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

#include <modules/base/rendering/renderablenodeline.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 <ghoul/logging/logmanager.h>
#include <optional>
#include <string>

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

    constexpr openspace::properties::Property::PropertyInfo NodeLineInfo = {
        "NodeLine",
        "Node Line",
        "Property to track a nodeline. When tracking the label text will be updating the "
        "distance from the nodeline start and end",
        openspace::properties::Property::Visibility::AdvancedUser
    };

    constexpr openspace::properties::Property::PropertyInfo DistanceUnitInfo = {
        "DistanceUnit",
        "Distance Unit",
        "Property to define the unit in which the distance should be displayed. "
        "Defaults to 'km' if not specified",
        // @VISIBILITY(2.5)
        openspace::properties::Property::Visibility::User
    };

    constexpr openspace::properties::Property::PropertyInfo CustomUnitDescriptorInfo = {
        "CustomUnitDescriptor",
        "Custom Unit Descriptor",
        "Property to define a custom unit descriptor to use to describe the distance "
        "value. Defaults to the units SI descriptor if not specified",
        openspace::properties::Property::Visibility::AdvancedUser
    };

    struct [[codegen::Dictionary(RenderableDistanceLabel)]] Parameters {
        // [[codegen::verbatim(NodeLineInfo.description)]]
        std::string nodeLine;

        // [[codegen::verbatim(DistanceUnitInfo.description)]]
        std::optional<int> distanceUnit;

        // [[codegen::verbatim(CustomUnitDescriptorInfo.description)]]
        std::optional<std::string> customUnitDescriptor;
    };
#include "renderabledistancelabel_codegen.cpp"
} // namespace

namespace openspace {

documentation::Documentation RenderableDistanceLabel::Documentation() {
    return codegen::doc<Parameters>("vislab_renderable_distance_label");
}

RenderableDistanceLabel::RenderableDistanceLabel(const ghoul::Dictionary& dictionary)
    : RenderableLabel(dictionary)
    , _nodelineId(NodeLineInfo)
    , _distanceUnit(DistanceUnitInfo, 1, 0, 11)
    , _customUnitDescriptor(CustomUnitDescriptorInfo)
{
    const Parameters p = codegen::bake<Parameters>(dictionary);

    _nodelineId = p.nodeLine;
    addProperty(_nodelineId);

    _distanceUnit = p.distanceUnit.value_or(_distanceUnit);
    addProperty(_distanceUnit);

    _customUnitDescriptor = p.customUnitDescriptor.value_or(_customUnitDescriptor);
    addProperty(_customUnitDescriptor);
}

void RenderableDistanceLabel::update(const UpdateData&) {
    if (_errorThrown) {
        return;
    }

    RenderEngine& RE = *global::renderEngine;

    SceneGraphNode* nodelineNode = RE.scene()->sceneGraphNode(_nodelineId);
    if (nodelineNode) {
        RenderableNodeLine* nodeline = dynamic_cast<RenderableNodeLine*>(
            nodelineNode->renderable()
        );
        if (!nodeline) {
            LERROR("Expected renderable to be of type 'RenderableNodeLine'");
            _errorThrown = true;
            return;
        }

        // Get used unit scale
        const float scale = unit(_distanceUnit);

        // Get unit descriptor text
        std::string_view unitDescriptor = toString(_distanceUnit);
        if (!_customUnitDescriptor.value().empty()) {
            unitDescriptor = _customUnitDescriptor;
        }

        // Get distance as string and remove fractional part
        std::string distanceText = std::to_string(
            std::round(nodeline->distance() / scale)
        );
        int pos = static_cast<int>(distanceText.find("."));
        std::string subStr = distanceText.substr(pos);
        distanceText.erase(pos, subStr.size());

        // Create final label text and set it
        const std::string finalText = fmt::format("{} {}", distanceText, unitDescriptor);
        setLabelText(finalText);

        // Update placement of label with transformation matrix
        SceneGraphNode* startNode = RE.scene()->sceneGraphNode(nodeline->start());
        SceneGraphNode* endNode = RE.scene()->sceneGraphNode(nodeline->end());
        if (startNode && endNode) {
            glm::dvec3 start = startNode->worldPosition();
            glm::dvec3 end = endNode->worldPosition();
            glm::dvec3 goalPos = start + (end - start) / 2.0;
            _transformationMatrix = glm::translate(glm::dmat4(1.0), goalPos);
        }
        else {
            LERROR(fmt::format(
                "Could not find scene graph node {} or {}",
                nodeline->start(), nodeline->end()
            ));
        }
    }
    else {
        LERROR(fmt::format(
            "There is no scenegraph node with id {}", _nodelineId.value()
        ));
        _errorThrown = true;
    }
}

} // namespace openspace