#
#  Copyright (c) 2006 Helmut Merz helmutm@cy55.de
#
#  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; either version 2 of the License, or
#  (at your option) any later version.
#
#  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

"""
Utility functions.

$Id$
"""

import os
from zope import component
from zope.app.intid.interfaces import IIntIds
from zope.interface import directlyProvides, directlyProvidedBy
from zope.i18nmessageid import MessageFactory
from zope.schema import vocabulary

import cybertools
from loops.browser.util import html_quote

_ = MessageFactory('loops')
#_ = MessageFactory('zope')  # it's easier not use a special i18n domain?


renderingFactories = {
    'text/plain': 'zope.source.plaintext',
    'text/stx': 'zope.source.stx',
    'text/structured': 'zope.source.stx',
    'text/rest': 'zope.source.rest',
    'text/restructured': 'zope.source.rest',
}


class KeywordVocabulary(vocabulary.SimpleVocabulary):

    def __init__(self, items, *interfaces):
        """ ``items`` may be a tuple of (token, title) or a dictionary
            with corresponding elements named 'token' and 'title'.
        """
        terms = []
        for t in items:
            if type(t) is dict:
                token, title = t['token'], t['title']
            else:
                token, title = t
            terms.append(vocabulary.SimpleTerm(token, token, title))
        super(KeywordVocabulary, self).__init__(terms, *interfaces)


def removeTargetRelation(context, event):
    """ Handles IRelationInvalidatedEvent by doing some cleanup work.
    """
    targetIfc = context.second.proxyInterface
    if targetIfc:
        directlyProvides(context.first, directlyProvidedBy(context) - targetIfc)


def nl2br(text):
    if not text: return text
    if '\n' in text: # Unix or DOS line endings
        return '<br />\n'.join(x.replace('\r', '') for x in text.split('\n'))
    else: # gracefully handle Mac line endings
        return '<br />\n'.join(text.split('\r'))

def toUnicode(value, encoding='UTF-8'):
    if type(value) is not unicode:
        return value.decode(encoding)
    else:
        return value


def getObjectForUid(uid, intIds=None):
    if uid == '*': # wild card
        return '*'
    if intIds is None:
        intIds = component.getUtility(IIntIds)
    return intIds.getObject(int(uid))

def getUidForObject(obj):
    if obj == '*': # wild card
        return '*'
    intIds = component.getUtility(IIntIds)
    return str(intIds.queryId(obj))


def getVarDirectory(request=None):
    varDir = None
    if request is not None:
        pub = request.publication
        if pub is not None:
            varDir = os.path.dirname(pub.db.getName())
    if varDir is None:
        instanceHome = os.path.dirname(os.path.dirname(os.path.dirname(
                                os.path.dirname(cybertools.__file__))))
        varDir = os.path.join(instanceHome, 'var')
    return varDir