from django.apps import AppConfig
from django.utils.functional import cached_property
from django.utils.translation import gettext_lazy

from . import __version__


class PassbookApp(AppConfig):
    name = "pretix_congressschedule"
    verbose_name = "Congress Schedule"

    class PretixPluginMeta:
        name = gettext_lazy("Congress Schedule")
        author = "Vincent Mahnke"
        description = gettext_lazy("Provides passbook tickets for pretix")
        category = "API"
        visible = True
        featured = True
        version = __version__
        compatibility = "pretix>=4.17.0"

    def ready(self):
        from . import signals  # NOQA

    @cached_property
    def compatibility_errors(self):
        import shutil

        errs = []
        if not shutil.which("openssl"):
            errs.append("The OpenSSL binary is not installed or not in the PATH.")
        return errs

    @cached_property
    def compatibility_warnings(self):
        errs = []
        try:
            from PIL import Image  # NOQA
        except ImportError:
            errs.append(
                "Pillow is not installed on this system, which is required for converting and scaling images."
            )
        return errs