import uuid
from datetime import datetime
from sqlalchemy import String, Text, DateTime, ForeignKey
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column, relationship
from app.core.database import Base
from app.models.base import UUIDMixin


class GenerationTask(Base, UUIDMixin):
    __tablename__ = "generation_tasks"

    template_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), ForeignKey("templates.id", ondelete="CASCADE"), nullable=False, index=True
    )
    status: Mapped[str] = mapped_column(String(20), nullable=False, default="pending")
    result_file_path: Mapped[str | None] = mapped_column(String(500), nullable=True)
    error_msg: Mapped[str | None] = mapped_column(Text, nullable=True)
    celery_task_id: Mapped[str | None] = mapped_column(String(100), nullable=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True))
    finished_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True), nullable=True)

    template = relationship("Template")