#!/usr/bin/env python3
"""播种应收账龄逾期预警规则（`alert_rules.rule_type='ar_overdue'`）— 阶段B 专用

用法：
    # 只打印将写入的行（默认 dry-run，阶段A 唯一允许的形式）
    python3 backend/scripts/seed_ar_overdue_rule.py --entity-id 1

    # 真正写库（阶段B，须另铸门/执行件授权）
    python3 backend/scripts/seed_ar_overdue_rule.py --entity-id 1 --apply

    # 把参数 JSON 打到 stdout/文件，供阶段A `POST /run-ar-overdue` 的 dry-run body 复演
    python3 backend/scripts/seed_ar_overdue_rule.py --entity-id 1 --emit-params /tmp/ar_params.json

阈值与责任人**只存在于本脚本**（业务数字唯一定义处）；运行期一律读 DB 行，
代码侧不含任何阈值常量（任务硬约束 §3.4）。
"""
from __future__ import annotations

import argparse
import json
import os
import sys

sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

from dotenv import load_dotenv  # noqa: E402

load_dotenv(os.path.join(os.path.dirname(os.path.dirname(os.path.abspath(__file__))), ".env"))

from app.database import get_session_local  # noqa: E402
from app.models import KPIDefinition  # noqa: E402
from app.utils import ar_caliber  # noqa: E402

RULE_TYPE = "ar_overdue"
DEFAULT_KPI_CODE = "F_AR_002"  # 逾期应收账款率（财务口径）；库内暂缺时须由财务定绑定

# ── 业务数字唯一定义处（阶段B 放行后如需调阈值：改这里或直接改 DB 行）──
DEFAULT_PARAMS = {
    "kpi_code": DEFAULT_KPI_CODE,
    "caliber": ar_caliber.CALIBER_DEBIT,
    "red": {
        # 2026-10-20 财务裁决：90 天占比红线停用（10 期 10/10 恒红、无区分度）→ 键位保留、置 null
        "share_90plus_gt": None,
        "single_overdue_amt_gt": 50000,
        "single_overdue_min_days": 30,
        "count_mom_pct_gte": 0.20,
        # 150+ 档占比环比上升 = 结构恶化（新增红线 2）
        "structure_worsen": True,
    },
    "yellow": {
        "share_90plus_min": 0.15,
        "share_90plus_max": 0.25,
        "single_overdue_amt_min": 10000,
        "single_overdue_amt_max": 50000,
    },
    # 责任人：逐户派生「近 3 个月主业务员 → 部门负责人」，两路皆失败则该户不生成（skipped[]）
    "assignee_source": {
        "mode": "salesman_then_dept",
        "lookback_months": 3,
        "dept_fallback": {"渠道": 118, "商务": 114, "直属酒窖": 117},
    },
    "assignee_by_unit": {},
    "exclude_unit_codes": [],
    "action_texts": {"red": "催收+停供评估", "yellow": "对账+催收"},
}


def resolve_kpi(db, entity_id: int, kpi_code: str, kpi_id: int | None):
    if kpi_id:
        return db.query(KPIDefinition).filter(
            KPIDefinition.id == kpi_id, KPIDefinition.entity_id == entity_id).first()
    return db.query(KPIDefinition).filter(
        KPIDefinition.kpi_code == kpi_code, KPIDefinition.entity_id == entity_id).first()


def main() -> int:
    ap = argparse.ArgumentParser(description="播种 ar_overdue 预警规则")
    ap.add_argument("--entity-id", type=int, required=True)
    ap.add_argument("--kpi-code", default=DEFAULT_KPI_CODE)
    ap.add_argument("--kpi-id", type=int, default=None, help="显式绑定 KPI（优先于 kpi-code）")
    ap.add_argument("--assignee", default=None, help="覆盖 assignee_default（财务指定责任人）")
    ap.add_argument("--apply", action="store_true", help="真正写库（阶段B 才允许）")
    ap.add_argument("--emit-params", default=None, help="把最终 params JSON 写入指定文件")
    args = ap.parse_args()

    params = json.loads(json.dumps(DEFAULT_PARAMS))  # deep copy
    if args.assignee is not None:
        params["assignee_default"] = args.assignee
    if args.emit_params:
        with open(args.emit_params, "w", encoding="utf-8") as f:
            json.dump({"params": params}, f, ensure_ascii=False, indent=2)
        print("params 已写出: %s" % args.emit_params)

    db = get_session_local()()
    try:
        kpi = resolve_kpi(db, args.entity_id, args.kpi_code, args.kpi_id)
        if not kpi:
            print("[BLOCK] entity=%s 内找不到 KPI code=%r（kpi_id=%s）——无法绑定，未写入任何行"
                  % (args.entity_id, args.kpi_code, args.kpi_id), file=sys.stderr)
            print("[INFO] 该账套现存 AR 相关 KPI：", file=sys.stderr)
            rows = db.query(KPIDefinition).filter(
                KPIDefinition.entity_id == args.entity_id,
                KPIDefinition.kpi_code.like("%AR%"),
            ).order_by(KPIDefinition.id).all()
            for r in rows:
                print("        id=%s code=%s name=%s" % (r.id, r.kpi_code, r.kpi_name), file=sys.stderr)
            print("[INFO] 处理：--kpi-id 显式指定，或财务先在 kpi_definitions 建 F_AR_002。",
                  file=sys.stderr)
            return 2

        from app.api.alert_rules import AlertRule
        exist = db.query(AlertRule).filter(
            AlertRule.entity_id == args.entity_id,
            AlertRule.rule_type == RULE_TYPE,
        ).all()
        print("== 将写入的行（%s）==" % ("APPLY" if args.apply else "DRY-RUN"))
        print(json.dumps({
            "entity_id": args.entity_id,
            "kpi_id": kpi.id,
            "kpi_code": kpi.kpi_code,
            "kpi_name": kpi.kpi_name,
            "rule_type": RULE_TYPE,
            "trigger_on": "actual",
            "enabled": 1,
            "params": params,
        }, ensure_ascii=False, indent=2))
        src = params.get("assignee_source") or {}
        if not params.get("assignee_default") and not src.get("mode"):
            print("[WARN] 责任人均未配置 → 运行期 fail-closed 400（阶段B 前须由财务给值）")

        if exist:
            print("[SKIP] entity=%s 已有 %d 条 ar_overdue 规则（id=%s），不重复播种"
                  % (args.entity_id, len(exist), [r.id for r in exist]))
            return 0
        if not args.apply:
            print("[DRY-RUN] 未写库。阶段B 授权后加 --apply。")
            return 0

        rule = AlertRule(
            entity_id=args.entity_id,
            kpi_id=kpi.id,
            rule_type=RULE_TYPE,
            trigger_on="actual",
            enabled=1,
            params=params,
        )
        db.add(rule)
        db.commit()
        db.refresh(rule)
        print("[APPLIED] 已写入 alert_rules.id=%s" % rule.id)
        return 0
    finally:
        db.close()


if __name__ == "__main__":
    raise SystemExit(main())