/*
 * ***** 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 *****
 *
 * Implementation of Bone Groups operators and editing API's
 */

/** \file blender/editors/armature/pose_group.c
 *  \ingroup edarmature
 */

#include <string.h>

#include "MEM_guardedalloc.h"

#include "BLI_blenlib.h"

#include "DNA_armature_types.h"
#include "DNA_object_types.h"

#include "BKE_action.h"
#include "BKE_context.h"

#include "RNA_access.h"
#include "RNA_define.h"

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

#include "ED_armature.h"
#include "ED_screen.h"

#include "UI_interface.h"
#include "UI_resources.h"

#include "armature_intern.h"

/* ********************************************** */
/* Bone Groups */

static int pose_group_add_exec(bContext *C, wmOperator *UNUSED(op))
{
	Object *ob = ED_pose_object_from_context(C);

	/* only continue if there's an object and pose */
	if (ELEM(NULL, ob, ob->pose))
		return OPERATOR_CANCELLED;
	
	/* for now, just call the API function for this */
	BKE_pose_add_group(ob->pose, NULL);
	
	/* notifiers for updates */
	WM_event_add_notifier(C, NC_OBJECT | ND_POSE, ob);
	
	return OPERATOR_FINISHED;
}

void POSE_OT_group_add(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Add Bone Group";
	ot->idname = "POSE_OT_group_add";
	ot->description = "Add a new bone group";
	
	/* api callbacks */
	ot->exec = pose_group_add_exec;
	ot->poll = ED_operator_posemode_context;
	
	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}


static int pose_group_remove_exec(bContext *C, wmOperator *UNUSED(op))
{
	Object *ob = ED_pose_object_from_context(C);
	
	/* only continue if there's an object and pose */
	if (ELEM(NULL, ob, ob->pose))
		return OPERATOR_CANCELLED;
	
	/* for now, just call the API function for this */
	BKE_pose_remove_group_index(ob->pose, ob->pose->active_group);
	
	/* notifiers for updates */
	WM_event_add_notifier(C, NC_OBJECT | ND_POSE, ob);
	
	return OPERATOR_FINISHED;
}

void POSE_OT_group_remove(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Remove Bone Group";
	ot->idname = "POSE_OT_group_remove";
	ot->description = "Remove the active bone group";
	
	/* api callbacks */
	ot->exec = pose_group_remove_exec;
	ot->poll = ED_operator_posemode_context;
	
	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}

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

/* invoke callback which presents a list of bone-groups for the user to choose from */
static int pose_groups_menu_invoke(bContext *C, wmOperator *op, const wmEvent *UNUSED(event))
{
	Object *ob = ED_pose_object_from_context(C);
	bPose *pose;
	PropertyRNA *prop = RNA_struct_find_property(op->ptr, "type");
	
	uiPopupMenu *pup;
	uiLayout *layout;
	bActionGroup *grp;
	int i;
	
	/* only continue if there's an object, and a pose there too */
	if (ELEM(NULL, ob, ob->pose)) 
		return OPERATOR_CANCELLED;
	pose = ob->pose;

	/* If group index is set, try to use it! */
	if (RNA_property_is_set(op->ptr, prop)) {
		const int num_groups = BLI_listbase_count(&pose->agroups);
		const int group = RNA_property_int_get(op->ptr, prop);

		/* just use the active group index, and call the exec callback for the calling operator */
		if (group > 0 && group <= num_groups) {
			return op->type->exec(C, op);
		}
	}
	
	/* if there's no active group (or active is invalid), create a new menu to find it */
	if (pose->active_group <= 0) {
		/* create a new menu, and start populating it with group names */
		pup = UI_popup_menu_begin(C, op->type->name, ICON_NONE);
		layout = UI_popup_menu_layout(pup);
		
		/* special entry - allow to create new group, then use that 
		 *	(not to be used for removing though)
		 */
		if (strstr(op->idname, "assign")) {
			uiItemIntO(layout, "New Group", ICON_NONE, op->idname, "type", 0);
			uiItemS(layout);
		}
		
		/* add entries for each group */
		for (grp = pose->agroups.first, i = 1; grp; grp = grp->next, i++)
			uiItemIntO(layout, grp->name, ICON_NONE, op->idname, "type", i);
			
		/* finish building the menu, and process it (should result in calling self again) */
		UI_popup_menu_end(C, pup);
		
		return OPERATOR_INTERFACE;
	}
	else {
		/* just use the active group index, and call the exec callback for the calling operator */
		RNA_int_set(op->ptr, "type", pose->active_group);
		return op->type->exec(C, op);
	}
}

/* Assign selected pchans to the bone group that the user selects */
static int pose_group_assign_exec(bContext *C, wmOperator *op)
{
	Object *ob = ED_pose_object_from_context(C);
	bPose *pose;
	bool done = false;

	/* only continue if there's an object, and a pose there too */
	if (ELEM(NULL, ob, ob->pose))
		return OPERATOR_CANCELLED;

	pose = ob->pose;
	
