path: root/src/AssetManager.hpp

#pragma once

#include <map>
#include <optional>

#include <GL/glew.h>
#include <glm/vec4.hpp>
#include <nlohmann/json.hpp>

#include "Block.hpp"
#include "Texture.hpp"
#include "Vector.hpp"

struct TextureCoordinates {
	TextureCoordinates(float x = -1, float y = -1, float w = -1, float h = -1) : x(x), y(y), w(w), h(h) {}

	bool operator==(const TextureCoordinates &rhs) const {
		return x == rhs.x &&
		       y == rhs.y &&
		       w == rhs.w &&
		       h == rhs.h;
	}

	explicit operator bool() const {
		return !(*this == TextureCoordinates(-1, -1, -1, -1));
	}

	double x, y, w, h;

    operator glm::vec4() const {
        return glm::vec4(x, y, w, h);
    }
};

struct BlockTextureId {
	//Block sides: 0 - bottom, 1 - top, 2 - north, 3 - south, 4 - west, 5 - east 6 - every side
	BlockTextureId(int id = 0, int state = 0, int side = 6) : id(id), state(state), side(side) {}

	int id:9;
	int state:4;
	int side:3;


	bool operator<(const BlockTextureId &rhs) const {
		if (id < rhs.id)
			return true;
		if (rhs.id < id)
			return false;
		if (state < rhs.state)
			return true;
		if (rhs.state < state)
			return false;
		return side < rhs.side;
	}
};

struct BlockModel {
    bool AmbientOcclusion=true;

    enum DisplayVariants {
        thirdperson_righthand,
        thirdperson_lefthand,
        firstperson_righthand,
        firstperson_lefthand,
        gui,
        head,
        ground,
        fixed,
        DisplayVariantsCount,
    };
    struct DisplayData {
        Vector rotation;
        Vector translation;
        Vector scale;
    };
    std::map<DisplayVariants, DisplayData> Display;

    std::map<std::string, std::string> Textures;

    struct ElementData {
        Vector from;
        Vector to;

        Vector rotationOrigin = Vector(8, 8, 8);
        enum Axis {
            x,
            y,
            z,
        } rotationAxis = Axis::x;
        int rotationAngle = 0;
        bool rotationRescale = false;

        bool shade = true;

        enum FaceDirection {
            down,
            up,
            north,
            south,
            west,
            east,
            none,
        };
        struct FaceData {
            struct Uv {
                int x1, y1, x2, y2;
            } uv = { 0,0,0,0 };
            std::string texture;
            FaceDirection cullface = FaceDirection::none;
            int rotation = 0;
            bool tintIndex = false;
            
        };
        std::map<FaceDirection, FaceData> faces;
    };

    std::vector<ElementData> Elements;
};

class AssetManager {
	Texture *textureAtlas;
	std::map<std::string, BlockId> assetIds;
	std::map<std::string, TextureCoordinates> assetTextures;
	std::map<BlockTextureId,glm::vec4> textureAtlasIndexes;
    std::map<std::string, BlockModel> models;
public:
	AssetManager();

	~AssetManager();

	void LoadTextureResources();

	TextureCoordinates GetTextureByAssetName(std::string AssetName);

	std::string GetTextureAssetNameByBlockId(BlockTextureId block);

	GLuint GetTextureAtlas();

	const std::map<BlockTextureId,glm::vec4> &GetTextureAtlasIndexes();

	void LoadIds();

	TextureCoordinates GetTextureByBlock(BlockTextureId block);

	static AssetManager& Instance();

    const BlockModel *GetBlockModelByBlockId(BlockId block);

    void LoadBlockModels();
};