#pragma once

#include "imgui.h"
#include "GLFW/glfw3.h"

class pixel_shader_drawer;
class shader;
class render_target;
class texture;
constexpr ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
constexpr float clear_color_with_alpha[4] = {
    clear_color.x * clear_color.w, clear_color.y * clear_color.w, clear_color.z * clear_color.w, clear_color.w
};

class renderer {
public:
    virtual ~renderer() = default;

    virtual void pre_init() {
    }

    virtual bool init(GLFWwindow* window_handle) = 0;

    virtual void shutdown();

    virtual void post_shutdown() {
    }

    virtual std::shared_ptr<shader> load_shader(const std::string& entry_name) = 0;

    virtual std::shared_ptr<shader> get_pixel_shader_render_default_vs();

    virtual std::shared_ptr<pixel_shader_drawer> create_pixel_shader_drawer() = 0;

    virtual void new_frame(GLFWwindow* window_handle) = 0;

    virtual void end_frame(GLFWwindow* window_handle) = 0;

    virtual void resize(int width, int height) = 0;

    virtual std::shared_ptr<texture> create_texture(const unsigned char* data, int width, int height) = 0;

    virtual std::shared_ptr<render_target> create_render_target(int width, int height, texture_format format) = 0;

    void set_vsync(const bool vsync) { vsync_ = vsync; }

protected:
    std::shared_ptr<shader> default_vs_;
    bool vsync_ = true;
};