the anim_data list directly, though occurring there)
 *		with the new state of the setting that we want flushed up/down the hierarchy
 *	- setting: type of setting to set
 *	- on: whether the visibility setting has been enabled or disabled
 */
void ANIM_flush_setting_anim_channels(bAnimContext *ac, ListBase *anim_data, bAnimListElem *ale_setting, eAnimChannel_Settings setting, eAnimChannels_SetFlag mode);


/* Deselect all animation channels */
void ANIM_deselect_anim_channels(bAnimContext *ac, void *data, eAnimCont_Types datatype, bool test, eAnimChannels_SetFlag sel);

/* Set the 'active' channel of type channel_type, in the given action */
void ANIM_set_active_channel(bAnimContext *ac, void *data, eAnimCont_Types datatype, eAnimFilter_Flags filter, void *channel_data, eAnim_ChannelType channel_type);


/* Delete the F-Curve from the given AnimData block (if possible), as appropriate according to animation context */
void ANIM_fcurve_delete_from_animdata(bAnimContext *ac, struct AnimData *adt, struct FCurve *fcu);

/* ************************************************ */
/* DRAWING API */
/* anim_draw.c */

/* ---------- Current Frame Drawing ---------------- */

/* flags for Current Frame Drawing */
enum eAnimEditDraw_CurrentFrame {
	/* plain time indicator with no special indicators */
	DRAWCFRA_PLAIN          = 0,
	/* time indication in seconds or frames */
	DRAWCFRA_UNIT_SECONDS   = (1 << 0),
	/* draw indicator extra wide (for timeline) */
	DRAWCFRA_WIDE           = (1 << 1)
};

/* main call to draw current-frame indicator in an Animation Editor */
void ANIM_draw_cfra(const struct bContext *C, struct View2D *v2d, short flag);

/* main call to draw "number box" in scrollbar for current frame indicator */
void ANIM_draw_cfra_number(const struct bContext *C, struct View2D *v2d, short flag);

/* ------------- Preview Range Drawing -------------- */

/* main call to draw preview range curtains */
void ANIM_draw_previewrange(const struct bContext *C, struct View2D *v2d, int end_frame_width);


/* -------------- Frame Range Drawing --------------- */

/* main call to draw normal frame range indicators */
void ANIM_draw_framerange(struct Scene *scene, struct View2D *v2d);

/* ************************************************* */
/* F-MODIFIER TOOLS */

/* ------------- UI Panel Drawing -------------- */

/* draw a given F-Modifier for some layout/UI-Block */
void ANIM_uiTemplate_fmodifier_draw(struct uiLayout *layout, struct ID *id, ListBase *modifiers, struct FModifier *fcm);

/* ------------- Copy/Paste Buffer -------------- */


/* free the copy/paste buffer */
void ANIM_fmodifiers_copybuf_free(void);

/* copy the given F-Modifiers to the buffer, returning whether anything was copied or not
 * assuming that the buffer has been cleared already with ANIM_fmodifiers_copybuf_free()
 *	- active: only copy the active modifier
 */
bool ANIM_fmodifiers_copy_to_buf(ListBase *modifiers, bool active);

/* 'Paste' the F-Modifier(s) from the buffer to the specified list 
 *	- replace: free all the existing modifiers to leave only the pasted ones
 */
bool ANIM_fmodifiers_paste_from_buf(ListBase *modifiers, bool replace, struct FCurve *curve);

/* ************************************************* */
/* ASSORTED TOOLS */

/* ------------ Animation F-Curves <-> Icons/Names Mapping ------------ */
/* anim_ipo_utils.c */

/* Get icon + name for channel-list displays for F-Curve */
int getname_anim_fcurve(char *name, struct ID *id, struct FCurve *fcu);

/* Automatically determine a color for the nth F-Curve */
void getcolor_fcurve_rainbow(int cur, int tot, float out[3]);

/* ----------------- NLA Drawing ----------------------- */
/* NOTE: Technically, this is not in the animation module (it's in space_nla)
 * but these are sometimes needed by various animation apis.
 */

/* Get color to use for NLA Action channel's background */
void nla_action_get_color(struct AnimData *adt, struct bAction *act, float color[4]);

/* ----------------- NLA-Mapping ----------------------- */
/* anim_draw.c */

/* Obtain the AnimData block providing NLA-scaling for the given channel if applicable */
struct AnimData *ANIM_nla_mapping_get(bAnimContext *ac, bAnimListElem *ale);

