# Xandikos
# Copyright (C) 2017 Jelmer Vernooij <jelmer@jelmer.uk>, et al.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; version 3
# of the License or (at your option) any later version of
# the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA  02110-1301, USA.

"""VCard file handling."""

from .store import File, InvalidFileContents


class VCardFile(File):

    content_type = "text/vcard"

    def __init__(self, content, content_type) -> None:
        super().__init__(content, content_type)
        self._addressbook = None

    def validate(self):
        c = b"".join(self.content).strip()
        # TODO(jelmer): Do more extensive checking of VCards
        if (not c.startswith((b"BEGIN:VCARD\r\n", b"BEGIN:VCARD\n"))
                or not c.endswith(b"\nEND:VCARD")):
            raise InvalidFileContents(
                self.content_type,
                self.content,
                "Missing header and trailer lines",
            )
        if not self.addressbook.validate():
            # TODO(jelmer): Get data about what is invalid
            raise InvalidFileContents(
                self.content_type,
                self.content,
                "Invalid VCard file")

    @property
    def addressbook(self):
        if self._addressbook is None:
            import vobject
            text = b"".join(self.content).decode('utf-8', 'surrogateescape')
            try:
                self._addressbook = vobject.readOne(text)
            except vobject.base.ParseError as exc:
                raise InvalidFileContents(
                    self.content_type, self.content, str(exc)) from exc
        return self._addressbook