# -*- coding: utf-8 -*-
# Python3
"""Creates resized copies of the user's selected app icon to all sizes that iOS 8 requires
and renames those copies to the names iOS 8 requires."""

import os
import sys
import shutil
from typing import List, Tuple
from tkinter import Tk
from tkinter.filedialog import askopenfilename
from PIL import Image

# iOS 8 required and recommended app icon sizes
icon_sizes = [29, 58, 87, 40, 80, 60, 120, 180, 76, 152, 512, 1024]

# Corresponding names
icon_names = ["Icon-Small.png",
              "Icon-Small@2x.png",
              "Icon-Small@3x.png",
              "Icon-Small-40.png",
              "Icon-Small-40@2x.png",
              "Icon-60.png",
              "Icon-60@2x.png",
              "Icon-60@3x.png",
              "Icon-76.png",
              "Icon-76@2x.png",
              "iTunesArtwork.png",
              "iTunesArtwork@2x.png",
              ]

# folder name in which copies are stored
destination = "output"


def open_img():
    """Opens file dialog and returns image selected"""
    Tk().withdraw()
    filename = askopenfilename()
    try:
        return Image.open(filename)
    except Exception as e:
        print("No file opened: {}".format(e))
        sys.exit(1)


def resize(img, size: int):
    """Resizes given square image to given side dimension"""
    return img.resize((size, size), Image.ANTIALIAS)


def save_imgs(names_and_images: List[Tuple[str, type]]):
  """Saves all created images to destination folder"""
    for name, img in names_and_images:
        img.save(os.path.join(destination, name))


if __name__ == "__main__":
    original = open_img()

    names_and_sizes = list(zip(icon_names, icon_sizes))
    names_and_images = [(name, resize(original, size))
                        for name, size in names_and_sizes]

    if os.path.exists(destination):
        shutil.rmtree(destination, ignore_errors=True)
    os.mkdir(destination)

    save_imgs(names_and_images)