import hashlib
from PIL import Image
from kivy.core.image import Image as CoreImage
# Core classes for loading images and converting them to a Texture. The raw image data can be keep in memory for further access
from kivy.uix.image import Image as kiImage
from io import BytesIO

# constants
RESOLUTION = 128, 128
V_RESOLUTION = 7, 7
BACKGROUND_COLOR = 255, 255, 255, 255
MODE = "RGB"


def generate(Generate_string=None):
    hash_string = generate_hash(Generate_string)
    color = random_color(hash_string)
    image = Image.new(MODE, V_RESOLUTION, BACKGROUND_COLOR)
    image = generate_image(image, color, hash_string)
    image = image.resize(RESOLUTION, 0)

    data = BytesIO()
    image.save(data, format='png')
    data.seek(0)
    # yes you actually need this
    im = CoreImage(BytesIO(data.read()), ext='png')
    beeld = kiImage()
    # only use this line in first code instance
    beeld.texture = im.texture
    return beeld
    # image.show()


def generate_hash(string):
    try:
        # make input case insensitive
        string = str.lower(string)
        hash_object = hashlib.md5(str.encode(string))
        print(hash_object.hexdigest())

        # returned object is a hex string
        return hash_object.hexdigest()

    except IndexError:
        print("Error: Please enter a string as an argument.")


def random_color(hash_string):
    # remove first three digits from hex string
    split = 6
    rgb = hash_string[:split]

    split = 2
    r = rgb[:split]
    g = rgb[split:2 * split]
    b = rgb[2 * split:3 * split]

    color = (int(r, 16), int(g, 16),
             int(b, 16), 0xFF)

    return color


def generate_image(image, color, hash_string):
    hash_string = hash_string[6:]

    lower_x = 1
    lower_y = 1
    upper_x = int(V_RESOLUTION[0] / 2) + 1
    upper_y = V_RESOLUTION[1] - 1
    limit_x = V_RESOLUTION[0] - 1
    index = 0

    for x in range(lower_x, upper_x):
        for y in range(lower_y, upper_y):
            if int(hash_string[index], 16) % 2 == 0:
                image.putpixel((x, y), color)
                image.putpixel((limit_x - x, y), color)

            index = index + 1

    return image