// clang-format off
#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <iostream>
#include "shader.h"
// clang-format on

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

int main() {
  std::cout << "Hello, World!" << std::endl;

  glfwInit();
  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
  glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
  glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);

  GLFWwindow* window = glfwCreateWindow(800, 600, "Voronoi", nullptr, nullptr);
  if (window == nullptr) {
    std::cout << "Failed to create GLFW window" << std::endl;
    glfwTerminate();
    return -1;
  }
  glfwMakeContextCurrent(window);

  if (gladLoadGLLoader((GLADloadproc)glfwGetProcAddress) == 0) {
    std::cout << "Failed to initialize GLAD" << std::endl;
    return -1;
  }

  glViewport(0, 0, 800, 600);

  glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);

  // Add shaders
  Shader shader("/home/olivier/CodeProject/Voronoi_2/src/shaders/shader.vert", "/home/olivier/CodeProject/Voronoi_2/src/shaders/shader.frag");


  float vertices[] = {
      0.5f,  0.5f,  0.0f,  // top right
      0.5f,  -0.5f, 0.0f,  // bottom right
      -0.5f, -0.5f, 0.0f,  // bottom left
      -0.5f, 0.5f,  0.0f   // top left
  };
  unsigned int indices[] = {
      // note that we start from 0!
      0, 1, 3,  // first triangle
      1, 2, 3   // second triangle
  };
  unsigned int VBO, VAO, EBO;

  // Generate buffers
  glGenVertexArrays(1, &VAO);
  glGenBuffers(1, &VBO);
  glGenBuffers(1, &EBO);


  // Bind buffers
  glBindBuffer(GL_ARRAY_BUFFER, VBO);
  glBindVertexArray(VAO);
  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);

  // Copy data to buffers
  glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
  glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices,
               GL_STATIC_DRAW);

  // Set vertex attributes
  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float),
                        (void*)nullptr);
  glEnableVertexAttribArray(0);

  glBindBuffer(GL_ARRAY_BUFFER, 0);
  glBindVertexArray(0);

  // Copy data to buffers

  // Draw loop
  while (!glfwWindowShouldClose(window)) {
    glfwPollEvents();
    glClearColor(0.2f, 0.3f, 1.0f, 1.0f);
    glClear(GL_COLOR_BUFFER_BIT);

    shader.use();
    glBindVertexArray(VAO);
    glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
    glDrawElements(GL_LINES, 6, GL_UNSIGNED_INT, nullptr);

    glfwSwapBuffers(window);
  }

  glfwTerminate();

  return 0;
}

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