import uuid
from datetime import datetime

from sqlalchemy import String, Integer, Text, DateTime, ForeignKey, Uuid, func
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.database import Base


class Mandate(Base):
    __tablename__ = "mandates"

    id: Mapped[uuid.UUID] = mapped_column(Uuid, primary_key=True, default=uuid.uuid4)
    title: Mapped[str] = mapped_column(String(256), nullable=False)
    description: Mapped[str | None] = mapped_column(Text)
    mandate_type: Mapped[str] = mapped_column(String(64), nullable=False)  # techcomm, smith, custom
    status: Mapped[str] = mapped_column(String(32), default="draft")  # draft, candidacy, voting, active, reporting, completed, revoked
    mandatee_id: Mapped[uuid.UUID | None] = mapped_column(ForeignKey("duniter_identities.id"))
    decision_id: Mapped[uuid.UUID | None] = mapped_column(ForeignKey("decisions.id"))
    starts_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    ends_at: Mapped[datetime | None] = mapped_column(DateTime(timezone=True))
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())

    steps: Mapped[list["MandateStep"]] = relationship(back_populates="mandate", cascade="all, delete-orphan", order_by="MandateStep.step_order")


class MandateStep(Base):
    __tablename__ = "mandate_steps"

    id: Mapped[uuid.UUID] = mapped_column(Uuid, primary_key=True, default=uuid.uuid4)
    mandate_id: Mapped[uuid.UUID] = mapped_column(ForeignKey("mandates.id"), nullable=False)
    step_order: Mapped[int] = mapped_column(Integer, nullable=False)
    step_type: Mapped[str] = mapped_column(String(32), nullable=False)  # formulation, candidacy, vote, assignment, reporting, completion, revocation
    title: Mapped[str | None] = mapped_column(String(256))
    description: Mapped[str | None] = mapped_column(Text)
    status: Mapped[str] = mapped_column(String(32), default="pending")  # pending, active, completed, skipped
    vote_session_id: Mapped[uuid.UUID | None] = mapped_column(ForeignKey("vote_sessions.id"))
    outcome: Mapped[str | None] = mapped_column(Text)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())

    mandate: Mapped["Mandate"] = relationship(back_populates="steps")