from datetime import datetime

from sqlalchemy import Boolean, DateTime, Float, ForeignKey, Integer, String, Text
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.db.base_class import Base


class Author(Base):
    """Author model for manga creators."""

    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
    name: Mapped[str] = mapped_column(String(100), nullable=False, index=True)
    biography: Mapped[str | None] = mapped_column(Text, nullable=True)

    # Relationship with Manga
    manga_list = relationship("Manga", back_populates="author")

    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, nullable=False)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False
    )


class Publisher(Base):
    """Publisher model for manga books."""

    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
    name: Mapped[str] = mapped_column(String(100), nullable=False, index=True)
    website: Mapped[str | None] = mapped_column(String(255), nullable=True)
    country: Mapped[str | None] = mapped_column(String(50), nullable=True)

    # Relationship with Manga
    manga_list = relationship("Manga", back_populates="publisher")

    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, nullable=False)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False
    )


class Genre(Base):
    """Genre model for manga classification."""

    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
    name: Mapped[str] = mapped_column(String(50), nullable=False, index=True, unique=True)
    description: Mapped[str | None] = mapped_column(Text, nullable=True)

    # Relationship with Manga
    manga_list = relationship("MangaGenre", back_populates="genre")

    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, nullable=False)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False
    )


class Manga(Base):
    """Manga model representing a manga book in inventory."""

    id: Mapped[int] = mapped_column(Integer, primary_key=True, index=True)
    title: Mapped[str] = mapped_column(String(255), nullable=False, index=True)
    original_title: Mapped[str | None] = mapped_column(String(255), nullable=True)
    isbn: Mapped[str | None] = mapped_column(String(20), nullable=True, index=True, unique=True)
    description: Mapped[str | None] = mapped_column(Text, nullable=True)

    # Volume information
    volume_number: Mapped[int | None] = mapped_column(Integer, nullable=True)
    total_volumes: Mapped[int | None] = mapped_column(Integer, nullable=True)

    # Foreign keys
    author_id: Mapped[int | None] = mapped_column(Integer, ForeignKey("author.id"), nullable=True)
    publisher_id: Mapped[int | None] = mapped_column(
        Integer, ForeignKey("publisher.id"), nullable=True
    )

    # Relationships
    author = relationship("Author", back_populates="manga_list")
    publisher = relationship("Publisher", back_populates="manga_list")
    genres = relationship("MangaGenre", back_populates="manga")

    # Publication information
    publication_date: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)

    # Physical attributes
    page_count: Mapped[int | None] = mapped_column(Integer, nullable=True)

    # Inventory information
    price: Mapped[float | None] = mapped_column(Float, nullable=True)
    quantity: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
    in_stock: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)

    # Ratings and metadata
    rating: Mapped[float | None] = mapped_column(Float, nullable=True)
    language: Mapped[str | None] = mapped_column(String(50), nullable=True)
    cover_image_url: Mapped[str | None] = mapped_column(String(255), nullable=True)

    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, nullable=False)
    updated_at: Mapped[datetime] = mapped_column(
        DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False
    )


class MangaGenre(Base):
    """Junction table for many-to-many relationship between Manga and Genre."""

    manga_id: Mapped[int] = mapped_column(Integer, ForeignKey("manga.id"), primary_key=True)
    genre_id: Mapped[int] = mapped_column(Integer, ForeignKey("genre.id"), primary_key=True)

    # Relationships
    manga = relationship("Manga", back_populates="genres")
    genre = relationship("Genre", back_populates="manga_list")

    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, nullable=False)