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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2022                                                               *
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#include <modules/globebrowsing/src/layeradjustment.h>

#include <openspace/documentation/documentation.h>
#include <openspace/documentation/verifier.h>
#include <optional>

namespace {
    constexpr openspace::properties::Property::PropertyInfo ChromaKeyColorInfo = {
        "ChromaKeyColor",
        "Chroma Key Color",
        "This color is used as the chroma key for the layer that is adjusted"
    };

    constexpr openspace::properties::Property::PropertyInfo ChromaKeyToleranceInfo = {
        "ChromaKeyTolerance",
        "Chroma Key Tolerance",
        "This value determines the tolerance that is used to determine whether a color "
        "is matching the selected Chroma key"
    };

    constexpr openspace::properties::Property::PropertyInfo TypeInfo = {
        "Type",
        "Type",
        "The type of layer adjustment that is applied to the underlying layer"
    };

    struct [[codegen::Dictionary(LayerAdjustment)]] Parameters {
        enum class Type {
            None,
            ChromaKey,
            TransferFunction
        };
        // Specifies the type of the adjustment that is applied
        std::optional<Type> type;

        // Specifies the chroma key used when selecting 'ChromaKey' for the 'Type'
        std::optional<glm::vec3> chromaKeyColor [[codegen::color()]];

        // Specifies the tolerance to match the color to the chroma key when the
        // 'ChromaKey' type is selected for the 'Type'
        std::optional<float> chromaKeyTolerance;
    };
#include "layeradjustment_codegen.cpp"
} // namespace

namespace openspace::globebrowsing {

documentation::Documentation LayerAdjustment::Documentation() {
    return codegen::doc<Parameters>("globebrowsing_layeradjustment");
}

LayerAdjustment::LayerAdjustment()
    : properties::PropertyOwner({ "Adjustment" })
    , _chromaKeyColor(ChromaKeyColorInfo, glm::vec3(0.f), glm::vec3(0.f), glm::vec3(1.f))
    , _chromaKeyTolerance(ChromaKeyToleranceInfo, 0.f, 0.f, 1.f)
    , _typeOption(TypeInfo, properties::OptionProperty::DisplayType::Dropdown)
{
    // Add options to option properties
    for (const layers::Adjustment& ai : layers::Adjustments) {
        _typeOption.addOption(static_cast<int>(ai.id), std::string(ai.identifier));
    }
    _typeOption.setValue(static_cast<int>(layers::Adjustment::ID::None));
    _type = static_cast<layers::Adjustment::ID>(_typeOption.value());

    _typeOption.onChange([&]() {
        switch (type()) {
            case layers::Adjustment::ID::None:
                break;
            case layers::Adjustment::ID::ChromaKey:
                removeProperty(_chromaKeyColor);
                removeProperty(_chromaKeyTolerance);
                break;
            case layers::Adjustment::ID::TransferFunction:
                break;
        }
        _type = static_cast<layers::Adjustment::ID>(_typeOption.value());
        addVisibleProperties();
        if (_onChangeCallback) {
            _onChangeCallback();
        }
    });
    _chromaKeyColor.setViewOption(properties::Property::ViewOptions::Color);

    addProperty(_typeOption);
    addVisibleProperties();
}

void LayerAdjustment::setValuesFromDictionary(const ghoul::Dictionary& adjustmentDict) {
    const Parameters p = codegen::bake<Parameters>(adjustmentDict);

    if (p.type.has_value()) {
        switch (*p.type) {
            case Parameters::Type::None:
                _typeOption = static_cast<int>(layers::Adjustment::ID::None);
                break;
            case Parameters::Type::ChromaKey:
                _typeOption = static_cast<int>(layers::Adjustment::ID::ChromaKey);
                break;
            case Parameters::Type::TransferFunction:
                _typeOption = static_cast<int>(layers::Adjustment::ID::TransferFunction);
                break;
            default:
                throw ghoul::MissingCaseException();
        }
    }

    _chromaKeyColor = p.chromaKeyColor.value_or(_chromaKeyColor);
    _chromaKeyTolerance = p.chromaKeyTolerance.value_or(_chromaKeyTolerance);
}

layers::Adjustment::ID LayerAdjustment::type() const {
    return _type;
}

void LayerAdjustment::addVisibleProperties() {
    switch (type()) {
        case layers::Adjustment::ID::None:
            break;
        case layers::Adjustment::ID::ChromaKey:
            addProperty(_chromaKeyColor);
            addProperty(_chromaKeyTolerance);
            break;
        case layers::Adjustment::ID::TransferFunction:
            break;
    }
}

glm::vec3 LayerAdjustment::chromaKeyColor() const {
    return _chromaKeyColor;
}

float LayerAdjustment::chromaKeyTolerance() const {
    return _chromaKeyTolerance;
}

void LayerAdjustment::onChange(std::function<void(void)> callback) {
    _onChangeCallback = std::move(callback);
}

} // namespace openspace::globebrowsing
