from sqlalchemy import BigInteger, ForeignKey, Integer, SmallInteger, String
from sqlalchemy.orm import Mapped, mapped_column, relationship

from app.models.base import BaseModel, SoftDeleteMixin


class WorkflowDef(BaseModel, SoftDeleteMixin):
    __tablename__ = "bx_workflow_def"

    biz_type: Mapped[str] = mapped_column(String(32), nullable=False)
    wf_name: Mapped[str] = mapped_column(String(128), nullable=False)
    status: Mapped[int] = mapped_column(SmallInteger, nullable=False, default=1, server_default="1")
    remark: Mapped[str | None] = mapped_column(String(512))

    nodes: Mapped[list["WorkflowNode"]] = relationship(back_populates="workflow_def")


class WorkflowNode(BaseModel):
    __tablename__ = "bx_workflow_node"

    wf_id: Mapped[int] = mapped_column(BigInteger, ForeignKey("bx_workflow_def.id"), nullable=False)
    node_name: Mapped[str] = mapped_column(String(128), nullable=False)
    node_order: Mapped[int] = mapped_column(Integer, nullable=False, default=0, server_default="0")
    approver_id: Mapped[int | None] = mapped_column(BigInteger)
    approver_name: Mapped[str | None] = mapped_column(String(64))

    workflow_def: Mapped["WorkflowDef"] = relationship(back_populates="nodes")