import structlog
import tempfile

from dateutil.parser import ParserError, parse
from django.utils.text import slugify


logger = structlog.get_logger()


def decode_content(content):
    """Decode bytes to string."""
    if isinstance(content, bytes):
        return content.decode("utf-8")
    return content


def generate_fake_email(val: str) -> str:
    """Slugify a string to make a fake email.

    Would not necessarily be unique -- this is a lazy way for us to avoid creating
    multiple new user records for one contributor who contributes to multiple libraries.
    """
    slug = slugify(val)
    local_email = slug.replace("-", "_")[:50]
    return f"{local_email}@example.com"


def parse_date(date_str):
    """Parses a date string to a datetime. Does not return an error."""
    try:
        return parse(date_str)
    except ParserError:
        logger.info("parse_date_invalid_date", date_str=date_str)
        return None


def write_content_to_tempfile(content):
    """Accepts string or bytes content, writes it to a temporary file, and returns the
    file object."""
    with tempfile.NamedTemporaryFile(delete=False) as temp_file:
        if isinstance(content, bytes):
            temp_file = open(temp_file.name, "wb")
        temp_file.write(content)
        temp_file.close()
    return temp_file