#pragma once

#include <mbgl/text/quads.hpp>
#include <mbgl/text/glyph_atlas.hpp>
#include <mbgl/text/collision_feature.hpp>
#include <mbgl/style/layers/symbol_layer_properties.hpp>
#include <mbgl/util/traits.hpp>
#include <mbgl/util/util.hpp>

namespace mbgl {

class Anchor;
class IndexedSubfeature;

struct ShapedTextOrientations {
    Shaping horizontal;
    Shaping vertical;
    // The following are used with variable text placement on.
    Shaping& right = horizontal; 
    Shaping center;
    Shaping left;
    bool singleLine = false;
};

struct SymbolInstanceSharedData {
    SymbolInstanceSharedData(GeometryCoordinates line,
                            const ShapedTextOrientations& shapedTextOrientations,
                            const optional<PositionedIcon>& shapedIcon,
                            const optional<PositionedIcon>& verticallyShapedIcon,
                            const style::SymbolLayoutProperties::Evaluated& layout,
                            const style::SymbolPlacementType textPlacement,
                            const std::array<float, 2>& textOffset,
                            const GlyphPositions& positions,
                            bool allowVerticalPlacement);
    bool empty() const;
    GeometryCoordinates line;
    // Note: When singleLine == true, only `rightJustifiedGlyphQuads` is populated.
    SymbolQuads rightJustifiedGlyphQuads;
    SymbolQuads centerJustifiedGlyphQuads;
    SymbolQuads leftJustifiedGlyphQuads;
    SymbolQuads verticalGlyphQuads;
    optional<SymbolQuad> iconQuad;
    optional<SymbolQuad> verticalIconQuad;
};

enum class SymbolContent : uint8_t {
    None = 0,
    Text = 1 << 0,
    IconRGBA = 1 << 1,
    IconSDF = 1 << 2
};

MBGL_CONSTEXPR SymbolContent operator|(SymbolContent a, SymbolContent b) {
    return SymbolContent(mbgl::underlying_type(a) | mbgl::underlying_type(b));
}

MBGL_CONSTEXPR SymbolContent& operator|=(SymbolContent& a, SymbolContent b) {
    return (a = a | b);
}

MBGL_CONSTEXPR SymbolContent operator&(SymbolContent a, SymbolContent b) {
    return SymbolContent(mbgl::underlying_type(a) & mbgl::underlying_type(b));
}

class SymbolInstance {
public:
    SymbolInstance(Anchor& anchor_,
                   std::shared_ptr<SymbolInstanceSharedData> sharedData,
                   const ShapedTextOrientations& shapedTextOrientations,
                   const optional<PositionedIcon>& shapedIcon,
                   const optional<PositionedIcon>& verticallyShapedIcon,
                   const float textBoxScale,
                   const float textPadding,
                   const style::SymbolPlacementType textPlacement,
                   const std::array<float, 2>& textOffset,
                   const float iconBoxScale,
                   const float iconPadding,
                   const std::array<float, 2>& iconOffset,
                   const IndexedSubfeature& indexedFeature,
                   const std::size_t layoutFeatureIndex,
                   const std::size_t dataFeatureIndex,
                   std::u16string key,
                   const float overscaling,
                   const float iconRotation,
                   const float textRotation,
                   float radialTextOffset,
                   bool allowVerticalPlacement,
                   const SymbolContent iconType = SymbolContent::None);

    optional<size_t> getDefaultHorizontalPlacedTextIndex() const;
    const GeometryCoordinates& line() const;
    const SymbolQuads& rightJustifiedGlyphQuads() const;
    const SymbolQuads& leftJustifiedGlyphQuads() const;
    const SymbolQuads& centerJustifiedGlyphQuads() const;
    const SymbolQuads& verticalGlyphQuads() const;
    bool hasText() const;
    bool hasIcon() const;
    bool hasSdfIcon() const;
    const optional<SymbolQuad>& iconQuad() const;
    const optional<SymbolQuad>& verticalIconQuad() const;
    void releaseSharedData();

private:
    std::shared_ptr<SymbolInstanceSharedData> sharedData;

public:
    Anchor anchor;
    SymbolContent symbolContent;

    std::size_t rightJustifiedGlyphQuadsSize;
    std::size_t centerJustifiedGlyphQuadsSize;
    std::size_t leftJustifiedGlyphQuadsSize;
    std::size_t verticalGlyphQuadsSize;

    CollisionFeature textCollisionFeature;
    CollisionFeature iconCollisionFeature;
    optional<CollisionFeature> verticalTextCollisionFeature = nullopt;
    optional<CollisionFeature> verticalIconCollisionFeature = nullopt;
    WritingModeType writingModes;
    std::size_t layoutFeatureIndex; // Index into the set of features included at layout time
    std::size_t dataFeatureIndex;   // Index into the underlying tile data feature set
    std::array<float, 2> textOffset;
    std::array<float, 2> iconOffset;
    std::u16string key;
    bool isDuplicate;
    optional<size_t> placedRightTextIndex;
    optional<size_t> placedCenterTextIndex;
    optional<size_t> placedLeftTextIndex;
    optional<size_t> placedVerticalTextIndex;
    optional<size_t> placedIconIndex;
    optional<size_t> placedVerticalIconIndex;
    float textBoxScale;
    float radialTextOffset;
    bool singleLine;
    uint32_t crossTileID = 0;
};

} // namespace mbgl