#============================================================================
# This file is part of Pwman3.
#
# Pwman3 is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License, version 2
# as published by the Free Software Foundation;
#
# Pwman3 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 Pwman3; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
#============================================================================
# Copyright (C) 2013 Oz Nahum <nahumoz@gmail.com>
#============================================================================

import os
import shutil
import os.path
import time
import getpass
from pwman.util.crypto import CryptoEngine
import pwman.data.factory
from pwman.data.drivers import sqlite
from pwman.util.callback import Callback
#from pwman.data.nodes import Node
from pwman.data.nodes import NewNode


class CLICallback(Callback):
    def getinput(self, question):
        return raw_input(question)

    def getsecret(self, question):
        return getpass.getpass(question + ":")


class PwmanConvertDB(object):
    """
    Class to migrate from DB in version 0.3 to
    DB used in later versions.
    """

    def __init__(self, args, config):
        self.dbname = config.get_value('Database', 'filename')
        self.dbtype = config.get_value("Database", "type")
        print "Will convert the following Database: %s " % self.dbname
        if os.path.exists(config.get_value("Database", "filename")):
            dbver = pwman.data.factory.check_db_version(self.dbtype)
            self.dbver = float(dbver.strip("\'"))
        backup = '.backup-%s'.join(os.path.splitext(self.dbname)) % \
            time.strftime(
                '%Y-%m-%d-%H:%m')
        shutil.copy(self.dbname, backup)
        print "backup created in ", backup

    def read_old_db(self):
        "read the old db and get all nodes"
        self.db = pwman.data.factory.create(self.dbtype, self.dbver)
        enc = CryptoEngine.get()
        enc.set_callback(CLICallback())
        self.db.open()
        self.oldnodes = self.db.listnodes()
        self.oldnodes = self.db.getnodes(self.oldnodes)

    def create_new_db(self):
        newdb_name = '-newdb'.join(os.path.splitext(self.dbname))

        self.newdb = pwman.data.factory.create(self.dbtype, self.dbver,
                                               newdb_name)
        self.newdb._open()

    def convert_nodes(self):
        """convert old nodes instances to new format"""
        self.NewNodes = []
        for node in self.oldnodes:
            username = node.get_username()
            password = node.get_password()
            url = node.get_url()
            notes = node.get_notes()
            tags = node.get_tags()
            tags_strings = [tag.get_name() for tag in tags]
            self.newNode = NewNode(username=username,
                                   password=password,
                                   url=url,
                                   notes=notes,
                                   tags=tags_strings
                                   )

    def run(self):
        self.read_old_db()
        self.create_new_db()
        self.convert_nodes()