	/* set the active group number to the one from operator props 
	 *  - if 0 after this, make a new group...
	 */
	pose->active_group = RNA_int_get(op->ptr, "type");
	if (pose->active_group == 0)
		BKE_pose_add_group(ob->pose, NULL);
	
	/* add selected bones to group then */
	CTX_DATA_BEGIN (C, bPoseChannel *, pchan, selected_pose_bones)
	{
		pchan->agrp_index = pose->active_group;
		done = true;
	}
	CTX_DATA_END;

	/* notifiers for updates */
	WM_event_add_notifier(C, NC_OBJECT | ND_POSE, ob);
	
	/* report done status */
	if (done)
		return OPERATOR_FINISHED;
	else
		return OPERATOR_CANCELLED;
}

void POSE_OT_group_assign(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Add Selected to Bone Group";
	ot->idname = "POSE_OT_group_assign";
	ot->description = "Add selected bones to the chosen bone group";
	
	/* api callbacks */
	ot->invoke = pose_groups_menu_invoke;
	ot->exec = pose_group_assign_exec;
	ot->poll = ED_operator_posemode_context;
	
	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
	
	/* properties */
	RNA_def_int(ot->srna, "type", 0, 0, INT_MAX, "Bone Group Index", "", 0, 10);
}


static int pose_group_unassign_exec(bContext *C, wmOperator *UNUSED(op))
{
	Object *ob = ED_pose_object_from_context(C);
	bool done = false;
	
	/* only continue if there's an object, and a pose there too */
	if (ELEM(NULL, ob, ob->pose))
		return OPERATOR_CANCELLED;
	
	/* find selected bones to remove from all bone groups */
	CTX_DATA_BEGIN (C, bPoseChannel *, pchan, selected_pose_bones)
	{
		if (pchan->agrp_index) {
			pchan->agrp_index = 0;
			done = true;
		}
	}
	CTX_DATA_END;
	
	/* notifiers for updates */
	WM_event_add_notifier(C, NC_OBJECT | ND_POSE, ob);
	
	/* report done status */
	if (done)
		return OPERATOR_FINISHED;
	else
		return OPERATOR_CANCELLED;
}

void POSE_OT_group_unassign(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Remove Selected from Bone Groups";
	ot->idname = "POSE_OT_group_unassign";
	ot->description = "Remove selected bones from all bone groups";
	
	/* api callbacks */
	ot->exec = pose_group_unassign_exec;
	ot->poll = ED_operator_posemode_context;
	
	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}

static int group_move_exec(bContext *C, wmOperator *op)
{
	Object *ob = ED_pose_object_from_context(C);
	bPose *pose = (ob) ? ob->pose : NULL;
	bPoseChannel *pchan;
	bActionGroup *grp;
	int dir = RNA_enum_get(op->ptr, "direction");
	int grpIndexA, grpIndexB;

	if (ELEM(NULL, ob, pose))
		return OPERATOR_CANCELLED;
	if (pose->active_group <= 0)
		return OPERATOR_CANCELLED;

	/* get group to move */
	grp = BLI_findlink(&pose->agroups, pose->active_group - 1);
	if (grp == NULL)
		return OPERATOR_CANCELLED;

	/* move bone group */
	grpIndexA = pose->active_group;
	if (dir == 1) { /* up */
		void *prev = grp->prev;
		
		if (prev == NULL)
			return OPERATOR_FINISHED;
			
		BLI_remlink(&pose->agroups, grp);
		BLI_insertlinkbefore(&pose->agroups, prev, grp);
		
		grpIndexB = grpIndexA - 1;
		pose->active_group--;
	}
	else { /* down */
		void *next = grp->next;
		
		if (next == NULL)
			return OPERATOR_FINISHED;
			
		BLI_remlink(&pose->agroups, grp);
		BLI_insertlinkafter(&pose->agroups, next, grp);
		
		grpIndexB = grpIndexA + 1;
		pose->active_group++;
	}

	/* fix changed bone group indices in bones (swap grpIndexA with grpIndexB) */
	for (pchan = ob->pose->chanbase.first; pchan; pchan = pchan->next) {
		if (pchan->agrp_index == grpIndexB)
			pchan->agrp_index = grpIndexA;
		else if (pchan->agrp_index == grpIndexA)
			pchan->agrp_index = grpIndexB;
	}

	/* notifiers for updates */
	WM_event_add_notifier(C, NC_OBJECT | ND_POSE, ob);

	return OPERATOR_FINISHED;
}

void POSE_OT_group_move(wmOperatorType *ot)
{
	static EnumPropertyItem group_slot_move[] = {
		{1, "UP", 0, "Up", ""},
		{-1, "DOWN", 0, "Down", ""},
		{0, NULL, 0, NULL, NULL}
	};

	/* identifiers */
	ot->name = "Move Bone Group";
	ot->idname = "POSE_OT_group_move";
	ot->description = "Change position of active Bone Group in list of Bone Groups";

	/* api callbacks */
	ot->exec = group_move_exec;
	ot->poll = ED_operator_posemode_context;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;

	RNA_def_enum(ot->srna, "direction", group_slot_move, 0, "Direction", "Direction to move, UP or DOWN");
}

