# -*- coding: utf-8 -*-
# vim: autoindent shiftwidth=4 expandtab textwidth=120 tabstop=4 softtabstop=4

###############################################################################
# OpenLP - Open Source Lyrics Projection                                      #
# --------------------------------------------------------------------------- #
# Copyright (c) 2008-2013 Raoul Snyman                                        #
# Portions copyright (c) 2008-2013 Tim Bentley, Gerald Britton, Jonathan      #
# Corwin, Samuel Findlay, Michael Gorven, Scott Guerrieri, Matthias Hub,      #
# Meinert Jordan, Armin Köhler, Erik Lundin, Edwin Lunando, Brian T. Meyer.   #
# Joshua Miller, Stevan Pettit, Andreas Preikschat, Mattias Põldaru,          #
# Christian Richter, Philip Ridout, Simon Scudder, Jeffrey Smith,             #
# Maikel Stuivenberg, Martin Thompson, Jon Tibble, Dave Warnock,              #
# Frode Woldsund, Martin Zibricky, Patrick Zimmermann                         #
# --------------------------------------------------------------------------- #
# 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; version 2 of the License.                              #
#                                                                             #
# 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, write to the Free Software Foundation, Inc., 59  #
# Temple Place, Suite 330, Boston, MA 02111-1307 USA                          #
###############################################################################
"""
The :mod:`olpimport` module provides the functionality for importing OpenLP
song databases into the current installation database.
"""
import logging

from sqlalchemy import create_engine, MetaData, Table
from sqlalchemy.orm import class_mapper, mapper, relation, scoped_session, sessionmaker
from sqlalchemy.orm.exc import UnmappedClassError

from openlp.core.lib import translate
from openlp.core.lib.db import BaseModel
from openlp.core.ui.wizard import WizardStrings
from openlp.plugins.songs.lib import clean_song
from openlp.plugins.songs.lib.db import Author, Book, Song, Topic, MediaFile
from .songimport import SongImport

log = logging.getLogger(__name__)

class OpenLPSongImport(SongImport):
    """
    The :class:`OpenLPSongImport` class provides OpenLP with the ability to
    import song databases from other installations of OpenLP.
    """
    def __init__(self, manager, **kwargs):
        """
        Initialise the import.

        ``manager``
            The song manager for the running OpenLP installation.

        ``source_db``
            The database providing the data to import.
        """
        SongImport.__init__(self, manager, **kwargs)
        self.sourceSession = None

    def doImport(self, progressDialog=None):
        """
        Run the import for an OpenLP version 2 song database.

        ``progressDialog``
            The QProgressDialog used when importing songs from the FRW.
        """

        class OldAuthor(BaseModel):
            """
            Author model
            """
            pass


        class OldBook(BaseModel):
            """
            Book model
            """
            pass


        class OldMediaFile(BaseModel):
            """
            MediaFile model
            """
            pass


        class OldSong(BaseModel):
            """
            Song model
            """
            pass


        class OldTopic(BaseModel):
            """
            Topic model
            """
            pass

