import enum
import uuid
from datetime import date

from sqlalchemy import Date, Enum, ForeignKey, String, Text
from sqlalchemy.dialects.postgresql import UUID
from sqlalchemy.orm import Mapped, mapped_column, relationship

from api.models.base import Base, TimestampMixin, new_uuid


class WorkstreamStatus(str, enum.Enum):
    active = "active"
    blocked = "blocked"
    completed = "completed"
    archived = "archived"


class Workstream(Base, TimestampMixin):
    __tablename__ = "workstreams"

    id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), primary_key=True, default=new_uuid
    )
    topic_id: Mapped[uuid.UUID] = mapped_column(
        UUID(as_uuid=True), ForeignKey("topics.id", ondelete="RESTRICT"), nullable=False, index=True
    )
    slug: Mapped[str] = mapped_column(String(100), unique=True, nullable=False, index=True)
    title: Mapped[str] = mapped_column(String(255), nullable=False)
    description: Mapped[str | None] = mapped_column(Text, nullable=True)
    status: Mapped[WorkstreamStatus] = mapped_column(
        Enum(WorkstreamStatus), nullable=False, default=WorkstreamStatus.active
    )
    owner: Mapped[str | None] = mapped_column(String(100), nullable=True)
    due_date: Mapped[date | None] = mapped_column(Date, nullable=True)

    topic: Mapped["Topic"] = relationship("Topic", back_populates="workstreams")  # noqa: F821
    tasks: Mapped[list["Task"]] = relationship(  # noqa: F821
        "Task", back_populates="workstream", lazy="selectin"
    )
    decisions: Mapped[list["Decision"]] = relationship(  # noqa: F821
        "Decision", back_populates="workstream", lazy="selectin"
    )
    progress_events: Mapped[list["ProgressEvent"]] = relationship(  # noqa: F821
        "ProgressEvent", back_populates="workstream", lazy="selectin"
    )