/* bone group sort element */
typedef struct tSortActionGroup {
	bActionGroup *agrp;
	int index;
} tSortActionGroup;

/* compare bone groups by name */
static int compare_agroup(const void *sgrp_a_ptr, const void *sgrp_b_ptr)
{
	const tSortActionGroup *sgrp_a = sgrp_a_ptr;
	const tSortActionGroup *sgrp_b = sgrp_b_ptr;

	return strcmp(sgrp_a->agrp->name, sgrp_b->agrp->name);
}

static int group_sort_exec(bContext *C, wmOperator *UNUSED(op))
{
	Object *ob = ED_pose_object_from_context(C);
	bPose *pose = (ob) ? ob->pose : NULL;
	bPoseChannel *pchan;
	tSortActionGroup *agrp_array;
	bActionGroup *agrp;
	int agrp_count;
	int i;

	if (ELEM(NULL, ob, pose))
		return OPERATOR_CANCELLED;
	if (pose->active_group <= 0)
		return OPERATOR_CANCELLED;

	/* create temporary array with bone groups and indices */
	agrp_count = BLI_listbase_count(&pose->agroups);
	agrp_array = MEM_mallocN(sizeof(tSortActionGroup) * agrp_count, "sort bone groups");
	for (agrp = pose->agroups.first, i = 0; agrp; agrp = agrp->next, i++) {
		BLI_assert(i < agrp_count);
		agrp_array[i].agrp = agrp;
		agrp_array[i].index = i + 1;
	}

	/* sort bone groups by name */
	qsort(agrp_array, agrp_count, sizeof(tSortActionGroup), compare_agroup);

	/* create sorted bone group list from sorted array */
	BLI_listbase_clear(&pose->agroups);
	for (i = 0; i < agrp_count; i++) {
		BLI_addtail(&pose->agroups, agrp_array[i].agrp);
	}

	/* fix changed bone group indizes in bones */
	for (pchan = ob->pose->chanbase.first; pchan; pchan = pchan->next) {
		for (i = 0; i < agrp_count; i++) {
			if (pchan->agrp_index == agrp_array[i].index) {
				pchan->agrp_index = i + 1;
				break;
			}
		}
	}

	/* free temp resources */
	MEM_freeN(agrp_array);

	/* notifiers for updates */
	WM_event_add_notifier(C, NC_OBJECT | ND_POSE, ob);

	return OPERATOR_FINISHED;
}

void POSE_OT_group_sort(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Sort Bone Groups";
	ot->idname = "POSE_OT_group_sort";
	ot->description = "Sort Bone Groups by their names in ascending order";

	/* api callbacks */
	ot->exec = group_sort_exec;
	ot->poll = ED_operator_posemode_context;

	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}

static void pose_group_select(bContext *C, Object *ob, bool select)
{
	bPose *pose = ob->pose;
	
	CTX_DATA_BEGIN (C, bPoseChannel *, pchan, visible_pose_bones)
	{
		if ((pchan->bone->flag & BONE_UNSELECTABLE) == 0) {
			if (select) {
				if (pchan->agrp_index == pose->active_group) 
					pchan->bone->flag |= BONE_SELECTED;
			}
			else {
				if (pchan->agrp_index == pose->active_group) 
					pchan->bone->flag &= ~BONE_SELECTED;
			}
		}
	}
	CTX_DATA_END;
}

static int pose_group_select_exec(bContext *C, wmOperator *UNUSED(op))
{
	Object *ob = ED_pose_object_from_context(C);
	
	/* only continue if there's an object, and a pose there too */
	if (ELEM(NULL, ob, ob->pose))
		return OPERATOR_CANCELLED;
	
	pose_group_select(C, ob, 1);
	
	/* notifiers for updates */
	WM_event_add_notifier(C, NC_OBJECT | ND_POSE, ob);
	
	return OPERATOR_FINISHED;
}

void POSE_OT_group_select(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Select Bones of Bone Group";
	ot->idname = "POSE_OT_group_select";
	ot->description = "Select bones in active Bone Group";
	
	/* api callbacks */
	ot->exec = pose_group_select_exec;
	ot->poll = ED_operator_posemode_context;
	
	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}

static int pose_group_deselect_exec(bContext *C, wmOperator *UNUSED(op))
{
	Object *ob = ED_pose_object_from_context(C);
	
	/* only continue if there's an object, and a pose there too */
	if (ELEM(NULL, ob, ob->pose))
		return OPERATOR_CANCELLED;
	
	pose_group_select(C, ob, 0);
	
	/* notifiers for updates */
	WM_event_add_notifier(C, NC_OBJECT | ND_POSE, ob);
	
	return OPERATOR_FINISHED;
}

void POSE_OT_group_deselect(wmOperatorType *ot)
{
	/* identifiers */
	ot->name = "Deselect Bone Group";
	ot->idname = "POSE_OT_group_deselect";
	ot->description = "Deselect bones of active Bone Group";
	
	/* api callbacks */
	ot->exec = pose_group_deselect_exec;
	ot->poll = ED_operator_posemode_context;
	
	/* flags */
	ot->flag = OPTYPE_REGISTER | OPTYPE_UNDO;
}

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