#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# Copyright 2008-2009 Zuza Software Foundation
#
# This file is part of Virtaal.
#
# 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 2 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/>.

"""Plugin to import data from other applications.

Currently there is some support for importing settings from Poedit and
Lokalize. Translation Memory can be imported from Poedit and Lokalize.
"""

try:
    import bsddb
except ImportError:
    bsddb = None
import logging
import os
import struct
import sys
from os import path

from six.moves import cStringIO as StringIO
from six.moves import configparser as ConfigParser

try:
    from sqlite3 import dbapi2
except ImportError:
    from pysqlite2 import dbapi2

from virtaal.common import pan_app
from virtaal.controllers.baseplugin import BasePlugin

from translate.storage.pypo import extractpoline
from translate.storage import tmdb


def _prepare_db_string(string):
    """Helper method needed by the Berkeley DB TM converters."""
    string = '"%s"' % string
    string = unicode(extractpoline(string), 'utf-8')
    return string

class Plugin(BasePlugin):
    description = _('Migrate settings from KBabel, Lokalize and/or Poedit to Virtaal.')
    display_name = _('Migration Assistant')
    version = 0.1

    default_config = {
        "tmdb": path.join(pan_app.get_config_dir(), "tm.db")
    }

    def __init__(self, internal_name, main_controller):
        self.internal_name = internal_name
        self.main_controller = main_controller
        self.load_config()
        self._init_plugin()

    def _init_plugin(self):
        message = _('Should Virtaal try to import settings and data from other applications?')
        must_migrate = self.main_controller.show_prompt(_('Import data from other applications?'), message)
        if not must_migrate:
            logging.debug('Migration not done due to user choice')
        else:
            # We'll store the tm here:
            self.tmdb = tmdb.TMDB(self.config["tmdb"])
            # We actually need source, target, context, targetlanguage
            self.migrated = []

            if sys.platform == "darwin":
                self.poedit_dir = path.expanduser('~/Library/Preferences')
            else:
                self.poedit_dir = path.expanduser('~/.poedit')

            #TODO: check if we can do better than hardcoding the kbabel location
            #this path is specified in ~/.kde/config/kbabel.defaultproject and kbabeldictrc
            self.kbabel_dir = path.expanduser('~/.kde/share/apps/kbabeldict/dbsearchengine')

            self.lokalize_rc = path.expanduser('~/.kde/share/config/lokalizerc')
            self.lokalize_tm_dir = path.expanduser('~/.kde/share/apps/lokalize/')

            self.poedit_settings_import()
            self.poedit_tm_import()
            self.kbabel_tm_import()
            self.lokalize_settings_import()
            self.lokalize_tm_import()

            if self.migrated:
                message = _('Migration was successfully completed') + '\n\n'
                message += _('The following items were migrated:') + '\n\n'
                message += u"\n".join([u" • %s" % item for item in self.migrated])
                #   (we can mark this ^^^ for translation if somebody asks)
                self.main_controller.show_info(_('Migration completed'), message)
            else:
                message = _("Virtaal was not able to migrate any settings or data")
                self.main_controller.show_info(_('Nothing migrated'), message)
            logging.debug('Migration plugin executed')

        pan_app.settings.plugin_state[self.internal_name] = "disabled"

    def poedit_settings_import(self):
        """Attempt to import the settings from Poedit."""
        if sys.platform == 'darwin':
            config_filename = path.join(self.poedit_dir, 'net.poedit.Poedit.cfg')
        else:
            config_filename = path.join(self.poedit_dir, 'config')
        get_thing = None
        if not path.exists(config_filename):
            try:
                import _winreg
            except Exception as e:
                return

            def get_thing(section, item):
                key = None
                try:
                    key = _winreg.OpenKey(_winreg.HKEY_CURRENT_USER, r"Software\Vaclav Slavik\Poedit\%s" % section)
                except WindowsError:
                    return

                data = None
                try:
                    # This is very inefficient, but who cares?
                    for i in range(100):
                        name, data, type = _winreg.EnumValue(key, i)
                        if name == item:
                            break
                except EnvironmentError as e:
                    pass
                except Exception as e:
                    logging.exception("Error obtaining from registry: %s, %s", section, item)
                return data

        else:
            self.poedit_config = ConfigParser.ConfigParser()
            poedit_config_file = open(config_filename, 'r')
            contents = StringIO.StringIO('[poedit_headerless_file]\n' + poedit_config_file.read())
            poedit_config_file.close()
            self.poedit_config.readfp(contents)
            def get_thing(section, item):
                dictionary = dict(self.poedit_config.items(section or 'poedit_headerless_file'))
                return dictionary.get(item, None)

        if get_thing is None:
            return

        lastdir = get_thing('', 'last_file_path')
        name = get_thing('', 'translator_name')
        translator_email = get_thing('', 'translator_email')

