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"""
RFC 6578 (Collection Synchronization for WebDAV) XML Elements

This module provides XML element definitions for use with WebDAV
Synchronization.

See RFC 6578: http://www.ietf.org/rfc/rfc6578.txt
"""

__all__ = []


from txdav.xml.base import WebDAVElement, WebDAVTextElement, dav_namespace
from txdav.xml.element import registerElement, registerElementClass
from txdav.xml.rfc2518 import MultiStatus


@registerElement
@registerElementClass
class SyncCollection (WebDAVElement):
    """
    DAV report used to retrieve specific calendar component items via
    their URIs.
    """
    name = "sync-collection"

    # To allow for an empty element in a supported-report-set property we need
    # to relax the child restrictions
    allowed_children = {
        (dav_namespace, "sync-token"): (0, 1),  # When used in the REPORT this is required
        (dav_namespace, "sync-level"): (0, 1),  # When used in the REPORT this is required
        (dav_namespace, "prop"): (0, 1),
    }

    def __init__(self, *children, **attributes):
        super(SyncCollection, self).__init__(*children, **attributes)

        self.property = None
        self.sync_token = None
        self.sync_level = None
        self.sync_limit = None

        for child in self.children:
            qname = child.qname()

            if qname == (dav_namespace, "sync-token"):
                self.sync_token = str(child)

            elif qname == (dav_namespace, "sync-level"):
                self.sync_level = str(child)

            elif qname == (dav_namespace, "limit"):
                if len(child.children) == 1 and child.children[0].qname() == (dav_namespace, "nresults"):
                    try:
                        self.sync_limit = int(str(child.children[0]))
                    except TypeError:
                        pass

            elif qname == (dav_namespace, "prop"):
                if self.property is not None:
                    raise ValueError("Only one of DAV:prop allowed")
                self.property = child


@registerElement
@registerElementClass
class SyncToken (WebDAVTextElement):
    """
    Synchronization token used in report and as a property.
    """
    name = "sync-token"
    hidden = True
    protected = True


@registerElement
@registerElementClass
class SyncLevel (WebDAVTextElement):
    """
    Synchronization level used in report.
    """
    name = "sync-level"


@registerElement
@registerElementClass
class Limit (WebDAVElement):
    """
    Synchronization limit in report.
    """
    name = "limit"

    allowed_children = {
        (dav_namespace, "nresults"): (1, 1),  # When used in the REPORT this is required
    }


@registerElement
@registerElementClass
class NResults (WebDAVTextElement):
    """
    Synchronization numerical limit.
    """
    name = "nresults"


# Extend MultiStatus, to add sync-token
MultiStatus.allowed_children[(dav_namespace, "sync-token")] = (0, 1)