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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2025                                                               *
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#include <modules/base/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 <openspace/util/distanceconversion.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",
        "The identifier of a scene graph node with a RenderableNodeLine that this label "
        "should track. The label text will be updating based on the distance from the "
        "node line's start and end.",
        openspace::properties::Property::Visibility::AdvancedUser
    };

    constexpr openspace::properties::Property::PropertyInfo DistanceUnitInfo = {
        "DistanceUnit",
        "Display distance unit",
        "The unit in which the distance value should be displayed. Defaults to 'km' if "
        "not specified.",
        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 selected unit's SI descriptor if not specified.",
        openspace::properties::Property::Visibility::AdvancedUser
    };

    constexpr openspace::properties::Property::PropertyInfo PrecisionInfo = {
        "Precision",
        "Precision",
        "The precision in which to to show the distance number, i.e. the number of "
        "digits after the decimal point.",
        openspace::properties::Property::Visibility::User
    };

    // This `Renderable` creates a label that shows the distance between two nodes, based
    // on an existing [RenderableNodeLine](#base_renderable_nodeline). The label
    // will be placed halfway between the two scene graph nodes that the line connects.
    //
    // The unit in which the distance is displayed can be customized, as well as the
    // precision of the number.
    struct [[codegen::Dictionary(RenderableDistanceLabel)]] Parameters {
        // The identifier of a scene graph node with a
        // [RenderableNodeLine](#base_renderable_nodeline) that this label
        // should track. The label text will be updating based on the distance from the
        // node line's start and end.
        std::string nodeLine;

        // [[codegen::verbatim(DistanceUnitInfo.description)]]
        std::optional<std::string> distanceUnit
            [[codegen::inlist(openspace::distanceUnitList())]];

        // [[codegen::verbatim(CustomUnitDescriptorInfo.description)]]
        std::optional<std::string> customUnitDescriptor;

        // [[codegen::verbatim(PrecisionInfo.description)]]
        std::optional<int> precision [[codegen::greaterequal(0)]];
    };
#include "renderabledistancelabel_codegen.cpp"
} // namespace

namespace openspace {

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

RenderableDistanceLabel::RenderableDistanceLabel(const ghoul::Dictionary& dictionary)
    : RenderableLabel(dictionary)
    , _nodelineId(NodeLineInfo)
    , _distanceUnit(DistanceUnitInfo)
    , _customUnitDescriptor(CustomUnitDescriptorInfo)
    , _precision(PrecisionInfo, 0, 0, 10)
{
    const Parameters p = codegen::bake<Parameters>(dictionary);

    _nodelineId = p.nodeLine;
    addProperty(_nodelineId);

    for (const DistanceUnit u : DistanceUnits) {
        _distanceUnit.addOption(
            static_cast<int>(u),
            std::string(nameForDistanceUnit(u))
        );
    }
    _distanceUnit = static_cast<int>(DistanceUnit::Kilometer);
    if (p.distanceUnit.has_value()) {
        const DistanceUnit unit = distanceUnitFromString(*p.distanceUnit);
        _distanceUnit = static_cast<int>(unit);
    }
    addProperty(_distanceUnit);

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

    _precision = p.precision.value_or(_precision);
    addProperty(_precision);

    // The text will be updated automatically, so set the property to readonly
    _text.setReadOnly(true);
}

void RenderableDistanceLabel::update(const UpdateData&) {
    if (_errorThrown) [[unlikely]] {
        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;
        }

        const DistanceUnit unit = static_cast<DistanceUnit>(_distanceUnit.value());

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

        // Get distance as string
        const double convertedDistance = convertMeters(nodeline->distance(), unit);

        std::string distanceText = std::format(
            "{:.{}f}", convertedDistance, _precision.value()
        );

        // Create final label text and set it
        const std::string finalText = std::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) [[likely]] {
            const glm::dvec3 start = startNode->worldPosition();
            const glm::dvec3 end = endNode->worldPosition();
            const glm::dvec3 goalPos = start + (end - start) / 2.0;
            _transformationMatrix = glm::translate(glm::dmat4(1.0), goalPos);
        }
        else {
            LERROR(std::format(
                "Could not find scene graph node '{}' or '{}'",
                nodeline->start(), nodeline->end()
            ));
        }
    }
    else {
        LERROR(std::format(
            "There is no scenegraph node with id {}", _nodelineId.value()
        ));
        _errorThrown = true;
    }
}

} // namespace openspace