/*
 * ***** 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) 2016 Blender Foundation.
 * All rights reserved.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file blender/windowmanager/manipulators/WM_manipulator_types.h
 *  \ingroup wm
 *
 * \name Manipulator Types
 * \brief Manipulator defines for external use.
 *
 * Only included in WM_types.h and lower level files.
 */


#ifndef __WM_MANIPULATOR_TYPES_H__
#define __WM_MANIPULATOR_TYPES_H__

#include "BLI_compiler_attrs.h"

struct wmManipulatorGroupType;
struct wmManipulatorGroup;
struct wmManipulator;
struct wmKeyConfig;

#include "wm_manipulator_fn.h"

/* -------------------------------------------------------------------- */
/* wmManipulator */

/* manipulators are set per region by registering them on manipulator-maps */
struct wmManipulator {
	struct wmManipulator *next, *prev;

	char idname[64 + 4]; /* MAX_NAME + 4 for unique '.001', '.002', etc suffix */

	/* While we don't have a real type, use this to put type-like vars. */
	const struct wmManipulatorType *type;

	/* Overrides 'type->handler' when set. */
	wmManipulatorFnHandler custom_handler;

	void *custom_data;

	/* pointer back to group this manipulator is in (just for quick access) */
	struct wmManipulatorGroup *parent_mgroup;

	int flag; /* flags that influence the behavior or how the manipulators are drawn */
	short state; /* state flags (active, highlighted, selected) */

	unsigned char highlighted_part;

	/* center of manipulator in space, 2d or 3d */
	float origin[3];
	/* custom offset from origin */
	float offset[3];
	/* runtime property, set the scale while drawing on the viewport */
	float scale;
	/* user defined scale, in addition to the original one */
	float user_scale;
	/* user defined width for line drawing */
	float line_width;
	/* manipulator colors (uses default fallbacks if not defined) */
	float col[4], col_hi[4];

	/* data used during interaction */
	void *interaction_data;

	/* name of operator to spawn when activating the manipulator */
	const char *opname;
	/* operator properties if manipulator spawns and controls an operator,
	 * or owner pointer if manipulator spawns and controls a property */
	PointerRNA opptr;

	/* arrays of properties attached to various manipulator parameters. As
	 * the manipulator is interacted with, those properties get updated */
	PointerRNA *ptr;
	PropertyRNA **props;
};

/**
 * Simple utility wrapper for storing a single manipulator as wmManipulatorGroup.customdata (which gets freed).
 */
typedef struct wmManipulatorWrapper {
	struct wmManipulator *manipulator;
} wmManipulatorWrapper;

/* wmManipulator.flag
 * Flags for individual manipulators. */
enum {
	WM_MANIPULATOR_DRAW_HOVER  = (1 << 0), /* draw *only* while hovering */
	WM_MANIPULATOR_DRAW_ACTIVE = (1 << 1), /* draw while dragging */
	WM_MANIPULATOR_DRAW_VALUE  = (1 << 2), /* draw an indicator for the current value while dragging */
	WM_MANIPULATOR_HIDDEN      = (1 << 3),
};

/* wmManipulator.state */
enum {
	WM_MANIPULATOR_STATE_HIGHLIGHT   = (1 << 0), /* while hovered */
	WM_MANIPULATOR_STATE_ACTIVE      = (1 << 1), /* while dragging */
	WM_MANIPULATOR_STATE_SELECT      = (1 << 2),
};

/**
 * \brief Manipulator tweak flag.
 * Bitflag passed to manipulator while tweaking.
 */
enum {
	/* drag with extra precision (shift)
	 * NOTE: Manipulators are responsible for handling this (manipulator->handler callback)! */
	WM_MANIPULATOR_TWEAK_PRECISE = (1 << 0),
};

typedef struct wmManipulatorType {
	struct wmManipulatorGroupType *next, *prev;

	const char *idname; /* MAX_NAME */

	uint size;

	/* could become wmManipulatorType */
	/* draw manipulator */
	wmManipulatorFnDraw draw;

	/* determines 3d intersection by rendering the manipulator in a selection routine. */
	wmManipulatorFnDrawSelect draw_select;

	/* determine if the mouse intersects with the manipulator. The calculation should be done in the callback itself */
	wmManipulatorFnIntersect intersect;

	/* handler used by the manipulator. Usually handles interaction tied to a manipulator type */
	wmManipulatorFnHandler handler;

