from sqlalchemy import BigInteger, String, Text, Numeric, Integer, DateTime, Boolean, ForeignKey, Table, Column, Date
from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column, relationship
from datetime import datetime, date
from typing import Optional, List


class Base(DeclarativeBase):
    pass


# Many-to-Many таблицы
books_book_authors = Table(
    'books_book_authors',
    Base.metadata,
    Column('id', BigInteger, primary_key=True),
    Column('book_id', BigInteger, ForeignKey('books_book.id')),
    Column('author_id', BigInteger, ForeignKey('books_author.id'))
)

books_book_genres = Table(
    'books_book_genres',
    Base.metadata,
    Column('id', BigInteger, primary_key=True),
    Column('book_id', BigInteger, ForeignKey('books_book.id')),
    Column('genre_id', BigInteger, ForeignKey('books_genre.id'))
)

# Many-to-Many для любимых жанров пользователя
users_user_favorite_genres = Table(
    'users_user_favorite_genres',
    Base.metadata,
    Column('id', BigInteger, primary_key=True),
    Column('user_id', BigInteger, ForeignKey('users_user.id')),
    Column('genre_id', BigInteger, ForeignKey('books_genre.id'))
)


class User(Base):
    """
    Модель пользователя из Django приложения 'users'
    Таблица: users_user
    """
    __tablename__ = 'users_user'
    
    # Стандартные поля Django AbstractUser
    id: Mapped[int] = mapped_column(BigInteger, primary_key=True)
    password: Mapped[str] = mapped_column(String(128))
    last_login: Mapped[Optional[datetime]] = mapped_column(DateTime, nullable=True)
    is_superuser: Mapped[bool] = mapped_column(Boolean, default=False)
    username: Mapped[str] = mapped_column(String(150), unique=True)
    first_name: Mapped[str] = mapped_column(String(150), default='')
    last_name: Mapped[str] = mapped_column(String(150), default='')
    email: Mapped[str] = mapped_column(String(254), unique=True)
    is_staff: Mapped[bool] = mapped_column(Boolean, default=False)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True)
    date_joined: Mapped[datetime] = mapped_column(DateTime)
    
    # Дополнительные поля из модели users.User
    phone: Mapped[str] = mapped_column(String(20), default='')
    avatar: Mapped[Optional[str]] = mapped_column(String(100), nullable=True)
    birth_date: Mapped[Optional[date]] = mapped_column(Date, nullable=True)
    about: Mapped[str] = mapped_column(Text, default='')
    telegram_id: Mapped[Optional[int]] = mapped_column(BigInteger, unique=True, nullable=True)
    is_verified: Mapped[bool] = mapped_column(Boolean, default=False)
    last_activity: Mapped[Optional[datetime]] = mapped_column(DateTime, nullable=True)
    
    # Relationships
    favorites: Mapped[List["Favorite"]] = relationship(back_populates="user")
    favorite_genres: Mapped[List["Genre"]] = relationship(
        secondary=users_user_favorite_genres,
        back_populates="users"
    )


class Author(Base):
    __tablename__ = 'books_author'
    
    id: Mapped[int] = mapped_column(BigInteger, primary_key=True)
    name: Mapped[str] = mapped_column(String(255))
    
    books: Mapped[List["Book"]] = relationship(secondary=books_book_authors, back_populates="authors")


class Genre(Base):
    __tablename__ = 'books_genre'
    
    id: Mapped[int] = mapped_column(BigInteger, primary_key=True)
    name: Mapped[str] = mapped_column(String(100))
    
    books: Mapped[List["Book"]] = relationship(secondary=books_book_genres, back_populates="genres")
    users: Mapped[List[User]] = relationship(
        secondary=users_user_favorite_genres,
        back_populates="favorite_genres"
    )


class Book(Base):
    __tablename__ = 'books_book'
    
    id: Mapped[int] = mapped_column(BigInteger, primary_key=True)
    title: Mapped[str] = mapped_column(String(500))
    description: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
    cover_url: Mapped[Optional[str]] = mapped_column(String(500), nullable=True)
    average_rating: Mapped[Optional[float]] = mapped_column(Numeric(3, 2), nullable=True)
    rating_count: Mapped[int] = mapped_column(Integer, default=0)
    language: Mapped[Optional[str]] = mapped_column(String(10), nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime)
    updated_at: Mapped[datetime] = mapped_column(DateTime)
    deleted_at: Mapped[Optional[datetime]] = mapped_column(DateTime, nullable=True)
    
    authors: Mapped[List[Author]] = relationship(secondary=books_book_authors, back_populates="books")
    genres: Mapped[List[Genre]] = relationship(secondary=books_book_genres, back_populates="books")
    favorites: Mapped[List["Favorite"]] = relationship(back_populates="book")


class Favorite(Base):
    __tablename__ = 'books_favorite'
    
    id: Mapped[int] = mapped_column(BigInteger, primary_key=True)
    user_id: Mapped[int] = mapped_column(BigInteger, ForeignKey('users_user.id'))
    book_id: Mapped[int] = mapped_column(BigInteger, ForeignKey('books_book.id'))
    created_at: Mapped[datetime] = mapped_column(DateTime)
    
    user: Mapped[User] = relationship(back_populates="favorites")
    book: Mapped[Book] = relationship(back_populates="favorites")


class UserPreferences(Base):
    """
    Настройки пользователя из Django приложения 'users'
    Таблица: users_userpreferences
    """
    __tablename__ = 'users_userpreferences'
    
    id: Mapped[int] = mapped_column(BigInteger, primary_key=True)
    user_id: Mapped[int] = mapped_column(BigInteger, ForeignKey('users_user.id'), unique=True)
    created_at: Mapped[datetime] = mapped_column(DateTime)
    updated_at: Mapped[datetime] = mapped_column(DateTime)
    language: Mapped[str] = mapped_column(String(10), default='ru')
    theme: Mapped[str] = mapped_column(String(20), default='light')
    email_notifications: Mapped[bool] = mapped_column(Boolean, default=True)
    telegram_notifications: Mapped[bool] = mapped_column(Boolean, default=False)
    show_email: Mapped[bool] = mapped_column(Boolean, default=False)
    show_phone: Mapped[bool] = mapped_column(Boolean, default=False)