// Must be the first include
#include <glad/glad.h>

// Other includes
#include <GLFW/glfw3.h>
#include <iostream>

#include "BumpMapDemo.h"
#include "Framebuffer3D.h"
#include "Input.h"
#include "MCRenderer.h"
#include "Shader.h"

void framebuffer_size_callback(GLFWwindow *window, int width, int height);

static void key_callback(GLFWwindow *window, int key, int scancode, int action, int mods) {
    if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS) glfwSetWindowShouldClose(window, GLFW_TRUE);

    Input::set_key_down(key, action == GLFW_RELEASE ? false : true);
}

// settings
const unsigned int SCR_WIDTH = 1920;
const unsigned int SCR_HEIGHT = 1080;

int main() {
    // glfw: initialize and configure
    // ------------------------------
    glfwInit();
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

#ifdef __APPLE__
    glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
#endif

    // glfw window creation
    // --------------------
    GLFWwindow *window = glfwCreateWindow(SCR_WIDTH, SCR_HEIGHT, "Marching Cubes", NULL, NULL);
    if (window == NULL) {
        std::cout << "Failed to create GLFW window" << std::endl;
        glfwTerminate();
        return -1;
    }
    glfwMakeContextCurrent(window);

    // glad: load all OpenGL function pointers
    // ---------------------------------------
    if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
        std::cout << "Failed to initialize GLAD" << std::endl;
        return -1;
    }

    // Keyboard input processing function
    glfwSetKeyCallback(window, key_callback);

    // configure global opengl state
    // -----------------------------
    glEnable(GL_DEPTH_TEST);

    // Setup the Marching Cubes renderer
    BumpMapDemo renderer;

    // render loop
    double timeInLastFrame = glfwGetTime();
    double elapsed_time = 0.0;

    while (!glfwWindowShouldClose(window)) {
        // Delta time handling
        double delta = glfwGetTime() - timeInLastFrame;
        timeInLastFrame = glfwGetTime();
        elapsed_time += delta;

        renderer.render(delta);

        // glfw: swap buffers and poll IO events (keys pressed/released, mouse moved etc.)
        glfwSwapBuffers(window);
        glfwPollEvents();
    }

    return 0;
}

// glfw: whenever the window size changed (by OS or user resize) this callback function executes
// ---------------------------------------------------------------------------------------------
void framebuffer_size_callback(GLFWwindow *window, int width, int height) {
    // make sure the viewport matches the new window dimensions; note that width and
    // height will be significantly larger than specified on retina displays.
    glViewport(0, 0, width, height);
}