import uuid
from datetime import datetime
from sqlalchemy import String, Text, DateTime, ForeignKey, Table, Column, Integer, Boolean, Enum as SAEnum
from sqlalchemy.orm import mapped_column, Mapped, relationship
from sqlalchemy.dialects.postgresql import UUID
import enum
from .database import Base


class ArticleStatus(str, enum.Enum):
    draft = "draft"
    published = "published"


article_tag = Table(
    "article_tag",
    Base.metadata,
    Column("article_id", UUID(as_uuid=True), ForeignKey("articles.id", ondelete="CASCADE")),
    Column("tag_id", UUID(as_uuid=True), ForeignKey("tags.id", ondelete="CASCADE")),
)


class Category(Base):
    __tablename__ = "categories"
    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    name: Mapped[str] = mapped_column(String(100), unique=True)
    slug: Mapped[str] = mapped_column(String(100), unique=True, index=True)
    articles: Mapped[list["Article"]] = relationship(back_populates="category", lazy="noload")


class Tag(Base):
    __tablename__ = "tags"
    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    name: Mapped[str] = mapped_column(String(100), unique=True)
    slug: Mapped[str] = mapped_column(String(100), unique=True, index=True)


class Article(Base):
    __tablename__ = "articles"
    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    title: Mapped[str] = mapped_column(String(500))
    slug: Mapped[str] = mapped_column(String(500), unique=True, index=True)
    content: Mapped[str] = mapped_column(Text, default="")
    excerpt: Mapped[str] = mapped_column(String(1000), default="")
    cover_url: Mapped[str | None] = mapped_column(String(1000), nullable=True)
    font_family: Mapped[str] = mapped_column(String(100), default="Merriweather")
    source_url: Mapped[str | None] = mapped_column(String(1000), nullable=True)
    status: Mapped[ArticleStatus] = mapped_column(SAEnum(ArticleStatus), default=ArticleStatus.draft)
    view_count: Mapped[int] = mapped_column(Integer, default=0)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
    updated_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
    published_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
    category_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True), ForeignKey("categories.id", ondelete="SET NULL"), nullable=True
    )
    category: Mapped["Category | None"] = relationship(back_populates="articles", lazy="selectin")
    tags: Mapped[list["Tag"]] = relationship(secondary=article_tag, lazy="selectin")


class Admin(Base):
    __tablename__ = "admins"
    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    username: Mapped[str] = mapped_column(String(100), unique=True)
    password_hash: Mapped[str] = mapped_column(String(300))


class Media(Base):
    __tablename__ = "media"
    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    filename: Mapped[str] = mapped_column(String(500))
    url: Mapped[str] = mapped_column(String(1000))
    media_type: Mapped[str] = mapped_column(String(20))  # image | video
    size_bytes: Mapped[int] = mapped_column(Integer, default=0)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)
    article_id: Mapped[uuid.UUID | None] = mapped_column(
        UUID(as_uuid=True), ForeignKey("articles.id", ondelete="SET NULL"), nullable=True
    )


class VkSource(Base):
    __tablename__ = "vk_sources"
    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    group_id: Mapped[str] = mapped_column(String(50), unique=True)   # числовой ID без минуса
    group_name: Mapped[str] = mapped_column(String(200))              # станет названием категории
    enabled: Mapped[bool] = mapped_column(Boolean, default=True)
    last_run: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow)