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

#  This file is part of the Calibre-Web (https://github.com/janeczku/calibre-web)
#    Copyright (C) 2012-2019 mutschler, cervinko, ok11, jkrehm, nanu-c, Wineliva,
#                            pjeby, elelay, idalin, Ozzieisaacs
#
#  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 <http://www.gnu.org/licenses/>.

from __future__ import division, print_function, unicode_literals
import sys
import os
import re
import ast

from sqlalchemy import create_engine
from sqlalchemy import Table, Column, ForeignKey
from sqlalchemy import String, Integer, Boolean, TIMESTAMP, Float, DateTime
from sqlalchemy.orm import relationship, sessionmaker, scoped_session
from sqlalchemy.ext.declarative import declarative_base


session = None
cc_exceptions = ['datetime', 'comments', 'composite', 'series']
cc_classes = {}
engine = None

Base = declarative_base()

books_authors_link = Table('books_authors_link', Base.metadata,
    Column('book', Integer, ForeignKey('books.id'), primary_key=True),
    Column('author', Integer, ForeignKey('authors.id'), primary_key=True)
    )

books_tags_link = Table('books_tags_link', Base.metadata,
    Column('book', Integer, ForeignKey('books.id'), primary_key=True),
    Column('tag', Integer, ForeignKey('tags.id'), primary_key=True)
    )

books_series_link = Table('books_series_link', Base.metadata,
    Column('book', Integer, ForeignKey('books.id'), primary_key=True),
    Column('series', Integer, ForeignKey('series.id'), primary_key=True)
    )

books_ratings_link = Table('books_ratings_link', Base.metadata,
    Column('book', Integer, ForeignKey('books.id'), primary_key=True),
    Column('rating', Integer, ForeignKey('ratings.id'), primary_key=True)
    )

books_languages_link = Table('books_languages_link', Base.metadata,
    Column('book', Integer, ForeignKey('books.id'), primary_key=True),
    Column('lang_code', Integer, ForeignKey('languages.id'), primary_key=True)
    )

books_publishers_link = Table('books_publishers_link', Base.metadata,
    Column('book', Integer, ForeignKey('books.id'), primary_key=True),
    Column('publisher', Integer, ForeignKey('publishers.id'), primary_key=True)
    )


class Identifiers(Base):
    __tablename__ = 'identifiers'

    id = Column(Integer, primary_key=True)
    type = Column(String)
    val = Column(String)
    book = Column(Integer, ForeignKey('books.id'))

    def __init__(self, val, id_type, book):
        self.val = val
        self.type = id_type
        self.book = book

    def formatType(self):
        if self.type == "amazon":
            return u"Amazon"
        elif self.type == "isbn":
            return u"ISBN"
        elif self.type == "doi":
            return u"DOI"
        elif self.type == "goodreads":
            return u"Goodreads"
        elif self.type == "google":
            return u"Google Books"
        elif self.type == "kobo":
            return u"Kobo"
        if self.type == "lubimyczytac":
            return u"Lubimyczytac"
        else:
            return self.type

    def __repr__(self):
        if self.type == "amazon":
            return u"https://amzn.com/{0}".format(self.val)
        elif self.type == "isbn":
            return u"http://www.worldcat.org/isbn/{0}".format(self.val)
        elif self.type == "doi":
            return u"http://dx.doi.org/{0}".format(self.val)
        elif self.type == "goodreads":
            return u"http://www.goodreads.com/book/show/{0}".format(self.val)
        elif self.type == "douban":
            return u"https://book.douban.com/subject/{0}".format(self.val)
        elif self.type == "google":
            return u"https://books.google.com/books?id={0}".format(self.val)
        elif self.type == "kobo":
            return u"https://www.kobo.com/ebook/{0}".format(self.val)
        elif self.type == "lubimyczytac":
            return u" http://lubimyczytac.pl/ksiazka/{0}".format(self.val)
        elif self.type == "url":
            return u"{0}".format(self.val)
        else:
            return u""


class Comments(Base):
    __tablename__ = 'comments'

    id = Column(Integer, primary_key=True)
    text = Column(String)
    book = Column(Integer, ForeignKey('books.id'))

    def __init__(self, text, book):
        self.text = text
        self.book = book

    def __repr__(self):
        return u"<Comments({0})>".format(self.text)


class Tags(Base):
    __tablename__ = 'tags'

    id = Column(Integer, primary_key=True, autoincrement=True)
    name = Column(String)

    def __init__(self, name):
        self.name = name

    def __repr__(self):
        return u"<Tags('{0})>".format(self.name)


