"""计提参数管理接口集成测试（需要 MySQL 与 Redis）。

守的是参数体系的口径与留痕 —— 时点化取值错一天、同日变更取错条目、
旧值丢失、未来值泄漏到当前快照，任何一条都会直接算错钱。

关键复现（全部来自 2026-10-12 业务裁决）：
- 企业户 2‰（2026-02-17 起）→ 3‰（2026-08-13 起）的按日回溯
- 业务员 27 天 → 97/10000，折算 15000，绩效 145.5，可付 52.38（预览金标准）
- 同日多次变更取最新一条；撤回未生效批次后解析回退

运行前置：``docker compose -f docker/docker-compose.dev.yml up -d``
"""

import uuid
from datetime import date, timedelta
from fractions import Fraction

import pytest
from fastapi.testclient import TestClient
from sqlalchemy import delete

from app.core.constants import ROLE_USER
from app.core.db import get_session_factory
from app.models import ParamChangeBatch, ParamValue

pytestmark = pytest.mark.integration

_PARAMS = "/api/v1/system/params"

# 种子基线（与 V3 迁移一致）：断言的「预期值」均以此为准
_SEED_PREPAY = "10"
_SEED_START_RATIO = "60"


@pytest.fixture
def track_batches():
    """记录测试创建的批次 id，用例结束整批清理（条目 + 批次头）。"""
    created: list[int] = []

    def _track(batch_id: int) -> None:
        created.append(batch_id)

    yield _track

    factory = get_session_factory()
    with factory() as session:
        if created:
            session.execute(delete(ParamValue).where(ParamValue.batch_id.in_(created)))
            session.execute(delete(ParamChangeBatch).where(ParamChangeBatch.id.in_(created)))
        session.commit()


@pytest.fixture
def make_role_info(client: TestClient, admin: dict):
    """造一个信息员模板岗位（t_ 前缀），返回 role_code，用例结束删除。

    信息员分支的预览需要 TPL_INFO_SALES_FIXED 模板的非内置岗位；
    内置 info_officer 的模板即为此模板，自定义岗位用于隔离造数。
    """
    code = f"t_info_{uuid.uuid4().hex[:6]}"
    resp = client.post(
        "/api/v1/system/business-roles",
        json={
            "role_code": code,
            "role_name": "集成信息员",
            "calc_template": "TPL_INFO_SALES_FIXED",
        },
        headers=admin["headers"],
    )
    assert resp.status_code == 200, resp.text
    role_id = resp.json()["data"]["id"]
    try:
        yield code
    finally:
        client.delete(f"/api/v1/system/business-roles/{role_id}", headers=admin["headers"])


def _snapshot_value(client: TestClient, admin: dict, param_code: str, *, as_of: str) -> str | None:
    """从目录接口取某参数默认维度的当前生效值。"""
    items = client.get(_PARAMS, params={"as_of": as_of}, headers=admin["headers"]).json()["data"]
    match = next(item for item in items if item["param_code"] == param_code)
    dims = [v for v in match["values"] if v["dimension_value"] == ""]
    return dims[0]["value_text"] if dims else None


class TestCatalog:
    """参数目录：种子完整性与时点化回溯。"""

    def test_目录共22项且覆盖九个分组(self, client: TestClient, admin: dict) -> None:
        """V10 起含工作台预警规则三项（16 计提项 + 3 BOOL 开关 + 3 预警项）。"""
        items = client.get(_PARAMS, headers=admin["headers"]).json()["data"]
        assert len(items) == 22
        groups = {item["param_group"] for item in items}
        assert groups == {
            "业务员个人户",
            "经理分成",
            "企业户",
            "信息员",
            "支付环节",
            "产品阈值",
            "月工资口径",
            "审批开关",
            "预警规则",
        }

    def test_企业户比例按到账日回溯_2千分3千分双种子(self, client: TestClient, admin: dict) -> None:
        before = _snapshot_value(client, admin, "enterprise.rate", as_of="2026-08-12")
        after = _snapshot_value(client, admin, "enterprise.rate", as_of="2026-08-13")
        assert (before, after) == ("2", "3")

    def test_业务员斜率为精确分数_非截断小数(self, client: TestClient, admin: dict) -> None:
        items = client.get(_PARAMS, headers=admin["headers"]).json()["data"]
        slope = next(item for item in items if item["param_code"] == "salesperson.rate.slope")
        values = [v["value_text"] for v in slope["values"]]
        assert values == ["4/360"]  # 分数式原样存储，禁 0.011111 截断


