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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2024                                                               *
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#include <modules/base/rendering/renderablesphereimagelocal.h>

#include <openspace/documentation/documentation.h>
#include <openspace/documentation/verifier.h>
#include <openspace/util/sphere.h>
#include <ghoul/filesystem/filesystem.h>
#include <ghoul/io/texture/texturereader.h>
#include <ghoul/opengl/texture.h>
#include <optional>

namespace {
    constexpr openspace::properties::Property::PropertyInfo TextureInfo = {
        "Texture",
        "Texture",
        "This value specifies an image that is loaded from disk and is used as a texture "
        "that is applied to this sphere. This image is expected to be an equirectangular "
        "projection",
        // @VISIBILITY(2.33)
        openspace::properties::Property::Visibility::User
    };

    struct [[codegen::Dictionary(RenderableSphere)]] Parameters {
        // [[codegen::verbatim(TextureInfo.description)]]
        std::string texture;

        // If this value is set to 'true', the image for this sphere will not be loaded at
        // startup but rather when the image is shown for the first time. Additionally, if
        // the sphere is disabled, the image will automatically be unloaded
        std::optional<bool> lazyLoading;
    };
#include "renderablesphereimagelocal_codegen.cpp"
} // namespace

namespace openspace {

documentation::Documentation RenderableSphereImageLocal::Documentation() {
    return codegen::doc<Parameters>("base_renderable_sphere_image_local");
}

RenderableSphereImageLocal::RenderableSphereImageLocal(
                                                      const ghoul::Dictionary& dictionary)
    : RenderableSphere(dictionary)
    , _texturePath(TextureInfo)
{
    const Parameters p = codegen::bake<Parameters>(dictionary);

    _texturePath = p.texture;
    _texturePath.onChange([this]() {
        loadTexture();
    });
    addProperty(_texturePath);
}

bool RenderableSphereImageLocal::isReady() const {
    return RenderableSphere::isReady() && _texture;
}

void RenderableSphereImageLocal::initializeGL() {
    RenderableSphere::initializeGL();

    if (!_isLoadingLazily) {
        loadTexture();
    }
}

void RenderableSphereImageLocal::deinitializeGL() {
    _texture = nullptr;

    RenderableSphere::deinitializeGL();
}

void RenderableSphereImageLocal::update(const UpdateData& data) {
    RenderableSphere::update(data);

    if (_textureIsDirty) {
        loadTexture();
        _textureIsDirty = false;
    }
}

void RenderableSphereImageLocal::bindTexture() {
    _texture->bind();
}

void RenderableSphereImageLocal::loadTexture() {
    if (_texturePath.value().empty()) {
        return;
    }

    std::unique_ptr<ghoul::opengl::Texture> texture =
        ghoul::io::TextureReader::ref().loadTexture(_texturePath, 2);

    if (!texture) {
        LWARNINGC(
            "RenderableSphereImageLocal",
            std::format("Could not load texture from '{}'", absPath(_texturePath))
        );
        return;
    }

    LDEBUGC(
        "RenderableSphereImageLocal",
        std::format("Loaded texture from '{}'", absPath(_texturePath))
    );
    texture->uploadTexture();
    texture->setFilter(ghoul::opengl::Texture::FilterMode::LinearMipMap);
    texture->purgeFromRAM();
    _texture = std::move(texture);
}

} // namespace openspace