class Authors(Base):
    __tablename__ = 'authors'

    id = Column(Integer, primary_key=True)
    name = Column(String)
    sort = Column(String)
    link = Column(String)

    def __init__(self, name, sort, link):
        self.name = name
        self.sort = sort
        self.link = link

    def __repr__(self):
        return u"<Authors('{0},{1}{2}')>".format(self.name, self.sort, self.link)


class Series(Base):
    __tablename__ = 'series'

    id = Column(Integer, primary_key=True)
    name = Column(String)
    sort = Column(String)

    def __init__(self, name, sort):
        self.name = name
        self.sort = sort

    def __repr__(self):
        return u"<Series('{0},{1}')>".format(self.name, self.sort)


class Ratings(Base):
    __tablename__ = 'ratings'

    id = Column(Integer, primary_key=True)
    rating = Column(Integer)

    def __init__(self, rating):
        self.rating = rating

    def __repr__(self):
        return u"<Ratings('{0}')>".format(self.rating)


class Languages(Base):
    __tablename__ = 'languages'

    id = Column(Integer, primary_key=True)
    lang_code = Column(String)

    def __init__(self, lang_code):
        self.lang_code = lang_code

    def __repr__(self):
        return u"<Languages('{0}')>".format(self.lang_code)


class Publishers(Base):
    __tablename__ = 'publishers'

    id = Column(Integer, primary_key=True)
    name = Column(String)
    sort = Column(String)

    def __init__(self, name, sort):
        self.name = name
        self.sort = sort

    def __repr__(self):
        return u"<Publishers('{0},{1}')>".format(self.name, self.sort)


class Data(Base):
    __tablename__ = 'data'

    id = Column(Integer, primary_key=True)
    book = Column(Integer, ForeignKey('books.id'))
    format = Column(String)
    uncompressed_size = Column(Integer)
    name = Column(String)

    def __init__(self, book, book_format, uncompressed_size, name):
        self.book = book
        self.format = book_format
        self.uncompressed_size = uncompressed_size
        self.name = name

    def __repr__(self):
        return u"<Data('{0},{1}{2}{3}')>".format(self.book, self.format, self.uncompressed_size, self.name)


class Books(Base):
    __tablename__ = 'books'

    DEFAULT_PUBDATE = "0101-01-01 00:00:00+00:00"

    id = Column(Integer, primary_key=True)
    title = Column(String)
    sort = Column(String)
    author_sort = Column(String)
    timestamp = Column(TIMESTAMP)
    pubdate = Column(String)
    series_index = Column(String)
    last_modified = Column(TIMESTAMP)
    path = Column(String)
    has_cover = Column(Integer)
    uuid = Column(String)

    authors = relationship('Authors', secondary=books_authors_link, backref='books')
    tags = relationship('Tags', secondary=books_tags_link, backref='books',order_by="Tags.name")
    comments = relationship('Comments', backref='books')
    data = relationship('Data', backref='books')
    series = relationship('Series', secondary=books_series_link, backref='books')
    ratings = relationship('Ratings', secondary=books_ratings_link, backref='books')
    languages = relationship('Languages', secondary=books_languages_link, backref='books')
    publishers = relationship('Publishers', secondary=books_publishers_link, backref='books')
    identifiers = relationship('Identifiers', backref='books')

    def __init__(self, title, sort, author_sort, timestamp, pubdate, series_index, last_modified, path, has_cover,
                 authors, tags, languages=None):
        self.title = title
        self.sort = sort
        self.author_sort = author_sort
        self.timestamp = timestamp
        self.pubdate = pubdate
        self.series_index = series_index
        self.last_modified = last_modified
        self.path = path
        self.has_cover = has_cover

    def __repr__(self):
        return u"<Books('{0},{1}{2}{3}{4}{5}{6}{7}{8}')>".format(self.title, self.sort, self.author_sort,
                                                                 self.timestamp, self.pubdate, self.series_index,
                                                                 self.last_modified, self.path, self.has_cover)

    @property
    def atom_timestamp(self):
        return (self.timestamp.strftime('%Y-%m-%dT%H:%M:%S+00:00') or '')

class Custom_Columns(Base):
    __tablename__ = 'custom_columns'

    id = Column(Integer, primary_key=True)
    label = Column(String)
    name = Column(String)
    datatype = Column(String)
    mark_for_delete = Column(Boolean)
    editable = Column(Boolean)
    display = Column(String)
    is_multiple = Column(Boolean)
    normalized = Column(Boolean)

    def get_display_dict(self):
        display_dict = ast.literal_eval(self.display)
        if sys.version_info < (3, 0):
            display_dict['enum_values'] = [x.decode('unicode_escape') for x in display_dict['enum_values']]
        return display_dict


def update_title_sort(config, conn=None):
    # user defined sort function for calibre databases (Series, etc.)
    def _title_sort(title):
        # calibre sort stuff
        title_pat = re.compile(config.config_title_regex, re.IGNORECASE)
        match = title_pat.search(title)
        if match:
            prep = match.group(1)
            title = title.replace(prep, '') + ', ' + prep
        return title.strip()

    conn = conn or session.connection().connection.connection
    conn.create_function("title_sort", 1, _title_sort)


def setup_db(config):
    dispose()
    global engine

    if not config.config_calibre_dir:
        config.invalidate()
        return False

    dbpath = os.path.join(config.config_calibre_dir, "metadata.db")
    if not os.path.exists(dbpath):
        config.invalidate()
        return False

    try:
        engine = create_engine('sqlite:///{0}'.format(dbpath),
                               echo=False,
                               isolation_level="SERIALIZABLE",
                               connect_args={'check_same_thread': False})
        conn = engine.connect()
        # conn.text_factory = lambda b: b.decode(errors = 'ignore') possible fix for #1302
    except Exception as e:
        config.invalidate(e)
        return False

    config.db_configured = True
    update_title_sort(config, conn.connection)

    if not cc_classes:
        cc = conn.execute("SELECT id, datatype FROM custom_columns")

        cc_ids = []
        books_custom_column_links = {}
        for row in cc:
            if row.datatype not in cc_exceptions:
                books_custom_column_links[row.id] = Table('books_custom_column_' + str(row.id) + '_link', Base.metadata,
                                                          Column('book', Integer, ForeignKey('books.id'),
                                                                 primary_key=True),
                                                          Column('value', Integer,
                                                                 ForeignKey('custom_column_' + str(row.id) + '.id'),
                                                                 primary_key=True)
                                                          )
                cc_ids.append([row.id, row.datatype])
                if row.datatype == 'bool':
                    ccdict = {'__tablename__': 'custom_column_' + str(row.id),
                              'id': Column(Integer, primary_key=True),
                              'book': Column(Integer, ForeignKey('books.id')),
                              'value': Column(Boolean)}
                elif row.datatype == 'int':
                    ccdict = {'__tablename__': 'custom_column_' + str(row.id),
                              'id': Column(Integer, primary_key=True),
                              'book': Column(Integer, ForeignKey('books.id')),
                              'value': Column(Integer)}
                elif row.datatype == 'float':
                    ccdict = {'__tablename__': 'custom_column_' + str(row.id),
                              'id': Column(Integer, primary_key=True),
                              'book': Column(Integer, ForeignKey('books.id')),
                              'value': Column(Float)}
                else:
                    ccdict = {'__tablename__': 'custom_column_' + str(row.id),
                              'id': Column(Integer, primary_key=True),
                              'value': Column(String)}
                cc_classes[row.id] = type(str('Custom_Column_' + str(row.id)), (Base,), ccdict)

        for cc_id in cc_ids:
            if (cc_id[1] == 'bool') or (cc_id[1] == 'int') or (cc_id[1] == 'float'):
                setattr(Books, 'custom_column_' + str(cc_id[0]), relationship(cc_classes[cc_id[0]],
                                                                           primaryjoin=(
                                                                           Books.id == cc_classes[cc_id[0]].book),
                                                                           backref='books'))
            else:
                setattr(Books, 'custom_column_' + str(cc_id[0]), relationship(cc_classes[cc_id[0]],
                                                                           secondary=books_custom_column_links[cc_id[0]],
                                                                           backref='books'))


    global session
    Session = scoped_session(sessionmaker(autocommit=False,
                                             autoflush=False,
                                             bind=engine))
    session = Session()
    return True


def dispose():
    global session

    old_session = session
    session = None
    if old_session:
        try: old_session.close()
        except: pass
        if old_session.bind:
            try: old_session.bind.dispose()
            except: pass

    for attr in list(Books.__dict__.keys()):
        if attr.startswith("custom_column_"):
            setattr(Books, attr, None)

    for db_class in cc_classes.values():
        Base.metadata.remove(db_class.__table__)
    cc_classes.clear()

    for table in reversed(Base.metadata.sorted_tables):
        name = table.key
        if name.startswith("custom_column_") or name.startswith("books_custom_column_"):
            if table is not None:
                Base.metadata.remove(table)

def reconnect_db(config):
    session.close()
    engine.dispose()
    setup_db(config)