"""
特例审批模型
"""
from typing import TYPE_CHECKING, Optional
from datetime import datetime
from sqlalchemy import String, Text, Boolean, ForeignKey, DateTime, Enum as SQLEnum
from app.models.types import JSONType
from sqlalchemy.orm import Mapped, mapped_column, relationship
import enum

from app.models.base import Base, TimestampMixin

if TYPE_CHECKING:
    from app.models.tenant import Tenant


class RiskTargetType(str, enum.Enum):
    """特例目标类型"""
    INFLUENCER = "influencer"
    ORDER = "order"
    CONTENT = "content"


class RiskExceptionStatus(str, enum.Enum):
    """特例审批状态"""
    PENDING = "pending"
    APPROVED = "approved"
    REJECTED = "rejected"
    EXPIRED = "expired"
    REVOKED = "revoked"


class RiskException(Base, TimestampMixin):
    """特例审批表"""
    __tablename__ = "risk_exceptions"

    id: Mapped[str] = mapped_column(String(64), primary_key=True)
    tenant_id: Mapped[str] = mapped_column(
        String(64),
        ForeignKey("tenants.id", ondelete="CASCADE"),
        nullable=False,
        index=True,
    )

    # 申请信息
    applicant_id: Mapped[str] = mapped_column(String(64), nullable=False, index=True)
    apply_time: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        nullable=False,
    )

    # 目标信息
    target_type: Mapped[RiskTargetType] = mapped_column(
        SQLEnum(RiskTargetType, name="risk_target_type_enum"),
        nullable=False,
    )
    target_id: Mapped[str] = mapped_column(String(64), nullable=False, index=True)
    risk_rule_id: Mapped[str] = mapped_column(String(64), nullable=False)

    # 状态
    status: Mapped[RiskExceptionStatus] = mapped_column(
        SQLEnum(RiskExceptionStatus, name="risk_exception_status_enum"),
        default=RiskExceptionStatus.PENDING,
        nullable=False,
        index=True,
    )

    # 有效期
    valid_start_time: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        nullable=False,
    )
    valid_end_time: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        nullable=False,
    )

    # 申请原因
    reason_category: Mapped[str] = mapped_column(String(100), nullable=False)
    justification: Mapped[str] = mapped_column(Text, nullable=False)
    attachment_url: Mapped[Optional[str]] = mapped_column(String(2048), nullable=True)

    # 审批信息
    current_approver_id: Mapped[Optional[str]] = mapped_column(String(64), nullable=True)

    # 审批流转日志 (JSON 数组)
    # [{"approver_id": "...", "action": "approve/reject", "comment": "...", "timestamp": "..."}]
    approval_chain_log: Mapped[list] = mapped_column(JSONType, default=list, nullable=False)

    # 驳回信息
    auto_rejected: Mapped[bool] = mapped_column(Boolean, default=False, nullable=False)
    rejection_reason: Mapped[Optional[str]] = mapped_column(Text, nullable=True)

    # 最近状态变更时间
    last_status_at: Mapped[Optional[datetime]] = mapped_column(
        DateTime(timezone=True),
        nullable=True,
    )

    # 关联
    tenant: Mapped["Tenant"] = relationship("Tenant", back_populates="risk_exceptions")

    def __repr__(self) -> str:
        return f"<RiskException(id={self.id}, status={self.status})>"