# -*- coding: utf-8 -*-

"""

    rhodecode.model.gist

    ~~~~~~~~~~~~~~~~~~~~

    gist model for RhodeCode

    :created_on: May 9, 2013

    :author: marcink

    :copyright: (C) 2011-2013 Marcin Kuzminski <marcin@python-works.com>

    :license: GPLv3, see COPYING for more details.

"""

# 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 3 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, see <http://www.gnu.org/licenses/>.

import os

import time

import logging

import traceback

import shutil

from pylons.i18n.translation import _

from rhodecode.lib.utils2 import safe_unicode, unique_id, safe_int, \

    time_to_datetime, safe_str, AttributeDict

from rhodecode.lib import helpers as h

from rhodecode.model import BaseModel

from rhodecode.model.db import Gist

from rhodecode.model.repo import RepoModel

from rhodecode.model.scm import ScmModel

from rhodecode.lib.vcs import get_repo

log = logging.getLogger(__name__)

class GistModel(BaseModel):

    def _get_gist(self, gist):

        """

        Helper method to get gist by ID, or gist_access_id as a fallback

        :param gist: GistID, gist_access_id, or Gist instance

        """

        return self._get_instance(Gist, gist,

                                  callback=Gist.get_by_access_id)

    def __delete_gist(self, gist):

        """

        removes gist from filesystem

        :param gist: gist object

        """

        root_path = RepoModel().repos_path

        rm_path = os.path.join(root_path, GIST_STORE_LOC, gist.gist_access_id)

        log.info("Removing %s" % (rm_path))

        shutil.rmtree(rm_path)

    def get_gist_files(self, gist_access_id):

        """

        Get files for given gist

        :param gist_access_id:

        """

        root_path = RepoModel().repos_path

        r = get_repo(os.path.join(*map(safe_str,

                                [root_path, GIST_STORE_LOC, gist_access_id])))

        cs = r.get_changeset()

        return (

         cs, [n for n in cs.get_node('/')]

        )

    def create(self, description, owner, gist_mapping,

               gist_type=Gist.GIST_PUBLIC, lifetime=-1):

        """

        :param description: description of the gist

        :param owner: user who created this gist

        :param gist_mapping: mapping {filename:{'content':content},...}

        :param gist_type: type of gist private/public

        :param lifetime: in minutes, -1 == forever

        """

        gist_id = safe_unicode(unique_id(20))

        lifetime = safe_int(lifetime, -1)

        gist_expires = time.time() + (lifetime * 60) if lifetime != -1 else -1

        log.debug('set GIST expiration date to: %s'

                  % (time_to_datetime(gist_expires)

                   if gist_expires != -1 else 'forever'))

        #create the Database version

        gist = Gist()

        gist.gist_description = description

        gist.gist_access_id = gist_id

        gist.gist_owner = owner.user_id

        gist.gist_expires = gist_expires

        gist.gist_type = safe_unicode(gist_type)

        self.sa.add(gist)

        self.sa.flush()

        if gist_type == Gist.GIST_PUBLIC:

            # use DB ID for easy to use GIST ID

            gist_id = safe_unicode(gist.gist_id)

            gist.gist_access_id = gist_id

            self.sa.add(gist)

        gist_repo_path = os.path.join(GIST_STORE_LOC, gist_id)

        log.debug('Creating new %s GIST repo in %s' % (gist_type, gist_repo_path))

        repo = RepoModel()._create_repo(repo_name=gist_repo_path, alias='hg',

                                        parent=None)

        processed_mapping = {}

        for filename in gist_mapping:

            content = gist_mapping[filename]['content']

            #TODO: expand support for setting explicit lexers

#             if lexer is None:

#                 try:

#                     lexer = pygments.lexers.guess_lexer_for_filename(filename,content)

#                 except pygments.util.ClassNotFound:

#                     lexer = 'text'

            processed_mapping[filename] = {'content': content}

        # now create single multifile commit

        message = 'added file'

        message += 's: ' if len(processed_mapping) > 1 else ': '

        message += ', '.join([x for x in processed_mapping])

        #fake RhodeCode Repository object

        fake_repo = AttributeDict(dict(

            repo_name=gist_repo_path,

            scm_instance_no_cache=lambda: repo,

        ))

        ScmModel().create_nodes(

            user=owner.user_id, repo=fake_repo,

            message=message,

            nodes=processed_mapping,

            trigger_push_hook=False

        )

        return gist

    def delete(self, gist, fs_remove=True):

        gist = self._get_gist(gist)

        try:

            self.sa.delete(gist)

            if fs_remove:

                self.__delete_gist(gist)

            else:

                log.debug('skipping removal from filesystem')

        except Exception:

            log.error(traceback.format_exc())

            raise