# copyright 2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr

#

# This file is part of CubicWeb.

#

# CubicWeb is free software: you can redistribute it and/or modify it under the

# terms of the GNU Lesser General Public License as published by the Free

# Software Foundation, either version 2.1 of the License, or (at your option)

# any later version.

#

# CubicWeb 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 Lesser General Public License for more

# details.

#

# You should have received a copy of the GNU Lesser General Public License along

# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.

"""property sheets allowing configuration of the web ui"""

__docformat__ = "restructuredtext en"

import re

import os

import os.path as osp

TYPE_CHECKS = [('STYLESHEETS', list), ('JAVASCRIPTS', list),

               ('STYLESHEETS_IE', list), ('STYLESHEETS_PRINT', list),

               ]

class lazystr(object):

    def __init__(self, string, context):

        self.string = string

        self.context = context

    def __str__(self):

        return self.string % self.context

class PropertySheet(dict):

    def __init__(self, cache_directory, **context):

        self._cache_directory = cache_directory

        self.context = context

        self.reset()

        context['sheet'] = self

        context['lazystr'] = self.lazystr

        self._percent_rgx = re.compile('%(?!\()')

    def lazystr(self, str):

        return lazystr(str, self)

    def reset(self):

        self.clear()

        self._ordered_propfiles = []

        self._propfile_mtime = {}

        self._sourcefile_mtime = {}

        self._cache = {}

    def load(self, fpath):

        scriptglobals = self.context.copy()

        scriptglobals['__file__'] = fpath

        execfile(fpath, scriptglobals, self)

        for name, type in TYPE_CHECKS:

            if name in self:

                if not isinstance(self[name], type):

                    msg = "Configuration error: %s.%s should be a %s" % (fpath, name, type)

                    raise Exception(msg)

        self._propfile_mtime[fpath] = os.stat(fpath)[-2]

        self._ordered_propfiles.append(fpath)

    def need_reload(self):

        for rid, (adirectory, rdirectory, mtime) in self._cache.items():

            if os.stat(osp.join(rdirectory, rid))[-2] > mtime:

                del self._cache[rid]

        for fpath, mtime in self._propfile_mtime.iteritems():

            if os.stat(fpath)[-2] > mtime:

                return True

        return False

    def reload(self):

        ordered_files = self._ordered_propfiles

        self.reset()

        for fpath in ordered_files:

            self.load(fpath)

    def reload_if_needed(self):

        if self.need_reload():

            self.reload()

    def process_resource(self, rdirectory, rid):

        try:

            return self._cache[rid][0]

        except KeyError:

            cachefile = osp.join(self._cache_directory, rid)

            self.debug('caching processed %s/%s into %s',

                       rdirectory, rid, cachefile)

            rcachedir = osp.dirname(cachefile)

            if not osp.exists(rcachedir):

                os.makedirs(rcachedir)

            sourcefile = osp.join(rdirectory, rid)

            content = file(sourcefile).read()

            # XXX replace % not followed by a paren by %% to avoid having to do

            # this in the source css file ?

            try:

                content = self.compile(content)

            except ValueError, ex:

                self.error("can't process %s/%s: %s", rdirectory, rid, ex)

                adirectory = rdirectory

            else:

                stream = file(cachefile, 'w')

                stream.write(content)

                stream.close()

                adirectory = self._cache_directory

            self._cache[rid] = (adirectory, rdirectory, os.stat(sourcefile)[-2])

            return adirectory

    def compile(self, content):

        return self._percent_rgx.sub('%%', content) % self

from cubicweb.web import LOGGER

from logilab.common.logging_ext import set_log_methods

set_log_methods(PropertySheet, LOGGER)