#!/usr/bin/python3
# shows with PyGame the NASA Image of the Day
import os, pygame, pygame.locals, re, requests

# dowload website text from earth observatory server
u1 = "https://earthobservatory.nasa.gov/"
u2 = "topic/image-of-the-day"
try:
    rsp = requests.get(u1+u2)
    txt = rsp.text
except requests.exceptions.RequestException as e:
    raise SystemExit(e)

# save URL of image file and the image caption text
rs = r'<img src = "([^"]+)" alt = "([^"]+)"'
mao = re.compile(rs).search(txt)
if mao:
    img = mao.group(1)
    alt = mao.group(2)
else: print("ERROR: image file not found!")

# dowload image and save it in a temporary file
try:
    rsp = requests.get(img)
except requests.exceptions.RequestException as e:
    raise SystemExit(e)
with open("nasa.tmp", "wb") as f:
    f.write(rsp.content)

# display image from temporary file using PyGame
os.system("clear")
pygame.display.init()
pygame.mouse.set_visible(False)
b = pygame.image.load("nasa.tmp")
s = pygame.display.set_mode()
s.blit(b, (0,0))

# display caption alt of the image using PyGame
pygame.font.init()
font = pygame.font.SysFont("notosansmono",25)
bild = font.render(alt, True, pygame.Color("gold"))
s.blit(bild,(8,0))

# display image and caption, delete temporary file
pygame.display.flip()
os.remove("nasa.tmp")

# wait until any key is pressed and finish PyGame
waiting = True
while waiting:
    for event in pygame.event.get():
        if event.type == pygame.locals.QUIT or\
        event.type == pygame.locals.KEYDOWN:
            waiting = False
pygame.quit()