# -*- test-case-name: twext.web2.dav.test.test_delete -*-
##
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##

"""
WebDAV DELETE method
"""

__all__ = ["deleteResource"]

from twisted.internet.defer import waitForDeferred, deferredGenerator

from twext.python.log import Logger
from twext.web2 import responsecode
from twext.web2.http import HTTPError
from twext.web2.dav.fileop import delete

log = Logger()


def deleteResource(request, resource, resource_uri, depth="0"):
    """
    Handle a resource delete with proper quota etc updates
    """
    if not resource.exists():
        log.error("File not found: %s" % (resource,))
        raise HTTPError(responsecode.NOT_FOUND)

    # Do quota checks before we start deleting things
    myquota = waitForDeferred(resource.quota(request))
    yield myquota
    myquota = myquota.getResult()
    if myquota is not None:
        old_size = waitForDeferred(resource.quotaSize(request))
        yield old_size
        old_size = old_size.getResult()
    else:
        old_size = 0

    # Do delete
    x = waitForDeferred(delete(resource_uri, resource.fp, depth))
    yield x
    result = x.getResult()

    # Adjust quota
    if myquota is not None:
        d = waitForDeferred(resource.quotaSizeAdjust(request, -old_size))
        yield d
        d.getResult()
    
    yield result

deleteResource = deferredGenerator(deleteResource)