/* Apply/Unapply NLA mapping to all keyframes in the nominated F-Curve */
void ANIM_nla_mapping_apply_fcurve(struct AnimData *adt, struct FCurve *fcu, bool restore, bool only_keys);

/* ..... */

/* Perform auto-blending/extend refreshes after some operations */
// NOTE: defined in space_nla/nla_edit.c, not in animation/
void ED_nla_postop_refresh(bAnimContext *ac);

/* ------------- Unit Conversion Mappings ------------- */
/* anim_draw.c */

/* flags for conversion mapping */
typedef enum eAnimUnitConv_Flags {
	/* restore to original internal values */
	ANIM_UNITCONV_RESTORE   = (1 << 0),
	/* ignore handles (i.e. only touch main keyframes) */
	ANIM_UNITCONV_ONLYKEYS  = (1 << 1),
	/* only touch selected BezTriples */
	ANIM_UNITCONV_ONLYSEL   = (1 << 2),
	/* only touch selected vertices */
	ANIM_UNITCONV_SELVERTS  = (1 << 3),
	ANIM_UNITCONV_SKIPKNOTS  = (1 << 4),
	/* Scale FCurve i a way it fits to -1..1 space */
	ANIM_UNITCONV_NORMALIZE  = (1 << 5),
	/* Only when normalization is used: use scale factor from previous run,
	 * prevents curves from jumping all over the place when tweaking them.
	 */
	ANIM_UNITCONV_NORMALIZE_FREEZE  = (1 << 6),
} eAnimUnitConv_Flags;

/* Normalization flags from Space Graph passing to ANIM_unit_mapping_get_factor */
short ANIM_get_normalization_flags(bAnimContext *ac);

/* Get unit conversion factor for given ID + F-Curve */
float ANIM_unit_mapping_get_factor(struct Scene *scene, struct ID *id, struct FCurve *fcu, short flag, float *r_offset);

/* ------------- Utility macros ----------------------- */

/* provide access to Keyframe Type info in BezTriple
 * NOTE: this is so that we can change it from being stored in 'hide'
 */
#define BEZKEYTYPE(bezt) ((bezt)->hide)

/* set/clear/toggle macro 
 *	- channel - channel with a 'flag' member that we're setting
 *	- smode - 0=clear, 1=set, 2=invert
 *	- sflag - bitflag to set
 */
#define ACHANNEL_SET_FLAG(channel, smode, sflag) \
	{ \
		if      (smode == ACHANNEL_SETFLAG_INVERT)  (channel)->flag ^=  (sflag); \
		else if (smode == ACHANNEL_SETFLAG_ADD)     (channel)->flag |=  (sflag); \
		else                                        (channel)->flag &= ~(sflag); \
	}
	
/* set/clear/toggle macro, where the flag is negative 
 *	- channel - channel with a 'flag' member that we're setting
 *	- smode - 0=clear, 1=set, 2=invert
 *	- sflag - bitflag to set
 */
#define ACHANNEL_SET_FLAG_NEG(channel, smode, sflag) \
	{ \
		if      (smode == ACHANNEL_SETFLAG_INVERT)  (channel)->flag ^=  (sflag); \
		else if (smode == ACHANNEL_SETFLAG_ADD)     (channel)->flag &= ~(sflag); \
		else                                        (channel)->flag |=  (sflag); \
	}


/* --------- anim_deps.c, animation updates -------- */

void ANIM_id_update(struct Scene *scene, struct ID *id);
void ANIM_list_elem_update(struct Scene *scene, bAnimListElem *ale);

/* data -> channels syncing */
void ANIM_sync_animchannels_to_data(const struct bContext *C);

void ANIM_center_frame(struct bContext *C, int smooth_viewtx);
/* ************************************************* */
/* OPERATORS */
	
/* generic animation channels */
void ED_operatortypes_animchannels(void);
void ED_keymap_animchannels(struct wmKeyConfig *keyconf);

/* generic time editing */
void ED_operatortypes_anim(void);
void ED_keymap_anim(struct wmKeyConfig *keyconf);
	
/* space_graph */
void ED_operatormacros_graph(void);
/* space_action */
void ED_operatormacros_action(void);

/* ************************************************ */
/* Animation Editor Exports */
/* XXX: Should we be doing these here, or at all? */

/* Action Editor - Action Management */
struct AnimData *ED_actedit_animdata_from_context(struct bContext *C);
void ED_animedit_unlink_action(struct bContext *C, struct ID *id, 
                               struct AnimData *adt, struct bAction *act,
                               struct ReportList *reports, bool force_delete);

/* ************************************************ */

#endif /* __ED_ANIM_API_H__ */