# copyright 2010-2016 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"""

import errno

import re

import os

import os.path as osp

import tempfile

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 = {}

    def load(self, fpath):

        scriptglobals = self.context.copy()

        scriptglobals['__file__'] = fpath

        with open(fpath, 'rb') as fobj:

            code = compile(fobj.read(), fpath, 'exec')

        exec(code, 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).st_mtime

        self._ordered_propfiles.append(fpath)

    def need_reload(self):

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

            if os.stat(fpath).st_mtime > 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):

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

        self.debug('processing %s/%s into %s',

                   rdirectory, rid, cachefile)

        rcachedir = osp.dirname(cachefile)

        if not osp.exists(rcachedir):

            os.makedirs(rcachedir)

        sourcefile = osp.join(rdirectory, rid)

        with open(sourcefile) as f:

            content = f.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 as ex:

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

            adirectory = rdirectory

        else:

            tmpfd, tmpfile = tempfile.mkstemp(dir=rcachedir, prefix=osp.basename(cachefile))

            with os.fdopen(tmpfd, 'w') as stream:

                stream.write(content)

            try:

                mode = os.stat(sourcefile).st_mode

                os.chmod(tmpfile, mode)

            except IOError:

                self.warning('Cannot set access mode for %s; you may encouter '

                             'file permissions issues', cachefile)

            try:

                os.rename(tmpfile, cachefile)

            except OSError as err:

                if err.errno != errno.EEXIST:

                    raise

                # Under windows, os.rename won't overwrite an existing file

                os.unlink(cachefile)

                os.rename(tmpfile, cachefile)

            adirectory = self._cache_directory

        return adirectory

    def compile(self, content):

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

    # these are overridden by set_log_methods below

    # only defining here to prevent pylint from complaining

    info = warning = error = critical = exception = debug = lambda msg,*a,**kw: None

from cubicweb.web import LOGGER

from logilab.common.logging_ext import set_log_methods

set_log_methods(PropertySheet, LOGGER)