#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Copyright (C) 2017  Étienne Loks <etienne.loks_AT_peacefrogsDOTnet>

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero 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 Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# See the file COPYING for details.

from django.core.management.base import BaseCommand
from optparse import make_option
import sys

from ishtar_common.models import DocumentTemplate
from ishtar_common.utils import BColors


class Command(BaseCommand):
    help = "Update ODT templates from v1 to v2"
    option_list = BaseCommand.option_list + (
        make_option('--quiet',
                    action='store_true',
                    dest='quiet',
                    default=False,
                    help='Proceed silently with no interactive input.'),
    )

    def interactive_start(self):
        sys.stdout.write(
            BColors.HEADER + BColors.BOLD +
            "Update ODT templates from v1 to v2\n")
        sys.stdout.write(
            BColors.ENDC + BColors.WARNING +
            "This script need to be run only once. Running it on already "
            "migrated ODT files may be a source of error.\n")
        sys.stdout.write(BColors.ENDC)
        yes = None
        while yes != "yes":
            sys.stdout.write(
                "Are you sure you want to proceed? (yes/[n])\n")
            yes = input()
            if not yes or yes == "n":
                sys.stdout.write(BColors.FAIL + "Aborting\n")
                sys.stdout.write(BColors.ENDC)
                sys.exit()

    def handle(self, *args, **options):
        quiet = options['quiet']
        if not quiet:
            self.interactive_start()
        q = DocumentTemplate.objects
        nb = q.count()
        len_of_nb = str(len(str(nb)))
        if not quiet:
            sys.stdout.write(BColors.OKGREEN)

        errors = []
        for idx, document in enumerate(q.all()):
            if not quiet:
                sys.stdout.write(
                    ("Processing {:" + len_of_nb + "d}/{}\r").format(
                        idx + 1, nb))
                sys.stdout.flush()
                try:
                    document.convert_from_v1()
                except IOError as e:
                    errors.append("Document ({}): ".format(document.pk) +
                                  str(e))
        if errors:
            sys.stdout.write(BColors.FAIL + "Error while processing:\n")
            for error in errors:
                sys.stdout.write("* {}\n".format(error))

        sys.stdout.write(BColors.ENDC)
        print("\n\n")