#include <glad/glad.h> /*Must be before GLFW*/
#include <GLFW/glfw3.h>
#include <cassert>
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
#include <shader.hpp>
#include <texture.hpp>
#include <shapes.h>


#define UNUSED(x) (void)(x)

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

glm::vec3 cubePositions[] = {
    glm::vec3(0.0f, 0.0f, 0.0f),    glm::vec3(2.0f, 5.0f, -15.0f),
    glm::vec3(-1.5f, -2.2f, -2.5f), glm::vec3(-3.8f, -2.0f, -12.3f),
    glm::vec3(2.4f, -0.4f, -3.5f),  glm::vec3(-1.7f, 3.0f, -7.5f),
    glm::vec3(1.3f, -2.0f, -2.5f),  glm::vec3(1.5f, 2.0f, -2.5f),
    glm::vec3(1.5f, 0.2f, -1.5f),   glm::vec3(-1.3f, 1.0f, -1.5f)};

int main(void) {
  glfwInit();
  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
  glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

  GLFWwindow *window = glfwCreateWindow(800, 600, "LearnOpenGL", NULL, NULL);
  assert(window && "Window Failed");
  glfwMakeContextCurrent(window);

  int is_ok = 0;
  is_ok = gladLoadGLLoader((GLADloadproc)glfwGetProcAddress);
  assert(is_ok && "Failed to init glad");

  glViewport(0, 0, 800, 600);
  glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);

  unsigned int VBO, VAO;
  glGenVertexArrays(1, &VAO);
  glBindVertexArray(VAO);

  glGenBuffers(1, &VBO);
  glBindBuffer(GL_ARRAY_BUFFER, VBO);
  glBufferData(GL_ARRAY_BUFFER, sizeof(cube_vertices), cube_vertices,
               GL_STATIC_DRAW);

  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void *)0);
  glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void *)0);
  glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float),
                        (void *)(3 * sizeof(float)));

  glEnableVertexAttribArray(0); /*pos*/
  glEnableVertexAttribArray(1); /*rgb*/
  glEnableVertexAttribArray(2); /*tex_cord*/

  Shader *shaderProgram =
      new Shader("./shaders/MVPTexVert.glsl", "./shaders/TexFrag.glsl");
  Texture *texture =
    new Texture(GL_TEXTURE_2D,"./texture/container.jpg");

  while (!glfwWindowShouldClose(window)) {
    glm::mat4 projection = glm::perspective(glm::radians(45.0f), 800.0f / 600.0f,
                                          0.1f, 100.0f); /*camera settings*/
    glm::mat4 view = glm::mat4(1.0f); /*move camera*/
    const float radius = 10.0f;
    float camX = sin(glfwGetTime()) * radius;
    float camZ = cos(glfwGetTime()) * radius;
    view = glm::lookAt(glm::vec3(camX, 0.0, camZ), glm::vec3(0.0, 0.0, 0.0),
                       glm::vec3(0.0, 1.0, 0.0));


    glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    shaderProgram->use();
    shaderProgram->setInt("Tex0", 0);
    shaderProgram->setMat4("view", view);
    shaderProgram->setMat4("projection", projection);
    texture->bind(GL_TEXTURE0);

    glBindVertexArray(VAO);
    glEnable(GL_DEPTH_TEST);

    for (unsigned int i = 0; i < 10; i++) {
      glm::mat4 model = glm::mat4(1.0f);
      model = glm::translate(model, cubePositions[i]);

      float angle = 20.0f * i;
      model =
          glm::rotate(model, glm::radians(angle), glm::vec3(1.0f, 0.3f, 0.5f));
      model = glm::rotate(model, (float)glfwGetTime() * glm::radians(55.0f),
                          glm::vec3(1.0f, 0.5f, 0.0f));

      shaderProgram->setMat4("model", model);
      glDrawArrays(GL_TRIANGLES, 0, 36);
    }

    glfwSwapBuffers(window);
    glfwPollEvents();
    processInput(window);
  }

  delete (shaderProgram);
  glfwTerminate();
  return 0;
}

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

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