# Copyright 2010-2015  Lars Wirzenius
#
# 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 cliapp
import os
import shutil
import string
import time

import jtlib


class NewCommand(cliapp.Plugin):

    _default_new_note_template = '''\
[[!meta title="%(title)s"]]
[[!tag ]]
[[!meta date="%(date)s"]]
%(topiclink)s

'''

    def enable(self):
        self.app.add_subcommand('new', self.run, arg_synopsis='TITLE')

    def run(self, args):
        '''Create a new journal entry draft.'''

        self._check_args_and_settings(args)

        topic = self.app.settings['topic']
        values = {
            'title': args[0],
            'date': time.strftime('%Y-%m-%d %H:%M', self.app.now_tuple),
            'topiclink': self._get_topic_link(topic),
        }

        drafts_dir = jtlib.DraftsDirectory(self.app.drafts_dir())
        drafts_dir.create_if_missing()
        draft_id = drafts_dir.create_draft(
            self._get_new_note_template() % values)
        self.app.edit_file(drafts_dir.get_draft_pathname(draft_id))

    def _check_args_and_settings(self, args):
        if not args:
            raise cliapp.AppException('Usage: journal-note new TITLE')

        self.app.settings.require('source')
        topic = self.app.settings['topic']
        if topic and not self._topic_page_exists(topic):
            raise cliapp.AppException('Topic %s does not exist yet' % topic)

    def _topic_page_exists(self, topic):
        pathname = os.path.join(self.app.settings['source'], topic + '.mdwn')
        return os.path.exists(pathname)

    def _get_topic_link(self, topic):
        if topic:
            return '[[!meta link="%s"]]' % topic
        else:
            return ''

    def _get_new_note_template(self):
        filename = self.app.settings['new-note-template']
        if filename:
            with open(filename) as f:
                return f.read()
        else:
            return self._default_new_note_template