/*****************************************************************************************
 *                                                                                       *
 * OpenSpace                                                                             *
 *                                                                                       *
 * Copyright (c) 2014-2025                                                               *
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 ****************************************************************************************/

#include <modules/base/rendering/renderabledisc.h>

#include <openspace/documentation/documentation.h>
#include <openspace/documentation/verifier.h>
#include <openspace/engine/globals.h>
#include <openspace/rendering/renderengine.h>
#include <openspace/scene/scene.h>
#include <openspace/util/updatestructures.h>
#include <ghoul/filesystem/filesystem.h>
#include <ghoul/logging/logmanager.h>
#include <ghoul/opengl/openglstatecache.h>
#include <ghoul/opengl/programobject.h>
#include <ghoul/opengl/textureunit.h>
#include <filesystem>
#include <optional>

namespace {
    constexpr openspace::properties::Property::PropertyInfo TextureInfo = {
        "Texture",
        "Texture",
        "The path to a file with a one-dimensional texture to be used for the disc "
        "color. The leftmost color will be innermost color when rendering the disc, "
        "and the rightmost color will be the outermost color.",
        openspace::properties::Property::Visibility::User
    };

    constexpr openspace::properties::Property::PropertyInfo SizeInfo = {
        "Size",
        "Size",
        "The outer radius of the disc, in meters.",
        openspace::properties::Property::Visibility::User
    };

    constexpr openspace::properties::Property::PropertyInfo WidthInfo = {
        "Width",
        "Width",
        "The disc width, given as a ratio of the full disc radius. For example, a value "
        "of 1 results in a full circle, while 0.5 results in a disc where the inner "
        "radius is half of the full radius.",
        openspace::properties::Property::Visibility::AdvancedUser
    };

    // This renderable can be used to create a circular disc that is colored based on a
    // one-dimensional texture.
    //
    // The disc will be filled i.e. a full circle, per default, but may also be made
    // with a hole in the center using the `Width` parameter.
    struct [[codegen::Dictionary(RenderableDisc)]] Parameters {
        // [[codegen::verbatim(TextureInfo.description)]]
        std::filesystem::path texture;

        // [[codegen::verbatim(SizeInfo.description)]]
        std::optional<float> size;

        // [[codegen::verbatim(WidthInfo.description)]]
        std::optional<float> width [[codegen::inrange(0.0, 1.0)]];
    };
#include "renderabledisc_codegen.cpp"
} // namespace

namespace openspace {

documentation::Documentation RenderableDisc::Documentation() {
    return codegen::doc<Parameters>("base_renderable_disc");
}

RenderableDisc::RenderableDisc(const ghoul::Dictionary& dictionary)
    : Renderable(dictionary)
    , _texturePath(TextureInfo)
    , _size(SizeInfo, 1.f, 0.001f, 1e13f)
    , _width(WidthInfo, 1.f, 0.001f, 1.f)
    , _plane(_size)
    , _planeIsDirty(true)
{
    const Parameters p = codegen::bake<Parameters>(dictionary);

    addProperty(Fadeable::_opacity);

    _texturePath = p.texture.string();
    _texturePath.onChange([this]() { _texture->loadFromFile(_texturePath.value()); });
    addProperty(_texturePath);

    _size.setExponent(7.f);
    _size = p.size.value_or(_size);
    setBoundingSphere(_size);
    _size.onChange([this]() { _planeIsDirty = true; });
    addProperty(_size);

    _width = p.width.value_or(_width);
    addProperty(_width);

    setRenderBin(Renderable::RenderBin::PostDeferredTransparent);
}

bool RenderableDisc::isReady() const {
    return _shader && _texture;
}

void RenderableDisc::initialize() {
    _texture = std::make_unique<TextureComponent>(1);
    _texture->setFilterMode(ghoul::opengl::Texture::FilterMode::AnisotropicMipMap);
    _texture->setWrapping(ghoul::opengl::Texture::WrappingMode::ClampToEdge);
    _texture->setShouldWatchFileForChanges(true);
}

void RenderableDisc::initializeGL() {
    initializeShader();

    _texture->loadFromFile(_texturePath.value());
    _texture->uploadToGpu();

    _plane.initialize();
}

void RenderableDisc::deinitializeGL() {
    _plane.deinitialize();
    _texture = nullptr;

    global::renderEngine->removeRenderProgram(_shader.get());
    _shader = nullptr;
}

void RenderableDisc::render(const RenderData& data, RendererTasks&) {
    _shader->activate();

    const glm::dmat4 modelViewProjectionTransform =
        calcModelViewProjectionTransform(data);

    _shader->setUniform(
        _uniformCache.modelViewProjectionTransform,
        glm::mat4(modelViewProjectionTransform)
    );
    _shader->setUniform(_uniformCache.width, _width);
    _shader->setUniform(_uniformCache.opacity, opacity());

    ghoul::opengl::TextureUnit unit;
    unit.activate();
    _texture->bind();
    _shader->setUniform(_uniformCache.colorTexture, unit);

    glEnablei(GL_BLEND, 0);
    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    glDepthMask(false);
    glDisable(GL_CULL_FACE);

    _plane.render();

    _shader->deactivate();

    // Restores GL State
    global::renderEngine->openglStateCache().resetBlendState();
    global::renderEngine->openglStateCache().resetDepthState();
    global::renderEngine->openglStateCache().resetPolygonAndClippingState();
}

void RenderableDisc::update(const UpdateData&) {
    if (_shader->isDirty()) [[unlikely]] {
        _shader->rebuildFromFile();
        updateUniformLocations();
    }

    if (_planeIsDirty) [[unlikely]] {
        _plane.updateSize(planeSize());
        _planeIsDirty = false;
    }

    _texture->update();
}

void RenderableDisc::initializeShader() {
    _shader = global::renderEngine->buildRenderProgram(
        "DiscProgram",
        absPath("${MODULE_BASE}/shaders/disc_vs.glsl"),
        absPath("${MODULE_BASE}/shaders/disc_fs.glsl")
    );
    updateUniformLocations();
}

void RenderableDisc::updateUniformLocations() {
   ghoul::opengl::updateUniformLocations(*_shader, _uniformCache);
}

float RenderableDisc::planeSize() const {
    return _size;
}

} // namespace openspace