/******************************************************************************
 * Spine Runtimes License Agreement
 * Last updated January 1, 2020. Replaces all prior versions.
 *
 * Copyright (c) 2013-2020, Esoteric Software LLC
 *
 * Integration of the Spine Runtimes into software or otherwise creating
 * derivative works of the Spine Runtimes is permitted under the terms and
 * conditions of Section 2 of the Spine Editor License Agreement:
 * http://esotericsoftware.com/spine-editor-license
 *
 * Otherwise, it is permitted to integrate the Spine Runtimes into software
 * or otherwise create derivative works of the Spine Runtimes (collectively,
 * "Products"), provided that each user of the Products must obtain their own
 * Spine Editor license and redistribution of the Products in any form must
 * include this license and copyright notice.
 *
 * THE SPINE RUNTIMES ARE PROVIDED BY ESOTERIC SOFTWARE LLC "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 ESOTERIC SOFTWARE LLC BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES,
 * BUSINESS INTERRUPTION, OR LOSS OF USE, DATA, OR PROFITS) 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
 * THE SPINE RUNTIMES, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *****************************************************************************/

#ifdef SPINE_UE4
    #include "SpinePluginPrivatePCH.h"
#endif

#include <spine/ColorTimeline.h>

#include <spine/Event.h>
#include <spine/Skeleton.h>

#include <spine/Animation.h>
#include <spine/Bone.h>
#include <spine/Slot.h>
#include <spine/SlotData.h>
#include <spine/TimelineType.h>

using namespace spine;

RTTI_IMPL(ColorTimeline, CurveTimeline)

const int ColorTimeline::ENTRIES = 5;
const int ColorTimeline::PREV_TIME = -5;
const int ColorTimeline::PREV_R = -4;
const int ColorTimeline::PREV_G = -3;
const int ColorTimeline::PREV_B = -2;
const int ColorTimeline::PREV_A = -1;
const int ColorTimeline::R = 1;
const int ColorTimeline::G = 2;
const int ColorTimeline::B = 3;
const int ColorTimeline::A = 4;

ColorTimeline::ColorTimeline(int frameCount) : CurveTimeline(frameCount), _slotIndex(0) {
    _frames.setSize(frameCount * ENTRIES, 0);
}

void ColorTimeline::apply(Skeleton &skeleton, float lastTime, float time, Vector<Event *> *pEvents, float alpha,
                          MixBlend blend, MixDirection direction) {
    SP_UNUSED(lastTime);
    SP_UNUSED(pEvents);
    SP_UNUSED(direction);

    Slot *slotP = skeleton._slots[_slotIndex];
    Slot &slot = *slotP;
    if (!slot._bone.isActive()) return;
    if (time < _frames[0]) {
        switch (blend) {
            case MixBlend_Setup:
                slot._color.set(slot._data._color);
                return;
            case MixBlend_First: {
                Color &color = slot._color, setup = slot._data._color;
                color.add((setup.r - color.r) * alpha, (setup.g - color.g) * alpha, (setup.b - color.b) * alpha,
                          (setup.a - color.a) * alpha);
            }
            default:;
        }
        return;
    }

    float r, g, b, a;
    if (time >= _frames[_frames.size() - ENTRIES]) {
        // Time is after last frame.
        size_t i = _frames.size();
        r = _frames[i + PREV_R];
        g = _frames[i + PREV_G];
        b = _frames[i + PREV_B];
        a = _frames[i + PREV_A];
    } else {
        // Interpolate between the previous frame and the current frame.
        size_t frame = (size_t)Animation::binarySearch(_frames, time, ENTRIES);
        r = _frames[frame + PREV_R];
        g = _frames[frame + PREV_G];
        b = _frames[frame + PREV_B];
        a = _frames[frame + PREV_A];
        float frameTime = _frames[frame];
        float percent = getCurvePercent(frame / ENTRIES - 1, 1 - (time - frameTime) / (_frames[frame + PREV_TIME] - frameTime));

        r += (_frames[frame + R] - r) * percent;
        g += (_frames[frame + G] - g) * percent;
        b += (_frames[frame + B] - b) * percent;
        a += (_frames[frame + A] - a) * percent;
    }

    if (alpha == 1) {
        slot.getColor().set(r, g, b, a);
    } else {
        Color &color = slot.getColor();
        if (blend == MixBlend_Setup) color.set(slot.getData().getColor());
        color.add((r - color.r) * alpha, (g - color.g) * alpha, (b - color.b) * alpha, (a - color.a) * alpha);
    }
}

int ColorTimeline::getPropertyId() {
    return ((int)TimelineType_Color << 24) + _slotIndex;
}

void ColorTimeline::setFrame(int frameIndex, float time, float r, float g, float b, float a) {
    frameIndex *= ENTRIES;
    _frames[frameIndex] = time;
    _frames[frameIndex + R] = r;
    _frames[frameIndex + G] = g;
    _frames[frameIndex + B] = b;
    _frames[frameIndex + A] = a;
}

int ColorTimeline::getSlotIndex() {
    return _slotIndex;
}

void ColorTimeline::setSlotIndex(int inValue) {
    _slotIndex = inValue;
}
