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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2024                                                               *
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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>
#include <optional>

namespace {
    constexpr openspace::properties::Property::PropertyInfo ShouldInterpolateInfo = {
        "ShouldInterpolate",
        "Should Interpolate",
        "If this value is set to 'true', an interpolation is applied between the given "
        "keyframes. If this value is set to 'false', the interpolation is not applied.",
        openspace::properties::Property::Visibility::AdvancedUser
    };

    struct [[codegen::Dictionary(TimelineRotation)]] Parameters {
        // A table of keyframes, with keys formatted as YYYY-MM-DDTHH:MM:SS and values
        // that are valid Rotation objects
        std::map<std::string, ghoul::Dictionary> keyframes
            [[codegen::reference("core_transform_rotation")]];

        // [[codegen::verbatim(ShouldInterpolateInfo.description)]]
        std::optional<bool> shouldInterpolate;
    };
#include "timelinerotation_codegen.cpp"
} // namespace

namespace openspace {

documentation::Documentation TimelineRotation::Documentation() {
    return codegen::doc<Parameters>("base_transform_rotation_keyframe");
}

TimelineRotation::TimelineRotation(const ghoul::Dictionary& dictionary)
    : _shouldInterpolate(ShouldInterpolateInfo, true)
{
    const Parameters p = codegen::bake<Parameters>(dictionary);

    for (const std::pair<const std::string, ghoul::Dictionary>& kf : p.keyframes) {
        const double t = Time::convertTime(kf.first);

        ghoul::mm_unique_ptr<Rotation> rotation = Rotation::createFromDictionary(
            kf.second
        );
        if (rotation) {
            _timeline.addKeyframe(t, std::move(rotation));
        }
    }

    _shouldInterpolate = p.shouldInterpolate.value_or(_shouldInterpolate);
    addProperty(_shouldInterpolate);
}

glm::dmat3 TimelineRotation::matrix(const UpdateData& data) const {
    const double now = data.time.j2000Seconds();
    using KeyframePointer = const Keyframe<ghoul::mm_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;
    if (_shouldInterpolate) {
        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));
    }
    else {
        return now < nextTime ? prev->data->matrix(data) : next->data->matrix(data);
    }
}

} // namespace openspace