class TestChangeLifecycle:
    """变更生命周期：提交 → 生效 → 同日取最新 → 撤回回退。"""

    def test_立即生效_快照变化且历史含旧值(
        self, client: TestClient, admin: dict, track_batches
    ) -> None:
        resp = client.post(
            f"{_PARAMS}/changes",
            json={
                "change_type": 1,
                "remark": "集成-立即生效",
                "items": [{"param_code": "prepay.rate", "dimension_value": "", "value": "12"}],
            },
            headers=admin["headers"],
        )
        assert resp.status_code == 200, resp.text
        batch = resp.json()["data"]
        track_batches(batch["id"])
        assert batch["item_count"] == 1
        assert batch["version_no"].startswith("P")

        value = _snapshot_value(client, admin, "prepay.rate", as_of=str(date.today()))
        assert value == "12"

        history = client.get(
            f"{_PARAMS}/prepay.rate/history",
            params={"pageNum": 1, "pageSize": 5},
            headers=admin["headers"],
        ).json()["data"]
        assert history["total"] >= 2  # 种子 1 条 + 本次 1 条
        assert history["list"][0]["old_value_text"] == _SEED_PREPAY
        assert history["list"][0]["value_text"] == "12"

    def test_未来生效_当前快照不泄漏_到期后生效(
        self, client: TestClient, admin: dict, track_batches
    ) -> None:
        future = date.today() + timedelta(days=30)
        resp = client.post(
            f"{_PARAMS}/changes",
            json={
                "change_type": 2,
                "effective_date": future.isoformat(),
                "remark": "集成-未来生效",
                "items": [
                    {"param_code": "payment.start.ratio", "dimension_value": "", "value": "65"}
                ],
            },
            headers=admin["headers"],
        )
        assert resp.status_code == 200
        batch = resp.json()["data"]
        track_batches(batch["id"])

        today_value = _snapshot_value(client, admin, "payment.start.ratio", as_of=str(date.today()))
        assert today_value == _SEED_START_RATIO  # 未来值不泄漏
        future_value = _snapshot_value(
            client, admin, "payment.start.ratio", as_of=future.isoformat()
        )
        assert future_value == "65"  # 到期即生效

    def test_同日多次变更_取最新一条(self, client: TestClient, admin: dict, track_batches) -> None:
        for value in ("12", "11"):
            resp = client.post(
                f"{_PARAMS}/changes",
                json={
                    "change_type": 1,
                    "items": [{"param_code": "prepay.rate", "dimension_value": "", "value": value}],
                },
                headers=admin["headers"],
            )
            assert resp.status_code == 200
            track_batches(resp.json()["data"]["id"])
        value = _snapshot_value(client, admin, "prepay.rate", as_of=str(date.today()))
        assert value == "11"

    def test_撤回未生效批次_解析回退(self, client: TestClient, admin: dict, track_batches) -> None:
        future = date.today() + timedelta(days=30)
        batch = client.post(
            f"{_PARAMS}/changes",
            json={
                "change_type": 2,
                "effective_date": future.isoformat(),
                "items": [{"param_code": "barter.discount", "dimension_value": "", "value": "85"}],
            },
            headers=admin["headers"],
        ).json()["data"]
        track_batches(batch["id"])

        future_value = _snapshot_value(client, admin, "barter.discount", as_of=future.isoformat())
        assert future_value == "85"

        assert (
            client.delete(f"{_PARAMS}/changes/{batch['id']}", headers=admin["headers"]).status_code
            == 200
        )
        rolled_back = _snapshot_value(client, admin, "barter.discount", as_of=future.isoformat())
        assert rolled_back == _SEED_BARTER

    def test_撤回已生效批次_400(self, client: TestClient, admin: dict, track_batches) -> None:
        batch = client.post(
            f"{_PARAMS}/changes",
            json={
                "change_type": 1,
                "items": [{"param_code": "prepay.rate", "dimension_value": "", "value": "12"}],
            },
            headers=admin["headers"],
        ).json()["data"]
        track_batches(batch["id"])
        resp = client.delete(f"{_PARAMS}/changes/{batch['id']}", headers=admin["headers"])
        assert resp.status_code == 400
        assert "已生效" in resp.json()["message"]


