import random
from pathlib import Path

from PIL import Image

from django.core.files.base import ContentFile

from misago.conf import settings

from . import store


DEFAULT_GALLERY = '__default__'


def get_available_galleries(include_default=False):
    """
    Returns list of dicts containing 'name' and list of images

    Only jpgs, gifs and pngs are supported avatar images.
    Galleries are
    """
    from misago.users.models import AvatarGallery

    galleries = []
    galleries_dicts = {}

    for image in AvatarGallery.objects.all():
        if image.gallery == DEFAULT_GALLERY and not include_default:
            continue

        if image.gallery not in galleries_dicts:
            galleries_dicts[image.gallery] = {'name': image.gallery, 'images': []}

            galleries.append(galleries_dicts[image.gallery])

        galleries_dicts[image.gallery]['images'].append(image)

    return galleries


def galleries_exist():
    from misago.users.models import AvatarGallery
    return AvatarGallery.objects.exists()


def load_avatar_galleries():
    from misago.users.models import AvatarGallery

    galleries = []
    for directory in Path(settings.MISAGO_AVATAR_GALLERY).iterdir():
        if not directory.is_dir():
            continue

        name = directory.name
        images = glob_gallery_images(directory)

        for image in images:
            with open(image, 'rb') as image_file:
                galleries.append(
                    AvatarGallery.objects.
                    create(gallery=name, image=ContentFile(image_file.read(), 'image'))
                )
    return galleries


def glob_gallery_images(directory):
    images = []
    images.extend(directory.glob('*.gif'))
    images.extend(directory.glob('*.jpg'))
    images.extend(directory.glob('*.jpeg'))
    images.extend(directory.glob('*.png'))
    return images


def set_avatar(user, avatar):
    store.store_new_avatar(user, Image.open(avatar.image))


def set_random_avatar(user):
    galleries = get_available_galleries(include_default=True)
    if not galleries:
        raise RuntimeError("no avatar galleries are set")

    avatars_list = []
    for gallery in galleries:
        if gallery['name'] == DEFAULT_GALLERY:
            avatars_list = gallery['images']
            break
        else:
            avatars_list += gallery['images']

    random_avatar = random.choice(avatars_list)
    store.store_new_avatar(user, Image.open(random_avatar.image))