"""`query_customer_profile` 工具 + 画像字段投影的单元测试。

覆盖四条要求，两个方向都要有牙：

1. **字段策略**：只投影白名单字段，**绝不返回 PII**
   （`real_name`/`birth_date`/`mobile_masked`）；且白名单是**白名单**——
   快照里新增未知字段不会自动外泄。
2. **测评有效期实时判定**：`assessment_expired` 按**当前时间**重算，不信快照里的布尔值。
3. **失败关闭**：无当前画像 / 快照非法 → **抛错**，不返回 `{}`
   （空画像会被下游误读成"该客户无偏好"）。
4. **越范围不泄露**：他人客户一律按"不存在"处理，且拒绝时不得暴露目标客户是否存在。
"""

from datetime import UTC, datetime, timedelta
from typing import Any

import pytest

from app.core.contracts import RequestContext
from app.core.errors import ForbiddenAgentError, GenericResourceNotFoundError
from app.core.profile_projection import project_profile
from app.service.customer_profile_service import (
    ALLOWED_FIELDS,
    AUDIT_ACTION,
    CustomerProfileQuery,
    CustomerProfileService,
    query_customer_profile_tool,
)

NOW = datetime(2026, 9, 10, 12, 0, tzinfo=UTC)


# ---------------------------------------------------------------------------
# 替身
# ---------------------------------------------------------------------------


class FakeSession:
    """只实现本服务用到的两件事：读快照与写审计。"""

    def __init__(self) -> None:
        self.added: list[Any] = []

    async def __aenter__(self) -> "FakeSession":
        return self

    async def __aexit__(self, *args: object) -> None:
        return None

    def begin(self) -> "FakeSession":
        return self

    def add(self, item: Any) -> None:
        self.added.append(item)


def context(
    user_id: str = "9101",
    *,
    scopes: dict[str, str] | None = None,
    customer_ids: tuple[str, ...] = (),
    permissions: tuple[str, ...] = ("memory:read:self", "memory:read:customer"),
) -> RequestContext:
    return RequestContext(
        user_id=user_id,
        trace_id="trace-1",
        roles=("customer",),
        permissions=permissions,
        permission_scopes=scopes or {"memory:read:self": "self", "memory:read:customer": "self"},
        customer_ids=customer_ids,
    )


def snapshot(**overrides: Any) -> dict[str, Any]:
    base: dict[str, Any] = {
        "investor_type": "C5",
        "investment_horizon": "long_term",
        "trading_frequency": "high",
        "preferred_asset_class": ["equity_fund"],
        "risk_tags": ["aggressive"],
        "customer_tier": "diamond",
        "behavior_score": 88,
        "total_asset": "12800000.00",
        "assessment_valid_until": (NOW + timedelta(days=100)).isoformat(),
        "assessment_expired": False,
    }
    base.update(overrides)
    return base


def wire(monkeypatch: pytest.MonkeyPatch, rows: list[dict[str, Any]]) -> FakeSession:
    """把 `PlatformRepository.rows` 换成返回给定行的替身。"""
    session = FakeSession()

    class FakeRepo:
        def __init__(self, _session: Any) -> None:
            pass

        async def rows(self, *_a: Any, **_kw: Any) -> list[dict[str, Any]]:
            return rows

    monkeypatch.setattr("app.service.customer_profile_service.PlatformRepository", FakeRepo)
    monkeypatch.setattr(
        "app.service.customer_profile_service.SessionFactory", lambda: session
    )
    return session


def row(payload: dict[str, Any] | None = None, version: int = 1) -> dict[str, Any]:
    return {"snapshot": payload if payload is not None else snapshot(), "version": version}


# ---------------------------------------------------------------------------
# 1. 字段策略
# ---------------------------------------------------------------------------


def test_projection_only_exposes_whitelisted_fields() -> None:
    """白名单：快照里混入 PII 与未知字段都不得外泄。"""
    dirty = snapshot(
        real_name="陈宏远",
        birth_date="1972-06-15",
        mobile_masked="138****0101",
        trade_account="TA91010001",
        some_future_field="会外泄吗",
    )
    projected = project_profile(dirty, now=NOW)

    assert set(projected) <= ALLOWED_FIELDS, "投影结果出现了白名单外的字段"
    leaks = ("real_name", "birth_date", "mobile_masked", "trade_account", "some_future_field")
    for leaked in leaks:
        assert leaked not in projected, f"{leaked} 不该外泄"


def test_projection_returns_empty_for_malformed_snapshot() -> None:
    assert project_profile(None, now=NOW) == {}
    assert project_profile([], now=NOW) == {}
    assert project_profile("not-a-dict", now=NOW) == {}


# ---------------------------------------------------------------------------
# 2. 测评有效期实时判定
# ---------------------------------------------------------------------------


def test_assessment_expired_is_recomputed_not_trusted() -> None:
    """**反向断言**：快照谎报 `assessment_expired=False`，但有效期已过 → 必须判为过期。"""
    lying = snapshot(
        assessment_valid_until=(NOW - timedelta(days=1)).isoformat(),
        assessment_expired=False,   # ← 快照里的值是错的
    )
    projected = project_profile(lying, now=NOW)
    assert projected["assessment_expired"] is True, "不能信快照里的布尔值"


def test_assessment_valid_until_just_now_counts_as_expired() -> None:
    """边界：有效期正好等于当前时间视为**已过期**（与 SuitabilityService 口径一致）。"""
    projected = project_profile(
        snapshot(assessment_valid_until=NOW.isoformat()), now=NOW
    )
    assert projected["assessment_expired"] is True


def test_unparseable_valid_until_keeps_field_but_does_not_claim_expired() -> None:
    """有效期无法解析时不臆造"过期"判定（也不删除原始值）。"""
    projected = project_profile(snapshot(assessment_valid_until="昨天"), now=NOW)
    assert projected["assessment_valid_until"] == "昨天"
    assert "assessment_expired" not in projected or projected["assessment_expired"] is False


