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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2020                                                               *
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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."
    };
} // namespace

namespace openspace {

documentation::Documentation RenderablePlaneImageOnline::Documentation() {
    using namespace documentation;
    return {
        "Renderable Plane Image Online",
        "base_renderable_plane_image_online",
        {
            {
                TextureInfo.identifier,
                new StringVerifier,
                Optional::No,
                TextureInfo.description,
            }
        }
    };
}

RenderablePlaneImageOnline::RenderablePlaneImageOnline(
                                                      const ghoul::Dictionary& dictionary)
    : RenderablePlane(dictionary)
    , _texturePath(TextureInfo)
{
    documentation::testSpecificationAndThrow(
        Documentation(),
        dictionary,
        "RenderablePlaneImageOnline"
    );

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

    std::string texturePath;
    if (dictionary.hasKey(TextureInfo.identifier)) {
        _texturePath = dictionary.value<std::string>(TextureInfo.identifier);
    }

    addProperty(_texturePath);
}

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&) {
    if (_textureIsDirty) {
        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,
                        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;
                }
            }
            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