from __future__ import annotations

import uuid

from sqlalchemy import Boolean, ForeignKey, JSON, String, Text, UniqueConstraint
from sqlalchemy.orm import Mapped, mapped_column

from govoplan_core.db.base import Base, TimestampMixin


def new_uuid() -> str:
    return str(uuid.uuid4())


class GovernanceTemplate(Base, TimestampMixin):
    __tablename__ = "governance_templates"
    __table_args__ = (UniqueConstraint("kind", "slug", name="uq_governance_templates_kind_slug"),)

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_uuid)
    kind: Mapped[str] = mapped_column(String(20), nullable=False, index=True)
    slug: Mapped[str] = mapped_column(String(100), nullable=False)
    name: Mapped[str] = mapped_column(String(255), nullable=False)
    description: Mapped[str | None] = mapped_column(Text)
    permissions: Mapped[list[str]] = mapped_column(JSON, default=list, nullable=False)
    is_active: Mapped[bool] = mapped_column(Boolean, default=True, nullable=False)


class GovernanceTemplateAssignment(Base, TimestampMixin):
    __tablename__ = "governance_template_assignments"
    __table_args__ = (UniqueConstraint("template_id", "tenant_id", name="uq_governance_template_tenant"),)

    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=new_uuid)
    template_id: Mapped[str] = mapped_column(ForeignKey("governance_templates.id", ondelete="CASCADE"), nullable=False, index=True)
    tenant_id: Mapped[str] = mapped_column(ForeignKey("tenants.id", ondelete="CASCADE"), nullable=False, index=True)
    mode: Mapped[str] = mapped_column(String(20), default="available", nullable=False)


__all__ = ["GovernanceTemplate", "GovernanceTemplateAssignment", "new_uuid"]