# ---------------------------------------------------------------------------
# 3. 失败关闭
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_missing_snapshot_fails_closed(monkeypatch: pytest.MonkeyPatch) -> None:
    """无当前画像必须**抛错**，不能返回空画像。"""
    wire(monkeypatch, [])
    with pytest.raises(GenericResourceNotFoundError, match="暂无当前画像"):
        await query_customer_profile_tool(CustomerProfileQuery(customer_id="9101"), context())


@pytest.mark.asyncio
async def test_empty_snapshot_fails_closed(monkeypatch: pytest.MonkeyPatch) -> None:
    """快照存在但内容非法（投影为空）同样失败关闭。"""
    wire(monkeypatch, [row(payload={})])
    with pytest.raises(GenericResourceNotFoundError):
        await query_customer_profile_tool(CustomerProfileQuery(customer_id="9101"), context())


# ---------------------------------------------------------------------------
# 4. 鉴权与数据范围
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_customer_can_read_own_profile(monkeypatch: pytest.MonkeyPatch) -> None:
    session = wire(monkeypatch, [row()])
    out = await query_customer_profile_tool(
        CustomerProfileQuery(customer_id="9101"), context("9101")
    )
    assert out["profile"]["investor_type"] == "C5"
    assert out["customer_id"] == "9101"
    # 审计与读取同事务落库
    assert [a.action_type for a in session.added] == [AUDIT_ACTION]


@pytest.mark.asyncio
async def test_reading_another_customer_without_scope_is_denied_as_not_found(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    """越范围一律按"不存在"处理，不泄露目标客户是否存在。"""
    wire(monkeypatch, [row()])
    with pytest.raises(GenericResourceNotFoundError, match="客户不可访问"):
        await query_customer_profile_tool(
            CustomerProfileQuery(customer_id="9103"), context("9101")
        )


@pytest.mark.asyncio
async def test_own_customers_scope_allows_assigned_customer(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    """`own_customers` 且客户确实归属调用者时才放行。"""
    wire(monkeypatch, [row()])
    scopes = {"memory:read:self": "self", "memory:read:customer": "own_customers"}
    out = await query_customer_profile_tool(
        CustomerProfileQuery(customer_id="9103"),
        context("9002", scopes=scopes, customer_ids=("9103",)),
    )
    assert out["customer_id"] == "9103"


@pytest.mark.asyncio
async def test_all_scope_allows_any_customer(monkeypatch: pytest.MonkeyPatch) -> None:
    wire(monkeypatch, [row()])
    out = await query_customer_profile_tool(
        CustomerProfileQuery(customer_id="9999"),
        context("9003", scopes={"memory:read:self": "self", "memory:read:customer": "all"}),
    )
    assert out["customer_id"] == "9999"


@pytest.mark.asyncio
async def test_missing_permission_is_denied(monkeypatch: pytest.MonkeyPatch) -> None:
    """连权限都没有：直接 403 语义（`ForbiddenAgentError`），并且会写权限拒绝审计。"""
    wire(monkeypatch, [row()])
    with pytest.raises(ForbiddenAgentError):
        await query_customer_profile_tool(
            CustomerProfileQuery(customer_id="9101"), context("9101", permissions=())
        )


# ---------------------------------------------------------------------------
# 5. 字段筛选
# ---------------------------------------------------------------------------


@pytest.mark.asyncio
async def test_requested_fields_filter_the_projection(monkeypatch: pytest.MonkeyPatch) -> None:
    wire(monkeypatch, [row()])
    out = await query_customer_profile_tool(
        CustomerProfileQuery(customer_id="9101", fields=("investor_type", "assessment_expired")),
        context("9101"),
    )
    assert set(out["profile"]) == {"investor_type", "assessment_expired"}


@pytest.mark.asyncio
async def test_requesting_a_pii_field_is_rejected(monkeypatch: pytest.MonkeyPatch) -> None:
    """Agent 不能通过 `fields` 参数把 PII 要出来。"""
    wire(monkeypatch, [row()])
    with pytest.raises(ForbiddenAgentError, match="不支持查询画像字段"):
        await query_customer_profile_tool(
            CustomerProfileQuery(customer_id="9101", fields=("real_name",)), context("9101")
        )


def test_query_model_rejects_non_numeric_customer_id() -> None:
    from pydantic import ValidationError

    with pytest.raises(ValidationError):
        CustomerProfileQuery(customer_id="abc")


@pytest.mark.asyncio
async def test_service_is_injectable_for_tests(monkeypatch: pytest.MonkeyPatch) -> None:
    """`session_factory` 可注入（单测不连库）。"""
    wire(monkeypatch, [row(version=3)])
    view = await CustomerProfileService().load(
        CustomerProfileQuery(customer_id="9101"), context("9101"), now=NOW
    )
    assert view.version == "3"