import enum
from datetime import date, datetime, timezone

from sqlalchemy import Date, DateTime, ForeignKey, Index, Integer, Text
from sqlalchemy.dialects.postgresql import ARRAY
from sqlalchemy.orm import Mapped, mapped_column

from fabledassistant.models import Base


class TaskStatus(str, enum.Enum):
    todo = "todo"
    in_progress = "in_progress"
    done = "done"


class TaskPriority(str, enum.Enum):
    none = "none"
    low = "low"
    medium = "medium"
    high = "high"


class Note(Base):
    __tablename__ = "notes"

    id: Mapped[int] = mapped_column(primary_key=True)
    user_id: Mapped[int | None] = mapped_column(
        Integer, ForeignKey("users.id", ondelete="CASCADE"), nullable=True
    )
    title: Mapped[str] = mapped_column(Text, default="")
    body: Mapped[str] = mapped_column(Text, default="")
    tags: Mapped[list[str]] = mapped_column(ARRAY(Text), default=list)
    parent_id: Mapped[int | None] = mapped_column(
        nullable=True
    )
    status: Mapped[str | None] = mapped_column(Text, nullable=True)
    priority: Mapped[str | None] = mapped_column(Text, nullable=True)
    due_date: Mapped[date | None] = mapped_column(Date, nullable=True)
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), default=lambda: datetime.now(timezone.utc)
    )
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        default=lambda: datetime.now(timezone.utc),
        onupdate=lambda: datetime.now(timezone.utc),
    )

    __table_args__ = (
        Index("ix_notes_tags", "tags", postgresql_using="gin"),
        Index("ix_notes_status", "status"),
        Index("ix_notes_title", "title"),
        Index("ix_notes_user_id", "user_id"),
    )

    @property
    def is_task(self) -> bool:
        return self.status is not None

    def to_dict(self) -> dict:
        return {
            "id": self.id,
            "title": self.title,
            "body": self.body,
            "tags": self.tags or [],
            "parent_id": self.parent_id,
            "status": self.status,
            "priority": self.priority,
            "due_date": self.due_date.isoformat() if self.due_date else None,
            "is_task": self.is_task,
            "created_at": self.created_at.isoformat(),
            "updated_at": self.updated_at.isoformat(),
        }