"""Feed model."""
from datetime import datetime, timezone

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

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


class Feed(Base, UUIDMixin, TimestampMixin):
    """RSS feed source."""

    __tablename__ = "feeds"

    url: Mapped[str] = mapped_column(String(2048), unique=True, nullable=False, index=True)
    title: Mapped[str | None] = mapped_column(String(512), default="")
    description: Mapped[str | None] = mapped_column(Text, default="")
    category: Mapped[str | None] = mapped_column(String(128), default="")
    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False, index=True)
    fetch_interval_minutes: Mapped[int] = mapped_column(Integer, default=60, nullable=False)
    priority: Mapped[int] = mapped_column(Integer, default=5, nullable=False)
    parser_config: Mapped[dict] = mapped_column(JSON, default=dict, nullable=False)
    proxy_policy: Mapped[str] = mapped_column(String(32), default="auto", nullable=False)

    # Fetch statistics
    last_fetch_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    last_fetch_status: Mapped[str | None] = mapped_column(String(32), default="")
    last_error: Mapped[str | None] = mapped_column(Text, default="")
    error_type: Mapped[str | None] = mapped_column(String(64), default="")
    success_count: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
    fail_count: Mapped[int] = mapped_column(Integer, default=0, nullable=False)
    article_count: Mapped[int] = mapped_column(Integer, default=0, nullable=False)

    raw_articles: Mapped[list["RawArticle"]] = relationship(
        "RawArticle", back_populates="feed", cascade="all, delete-orphan"
    )

    def health_status(self, now: datetime | None = None) -> str:
        """Compute feed health status."""
        if now is None:
            now = datetime.now(timezone.utc)

        total = self.success_count + self.fail_count
        if total == 0:
            return "unknown"

        success_rate = self.success_count / total
        days_since = None
        if self.last_fetch_at:
            days_since = (now - self.last_fetch_at).days

        if success_rate >= 0.9 and (days_since is None or days_since <= 7):
            return "healthy"
        if success_rate >= 0.5 and (days_since is None or days_since <= 7):
            return "warning"
        return "unhealthy"

    def __repr__(self) -> str:
        return f"<Feed {self.title or self.url}>"