from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy import Column, Integer, String, ForeignKey, Table
from sqlalchemy.orm import relationship

Base = declarative_base()

book_author = Table('book_author', Base.metadata,
                    Column('book_id', ForeignKey('books.id'), primary_key=True),
                    Column('author_id', ForeignKey('authors.id'), primary_key=True)
                    )

book_genre = Table('book_genre', Base.metadata,
                   Column('book_id', ForeignKey('books.id')),
                   Column('genre_id', ForeignKey('genres.id'))
                   )

book_interpreter = Table('book_interpreter', Base.metadata,
                         Column('book_id', ForeignKey('books.id'), primary_key=True),
                         Column('interpreter_id', ForeignKey('interpreters.id'), primary_key=True)
                         )


class Book(Base):
    __tablename__ = 'books'

    id = Column(Integer, primary_key=True)
    title = Column(String, nullable=False)
    number_of_pages = Column(Integer)
    printed_name = Column(String)
    description = Column(String)
    year_publish = Column(String)
    city_publish = Column(String)
    publisher = Column(String)
    in_language = Column(String)
    original_language = Column(String)
    image = relationship('Image', uselist=False, back_populates='book', cascade='all, delete, delete-orphan')
    isbn = relationship('Isbn', back_populates='book', lazy='dynamic', cascade='all, delete, delete-orphan')
    authors = relationship('Author', secondary=book_author, back_populates='books', lazy='dynamic')
    genres = relationship('Genre', secondary=book_genre, back_populates='books', lazy='dynamic')
    interpreters = relationship('Interpreter', secondary=book_interpreter, back_populates='books', lazy='dynamic')

    def __repr__(self):
        return '<Book %r>' % self.title


class Author(Base):
    __tablename__ = 'authors'

    id = Column(Integer, primary_key=True)
    name = Column(String, nullable=True)
    gender = Column(String)
    birth_date = Column(String)
    birth_place = Column(String)
    death_date = Column(String)
    death_place = Column(String)
    author_bio = Column(String)
    books = relationship('Book', secondary=book_author, back_populates='authors', lazy='dynamic')

    def __repr__(self):
        return '<Author %r' % self.name


class Genre(Base):
    __tablename__ = 'genres'

    id = Column(Integer, primary_key=True, autoincrement=True)
    name = Column(String, unique=True, sqlite_on_conflict_unique='IGNORE')
    books = relationship('Book', secondary=book_genre, back_populates='genres')

    def __repr__(self):
        return '<Genre %r' % self.name


class Interpreter(Base):
    __tablename__ = 'interpreters'

    id = Column(Integer, primary_key=True, autoincrement=True)
    name = Column(String)
    books = relationship('Book', secondary=book_interpreter, back_populates='interpreters')

    def __repr__(self):
        return '<Interpreter %r' % self.name


class Isbn(Base):
    __tablename__ = 'isbn'

    id = Column(Integer, primary_key=True, autoincrement=True)
    name = Column(String, nullable=False)
    book_id = Column(Integer, ForeignKey('books.id'))
    book = relationship('Book', back_populates='isbn')

    def __repr__(self):
        return '<ISBN %r' % self.name


class Image(Base):
    __tablename__ = 'images'

    checksum = Column(String, primary_key=True)
    path = Column(String, nullable=False, default='full/no_cover.jpg')
    book_id = Column(Integer, ForeignKey('books.id'))
    book = relationship('Book', back_populates='image')

    def __repr__(self):
        return '<Images %r' % self.checksum