"""月度结算与调整单模型（M3 ④：月结审批报表补充需求）。

- 月度结算按「确认回款」和计算快照生成；**通过即锁定**（status=3 已审定
  即终态，锁定后源数据改动只产生提示与后续调整）
- settlement_items 明细按人固化（可负=负数工资），锁定后无 UPDATE 路径
  （重生成 = 草稿/驳回态删旧插新）
- 调整单是已锁定月份的唯一调整通道（补发/扣减，走审批；生效后不回写
  已锁定月结——append-only，报表汇总并入）
"""

from datetime import datetime
from decimal import Decimal

from sqlalchemy import JSON, DateTime, ForeignKey, Numeric, String
from sqlalchemy.orm import Mapped, mapped_column

from app.models.base import BIGINT_UNSIGNED, TINYINT_TYPE, Base, TimestampMixin, mysql_table_args

# 月结状态（monthly_settlements.status；通过即锁定——两态合一）
SETTLEMENT_STATUS_DRAFT = 1  # 草稿（可重新生成/提交）
SETTLEMENT_STATUS_PENDING = 2  # 待审批（提交后）
SETTLEMENT_STATUS_APPROVED = 3  # 已审定（终态=已锁定）
SETTLEMENT_STATUS_REJECTED = 4  # 已驳回（回草稿可重提）

# 调整单状态（adjustment_orders.status）
ADJUSTMENT_STATUS_PENDING = 1  # 待审批
ADJUSTMENT_STATUS_EFFECTIVE = 2  # 已生效
ADJUSTMENT_STATUS_REJECTED = 3  # 已驳回
ADJUSTMENT_STATUS_WITHDRAWN = 4  # 已撤回

# 调整方向（adjustment_orders.direction）
ADJUSTMENT_DIRECTION_EXTRA = 1  # 补发
ADJUSTMENT_DIRECTION_DEDUCT = 2  # 扣减


class MonthlySettlement(Base, TimestampMixin):
    """月度结算表：按月一行（settlement_month 唯一），快照 + 审批 + 锁定。"""

    __tablename__ = "monthly_settlements"
    __table_args__ = mysql_table_args("月度结算表（按月一行；通过即锁定，锁定后走调整单）")

    id: Mapped[int] = mapped_column(
        BIGINT_UNSIGNED, primary_key=True, autoincrement=True, comment="主键ID"
    )
    settlement_month: Mapped[str] = mapped_column(
        String(7), nullable=False, unique=True, comment="结算月份（YYYY-MM；全表唯一）"
    )
    status: Mapped[int] = mapped_column(
        TINYINT_TYPE,
        nullable=False,
        server_default="1",
        comment="状态：1草稿 2待审批 3已审定（终态=已锁定）4已驳回（回草稿）",
    )
    total_performance: Mapped[Decimal | None] = mapped_column(
        Numeric(14, 2), comment="绩效金额合计（可负）"
    )
    total_payable: Mapped[Decimal | None] = mapped_column(
        Numeric(14, 2), comment="应付绩效合计（可负）"
    )
    person_count: Mapped[int] = mapped_column(
        TINYINT_TYPE, nullable=False, server_default="0", comment="结算人数"
    )
    snapshot_json: Mapped[dict | None] = mapped_column(
        JSON, comment="月度总览快照（生成时刻的确认回款口径说明与汇总参数）"
    )
    approval_order_no: Mapped[str | None] = mapped_column(
        String(32), comment="关联审批单号（冗余固化；开关关闭自动通过时也有单）"
    )
    submitter_id: Mapped[int | None] = mapped_column(
        BIGINT_UNSIGNED,
        ForeignKey("users.id", ondelete="SET NULL"),
        comment="提交人ID（账号删除后置空）",
    )
    submitter_name: Mapped[str] = mapped_column(
        String(64), nullable=False, comment="提交人用户名（冗余固化）"
    )
    locked_at: Mapped[datetime | None] = mapped_column(
        DateTime, comment="锁定时间（status=3 时回填）"
    )
    locked_by: Mapped[str | None] = mapped_column(String(64), comment="锁定操作人（冗余固化）")

    @property
    def approval_required(self) -> bool:
        return bool((self.snapshot_json or {}).get("approval_required", True))


class SettlementItem(Base):
    """月结明细表：按人按核算类型固化金额（锁定后只读；重生成=草稿态删旧插新）。"""

