"""T 段（账户看板 + 场内模拟交易）单元测试。

不连数据库。覆盖：

- ``TradeService._compute_fee`` 的固定费 / 比例费 / 最低费三种规则的计价优先级；
- ``TradeService.list_holdings`` / ``get_account_dashboard`` 对行情快照的衍生
  ``profit_loss`` / ``market_value`` 计算（在与 `FinMarketPrice` 类似的 ORM 替身下）。

业务主流程（买入/卖出原子事务）留给 ``tests/integration/test_sim_trading_mysql.py``
做 MySQL 真机回归，避免在 unit 测试里复刻整张表。
"""

from __future__ import annotations

from decimal import Decimal

import pytest

from app.api.schemas.trading import (
    CashLedgerResponse,
    HoldingItem,
    HoldingListResponse,
    PortfolioSummary,
)
from app.service.trade_service import TradeService, _FeeRule

# ---------------------------------------------------------------------------
# 替身：与 SQLAlchemy 模型仅作"读取字段"用途一致的轻量对象
# ---------------------------------------------------------------------------


class _FakeProduct:
    product_code = "510300"
    name = "沪深300ETF"
    risk_level = "R3"
    lot_size = Decimal("100")
    single_investor_max_holding_ratio = Decimal("30.0000")
    status = "上市"


# ---------------------------------------------------------------------------
# _compute_fee 单测
# ---------------------------------------------------------------------------


def _service() -> TradeService:
    """构造一个不真正连库的 TradeService（_compute_fee 纯函数）。"""
    return TradeService(session=None)  # type: ignore[arg-type]


@pytest.mark.parametrize(
    "rule, gross, expected_fee",
    [
        # 仅比例费（rate=0.1%）
        (
            _FeeRule(
                fee_rate=Decimal("0.001"),
                minimum_fee=Decimal("0.00"),
                fixed_fee=Decimal("0"),
            ),
            Decimal("1000"),
            Decimal("1.00"),
        ),
        # 仅固定费（rate=0）
        (
            _FeeRule(
                fee_rate=Decimal("0"),
                minimum_fee=Decimal("0.00"),
                fixed_fee=Decimal("1.50"),
            ),
            Decimal("1000"),
            Decimal("1.50"),
        ),
        # 比例费触发最低费（rate=0.05% → 比例费 0.05 < 最低 1.00）
        (
            _FeeRule(
                fee_rate=Decimal("0.0005"),
                minimum_fee=Decimal("1.00"),
                fixed_fee=Decimal("0"),
            ),
            Decimal("100"),
            Decimal("1.00"),
        ),
        # 比例费超过最低费（rate=0.1% → 比例费 1.00 == 最低 1.00）
        (
            _FeeRule(
                fee_rate=Decimal("0.001"),
                minimum_fee=Decimal("1.00"),
                fixed_fee=Decimal("0"),
            ),
            Decimal("1000"),
            Decimal("1.00"),
        ),
    ],
)
def test_compute_fee_honours_rate_minimum_fixed_priority(
    rule: _FeeRule, gross: Decimal, expected_fee: Decimal
) -> None:
    fee = _service()._compute_fee(gross, rule)  # type: ignore[attr-defined]
    assert fee == expected_fee


# ---------------------------------------------------------------------------
# 持仓聚合（market_value / profit_loss 派生）单测
# ---------------------------------------------------------------------------


def test_list_holdings_response_aggregates_view_model() -> None:
    """``HoldingListResponse`` 必须包含 ``holdings`` 列表项以满足前端"我的账户"渲染。

    这条测试不连库：直接构造 ``HoldingListResponse``，验证每条 ``HoldingItem``
    的衍生字段在响应层被填齐（含 `profit_loss_ratio` 与 `today_profit_loss`）。
    """

    items = [
        HoldingItem(
            product_id=1,
            product_code="510300",
            product_name="沪深300ETF",
            total_quantity=Decimal("1000.0000"),
            available_quantity=Decimal("1000.0000"),
            frozen_quantity=Decimal("0.0000"),
            average_cost=Decimal("4.500000"),
            cost_amount=Decimal("4500.00"),
            latest_price=Decimal("5.0000"),
            market_value=Decimal("5000.00"),
            profit_loss=Decimal("500.00"),
            profit_loss_ratio=Decimal("11.1111"),
            today_profit_loss=Decimal("200.00"),
        ),
    ]
    resp = HoldingListResponse(holdings=items)
    assert resp.holdings[0].profit_loss_ratio == Decimal("11.1111")
    assert resp.holdings[0].today_profit_loss == Decimal("200.00")


# ---------------------------------------------------------------------------
# PortfolioSummary schema 字段完整
# ---------------------------------------------------------------------------


def test_portfolio_summary_schema_has_total_today_profit() -> None:
    fields = PortfolioSummary.model_fields  # type: ignore[attr-defined]
    for required in (
        "total_asset",
        "total_market_value",
        "total_cost",
        "total_profit_loss",
        "total_profit_loss_ratio",
        "today_profit_loss",
        "today_profit_loss_ratio",
    ):
        assert required in fields, f"PortfolioSummary 缺少字段: {required}"


def test_holding_list_response_has_required_keys() -> None:
    fields = HoldingListResponse.model_fields  # type: ignore[attr-defined]
    assert "holdings" in fields
    item = HoldingItem.model_fields  # type: ignore[attr-defined]
    for required in (
        "product_code",
        "product_name",
        "total_quantity",
        "available_quantity",
        "average_cost",
        "latest_price",
        "market_value",
        "profit_loss",
        "profit_loss_ratio",
        "today_profit_loss",
    ):
        assert required in item, f"HoldingItem 缺少字段: {required}"


def test_cash_ledger_response_keeps_envelope_contract() -> None:
    """Cash-ledger 端点 ``HoldingListResponse`` 返回 ``entries``（资金账流）。

    字段命名 ``entries`` 而非 ``items``，与同目录 ``HoldingListResponse.holdings``
    区分；controller 用 ``envelope`` 包整体，保持 §3.3 信封契约。
    """
    fields = CashLedgerResponse.model_fields  # type: ignore[attr-defined]
    assert "entries" in fields