        if lastdir:
            pan_app.settings.general['lastdir'] = lastdir
        if name:
            pan_app.settings.translator['name'] = name
        if translator_email:
            pan_app.settings.translator['email'] = translator_email

        self.poedit_database_path = get_thing('TM', 'database_path')
        self.poedit_languages = []
        languages = get_thing('TM', 'languages')
        if languages:
            self.poedit_languages = languages.split(':')

        if lastdir or name or translator_email:
            pan_app.settings.write()
            self.migrated.append(_("Poedit settings"))

    def poedit_tm_import(self):
        """Attempt to import the Translation Memory used in KBabel."""
        if bsddb is None or not hasattr(self, "poedit_database_path"):
            return

        # import each language separately
        for lang in self.poedit_languages:
            strings_db_file = path.join(self.poedit_database_path, lang, 'strings.db')
            translations_db_file = path.join(self.poedit_database_path, lang, 'translations.db')
            if not path.exists(strings_db_file) or not path.exists(translations_db_file):
                continue
            sources = bsddb.hashopen(strings_db_file, 'r')
            targets = bsddb.rnopen(translations_db_file, 'r')
            for source, str_index in sources.iteritems():
                unit = {"context" : ""}
                # the index is a four byte integer encoded as a string
                # was little endian on my machine, not sure if it is universal
                index = struct.unpack('i', str_index)
                target = targets[index[0]][:-1] # null-terminated
                unit["source"] = _prepare_db_string(source)
                unit["target"] = _prepare_db_string(target)
                self.tmdb.add_dict(unit, "en", lang, commit=False)
            self.tmdb.connection.commit()

            logging.debug('%d units migrated from Poedit TM: %s.' % (len(sources), lang))
            sources.close()
            targets.close()
            self.migrated.append(_("Poedit's Translation Memory: %(database_language_code)s") % \
                    {"database_language_code": lang})

    def kbabel_tm_import(self):
        """Attempt to import the Translation Memory used in KBabel."""
        if bsddb is None or not path.exists(self.kbabel_dir):
            return
        for tm_filename in os.listdir(self.kbabel_dir):
            if not tm_filename.startswith("translations.") or not tm_filename.endswith(".db"):
                continue
            tm_file = path.join(self.kbabel_dir, tm_filename)
            lang = tm_filename.replace("translations.", "").replace(".db", "")
            translations = bsddb.btopen(tm_file, 'r')

            for source, target in translations.iteritems():
                unit = {"context" : ""}
                source = source[:-1] # null-terminated
                target = target[16:-1] # 16 bytes of padding, null-terminated
                unit["source"] = _prepare_db_string(source)
                unit["target"] = _prepare_db_string(target)
                self.tmdb.add_dict(unit, "en", lang, commit=False)
            self.tmdb.connection.commit()

            logging.debug('%d units migrated from KBabel %s TM.' % (len(translations), lang))
            translations.close()
            self.migrated.append(_("KBabel's Translation Memory: %(database_language_code)s") % \
                      {"database_language_code": lang})

    def lokalize_settings_import(self):
        """Attempt to import the settings from Lokalize."""
        if not path.exists(self.lokalize_rc):
            return

        lokalize_config = ConfigParser.ConfigParser()
        lokalize_config.read(self.lokalize_rc)
        lokalize_identity = dict(lokalize_config.items('Identity'))

        pan_app.settings.translator['name'] = lokalize_identity['authorname']
        pan_app.settings.translator['email'] = lokalize_identity['authoremail']
        pan_app.settings.translator['team'] = lokalize_identity['defaultmailinglist']
        pan_app.settings.general['lastdir'] = path.dirname(dict(lokalize_config.items('State'))['project'])

        pan_app.settings.write()
        self.migrated.append(_("Lokalize settings"))

    def lokalize_tm_import(self):
        """Attempt to import the Translation Memory used in Lokalize."""
        if not path.isdir(self.lokalize_tm_dir):
            return
        databases = [name for name in os.listdir(self.lokalize_tm_dir) if path.exists(name)]
        for database in databases:
            self.do_lokalize_tm_import(database)

    def do_lokalize_tm_import(self, filename):
        """Import the given Translation Memory file used by Lokalize."""
        lang = self.main_controller.lang_controller.target_lang.code
        connection = dbapi2.connect(filename)
        cursor = connection.cursor()
        cursor.execute("""SELECT english, target from tm_main;""")
        for (source, target) in cursor:
            unit = { "source" : source,
                     "target" : target,
                     "context" : ""
                     }
            self.tmdb.add_dict(unit, "en", lang, commit=False)
        self.tmdb.connection.commit()
        connection.close()
        self.migrated.append(_("Lokalize's Translation Memory: %(database_name)s") % \
                {"database_name": path.basename(filename)})