    __tablename__ = "settlement_items"
    __table_args__ = mysql_table_args(
        "月结明细表（按人固化；支持负数工资；锁定后只读）",
    )

    id: Mapped[int] = mapped_column(
        BIGINT_UNSIGNED, primary_key=True, autoincrement=True, comment="主键ID"
    )
    settlement_id: Mapped[int] = mapped_column(
        BIGINT_UNSIGNED,
        ForeignKey("monthly_settlements.id", ondelete="CASCADE"),
        nullable=False,
        comment="月结ID（monthly_settlements.id；头删明细随删）",
    )
    personnel_id: Mapped[int] = mapped_column(
        BIGINT_UNSIGNED,
        ForeignKey("personnel.id", ondelete="RESTRICT"),
        nullable=False,
        comment="结算人员ID（personnel.id）",
    )
    personnel_name: Mapped[str] = mapped_column(
        String(64), nullable=False, comment="结算人员姓名（冗余固化）"
    )
    role_code: Mapped[str] = mapped_column(
        String(32), nullable=False, comment="岗位编码（主岗，聚合锚点）"
    )
    calc_type: Mapped[int] = mapped_column(
        TINYINT_TYPE, nullable=False, comment="核算类型：1单笔回款 2经理团队聚合"
    )
    performance_sum: Mapped[Decimal] = mapped_column(
        Numeric(14, 2),
        nullable=False,
        comment="绩效金额合计（可负；聚合行排除经理个人户业绩，#12 暂口径）",
    )
    payable_sum: Mapped[Decimal] = mapped_column(
        Numeric(14, 2), nullable=False, comment="应付绩效合计（可负）"
    )
    basic_amount: Mapped[Decimal | None] = mapped_column(
        Numeric(14, 2), comment="月工资标准（personnel.salary_standard 当月快照）"
    )
    salary_mode: Mapped[str | None] = mapped_column(
        String(16), comment="月工资口径快照：INCLUDE/DEDUCT/EXCLUDE"
    )
    net_amount: Mapped[Decimal | None] = mapped_column(
        Numeric(14, 2),
        comment="净工资 = 绩效±基本工资（按口径；试用期为基本工资+正常应付+年度差额，缓发部分不发）"
    )
    is_probation: Mapped[int] = mapped_column(
        TINYINT_TYPE,
        nullable=False,
        server_default="0",
        comment="试用期：1缓发绩效不发（基本工资正常发，超年累计记 note）0否",
    )
    probation_note: Mapped[str | None] = mapped_column(
        String(255), comment="试用期说明（年累计超阈值部分年底一次性结算）"
    )
    normal_payable_sum: Mapped[Decimal] = mapped_column(
        Numeric(14, 2), nullable=False, server_default="0", comment="当月正常实付绩效"
    )
    deferred_sum: Mapped[Decimal] = mapped_column(
        Numeric(14, 2), nullable=False, server_default="0", comment="当月试用期缓发变化"
    )
    probation_payment_sum: Mapped[Decimal] = mapped_column(
        Numeric(14, 2), nullable=False, server_default="0", comment="本月年度补发或扣回"
    )
    snapshot_json: Mapped[dict | None] = mapped_column(
        JSON, comment="个人明细快照（台账行引用列表）"
    )


class AdjustmentOrder(Base, TimestampMixin):
    """调整单：已锁定月份的唯一调整通道（补发/扣减，走审批；不回写月结）。"""

    __tablename__ = "adjustment_orders"
    __table_args__ = mysql_table_args(
        "调整单表（已锁定月份的补发/扣减；走审批；生效后不回写月结快照）",
    )

    id: Mapped[int] = mapped_column(
        BIGINT_UNSIGNED, primary_key=True, autoincrement=True, comment="主键ID"
    )
    adjustment_type: Mapped[str] = mapped_column(String(32), nullable=False, server_default="'GENERAL'", comment="调整类型：GENERAL普通 ALLOCATION分配差额")
    source_ledger_id: Mapped[int | None] = mapped_column(BIGINT_UNSIGNED, comment="分配差额对应的原台账ID")
    attribution_json: Mapped[dict | None] = mapped_column(JSON, comment="原台账业务与分管归属快照")
    order_no: Mapped[str] = mapped_column(
        String(32),
        nullable=False,
        unique=True,
        comment="调整单号，自动生成 TZ{YYYYMMDD}-{4位当日序号}",
    )
    settlement_month: Mapped[str] = mapped_column(
        String(7), nullable=False, comment="调整月份（YYYY-MM；跨月规则待澄清 #9 前不限制）"
    )
    personnel_id: Mapped[int] = mapped_column(
        BIGINT_UNSIGNED,
        ForeignKey("personnel.id", ondelete="RESTRICT"),
        nullable=False,
        comment="调整人员ID（personnel.id）",
    )
    personnel_name: Mapped[str] = mapped_column(
        String(64), nullable=False, comment="调整人员姓名（冗余固化）"
    )
    direction: Mapped[int] = mapped_column(
        TINYINT_TYPE, nullable=False, comment="方向：1补发 2扣减"
    )
    amount: Mapped[Decimal] = mapped_column(
        Numeric(14, 2), nullable=False, comment="调整金额（恒正，方向表达语义）"
    )
    reason: Mapped[str] = mapped_column(
        String(255), nullable=False, comment="扣补说明（必填，审批与追溯锚点）"
    )
    status: Mapped[int] = mapped_column(
        TINYINT_TYPE,
        nullable=False,
        server_default="1",
        comment="状态：1待审批 2已生效 3已驳回 4已撤回",
    )
    submitter_id: Mapped[int | None] = mapped_column(
        BIGINT_UNSIGNED,
        ForeignKey("users.id", ondelete="SET NULL"),
        comment="提交人ID（账号删除后置空）",
    )
    submitter_name: Mapped[str] = mapped_column(
        String(64), nullable=False, comment="提交人用户名（冗余固化）"
    )