from collections import OrderedDict
import logging

from ..util import create_element, set_xml_value, MNS
from .common import EWSAccountService, EWSPooledMixIn

log = logging.getLogger(__name__)


class CreateItem(EWSAccountService, EWSPooledMixIn):
    """
    Takes folder and a list of items. Returns result of creation as a list of tuples (success[True|False],
    errormessage), in the same order as the input list.

    MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/createitem
    """
    SERVICE_NAME = 'CreateItem'
    element_container_name = '{%s}Items' % MNS

    def call(self, items, folder, message_disposition, send_meeting_invitations):
        from ..folders import BaseFolder, FolderId, DistinguishedFolderId
        from ..items import SAVE_ONLY, SEND_AND_SAVE_COPY, SEND_ONLY, SEND_MEETING_INVITATIONS_CHOICES, \
            MESSAGE_DISPOSITION_CHOICES
        if message_disposition not in MESSAGE_DISPOSITION_CHOICES:
            raise ValueError("'message_disposition' %s must be one of %s" % (
                message_disposition, MESSAGE_DISPOSITION_CHOICES
            ))
        if send_meeting_invitations not in SEND_MEETING_INVITATIONS_CHOICES:
            raise ValueError("'send_meeting_invitations' %s must be one of %s" % (
                send_meeting_invitations, SEND_MEETING_INVITATIONS_CHOICES
            ))
        if folder is not None:
            if not isinstance(folder, (BaseFolder, FolderId, DistinguishedFolderId)):
                raise ValueError("'folder' %r must be a Folder or FolderId instance" % folder)
            if folder.account != self.account:
                raise ValueError('"Folder must belong to this account')
        if message_disposition == SAVE_ONLY and folder is None:
            raise AttributeError("Folder must be supplied when in save-only mode")
        if message_disposition == SEND_AND_SAVE_COPY and folder is None:
            folder = self.account.sent  # 'Sent' is default EWS behaviour
        if message_disposition == SEND_ONLY and folder is not None:
            raise AttributeError("Folder must be None in send-ony mode")
        return self._pool_requests(payload_func=self.get_payload, **dict(
            items=items,
            folder=folder,
            message_disposition=message_disposition,
            send_meeting_invitations=send_meeting_invitations,
        ))

    def get_payload(self, items, folder, message_disposition, send_meeting_invitations):
        """
        Takes a list of Item objects (CalendarItem, Message etc) and returns the XML for a CreateItem request.
        convert items to XML Elements

        MessageDisposition is only applicable to email messages, where it is required.

        SendMeetingInvitations is required for calendar items. It is also applicable to tasks, meeting request
        responses (see
        https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/createitem-operation-meeting-request
        ) and sharing
        invitation accepts (see
        https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/createitem-acceptsharinginvitation
        ). The last two are not supported yet.
        """
        createitem = create_element(
            'm:%s' % self.SERVICE_NAME,
            attrs=OrderedDict([
                ('MessageDisposition', message_disposition),
                ('SendMeetingInvitations', send_meeting_invitations),
            ])
        )
        if folder:
            saveditemfolderid = create_element('m:SavedItemFolderId')
            set_xml_value(saveditemfolderid, folder, version=self.account.version)
            createitem.append(saveditemfolderid)
        item_elems = create_element('m:Items')
        for item in items:
            log.debug('Adding item %s', item)
            set_xml_value(item_elems, item, version=self.account.version)
        if not len(item_elems):
            raise ValueError('"items" must not be empty')
        createitem.append(item_elems)
        return createitem