"""Author RAG Chatbot SaaS — Book Model."""

from __future__ import annotations

from typing import TYPE_CHECKING

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

from app.models.base import Base, TimestampMixin, generate_uuid

if TYPE_CHECKING:
    from app.models.user import User
    from app.models.document import Document
    from app.models.link import Link
    from app.models.platform_listing import BookPlatformListing


class Book(Base, TimestampMixin):
    """A book in an author's catalog."""

    __tablename__ = "books"

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=generate_uuid)
    author_id: Mapped[str] = mapped_column(
        String(36), ForeignKey("users.id", ondelete="CASCADE"), nullable=False, index=True
    )

    # Metadata
    title: Mapped[str] = mapped_column(String(500), nullable=False)
    tagline: Mapped[str | None] = mapped_column(String(500), nullable=True)
    genre: Mapped[str | None] = mapped_column(String(300), nullable=True)   # widened for long category strings
    description: Mapped[str | None] = mapped_column(Text, nullable=True)
    cover_path: Mapped[str | None] = mapped_column(String(500), nullable=True)       # local file path
    cover_url: Mapped[str | None] = mapped_column(String(1000), nullable=True)       # remote CDN URL (scraped)
    cover_thumbnail_path: Mapped[str | None] = mapped_column(String(500), nullable=True)
    cover_medium_path: Mapped[str | None] = mapped_column(String(500), nullable=True)
    ai_summary: Mapped[str | None] = mapped_column(Text, nullable=True)
    publish_year: Mapped[str | None] = mapped_column(String(4), nullable=True)

    # Processing
    status: Mapped[str] = mapped_column(String(50), default="created", nullable=False, index=True)
    error_message: Mapped[str | None] = mapped_column(Text, nullable=True)
    chroma_collection_id: Mapped[str | None] = mapped_column(String(100), nullable=True)
    chunk_count: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
    page_count: Mapped[int] = mapped_column(Integer, default=0, nullable=False)

    # Display
    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)
    display_order: Mapped[int] = mapped_column(Integer, default=0, nullable=False)

    # Smart links
    buy_url: Mapped[str | None] = mapped_column(String(1000), nullable=True)
    preview_url: Mapped[str | None] = mapped_column(String(1000), nullable=True)

    # Import tracking
    source_url:   Mapped[str | None] = mapped_column(String(1000), nullable=True)
    isbn:         Mapped[str | None] = mapped_column(String(20),   nullable=True)
    book_author:  Mapped[str | None] = mapped_column(String(200),  nullable=True)
    about_author: Mapped[str | None] = mapped_column(Text,         nullable=True)
    language:     Mapped[str | None] = mapped_column(String(50),   nullable=True)
    rating:       Mapped[str | None] = mapped_column(String(10),   nullable=True)
    rating_count: Mapped[str | None] = mapped_column(String(20),   nullable=True)

    # Relationships
    author:    Mapped[User]           = relationship("User",     back_populates="books")
    documents: Mapped[list[Document]] = relationship("Document", back_populates="book", cascade="all, delete-orphan")
    links:     Mapped[list[Link]]     = relationship("Link",     back_populates="book", cascade="all, delete-orphan")
    platform_listings: Mapped[list["BookPlatformListing"]] = relationship(
        "BookPlatformListing", back_populates="book", cascade="all, delete-orphan"
    )

    def __repr__(self) -> str:
        return f"<Book id={self.id} title={self.title!r}>"