import numpy as np
import cv2
import matplotlib.pyplot as plt
import torch
import torchvision

mean_nums = [0.485, 0.456, 0.406]
std_nums = [0.229, 0.224, 0.225]


def load_image(img_path, resize=True):
  img = cv2.cvtColor(cv2.imread(img_path), cv2.COLOR_BGR2RGB)

  if resize:
    img = cv2.resize(img, (64, 64), interpolation = cv2.INTER_AREA)

  return img

def show_image(img_path):
  img = load_image(img_path)
  plt.imshow(img)
  plt.axis('off')

def show_grid_image(image_paths):
  images = [load_image(img) for img in image_paths]
  images = torch.as_tensor(images)
  images = images.permute(0, 3, 1, 2)
  grid_img = torchvision.utils.make_grid(images, nrow=11)
  plt.figure(figsize=(24, 12))
  plt.imshow(grid_img.permute(1, 2, 0))
  plt.axis('off');

def image_show(inp, title=None):
  inp = inp.numpy().transpose((1, 2, 0))
  mean = np.array([mean_nums])
  std = np.array([std_nums])
  inp = std * inp + mean
  inp = np.clip(inp, 0, 1)
  plt.imshow(inp)
  if title is not None:
    plt.title(title)
  plt.axis('off')