import os
from datetime import datetime

from django.utils import timezone
from django.utils.text import slugify


def common_user_str(user):
    if not user:
        return ""
    return user.full_name if user.full_name else user.mobile


def common_datetime_str(datetime):
    if not datetime:
        return ""
    try:
        if timezone.is_aware(datetime):
            datetime = timezone.localtime(datetime)
        else:
            datetime = timezone.make_aware(datetime, timezone.get_current_timezone())
    except Exception:
        pass
    return datetime.strftime("%Y.%m.%d %H:%M")


def common_date_str(datetime):
    if not datetime:
        return ""
    try:
        if timezone.is_aware(datetime):
            datetime = timezone.localtime(datetime)
        else:
            datetime = timezone.make_aware(datetime, timezone.get_current_timezone())
    except Exception:
        pass
    return datetime.strftime("%Y.%m.%d")


def file_name_datetime_str():
    dt = timezone.now()
    return f"{dt.year}-{dt.month}-{dt.day}-{dt.hour}-{dt.minute}-{dt.second}"


def upload_to_by_date(instance, filename):
    today = datetime.now()
    timestamp = today.strftime("%Y%m%d%H%M%S")
    file_extension = os.path.splitext(filename)[1]
    new_filename = f"{timestamp}{file_extension}"
    return os.path.join(f"storage/{today.year}/", new_filename)


def calculate_age(birth_date):
    """
    Helper Function  to calculate age from birth date
    """
    if not birth_date:
        return None

    today = timezone.localdate()
    age = today.year - birth_date.year - int((today.month, today.day) < (birth_date.month, birth_date.day))
    return age


def generate_slug(title, Object, pk):
    base_slug = slugify(title, allow_unicode=True)
    slug = base_slug
    counter = 2
    while slug and Object.objects.filter(slug=slug).exclude(pk=pk).exists():
        slug = f"{base_slug}-{counter}"
        counter += 1
    return slug