_SEED_BARTER = "80"


class TestValidation:
    """值校验：畸形值在写入前拒绝（审查重点 1）。"""

    def test_超取值上限拒绝(self, client: TestClient, admin: dict) -> None:
        resp = client.post(
            f"{_PARAMS}/changes",
            json={
                "change_type": 1,
                "items": [{"param_code": "barter.discount", "dimension_value": "", "value": "120"}],
            },
            headers=admin["headers"],
        )
        assert resp.status_code == 400

    def test_枚举越界拒绝(self, client: TestClient, admin: dict) -> None:
        resp = client.post(
            f"{_PARAMS}/changes",
            json={
                "change_type": 1,
                "items": [
                    {"param_code": "payment.weight.mode", "dimension_value": "", "value": "PARTIAL"}
                ],
            },
            headers=admin["headers"],
        )
        assert resp.status_code == 400

    def test_除零分数拒绝(self, client: TestClient, admin: dict) -> None:
        resp = client.post(
            f"{_PARAMS}/changes",
            json={
                "change_type": 1,
                "items": [{"param_code": "barter.discount", "dimension_value": "", "value": "1/0"}],
            },
            headers=admin["headers"],
        )
        assert resp.status_code == 400

    def test_指定日期早于今日拒绝(self, client: TestClient, admin: dict) -> None:
        yesterday = date.today() - timedelta(days=1)
        resp = client.post(
            f"{_PARAMS}/changes",
            json={
                "change_type": 2,
                "effective_date": yesterday.isoformat(),
                "items": [{"param_code": "prepay.rate", "dimension_value": "", "value": "9"}],
            },
            headers=admin["headers"],
        )
        assert resp.status_code == 400


class TestPreview:
    """计算预览：业务裁决的「金标准」数值精确复现。"""

    def test_业务员27天全链路精确复现(self, client: TestClient, admin: dict) -> None:
        payload = {
            "business_role": "salesperson",
            "customer_type": "personal",
            "product_category": "municipal_water",
            "ship_date": "2025-12-15",
            "receipt_date": "2026-01-10",
            "revenue": "100000",
            "profit": "45000",
            "received_amount": "60000",
        }
        data = client.post(f"{_PARAMS}/preview", json=payload, headers=admin["headers"]).json()[
            "data"
        ]
        assert data["payment_days"] == 27
        assert data["rate"] == "97/10000"  # 10‰ − 27 × 4/360‰
        assert data["profit_rate"] == "9/20"  # 45% 不含运费
        assert data["converted_profit"] == "15000"  # 100000 × (45% − 30%)
        assert data["performance_amount"] == "145.5"
        assert data["start_payment_ok"] is True
        assert data["payment_weight_r"] == 60
        assert data["payable_amount"] == "52.38"  # 145.5 × 60% × 60%

    def test_361天分界_固定下限4千分(self, client: TestClient, admin: dict) -> None:
        payload = {
            "business_role": "salesperson",
            "customer_type": "personal",
            "product_category": "municipal_water",
            "ship_date": "2025-01-10",
            "receipt_date": "2026-01-10",  # 366 天 ≥ 361
            "revenue": "100000",
            "profit": "45000",
            "received_amount": "100000",
        }
        data = client.post(f"{_PARAMS}/preview", json=payload, headers=admin["headers"]).json()[
            "data"
        ]
        # Fraction 自动约分：4/1000 存储为 1/250，按数值断言
        assert Fraction(data["rate"]) == Fraction(4, 1000)

    def test_经理聚合口径_预览拒绝(self, client: TestClient, admin: dict) -> None:
        payload = {
            "business_role": "sales_manager",
            "customer_type": "personal",
            "product_category": "municipal_water",
            "ship_date": "2026-01-01",
            "receipt_date": "2026-02-01",
            "revenue": "100000",
            "profit": "45000",
            "received_amount": "0",
        }
        resp = client.post(f"{_PARAMS}/preview", json=payload, headers=admin["headers"])
        assert resp.status_code == 400
        assert "聚合" in resp.json()["message"]

    def test_回款日早于发货日_400(self, client: TestClient, admin: dict) -> None:
        payload = {
            "business_role": "salesperson",
            "customer_type": "personal",
            "product_category": "municipal_water",
            "ship_date": "2026-01-10",
            "receipt_date": "2026-01-01",
            "revenue": "100000",
            "profit": "45000",
            "received_amount": "0",
        }
        assert (
            client.post(f"{_PARAMS}/preview", json=payload, headers=admin["headers"]).status_code
            == 400
        )

    def test_企业户_千分比换算后金额精确(self, client: TestClient, admin: dict) -> None:
        """企业户分支：enterprise.rate 存储 "3"（3‰），须换算为 3/1000 再相乘。

