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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2019                                                               *
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#include <modules/base/rotation/timelinerotation.h>

#include <openspace/documentation/documentation.h>
#include <openspace/documentation/verifier.h>
#include <openspace/util/updatestructures.h>
#include <openspace/util/time.h>

namespace {
    constexpr const char* KeyType = "Type";
    constexpr const char* KeyKeyframes = "Keyframes";
} // namespace

namespace openspace {

documentation::Documentation TimelineRotation::Documentation() {
    using namespace documentation;
    return {
        "Timeline Rotation",
        "base_transform_rotation_keyframe",
        {
            {
                KeyType,
                new StringEqualVerifier("TimelineRotation"),
                Optional::No
            },
            {
                KeyKeyframes,
                new TableVerifier({
                    { "*", new TableVerifier(), Optional::No, "Any translation object" }
                }),
                Optional::No,
                "A table of keyframes, with keys formatted as YYYY-MM-DDTHH:MM:SS"
                "and values that are valid Rotation objects."
            }
        }
    };
}

TimelineRotation::TimelineRotation(const ghoul::Dictionary& dictionary) {
    documentation::testSpecificationAndThrow(
        Documentation(),
        dictionary,
        "TimelineTranslation"
    );

    const ghoul::Dictionary& keyframes =
        dictionary.value<ghoul::Dictionary>(KeyKeyframes);

    std::vector<std::string> timeStrings = keyframes.keys();
    for (const std::string& timeString : timeStrings) {
        const double t = Time::convertTime(timeString);

        std::unique_ptr<Rotation> rotation =
            Rotation::createFromDictionary(
                keyframes.value<ghoul::Dictionary>(timeString)
            );

        if (rotation) {
            _timeline.addKeyframe(t, std::move(rotation));
        }
    }
}

glm::dmat3 TimelineRotation::matrix(const UpdateData& data) const {
    const double now = data.time.j2000Seconds();
    using KeyframePointer = const Keyframe<std::unique_ptr<Rotation>>*;

    KeyframePointer prev = _timeline.lastKeyframeBefore(now, true);
    KeyframePointer next = _timeline.firstKeyframeAfter(now, true);

    if (!prev && !next) {
        return glm::dmat3(0.0);
    }
    if (!prev) {
        prev = next;
    }
    if (!next) {
        next = prev;
    }
    const double prevTime = prev->timestamp;
    const double nextTime = next->timestamp;

    double t = 0.0;
    if (nextTime - prevTime > 0.0) {
        t = (now - prevTime) / (nextTime - prevTime);
    }

    const glm::dquat nextRot = glm::quat_cast(next->data->matrix(data));
    const glm::dquat prevRot = glm::quat_cast(prev->data->matrix(data));

    return glm::dmat3(glm::slerp(prevRot, nextRot, t));
}

} // namespace openspace