        # Check the file type
        if not self.import_source.endswith('.sqlite'):
            self.logError(self.import_source,
                translate('SongsPlugin.OpenLPSongImport', 'Not a valid OpenLP 2.0 song database.'))
            return
        self.import_source = 'sqlite:///%s' % self.import_source
        # Load the db file
        engine = create_engine(self.import_source)
        source_meta = MetaData()
        source_meta.reflect(engine)
        self.sourceSession = scoped_session(sessionmaker(bind=engine))
        if 'media_files' in list(source_meta.tables.keys()):
            has_media_files = True
        else:
            has_media_files = False
        source_authors_table = source_meta.tables['authors']
        source_song_books_table = source_meta.tables['song_books']
        source_songs_table = source_meta.tables['songs']
        source_topics_table = source_meta.tables['topics']
        source_authors_songs_table = source_meta.tables['authors_songs']
        source_songs_topics_table = source_meta.tables['songs_topics']
        source_media_files_songs_table = None
        if has_media_files:
            source_media_files_table = source_meta.tables['media_files']
            source_media_files_songs_table = source_meta.tables.get('media_files_songs')
            try:
                class_mapper(OldMediaFile)
            except UnmappedClassError:
                mapper(OldMediaFile, source_media_files_table)
        song_props = {
            'authors': relation(OldAuthor, backref='songs',
            secondary=source_authors_songs_table),
            'book': relation(OldBook, backref='songs'),
            'topics': relation(OldTopic, backref='songs',
            secondary=source_songs_topics_table)
        }
        if has_media_files:
            if isinstance(source_media_files_songs_table, Table):
                song_props['media_files'] = relation(OldMediaFile,
                    backref='songs',
                    secondary=source_media_files_songs_table)
            else:
                song_props['media_files'] = relation(OldMediaFile,
                    backref='songs',
                    foreign_keys=[source_media_files_table.c.song_id],
                    primaryjoin=source_songs_table.c.id == source_media_files_table.c.song_id)
        try:
            class_mapper(OldAuthor)
        except UnmappedClassError:
            mapper(OldAuthor, source_authors_table)
        try:
            class_mapper(OldBook)
        except UnmappedClassError:
            mapper(OldBook, source_song_books_table)
        try:
            class_mapper(OldSong)
        except UnmappedClassError:
            mapper(OldSong, source_songs_table, properties=song_props)
        try:
            class_mapper(OldTopic)
        except UnmappedClassError:
            mapper(OldTopic, source_topics_table)

        source_songs = self.sourceSession.query(OldSong).all()
        if self.import_wizard:
            self.import_wizard.progress_bar.setMaximum(len(source_songs))
        for song in source_songs:
            new_song = Song()
            new_song.title = song.title
            if has_media_files and hasattr(song, 'alternate_title'):
                new_song.alternate_title = song.alternate_title
            else:
                old_titles = song.search_title.split('@')
                if len(old_titles) > 1:
                    new_song.alternate_title = old_titles[1]
            # Values will be set when cleaning the song.
            new_song.search_title = ''
            new_song.search_lyrics = ''
            new_song.song_number = song.song_number
            new_song.lyrics = song.lyrics
            new_song.verse_order = song.verse_order
            new_song.copyright = song.copyright
            new_song.comments = song.comments
            new_song.theme_name = song.theme_name
            new_song.ccli_number = song.ccli_number
            for author in song.authors:
                existing_author = self.manager.get_object_filtered(Author, Author.display_name == author.display_name)
                if existing_author is None:
                    existing_author = Author.populate(
                        first_name=author.first_name,
                        last_name=author.last_name,
                        display_name=author.display_name)
                new_song.authors.append(existing_author)
            if song.book:
                existing_song_book = self.manager.get_object_filtered(Book, Book.name == song.book.name)
                if existing_song_book is None:
                    existing_song_book = Book.populate(name=song.book.name, publisher=song.book.publisher)
                new_song.book = existing_song_book
            if song.topics:
                for topic in song.topics:
                    existing_topic = self.manager.get_object_filtered(Topic, Topic.name == topic.name)
                    if existing_topic is None:
                        existing_topic = Topic.populate(name=topic.name)
                    new_song.topics.append(existing_topic)
            if has_media_files:
                if song.media_files:
                    for media_file in song.media_files:
                        existing_media_file = self.manager.get_object_filtered(MediaFile,
                                MediaFile.file_name == media_file.file_name)
                        if existing_media_file:
                            new_song.media_files.append(existing_media_file)
                        else:
                            new_song.media_files.append(MediaFile.populate(file_name=media_file.file_name))
            clean_song(self.manager, new_song)
            self.manager.save_object(new_song)
            if progressDialog:
                progressDialog.setValue(progressDialog.value() + 1)
                progressDialog.setLabelText(WizardStrings.ImportingType % new_song.title)
            else:
                self.import_wizard.increment_progress_bar(WizardStrings.ImportingType % new_song.title)
            if self.stop_import_flag:
                break
        engine.dispose()