	/* manipulator-specific handler to update manipulator attributes based on the property value */
	wmManipulatorFnPropDataUpdate prop_data_update;

	/* returns the final position which may be different from the origin, depending on the manipulator.
	 * used in calculations of scale */
	wmManipulatorFnFinalPositionGet position_get;

	/* activate a manipulator state when the user clicks on it */
	wmManipulatorFnInvoke invoke;

	/* called when manipulator tweaking is done - used to free data and reset property when cancelling */
	wmManipulatorFnExit exit;

	wmManipulatorFnCursorGet cursor_get;

	/* called when manipulator selection state changes */
	wmManipulatorFnSelect select;

	/* maximum number of properties attached to the manipulator */
	int prop_len_max;

	/* RNA integration */
	ExtensionRNA ext;
} wmManipulatorType;


/* -------------------------------------------------------------------- */
/* wmManipulatorGroup */

/* factory class for a manipulator-group type, gets called every time a new area is spawned */
typedef struct wmManipulatorGroupType {
	struct wmManipulatorGroupType *next, *prev;

	char idname[64];  /* MAX_NAME */
	const char *name; /* manipulator-group name - displayed in UI (keymap editor) */

	/* poll if manipulator-map should be visible */
	wmManipulatorGroupFnPoll poll;
	/* initially create manipulators and set permanent data - stuff you only need to do once */
	wmManipulatorGroupFnInit init;
	/* refresh data, only called if recreate flag is set (WM_manipulatormap_tag_refresh) */
	wmManipulatorGroupFnRefresh refresh;
	/* refresh data for drawing, called before each redraw */
	wmManipulatorGroupFnDrawPrepare draw_prepare;

	/* keymap init callback for this manipulator-group */
	struct wmKeyMap *(*keymap_init)(const struct wmManipulatorGroupType *, struct wmKeyConfig *);
	/* keymap created with callback from above */
	struct wmKeyMap *keymap;

	/* Disable for now, maybe some day we want properties. */
#if 0
	/* rna for properties */
	struct StructRNA *srna;
#endif

	/* RNA integration */
	ExtensionRNA ext;

	int flag;

	/* Weak, but needed to store which functions we have. */
	int rna_func_flag;

	/* if type is spawned from operator this is set here */
	void *op;

	/* same as manipulator-maps, so registering/unregistering goes to the correct region */
	short spaceid, regionid;
	char mapidname[64];
} wmManipulatorGroupType;

/**
 * wmManipulatorGroupType.flag
 * Flags that influence the behavior of all manipulators in the group.
 */
enum {
	/* Mark manipulator-group as being 3D */
	WM_MANIPULATORGROUPTYPE_IS_3D       = (1 << 0),
	/* Scale manipulators as 3D object that respects zoom (otherwise zoom independent draw size) */
	WM_MANIPULATORGROUPTYPE_SCALE_3D    = (1 << 1),
	/* Manipulators can be depth culled with scene objects (covered by other geometry - TODO) */
	WM_MANIPULATORGROUPTYPE_SCENE_DEPTH = (1 << 2),
	/* Manipulators can be selected */
	WM_MANIPULATORGROUPTYPE_SELECTABLE  = (1 << 3),
	/* manipulator group is attached to operator, and is only accessible as long as this runs */
	WM_MANIPULATORGROUPTYPE_OP          = (1 << 4),
};


/* -------------------------------------------------------------------- */
/* wmManipulatorMap */

struct wmManipulatorMapType_Params {
	const char *idname;
	const int spaceid;
	const int regionid;
};

/**
 * Pass a value of this enum to #WM_manipulatormap_draw to tell it what to draw.
 */
enum {
	/* Draw 2D manipulator-groups (ManipulatorGroupType.is_3d == false) */
	WM_MANIPULATORMAP_DRAWSTEP_2D = 0,
	/* Draw 3D manipulator-groups (ManipulatorGroupType.is_3d == true) */
	WM_MANIPULATORMAP_DRAWSTEP_3D,
	/* Draw only depth culled manipulators (WM_MANIPULATOR_SCENE_DEPTH flag).
	 * Note that these are expected to be 3D manipulators too. */
	WM_MANIPULATORMAP_DRAWSTEP_IN_SCENE,
};

#endif  /* __WM_MANIPULATOR_TYPES_H__ */