#include "../../include/glad/glad.h"
#include "../../include/imgui/imgui.h"
#include "../../include/imgui/impl/imgui_impl_opengl3.h"
#include "../../include/imgui/impl/imgui_impl_glfw.h"
#include <GLFW/glfw3.h>
#include <iostream>

void fbuffer(GLFWwindow *window, int width, int height);
void processInput(GLFWwindow *window);

int main(int argc, char const *argv[])
{
    glfwInit();
    GLFWwindow *window = glfwCreateWindow(800, 600, "LearnOpenGL", NULL, NULL);
    glfwMakeContextCurrent(window);
    glfwSetFramebufferSizeCallback(window, fbuffer);

    bool err = gladLoadGL() == 0;

    IMGUI_CHECKVERSION();
    ImGui::CreateContext();
    ImGuiIO &io = ImGui::GetIO();
    (void)io;
    io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
    ImGui::StyleColorsDark();

    const char *glsl_version = "#version 130";
    ImGui_ImplGlfw_InitForOpenGL(window, true);
    ImGui_ImplOpenGL3_Init(glsl_version);

    bool showDemo = true;
    ImVec4 bg = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);

    while (!glfwWindowShouldClose(window))
    {
        processInput(window);
        glfwPollEvents();

        //Start ImGui
        ImGui_ImplOpenGL3_NewFrame();
        ImGui_ImplGlfw_NewFrame();
        ImGui::NewFrame();
        if (showDemo)
        {
            ImGui::ShowDemoWindow(&showDemo);
        }

        //Render
        ImGui::Render();
        glClearColor(bg.x, bg.y, bg.z, bg.w);
        glClear(GL_COLOR_BUFFER_BIT);
        ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
        glfwSwapBuffers(window);
    }
    ImGui_ImplOpenGL3_Shutdown();
    ImGui_ImplGlfw_Shutdown();
    ImGui::DestroyContext();
    glfwTerminate();
    return 0;
}

void fbuffer(GLFWwindow *window, int width, int height)
{
    glViewport(0, 0, width, height);
}

void processInput(GLFWwindow *window)
{
    if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
        glfwSetWindowShouldClose(window, true);
}