# -*- coding: utf-8 -*-

##########################################################################
# OpenLP - Open Source Lyrics Projection                                 #
# ---------------------------------------------------------------------- #
# Copyright (c) 2008-2022 OpenLP Developers                              #
# ---------------------------------------------------------------------- #
# 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 <https://www.gnu.org/licenses/>. #
##########################################################################
"""
The :mod:`liveworship` module provides the functionality for importing
a LiveWorship database into the OpenLP database.
"""
import logging

from lxml import etree

from openlp.core.common.i18n import translate
from openlp.plugins.songs.lib.importers.songimport import SongImport
from openlp.plugins.songs.lib.ui import SongStrings


log = logging.getLogger(__name__)


class LiveWorshipImport(SongImport):
    """
    The :class:`LiveWorshipImport` class provides the ability to import an XML dump frorm the
    LiveWorship Valentina Database.

    The approach is to get the user to use the Valentina Studio to dump the database content to a XML
    file that is then analysed for data extraction.
    """
    def __init__(self, manager, **kwargs):
        """
        Initialise the LiveWorship importer.
        """
        self.root = None
        super(LiveWorshipImport, self).__init__(manager, **kwargs)

    def do_import(self):
        """
        Receive a path to a LiveWorship (valentina) DB XML dump.
        """
        self.load_xml_dump()
        if self.root is None:
            return
        self.extract_songs()

    def load_xml_dump(self):
        self.import_wizard.increment_progress_bar(translate('SongsPlugin.LiveWorshipImport',
                                                            'Loading the extracting data'), 0)
        # The file can contain the EOT control character and certain invalid tags with missing attribute which
        # will make lxml fail, so it must be removed.
        xml_file = open(self.import_source, 'rt')
        xml_content = xml_file.read()
        xml_file.close()
        xml_content = xml_content.replace('\4', '**EOT**').replace('CustomProperty =""', 'CustomProperty a=""', 1)
        # Now load the XML
        parser = etree.XMLParser(remove_blank_text=True, recover=True)
        try:
            self.root = etree.fromstring(xml_content, parser)
        except etree.XMLSyntaxError:
            self.log_error(self.dump_file, SongStrings.XMLSyntaxError)
            log.exception('XML syntax error in file {path}'.format(path=str(self.dump_file)))

    def extract_songs(self):
        """
        Extract all the songs from the XML object
        """
        # Find song records
        xpath = "//BaseObjectData[@Name='SlideCol']/Record/f[@n='Type' and normalize-space(text())='song']/.."
        song_records = self.root.xpath(xpath)
        # Song count for progress bar
        song_count = len(song_records)
        # set progress bar to songcount
        self.import_wizard.progress_bar.setMaximum(song_count)
        for record in song_records:
            if self.stop_import_flag:
                break
            # reset to default values
            self.set_defaults()
            # Get song metadata
            title = record.xpath("f[@n='Title']/text()")
            song_rowid = record.xpath("f[@n='_rowid']/text()")
            if title and song_rowid:
                self.title = self.clean_string(title[0])
                song_rowid = self.clean_string(song_rowid[0])
            else:
                # if no title or no rowid we skip the song
                continue
            authors_line = record.xpath("f[@n='Author']/text()")
            if authors_line:
                self.extract_authors(authors_line[0])
            cpr = record.xpath("f[@n='Copyright']/text()")
            if cpr:
                self.add_copyright(self.clean_string(cpr[0]))
            ccli = record.xpath("f[@n='CCLI']/text()")
            if ccli:
                self.ccli = self.clean_string(ccli[0])
            # Get song tags
            self.extract_tags(song_rowid)
            # Get song verses
            self.extract_verses(song_rowid)
            if not self.finish():
                self.log_error(self.title)

    def extract_tags(self, song_id):
        """
        Extract the tags for a particular song
        """
        xpath = "//BaseObjectData[@Name='TagGroup']/Record/f[@n='SlideCol_rowid' "\
                "and normalize-space(text())='{rowid}']/.."
        tag_group_records = self.root.xpath(xpath.format(rowid=song_id))
        for record in tag_group_records:
            tag_rowid = record.xpath("f[@n='Tag_rowid']/text()")
            if tag_rowid:
                tag_rowid = self.clean_string(tag_rowid[0])
                xpath = "//BaseObjectData[@Name='Tag']/Record/f[@n='_rowid' and normalize-space(text())='{rowid}']/"\
                        "../f[@n='Description']/text()"
                tag = self.root.xpath(xpath.format(rowid=tag_rowid))
                if tag:
                    tag = self.clean_string(tag[0])
                    self.topics.append(tag)

    def extract_verses(self, song_id):
        """
        Extract the verses for a particular song
        """
        xpath = "//BaseObjectData[@Name='SlideColSlides']/Record/f[@n='SlideCol_rowid' and "\
                "normalize-space(text())='{rowid}']/.."
        slides_records = self.root.xpath(xpath.format(rowid=song_id))
        for record in slides_records:
            verse_text = record.xpath("f[@n='kText']/text()")
            if verse_text:
                verse_text = self.clean_verse(verse_text[0])
                verse_tag = record.xpath("f[@n='Description']/text()")
                if verse_tag:
                    verse_tag = self.convert_verse_name(verse_tag[0])
                else:
                    verse_tag = 'v'
                self.add_verse(verse_text, verse_tag)

    def extract_authors(self, authors_line):
        """
        Extract the authors as a list of str from the authors record
        """
        if not authors_line:
            return
        for author_name in authors_line.split('/'):
            name_parts = [self.clean_string(part) for part in author_name.split(',')][::-1]
            self.parse_author(' '.join(name_parts))

    def clean_string(self, string):
        """
        Clean up the strings
        """
        # &#x09; is tab
        return string.replace('^`^', '\'').replace('/', '-').replace('&#x09;', ' ').strip()

    def clean_verse(self, verse_line):
        """
        Extract the verse lines from the verse record
        """
        # &#x0D; is carriage return
        return self.clean_string(verse_line.replace('&#x0D;', '\n'))

    def convert_verse_name(self, verse_name):
        """
        Convert the Verse # to v#
        """
        name_parts = verse_name.lower().split()
        if len(name_parts) > 1:
            return name_parts[0][0] + name_parts[1]
        else:
            return name_parts[0][0]
