"""审批流程模型 — 支持多级、并行、条件审批。"""
from sqlalchemy import Column, Integer, String, Text, Boolean, DateTime, ForeignKey, func
from sqlalchemy.orm import relationship

from app.core.database import Base


class WorkflowDefinition(Base):
    """审批流程定义模板。"""
    __tablename__ = "workflow_definitions"

    id = Column(Integer, primary_key=True, autoincrement=True)
    name = Column(String(100), nullable=False)
    description = Column(Text, nullable=True)
    is_default = Column(Boolean, default=False)
    is_active = Column(Boolean, default=True)
    created_at = Column(DateTime, server_default=func.now())

    steps = relationship("WorkflowStep", back_populates="workflow",
                         order_by="WorkflowStep.step_number",
                         cascade="all, delete-orphan")


class WorkflowStep(Base):
    """审批步骤定义。"""
    __tablename__ = "workflow_steps"

    id = Column(Integer, primary_key=True, autoincrement=True)
    workflow_id = Column(Integer, ForeignKey("workflow_definitions.id"), nullable=False)
    step_number = Column(Integer, nullable=False)
    name = Column(String(100), nullable=False)
    step_type = Column(String(20), nullable=False, default="serial")  # serial / parallel / any_one
    approver_role = Column(String(20), nullable=True)  # admin / dba / manager
    approver_ids = Column(Text, nullable=True)  # JSON list of specific user ids
    is_required = Column(Boolean, default=True)
    timeout_hours = Column(Integer, default=24)
    auto_approve_on_timeout = Column(Boolean, default=False)

    workflow = relationship("WorkflowDefinition", back_populates="steps")


class TicketApproval(Base):
    """工单审批实例（运行时记录）。"""
    __tablename__ = "ticket_approvals"

    id = Column(Integer, primary_key=True, autoincrement=True)
    ticket_id = Column(Integer, ForeignKey("tickets.id"), nullable=False)
    step_number = Column(Integer, nullable=False)
    step_name = Column(String(100), nullable=True)
    approver_id = Column(Integer, ForeignKey("users.id"), nullable=True)
    approver_role = Column(String(20), nullable=True)
    action = Column(String(20), default="pending")  # pending / approved / rejected / transferred / skipped
    comment = Column(Text, nullable=True)
    created_at = Column(DateTime, server_default=func.now())
    updated_at = Column(DateTime, server_default=func.now(), onupdate=func.now())