import uuid
from datetime import datetime
from sqlalchemy import String, DateTime, ForeignKey, func
from sqlalchemy.orm import Mapped, mapped_column, relationship
from sqlalchemy.dialects.postgresql import UUID
from app.database import Base


class CustomerAssignment(Base):
    __tablename__ = "customer_assignments"

    id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
    customer_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("customers.id"), index=True)
    manager_id: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"))
    role: Mapped[str] = mapped_column(String(20), default="primary")  # 'primary' / 'assistant'
    assigned_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), server_default=func.now())
    assigned_by: Mapped[uuid.UUID] = mapped_column(UUID(as_uuid=True), ForeignKey("users.id"))

    customer: Mapped["Customer"] = relationship("Customer", back_populates="assignments")
    manager: Mapped["User"] = relationship("User", foreign_keys=[manager_id])