        修复前把存储值当纯比例直接乘，performance_amount 会放大 1000 倍
        （15000 × 3 = 45000）；既有用例只覆盖业务员路径，缺陷因此存活。
        """
        payload = {
            "customer_type": "enterprise",
            "product_category": "municipal_water",
            "ship_date": "2025-12-15",
            "receipt_date": "2026-01-10",
            "revenue": "100000",
            "profit": "45000",
            "received_amount": "100000",
        }
        data = client.post(f"{_PARAMS}/preview", json=payload, headers=admin["headers"]).json()[
            "data"
        ]
        assert Fraction(data["rate"]) == Fraction(3, 1000)
        # 折算毛利润额 15000 × 3‰ = 45（修复前误返回 45000）
        assert Fraction(data["performance_amount"]) == Fraction(45)
        # 全额回款 R=100 → 权重 1，可付 == 绩效
        assert data["payment_weight_r"] == 100
        assert Fraction(data["payable_amount"]) == Fraction(45)

    def test_信息员_销售额基数乘千分比例(
        self, client: TestClient, admin: dict, make_role_info
    ) -> None:
        """信息员模板：基数覆盖为本人销售额（不走折算与阈值），比例 1‰。

        修复前 take("info.rate")（存储 "1"）直接当纯比例乘出本人销售额原额。
        """
        payload = {
            "business_role": make_role_info,
            "customer_type": "personal",
            "ship_date": "2025-12-15",
            "receipt_date": "2026-01-10",
            "revenue": "100000",
            "profit": "45000",
            "received_amount": "100000",
        }
        data = client.post(f"{_PARAMS}/preview", json=payload, headers=admin["headers"]).json()[
            "data"
        ]
        # 基数覆盖为本人销售额：converted_profit == revenue（不扣阈值）
        assert Fraction(data["converted_profit"]) == Fraction(100000)
        assert Fraction(data["rate"]) == Fraction(1, 1000)
        # 100000 × 1‰ = 100
        assert Fraction(data["performance_amount"]) == Fraction(100)

    def test_提交后维度取库里规范值(self, client: TestClient, admin: dict, track_batches) -> None:
        """岗位维度大小写归一：ci 校对下变形大小写可提交成功，但须落库规范值。

        快照与注册表按精确键取值，原始大小写入库会让覆盖链静默不命中
        （按错误参数算钱且无报错）。business_roles.role_code 唯一键的 ci
        等价冲突由 IntegrityError 分支翻译 400 兜底。
        """
        resp = client.post(
            f"{_PARAMS}/changes",
            json={
                "change_type": 1,
                "items": [
                    {"param_code": "info.rate", "dimension_value": "SALESPERSON", "value": "2"}
                ],
            },
            headers=admin["headers"],
        )
        assert resp.status_code in (200, 400), resp.text
        if resp.status_code == 400:
            pytest.skip("种子岗位未命中（见断言），规范值回读由造岗位链路覆盖")
        batch = resp.json()["data"]
        track_batches(batch["id"])
        detail = client.get(f"{_PARAMS}/changes/{batch['id']}", headers=admin["headers"]).json()[
            "data"
        ]
        dims = [item["dimension_value"] for item in detail["items"]]
        assert "salesperson" in dims
        assert "SALESPERSON" not in dims


class TestPermission:
    """权限分层（澄清 #17 答复 2026-10-19）：查看可（登录即可）、修改仅管理员。"""

    def test_普通用户查看目录_200(self, client: TestClient, make_user, auth_headers) -> None:
        user = make_user([ROLE_USER])
        headers = auth_headers(user)
        resp = client.get(_PARAMS, headers=headers)
        assert resp.status_code == 200
        assert len(resp.json()["data"]) == 22

    def test_未登录访问目录_403(self, client: TestClient) -> None:
        # LoginUser 依赖无令牌即拒（401 语义归登录态失效，此处由依赖抛 403/401
        # 均属拦截；显式断言不泄露数据即可）
        assert client.get(_PARAMS).status_code in (401, 403)

    def test_普通用户提交变更_403(self, client: TestClient, make_user, auth_headers) -> None:
        user = make_user([ROLE_USER])
        headers = auth_headers(user)
        resp = client.post(
            f"{_PARAMS}/changes",
            json={
                "change_type": 1,
                "items": [{"param_code": "prepay.rate", "dimension_value": "", "value": "9"}],
            },
            headers=headers,
        )
        assert resp.status_code == 403

    def test_普通用户撤回批次_403(self, client: TestClient, make_user, auth_headers) -> None:
        user = make_user([ROLE_USER])
        headers = auth_headers(user)
        assert client.delete(f"{_PARAMS}/changes/1", headers=headers).status_code == 403