import time

from sqlalchemy import JSON, Boolean, Column, ForeignKey, Integer, String
from sqlalchemy.orm import relationship

from orm.author import Author
from orm.topic import Topic
from services.db import Base
from orm.shout import Shout


class DraftTopic(Base):
    __tablename__ = "draft_topic"

    id = None  # type: ignore
    shout = Column(ForeignKey("draft.id"), primary_key=True, index=True)
    topic = Column(ForeignKey("topic.id"), primary_key=True, index=True)
    main = Column(Boolean, nullable=True)


class DraftAuthor(Base):
    __tablename__ = "draft_author"

    id = None  # type: ignore
    shout = Column(ForeignKey("draft.id"), primary_key=True, index=True)
    author = Column(ForeignKey("author.id"), primary_key=True, index=True)
    caption = Column(String, nullable=True, default="")



class Draft(Base):
    __tablename__ = "draft"
    # required
    created_at: int = Column(Integer, nullable=False, default=lambda: int(time.time()))
    # Колонки для связей с автором
    created_by: int = Column("created_by", ForeignKey("author.id"), nullable=False)
    community: int = Column("community", ForeignKey("community.id"), nullable=False, default=1)

    # optional
    layout: str = Column(String, nullable=True, default="article")
    slug: str = Column(String, unique=True)
    title: str = Column(String, nullable=True)
    subtitle: str | None = Column(String, nullable=True)
    lead: str | None = Column(String, nullable=True)
    body: str = Column(String, nullable=False, comment="Body")
    media: dict | None = Column(JSON, nullable=True)
    cover: str | None = Column(String, nullable=True, comment="Cover image url")
    cover_caption: str | None = Column(String, nullable=True, comment="Cover image alt caption")
    lang: str = Column(String, nullable=False, default="ru", comment="Language")
    seo: str | None = Column(String, nullable=True)  # JSON

    # auto
    updated_at: int | None = Column(Integer, nullable=True, index=True)
    deleted_at: int | None = Column(Integer, nullable=True, index=True)
    updated_by: int | None = Column("updated_by", ForeignKey("author.id"), nullable=True)
    deleted_by: int | None = Column("deleted_by", ForeignKey("author.id"), nullable=True)
    
    # --- Relationships --- 
    # Только many-to-many связи через вспомогательные таблицы
    authors = relationship(Author, secondary="draft_author", lazy="select")
    topics = relationship(Topic, secondary="draft_topic", lazy="select")
    
    # Связь с Community (если нужна как объект, а не ID)
    # community = relationship("Community", foreign_keys=[community_id], lazy="joined")
    # Пока оставляем community_id как ID

    # Связь с публикацией (один-к-одному или один-к-нулю)
    # Загружается через joinedload в резолвере
    publication = relationship(
        "Shout", 
        primaryjoin="Draft.id == Shout.draft", 
        foreign_keys="Shout.draft", 
        uselist=False, 
        lazy="noload", # Не грузим по умолчанию, только через options
        viewonly=True # Указываем, что это связь только для чтения
    )

    def dict(self):
        """
        Сериализует объект Draft в словарь.
        Гарантирует, что поля topics и authors всегда будут списками.
        """
        return {
            "id": self.id,
            "created_at": self.created_at,
            "created_by": self.created_by,
            "community": self.community,
            "layout": self.layout,
            "slug": self.slug,
            "title": self.title,
            "subtitle": self.subtitle,
            "lead": self.lead,
            "body": self.body,
            "media": self.media or [],
            "cover": self.cover,
            "cover_caption": self.cover_caption,
            "lang": self.lang,
            "seo": self.seo,
            "updated_at": self.updated_at,
            "deleted_at": self.deleted_at,
            "updated_by": self.updated_by,
            "deleted_by": self.deleted_by,
            # Гарантируем, что topics и authors всегда будут списками
            "topics": [topic.dict() for topic in (self.topics or [])],
            "authors": [author.dict() for author in (self.authors or [])]
        }