"""|SettingsPart| and closely related objects."""

import os

from docx.opc.constants import CONTENT_TYPE as CT
from docx.opc.packuri import PackURI
from docx.opc.part import XmlPart
from docx.oxml.parser import parse_xml
from docx.settings import Settings


class SettingsPart(XmlPart):
    """Document-level settings part of a WordprocessingML (WML) package."""

    @classmethod
    def default(cls, package):
        """Return a newly created settings part, containing a default `w:settings`
        element tree."""
        partname = PackURI("/word/settings.xml")
        content_type = CT.WML_SETTINGS
        element = parse_xml(cls._default_settings_xml())
        return cls(partname, content_type, element, package)

    @property
    def settings(self):
        """A |Settings| proxy object for the `w:settings` element in this part,
        containing the document-level settings for this document."""
        return Settings(self.element)

    @classmethod
    def _default_settings_xml(cls):
        """Return a bytestream containing XML for a default settings part."""
        path = os.path.join(
            os.path.split(__file__)[0], "..", "templates", "default-settings.xml"
        )
        with open(path, "rb") as f:
            xml_bytes = f.read()
        return xml_bytes