#include <GL/glew.h>
#include <GLFW/glfw3.h>

#include <imgui.h>
#include <imgui_impl_glfw.h>
#include <imgui_impl_opengl3.h>

#include <iostream>
#include <fstream>
#include <sstream>
#include <string>

#include "scene.h"

void Scene::DrawGUI(GLFWwindow* window) {
    // Begin ImGui frame
    ImGui_ImplOpenGL3_NewFrame();
    ImGui_ImplGlfw_NewFrame();

    // Enable docking
    ImGuiIO& io = ImGui::GetIO();
    io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;

    ImGui::NewFrame();

    static ImGuiDockNodeFlags dockspace_flags = ImGuiDockNodeFlags_PassthruCentralNode;

    // Add menu bar
    ImGuiWindowFlags window_flags = ImGuiWindowFlags_MenuBar | ImGuiWindowFlags_NoDocking;

    // Style windows
    const ImGuiViewport* viewport = ImGui::GetMainViewport();
    ImGui::SetNextWindowPos(viewport->WorkPos);
    ImGui::SetNextWindowSize(viewport->WorkSize);
    ImGui::SetNextWindowViewport(viewport->ID);
    ImGui::PushStyleVar(ImGuiStyleVar_WindowRounding, 0.0f);
    ImGui::PushStyleVar(ImGuiStyleVar_WindowBorderSize, 0.0f);
    window_flags |= ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove;
    window_flags |= ImGuiWindowFlags_NoBringToFrontOnFocus | ImGuiWindowFlags_NoNavFocus;
    window_flags |= ImGuiWindowFlags_NoBackground;

    ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(0.0f, 0.0f));
    ImGui::Begin("TerraVisor", nullptr, window_flags);
    ImGui::PopStyleVar(3);

    // Submit the DockSpace
    if (io.ConfigFlags & ImGuiConfigFlags_DockingEnable)
    {
        ImGuiID dockspace_id = ImGui::GetID("MyDockSpace");
        ImGui::DockSpace(dockspace_id, ImVec2(0.0f, 0.0f), dockspace_flags);
    }

    if (ImGui::BeginMenuBar())
    {
        if (ImGui::BeginMenu("Options"))
        {
            ImGui::Text("Nothing Here Yet, Check Back Later!");

            ImGui::EndMenu();
        }

        ImGui::EndMenuBar();
    }

    ImGui::End();

    //Draw Gui
    ImGui::Begin("Terrain Controls");
    if (ImGui::Button("Quit"))
    {
        glfwSetWindowShouldClose(window, GLFW_TRUE);
    }

    ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
    ImGui::End();

    ImGui::Render();
    ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
}

void Scene::Display(GLFWwindow* window) {
    glClear(GL_COLOR_BUFFER_BIT);

    Scene::DrawGUI(window);

    glfwSwapBuffers(window);
}

void Scene::Idle() {
}

void Scene::Init() {
    glewInit();

    glEnable(GL_DEPTH_TEST);
    glEnable(GL_CULL_FACE);
}