#include <mbgl/renderer/render_symbol_layer.hpp>
#include <mbgl/layout/symbol_layout.hpp>
#include <mbgl/renderer/bucket.hpp>
#include <mbgl/renderer/bucket_parameters.hpp>
#include <mbgl/style/layers/symbol_layer_impl.hpp>
#include <mbgl/style/property_evaluation_parameters.hpp>
#include <mbgl/tile/geometry_tile_data.hpp>

namespace mbgl {

RenderSymbolLayer::RenderSymbolLayer(const style::SymbolLayer::Impl& _impl)
        : RenderLayer(style::LayerType::Symbol, _impl),
          impl(&_impl) {
}

std::unique_ptr<RenderLayer> RenderSymbolLayer::clone() const {
    return std::make_unique<RenderSymbolLayer>(*this);
}

std::unique_ptr<Bucket> RenderSymbolLayer::createBucket(const BucketParameters&, const std::vector<const RenderLayer*>&) const {
    assert(false); // Should be calling createLayout() instead.
    return nullptr;
}

std::unique_ptr<SymbolLayout> RenderSymbolLayer::createLayout(const BucketParameters& parameters,
                                                              const std::vector<const RenderLayer*>& group,
                                                              const GeometryTileLayer& layer,
                                                              GlyphDependencies& glyphDependencies,
                                                              IconDependencies& iconDependencies) const {
    return std::make_unique<SymbolLayout>(parameters,
                                          group,
                                          layer,
                                          iconDependencies,
                                          glyphDependencies);
}

void RenderSymbolLayer::cascade(const style::CascadeParameters& parameters) {
    unevaluated = impl->cascading.cascade(parameters, std::move(unevaluated));
}

bool RenderSymbolLayer::evaluate(const style::PropertyEvaluationParameters& parameters) {
    evaluated = unevaluated.evaluate(parameters);

    auto hasIconOpacity = evaluated.get<style::IconColor>().constantOr(Color::black()).a > 0 ||
                          evaluated.get<style::IconHaloColor>().constantOr(Color::black()).a > 0;
    auto hasTextOpacity = evaluated.get<style::TextColor>().constantOr(Color::black()).a > 0 ||
                          evaluated.get<style::TextHaloColor>().constantOr(Color::black()).a > 0;

    passes = ((evaluated.get<style::IconOpacity>().constantOr(1) > 0 && hasIconOpacity && iconSize > 0)
              || (evaluated.get<style::TextOpacity>().constantOr(1) > 0 && hasTextOpacity && textSize > 0))
             ? RenderPass::Translucent : RenderPass::None;

    return unevaluated.hasTransition();
}


style::IconPaintProperties::Evaluated RenderSymbolLayer::iconPaintProperties() const {
    return style::IconPaintProperties::Evaluated {
            evaluated.get<style::IconOpacity>(),
            evaluated.get<style::IconColor>(),
            evaluated.get<style::IconHaloColor>(),
            evaluated.get<style::IconHaloWidth>(),
            evaluated.get<style::IconHaloBlur>(),
            evaluated.get<style::IconTranslate>(),
            evaluated.get<style::IconTranslateAnchor>()
    };
}

style::TextPaintProperties::Evaluated RenderSymbolLayer::textPaintProperties() const {
    return style::TextPaintProperties::Evaluated {
            evaluated.get<style::TextOpacity>(),
            evaluated.get<style::TextColor>(),
            evaluated.get<style::TextHaloColor>(),
            evaluated.get<style::TextHaloWidth>(),
            evaluated.get<style::TextHaloBlur>(),
            evaluated.get<style::TextTranslate>(),
            evaluated.get<style::TextTranslateAnchor>()
    };
}


style::SymbolPropertyValues RenderSymbolLayer::iconPropertyValues(const style::SymbolLayoutProperties::PossiblyEvaluated& layout_) const {
    return style::SymbolPropertyValues {
            layout_.get<style::IconRotationAlignment>(), // icon-pitch-alignment is not yet implemented; inherit the rotation alignment
            layout_.get<style::IconRotationAlignment>(),
            layout_.get<style::IconSize>(),
            evaluated.get<style::IconTranslate>(),
            evaluated.get<style::IconTranslateAnchor>(),
            iconSize,
            1.0f,
            evaluated.get<style::IconHaloColor>().constantOr(Color::black()).a > 0 &&
            evaluated.get<style::IconHaloWidth>().constantOr(1),
            evaluated.get<style::IconColor>().constantOr(Color::black()).a > 0
    };
}

style::SymbolPropertyValues RenderSymbolLayer::textPropertyValues(const style::SymbolLayoutProperties::PossiblyEvaluated& layout_) const {
    return style::SymbolPropertyValues {
            layout_.get<style::TextPitchAlignment>(),
            layout_.get<style::TextRotationAlignment>(),
            layout_.get<style::TextSize>(),
            evaluated.get<style::TextTranslate>(),
            evaluated.get<style::TextTranslateAnchor>(),
            textSize,
            24.0f,
            evaluated.get<style::TextHaloColor>().constantOr(Color::black()).a > 0 &&
            evaluated.get<style::TextHaloWidth>().constantOr(1),
            evaluated.get<style::TextColor>().constantOr(Color::black()).a > 0
    };
}

} // namespace mbgl