/******************************************************************************
 * Spine Runtime Software License - Version 1.1
 * 
 * Copyright (c) 2013, Esoteric Software
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms in whole or in part, with
 * or without modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. A Spine Essential, Professional, Enterprise, or Education License must
 *    be purchased from Esoteric Software and the license must remain valid:
 *    http://esotericsoftware.com/
 * 2. Redistributions of source code must retain this license, which is the
 *    above copyright notice, this declaration of conditions and the following
 *    disclaimer.
 * 3. Redistributions in binary form must reproduce this license, which is the
 *    above copyright notice, this declaration of conditions and the following
 *    disclaimer, in the documentation and/or other materials provided with the
 *    distribution.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *****************************************************************************/

#include <spine/Bone.h>
#include <spine/extension.h>

static int yDown;

void spBone_setYDown (int value) {
	yDown = value;
}

spBone* spBone_create (spBoneData* data, spBone* parent) {
	spBone* self = NEW(spBone);
	CONST_CAST(spBoneData*, self->data) = data;
	CONST_CAST(spBone*, self->parent) = parent;
	spBone_setToSetupPose(self);
	return self;
}

void spBone_dispose (spBone* self) {
	FREE(self);
}

void spBone_setToSetupPose (spBone* self) {
	self->x = self->data->x;
	self->y = self->data->y;
	self->rotation = self->data->rotation;
	self->scaleX = self->data->scaleX;
	self->scaleY = self->data->scaleY;
}

void spBone_updateWorldTransform (spBone* self, int flipX, int flipY) {
	float radians, cosine, sine;
	if (self->parent) {
		CONST_CAST(float, self->worldX) = self->x * self->parent->m00 + self->y * self->parent->m01 + self->parent->worldX;
		CONST_CAST(float, self->worldY) = self->x * self->parent->m10 + self->y * self->parent->m11 + self->parent->worldY;
		if (self->data->inheritScale) {
			CONST_CAST(float, self->worldScaleX) = self->parent->worldScaleX * self->scaleX;
			CONST_CAST(float, self->worldScaleY) = self->parent->worldScaleY * self->scaleY;
		} else {
			CONST_CAST(float, self->worldScaleX) = self->scaleX;
			CONST_CAST(float, self->worldScaleY) = self->scaleY;
		}
		CONST_CAST(float, self->worldRotation) =
				self->data->inheritRotation ? self->parent->worldRotation + self->rotation : self->rotation;
	} else {
		CONST_CAST(float, self->worldX) = flipX ? -self->x : self->x;
		CONST_CAST(float, self->worldY) = (flipY && flipY != yDown) ? -self->y : self->y;
		CONST_CAST(float, self->worldScaleX) = self->scaleX;
		CONST_CAST(float, self->worldScaleY) = self->scaleY;
		CONST_CAST(float, self->worldRotation) = self->rotation;
	}
	radians = (float)(self->worldRotation * 3.1415926535897932385 / 180);
#ifdef __STDC_VERSION__
	cosine = cosf(radians);
	sine = sinf(radians);
#else
	cosine = (float)cos(radians);
	sine = (float)sin(radians);
#endif
	CONST_CAST(float, self->m00) = cosine * self->worldScaleX;
	CONST_CAST(float, self->m10) = sine * self->worldScaleX;
	CONST_CAST(float, self->m01) = -sine * self->worldScaleY;
	CONST_CAST(float, self->m11) = cosine * self->worldScaleY;
	if (flipX) {
		CONST_CAST(float, self->m00) = -self->m00;
		CONST_CAST(float, self->m01) = -self->m01;
	}
	if (flipY != yDown) {
		CONST_CAST(float, self->m10) = -self->m10;
		CONST_CAST(float, self->m11) = -self->m11;
	}
}