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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2023                                                               *
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#include <modules/base/rendering/renderableplaneimageonline.h>

#include <openspace/documentation/documentation.h>
#include <openspace/documentation/verifier.h>
#include <openspace/engine/globals.h>
#include <ghoul/filesystem/filesystem.h>
#include <ghoul/io/texture/texturereader.h>
#include <ghoul/logging/logmanager.h>
#include <ghoul/opengl/texture.h>
#include <ghoul/opengl/textureunit.h>

namespace {
    constexpr openspace::properties::Property::PropertyInfo TextureInfo = {
        "URL",
        "Image URL",
        "Sets the URL of the texture that is displayed on this screen space plane. If "
        "this value is changed, the image at the new path will automatically be loaded "
        "and displayed",
        // @VISIBILITY(2.25)
        openspace::properties::Property::Visibility::User
    };

    struct [[codegen::Dictionary(RenderablePlaneImageOnline)]] Parameters {
        // [[codegen::verbatim(TextureInfo.description)]]
        std::string url [[codegen::key("URL")]];
    };
#include "renderableplaneimageonline_codegen.cpp"
} // namespace

namespace openspace {

documentation::Documentation RenderablePlaneImageOnline::Documentation() {
    return codegen::doc<Parameters>(
        "base_renderable_plane_image_online",
        RenderablePlane::Documentation()
    );
}

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

    _texturePath.onChange([this]() { _textureIsDirty = true; });
    _texturePath = p.url;
    addProperty(_texturePath);

    _autoScale.onChange([this]() {
        if (!_autoScale) {
            return;
        }

        // Shape the plane based on the aspect ration of the image
        glm::vec2 textureDim = glm::vec2(_texture->dimensions());
        if (_textureDimensions != textureDim) {
            float aspectRatio = textureDim.x / textureDim.y;
            float planeAspectRatio = _size.value().x / _size.value().y;

            if (std::abs(planeAspectRatio - aspectRatio) >
                std::numeric_limits<float>::epsilon())
            {
                glm::vec2 newSize =
                    aspectRatio > 0.f ?
                    glm::vec2(_size.value().x * aspectRatio, _size.value().y) :
                    glm::vec2(_size.value().x, _size.value().y * aspectRatio);
                _size = newSize;
            }

            _textureDimensions = textureDim;
        }
    });
}

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

    RenderablePlane::deinitializeGL();
}

void RenderablePlaneImageOnline::bindTexture() {
    if (_texture) {
        _texture->bind();
    }
    else {
        glBindTexture(GL_TEXTURE_2D, 0);
    }
}

void RenderablePlaneImageOnline::update(const UpdateData& data) {
    RenderablePlane::update(data);

    if (!_textureIsDirty) {
        return;
    }

    if (!_imageFuture.valid()) {
        std::future<DownloadManager::MemoryFile> future = downloadImageToMemory(
            _texturePath
        );
        if (future.valid()) {
            _imageFuture = std::move(future);
        }
    }

    if (_imageFuture.valid() && DownloadManager::futureReady(_imageFuture)) {
        DownloadManager::MemoryFile imageFile = _imageFuture.get();

        if (imageFile.corrupted) {
            LERRORC(
                "ScreenSpaceImageOnline",
                fmt::format("Error loading image from URL '{}'", _texturePath)
            );
            return;
        }

        try {
            std::unique_ptr<ghoul::opengl::Texture> texture =
                ghoul::io::TextureReader::ref().loadTexture(
                    reinterpret_cast<void*>(imageFile.buffer),
                    imageFile.size,
                    2,
                    imageFile.format
                );

            if (texture) {
                // Images don't need to start on 4-byte boundaries, for example if the
                // image is only RGB
                glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

                texture->uploadTexture();
                texture->setFilter(ghoul::opengl::Texture::FilterMode::LinearMipMap);
                texture->purgeFromRAM();

                _texture = std::move(texture);
                _textureIsDirty = false;

                if (!_autoScale) {
                    return;
                }

                // Shape the plane based on the aspect ration of the image
                glm::vec2 textureDim = glm::vec2(_texture->dimensions());
                if (_textureDimensions != textureDim) {
                    float aspectRatio = textureDim.x / textureDim.y;
                    float planeAspectRatio = _size.value().x / _size.value().y;

                    if (std::abs(planeAspectRatio - aspectRatio) >
                        std::numeric_limits<float>::epsilon())
                    {
                        glm::vec2 newSize =
                            aspectRatio > 0.f ?
                            glm::vec2(_size.value().x * aspectRatio, _size.value().y) :
                            glm::vec2(_size.value().x, _size.value().y * aspectRatio);
                        _size = newSize;
                    }

                    _textureDimensions = textureDim;
                }
            }
        }
        catch (const ghoul::io::TextureReader::InvalidLoadException& e) {
            _textureIsDirty = false;
            LERRORC(e.component, e.message);
        }
    }
}

std::future<DownloadManager::MemoryFile>
RenderablePlaneImageOnline::downloadImageToMemory(const std::string& url)
{
    return global::downloadManager->fetchFile(
        url,
        [url](const DownloadManager::MemoryFile&) {
            LDEBUGC(
                "ScreenSpaceImageOnline",
                "Download to memory finished for screen space image"
            );
        },
        [url](const std::string& err) {
            LDEBUGC(
                "ScreenSpaceImageOnline",
                "Download to memory failer for screen space image: " + err
            );
        }
    );
}

} // namespace openspace
