#ifndef LLMR_RENDERER_PAINTER
#define LLMR_RENDERER_PAINTER

#include <llmr/map/tile_data.hpp>
#include <llmr/geometry/vao.hpp>
#include <llmr/geometry/vertex_buffer.hpp>
#include <llmr/util/mat4.hpp>
#include <llmr/util/noncopyable.hpp>
#include <llmr/renderer/frame_history.hpp>

#include <llmr/shader/plain_shader.hpp>
#include <llmr/shader/outline_shader.hpp>
#include <llmr/shader/pattern_shader.hpp>
#include <llmr/shader/line_shader.hpp>
#include <llmr/shader/linejoin_shader.hpp>
#include <llmr/shader/point_shader.hpp>
#include <llmr/shader/raster_shader.hpp>
#include <llmr/shader/text_shader.hpp>

namespace llmr {

class Transform;
class Settings;
class Style;
class Tile;

class FillBucket;
class LineBucket;
class PointBucket;
class TextBucket;

class Painter : private util::noncopyable {
public:
    Painter(Transform& transform, Settings& settings, Style& style, GlyphAtlas& glyphAtlas);

    void setup();
    void clear();
    void changeMatrix();
    void render(const Tile& tile);
    void renderMatte();
    void renderFill(FillBucket& bucket, const std::string& layer_name, const Tile::ID& id);
    void renderLine(LineBucket& bucket, const std::string& layer_name, const Tile::ID& id);
    void renderPoint(PointBucket& bucket, const std::string& layer_name, const Tile::ID& id);
    void renderText(TextBucket& bucket, const std::string& layer_name, const Tile::ID& id);

    void resize();

    void prepareClippingMask();
    void drawClippingMask(const mat4& matrix, uint8_t clip_id, bool opaque = true);
    void finishClippingMask();

    bool needsAnimation() const;
private:
    void setupShaders();
    void renderRaster(const std::shared_ptr<TileData>& tile);
    void renderLayers(const std::shared_ptr<TileData>& tile, const std::vector<LayerDescription>& layers);
    void renderLayer(const std::shared_ptr<TileData>& tile_data, const LayerDescription& layer_desc);
    void renderDebug(const std::shared_ptr<TileData>& tile);

    void useProgram(uint32_t program);
    void lineWidth(float lineWidth);
    void depthMask(bool value);

public:
    mat4 matrix;
    mat4 projMatrix;
    mat4 nativeMatrix;
    mat4 extrudeMatrix;

private:
    Transform& transform;
    Settings& settings;
    Style& style;
    GlyphAtlas& glyphAtlas;

    FrameHistory frameHistory;

    uint32_t gl_program = 0;
    float gl_lineWidth = 0;
    bool gl_depthMask = true;
    float strata = 0;
    const float strata_epsilon = 1.0f / (1 << 16);
    enum { Opaque, Translucent } pass = Opaque;

    std::unique_ptr<PlainShader> plainShader;
    std::unique_ptr<OutlineShader> outlineShader;
    std::unique_ptr<LineShader> lineShader;
    std::unique_ptr<LinejoinShader> linejoinShader;
    std::unique_ptr<PatternShader> patternShader;
    std::unique_ptr<PointShader> pointShader;
    std::unique_ptr<RasterShader> rasterShader;
    std::unique_ptr<TextShader> textShader;

    // Set up the stencil quad we're using to generate the stencil mask.
    VertexBuffer tileStencilBuffer = {
        // top left triangle
        0, 0,
        4096, 0,
        0, 4096,

        // bottom right triangle
        4096, 0,
        0, 4096,
        4096, 4096
    };

    VertexArrayObject coveringPlainArray;
    VertexArrayObject coveringPatternArray;
    VertexArrayObject coveringRasterArray;

    // Set up the tile boundary lines we're using to draw the tile outlines.
    VertexBuffer tileBorderBuffer = {
        0, 0,
        4096, 0,
        4096, 4096,
        0, 4096,
        0, 0
    };

    VertexArrayObject tileBorderArray;

    // Set up the matte buffer we're using to draw the filling background.
    VertexBuffer matteBuffer = {
        // top left triangle
        0, 0,
        1920, 0,
        0, 1080,

        // bottom right triangle
        1920, 0,
        0, 1080,
        1920, 1080
    };

    VertexArrayObject matteArray;
};

}

#endif