/*******************************************************************************
 * Copyright (c) 2013, Esoteric Software
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 * 1. Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list 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/AnimationStateData.h>
#include <spine/extension.h>

namespace spine {

typedef struct _ToEntry _ToEntry;
struct _ToEntry {
	Animation* animation;
	float duration;
	_ToEntry* next;
};

_ToEntry* _ToEntry_create (Animation* to, float duration) {
	_ToEntry* self = NEW(_ToEntry);
	self->animation = to;
	self->duration = duration;
	return self;
}

void _ToEntry_dispose (_ToEntry* self) {
	FREE(self);
}

/**/

typedef struct _FromEntry _FromEntry;
struct _FromEntry {
	Animation* animation;
	_ToEntry* toEntries;
	_FromEntry* next;
};

_FromEntry* _FromEntry_create (Animation* from) {
	_FromEntry* self = NEW(_FromEntry);
	self->animation = from;
	return self;
}

void _FromEntry_dispose (_FromEntry* self) {
	FREE(self);
}

/**/

AnimationStateData* AnimationStateData_create (SkeletonData* skeletonData) {
	AnimationStateData* self = NEW(AnimationStateData);
	CONST_CAST(SkeletonData*, self->skeletonData) = skeletonData;
	return self;
}

void AnimationStateData_dispose (AnimationStateData* self) {
	_ToEntry* toEntry;
	_ToEntry* nextToEntry;
	_FromEntry* nextFromEntry;

	_FromEntry* fromEntry = (_FromEntry*)self->entries;
	while (fromEntry) {
		toEntry = fromEntry->toEntries;
		while (toEntry) {
			nextToEntry = toEntry->next;
			_ToEntry_dispose(toEntry);
			toEntry = nextToEntry;
		}
		nextFromEntry = fromEntry->next;
		_FromEntry_dispose(fromEntry);
		fromEntry = nextFromEntry;
	}

	FREE(self);
}

void AnimationStateData_setMixByName (AnimationStateData* self, const char* fromName, const char* toName, float duration) {
	Animation* to;
	Animation* from = SkeletonData_findAnimation(self->skeletonData, fromName);
	if (!from) return;
	to = SkeletonData_findAnimation(self->skeletonData, toName);
	if (!to) return;
	AnimationStateData_setMix(self, from, to, duration);
}

void AnimationStateData_setMix (AnimationStateData* self, Animation* from, Animation* to, float duration) {
	/* Find existing FromEntry. */
	_ToEntry* toEntry;
	_FromEntry* fromEntry = (_FromEntry*)self->entries;
	while (fromEntry) {
		if (fromEntry->animation == from) {
			/* Find existing ToEntry. */
			toEntry = fromEntry->toEntries;
			while (toEntry) {
				if (toEntry->animation == to) {
					toEntry->duration = duration;
					return;
				}
				toEntry = toEntry->next;
			}
			break; /* Add new ToEntry to the existing FromEntry. */
		}
		fromEntry = fromEntry->next;
	}
	if (!fromEntry) {
		fromEntry = _FromEntry_create(from);
		fromEntry->next = (_FromEntry*)self->entries;
		CONST_CAST(_FromEntry*, self->entries) = fromEntry;
	}
	toEntry = _ToEntry_create(to, duration);
	toEntry->next = fromEntry->toEntries;
	fromEntry->toEntries = toEntry;
}

float AnimationStateData_getMix (AnimationStateData* self, Animation* from, Animation* to) {
	_FromEntry* fromEntry = (_FromEntry*)self->entries;
	while (fromEntry) {
		if (fromEntry->animation == from) {
			_ToEntry* toEntry = fromEntry->toEntries;
			while (toEntry) {
				if (toEntry->animation == to) return toEntry->duration;
				toEntry = toEntry->next;
			}
		}
		fromEntry = fromEntry->next;
	}
	return 0;
}

} // namespace spine {