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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2025                                                               *
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#include <modules/base/rendering/screenspaceimageonline.h>

#include <openspace/documentation/documentation.h>
#include <openspace/documentation/verifier.h>
#include <openspace/engine/globals.h>
#include <openspace/engine/downloadmanager.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/programobject.h>
#include <optional>

namespace {
    constexpr std::string_view _loggerCat = "ScreenSpaceImageOnline";

    constexpr openspace::properties::Property::PropertyInfo TextureInfo = {
        "URL",
        "Image URL",
        "The URL of the texture to be displayed on this screen space plane. If changed, "
        "the image at the new path will automatically be loaded and displayed. The "
        "default size of the plane will be set based on the size of the image.",
        openspace::properties::Property::Visibility::User
    };

    // This `ScreenSpaceRenderable` can be used to display an image from a web URL.
    //
    // To load an image from a local file on disk, see
    // [`ScreenSpaceImageLocal`](#base_screenspace_image_local).
    struct [[codegen::Dictionary(ScreenSpaceImageOnline)]] Parameters {
        std::optional<std::string> identifier;

        // [[codegen::verbatim(TextureInfo.description)]]
        std::optional<std::string> url [[codegen::key("URL")]];
    };
#include "screenspaceimageonline_codegen.cpp"
} // namespace

namespace openspace {

documentation::Documentation ScreenSpaceImageOnline::Documentation() {
    return codegen::doc<Parameters>("base_screenspace_image_online");
}

ScreenSpaceImageOnline::ScreenSpaceImageOnline(const ghoul::Dictionary& dictionary)
    : ScreenSpaceRenderable(dictionary)
    , _textureIsDirty(false)
    , _texturePath(TextureInfo)
{
    const Parameters p = codegen::bake<Parameters>(dictionary);

    std::string identifier = p.identifier.value_or("ScreenSpaceImageOnline");
    setIdentifier(makeUniqueIdentifier(std::move(identifier)));

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

ScreenSpaceImageOnline::~ScreenSpaceImageOnline() {}

bool ScreenSpaceImageOnline::deinitializeGL() {
    _texture = nullptr;

    return ScreenSpaceRenderable::deinitializeGL();
}

void ScreenSpaceImageOnline::update() {
    if (!_textureIsDirty) [[likely]] {
        return;
    }

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

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

        if (imageFile.corrupted) {
            LERROR(std::format(
                "Error loading image from URL '{}'", _texturePath.value()
            ));
            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);

                if (texture->format() == ghoul::opengl::Texture::Format::Red) {
                    texture->setSwizzleMask({ GL_RED, GL_RED, GL_RED, GL_ONE });
                }

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

                _texture = std::move(texture);
                _objectSize = _texture->dimensions();
                _textureIsDirty = false;
            }
        }
        catch (const ghoul::io::TextureReader::InvalidLoadException& e) {
            _textureIsDirty = false;
            LERRORC(e.component, e.message);
        }
    }   
}

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

void ScreenSpaceImageOnline::bindTexture() {
    if (_texture) [[likely]] {
        _texture->bind();
    }
}

} // namespace openspace