#pragma once

#include <GL/glew.h>
#include <imgui.h>
#include "pass/MainProgram.hpp"
#include "pass/SkyProgram.hpp"
#include "pass/Context.hpp"

class Camera;
/// Handle rendering passes and params
class Renderer {
public:
    /// Rendering options
    struct options {
        /// Main pass
        pass::MainProgram::options main;
        /// Display skybox
        bool skybox = false;
        /// Display only wires
        bool wireframe = false;
        /// Texture pack name
        std::string textures = "1024-realistic";
        /// Textures quality
        float mipMapLOD = -.5;
        /// Depth color
        ImVec4 clear_color;
    };

    Renderer(const options&);
    Renderer(Renderer &&) = delete;
    Renderer(const Renderer &) = delete;
    Renderer &operator=(Renderer &&) = delete;
    Renderer &operator=(const Renderer &) = delete;
    ~Renderer();

    glm::vec3 LightInvDir = glm::vec3(0.5f, 2, 2);
    glm::vec3 FogColor;
    GLfloat FogDepth;

    bool SkyEnable;

    glm::mat4 getProjectionMatrix() const {
        return ProjectionMatrix;
    }
    glm::mat4 getViewMatrix() const {
        return ViewMatrix;
    }

    GLuint getTextureAtlas() const {
        return TextureAtlas;
    }
    GLuint getNormalAtlas() const {
        return NormalAtlas;
    }
    GLuint getHOSAtlas() const {
        return HOSAtlas;
    }
    GLuint getSkyTexture() const {
        return Skybox;
    }

    /// Get main pass with context
    pass::Context getPass();
    /// Apply postprocessing
    void postProcess();

    /// Apply camera matrices
    void lookFrom(const Camera&);
    void reloadShaders(const pass::MainProgram::options &);
    void reloadTextures(const std::string &, float mipMapLOD = 0);

private:
    GLuint VertexArrayID;

    pass::MainProgram *MainPass;
    pass::SkyProgram *SkyPass;

    glm::mat4 ProjectionMatrix;
    glm::mat4 ViewMatrix;

    GLuint TextureAtlas;
    GLuint NormalAtlas;
    GLuint HOSAtlas;
    GLuint Skybox;

    void loadTextures(const std::string &, float mipMapLOD = 0);
    void unloadTextures();
};