import enum
import uuid
from datetime import datetime

from sqlalchemy import DateTime, Enum, String, Text, func
from sqlalchemy.orm import Mapped, mapped_column

from .db import Base


class TaskStatus(str, enum.Enum):
    pending = "pending"
    in_progress = "in_progress"
    completed = "completed"


class Task(Base):
    __tablename__ = "tasks"

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=lambda: str(uuid.uuid4()))
    title: Mapped[str] = mapped_column(String(200), nullable=False, index=True)
    description: Mapped[str | None] = mapped_column(Text, nullable=True)
    status: Mapped[TaskStatus] = mapped_column(Enum(TaskStatus, name="task_status"), nullable=False, default=TaskStatus.pending)
    due_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now(), nullable=False)
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now(), nullable=False)