from io import BytesIO
from random import randint
import requests
import urllib.request
import wget
from tkinter import *
from PIL import ImageTk, Image

api_key = "your api key"
username = "your username"
collection_id = #the id number of the collection you want to view

base_url = "https://wallhaven.cc/api/v1/"
opener=urllib.request.build_opener()
opener.addheaders=[('User-Agent','Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1941.0 Safari/537.36')]
urllib.request.install_opener(opener)

def getRandomWall():
    global static_path
    url = "{}collections/{}/{}?apikey={}&page={}".format(base_url, username, collection_id, api_key, 0)
    r = requests.get(url)
    meta = r.json()['meta']
    last_page = meta['last_page']
    per_page = meta['per_page']
    total = meta['total']
    wall = randint(1,total)
    wall_page = 1
    while wall_page * per_page < wall:
        wall_page = wall_page + 1
    wall_page_offset = wall - ((wall_page - 1) * per_page)
    r = requests.get("{}collections/{}/{}?apikey={}&page={}".format(base_url, username, collection_id, api_key, wall_page))
    static_path = r.json()['data'][wall_page_offset - 1]['path']
    return static_path

def saveWallCallback(e):
    wget.download(static_path)

def getWallBytes(path):
    global img_data
    response = requests.get(path)
    img_data = response.content
    bg = ImageTk.PhotoImage(Image.open(BytesIO(img_data)))
    return bg

window=Tk()
window.title('Hello Python')
window.geometry("1280x720")
bg = getWallBytes(getRandomWall())
my_canvas = Canvas(window)
my_canvas.pack(fill="both", expand=True)

class fauxEvent:
    def __init__(self, width, height) -> None:
        self.width = width
        self.height = height
        pass

def changeWallCallback(e):
    getWallBytes(getRandomWall())
    faux_event = fauxEvent(window.winfo_width(),window.winfo_height())
    resizerCallback(faux_event)

def resizerCallback(e):
    global bg1, resized_bg, new_bg
    bg1 = Image.open(BytesIO(img_data))
    ratio = bg1.size[0] / bg1.size[1]
    if e.width / ratio > e.height:
        w = e.height * ratio
        h = e.height
    elif e.height * ratio > e.width:
        w = e.width
        h = e.width / ratio
    else:
        w = e.width
        h = e.height
    w = round(w)
    h = round(h)
    resized_bg = bg1.resize((w, h), Image.ANTIALIAS)
    new_bg = ImageTk.PhotoImage(resized_bg)
    my_canvas.create_image(round(e.width/2),round(e.height/2), image=new_bg) #image centered on screen
    pass

window.bind('<Configure>', resizerCallback)
my_canvas.bind("<Button-1>", changeWallCallback)
my_canvas.bind("<Button-3>", saveWallCallback)
my_canvas.pack()
window.mainloop()