#pragma once

#include <array>
#include <span>

#include "PICA/float_types.hpp"
#include "PICA/pica_vertex.hpp"
#include "PICA/regs.hpp"
#include "gl_state.hpp"
#include "helpers.hpp"
#include "logger.hpp"
#include "renderer.hpp"
#include "surface_cache.hpp"
#include "textures.hpp"

// More circular dependencies!
class GPU;

class RendererGL final : public Renderer {
	GLStateManager gl = {};

	OpenGL::Program triangleProgram;
	OpenGL::Program displayProgram;

	OpenGL::VertexArray vao;
	OpenGL::VertexBuffer vbo;

	// TEV configuration uniform locations
	GLint textureEnvSourceLoc = -1;
	GLint textureEnvOperandLoc = -1;
	GLint textureEnvCombinerLoc = -1;
	GLint textureEnvColorLoc = -1;
	GLint textureEnvScaleLoc = -1;

	// Uniform of PICA registers
	GLint picaRegLoc = -1;

	// Depth configuration uniform locations
	GLint depthOffsetLoc = -1;
	GLint depthScaleLoc = -1;
	GLint depthmapEnableLoc = -1;

	float oldDepthScale = -1.0;
	float oldDepthOffset = 0.0;
	bool oldDepthmapEnable = false;

	SurfaceCache<DepthBuffer, 16, true> depthBufferCache;
	SurfaceCache<ColourBuffer, 16, true> colourBufferCache;
	SurfaceCache<Texture, 256, true> textureCache;

	// Dummy VAO/VBO for blitting the final output
	OpenGL::VertexArray dummyVAO;
	OpenGL::VertexBuffer dummyVBO;

	OpenGL::Texture screenTexture;
	GLuint lightLUTTextureArray;
	OpenGL::Framebuffer screenFramebuffer;
	OpenGL::Texture blankTexture;

	OpenGL::Framebuffer getColourFBO();
	OpenGL::Texture getTexture(Texture& tex);

	MAKE_LOG_FUNCTION(log, rendererLogger)
	void setupBlending();
	void setupStencilTest(bool stencilEnable);
	void bindDepthBuffer();
	void setupTextureEnvState();
	void bindTexturesToSlots();
	void updateLightingLUT();

  public:
	RendererGL(GPU& gpu, const std::array<u32, regNum>& internalRegs, const std::array<u32, extRegNum>& externalRegs)
		: Renderer(gpu, internalRegs, externalRegs) {}
	~RendererGL() override;

	void reset() override;
	void display() override;                                                              // Display the 3DS screen contents to the window
	void initGraphicsContext(SDL_Window* window) override;                                // Initialize graphics context
	void clearBuffer(u32 startAddress, u32 endAddress, u32 value, u32 control) override;  // Clear a GPU buffer in VRAM
	void displayTransfer(u32 inputAddr, u32 outputAddr, u32 inputSize, u32 outputSize, u32 flags) override;  // Perform display transfer
	void textureCopy(u32 inputAddr, u32 outputAddr, u32 totalBytes, u32 inputSize, u32 outputSize, u32 flags) override;
	void drawVertices(PICA::PrimType primType, std::span<const PICA::Vertex> vertices) override;             // Draw the given vertices

	std::optional<ColourBuffer> getColourBuffer(u32 addr, PICA::ColorFmt format, u32 width, u32 height, bool createIfnotFound = true);

	// Take a screenshot of the screen and store it in a file
	void screenshot(const std::string& name) override;
};
