import uuid
from datetime import datetime

from sqlalchemy import Boolean, DateTime, Enum as SAEnum, ForeignKey, Index, UniqueConstraint, func
from sqlalchemy.orm import Mapped, mapped_column

from app.core.database import Base
from app.models.types import GUID, MembershipRole


class TenantMembership(Base):
    """عضویت کاربر در یک tenant — tenant_id فقط UUID مرجع Core است (بدون FK بین DB)."""

    __tablename__ = "tenant_memberships"

    id: Mapped[uuid.UUID] = mapped_column(GUID(), primary_key=True, default=uuid.uuid4)
    tenant_id: Mapped[uuid.UUID] = mapped_column(GUID(), nullable=False)
    user_id: Mapped[uuid.UUID] = mapped_column(
        GUID(), ForeignKey("user_profiles.id", ondelete="CASCADE"), nullable=False
    )
    role: Mapped[MembershipRole] = mapped_column(
        SAEnum(
            MembershipRole,
            name="membership_role",
            values_callable=lambda enum_cls: [item.value for item in enum_cls],
        ),
        default=MembershipRole.TENANT_MEMBER,
    )
    is_active: Mapped[bool] = mapped_column(Boolean, default=True)
    joined_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True), server_default=func.now()
    )

    __table_args__ = (
        UniqueConstraint("tenant_id", "user_id", name="uq_tenant_membership"),
        Index("ix_tenant_memberships_tenant_id", "tenant_id"),
        Index("ix_tenant_memberships_user_id", "user_id"),
    )