"""Account + StrategyRunner 双层记账测试（spec §7）。"""
import pytest
from sanguo_trader.account import Account
from sanguo_trader.strategy_runner import StrategyRunner
from sanguo_trader.models import MatchSession, OrderSide, PaperTrade


def mktrade(side, price=10.0, volume=100, commission=5.0, stamp=0.0,
            transfer_fee=0.02, strategy_id="s1", symbol="600000"):
    return PaperTrade(
        strategy_id, symbol, side, price, volume, commission,
        stamp, transfer_fee, "", MatchSession.NEXT_OPEN,
    )


def test_capital_t0_sell_then_buy_immediately():
    """资金 T+0：卖出现金立即可用于再买。"""
    acc = Account(initial_capital=1_000_000)
    acc.apply_trade(mktrade(OrderSide.BUY, price=10.0, volume=100))
    acc.unfreeze_all()
    cash_after_buy = acc.cash
    acc.apply_trade(mktrade(OrderSide.SELL, price=11.0, volume=100, stamp=0.55))
    assert acc.cash > cash_after_buy                  # 卖出后现金立即增加
    assert acc.cash_enough(mktrade(OrderSide.BUY, price=11.0, volume=50))  # 可立即再买


def test_share_t1_buy_frozen_until_unfreeze():
    """股票 T+1：买入当日 frozen，unfreeze 后才可卖。"""
    acc = Account(initial_capital=1_000_000)
    acc.apply_trade(mktrade(OrderSide.BUY, volume=100))
    pos = acc.positions["600000"]
    assert pos.frozen == 100
    assert pos.available == 0
    acc.unfreeze_all()
    assert pos.available == 100


def test_cash_enough_insufficient_rejected():
    acc = Account(initial_capital=1000)
    # cost = 10*100 + 5 + 0.02 = 1005.02 > 1000
    assert acc.cash_enough(mktrade(OrderSide.BUY, price=10.0, volume=100)) is False


def test_transfer_fee_not_doubled_on_buy():
    """review H3：matcher 出双向 transfer_fee，Account 直接用不再 ×2。"""
    acc = Account(initial_capital=1_000_000)
    acc.apply_trade(mktrade(OrderSide.BUY, price=10.0, volume=100, transfer_fee=0.02))
    assert acc.cash == pytest.approx(1_000_000 - 1005.02)


def test_double_entry_account_equals_sum_of_runners():
    """双层记账一致性：总账持仓 = 各分户持仓之和。"""
    acc = Account(initial_capital=1_000_000)
    r1 = StrategyRunner("s1")
    r2 = StrategyRunner("s2")
    t1 = mktrade(OrderSide.BUY, volume=100, strategy_id="s1")
    t2 = mktrade(OrderSide.BUY, volume=200, strategy_id="s2")
    for t in (t1, t2):
        acc.apply_trade(t)
    r1.apply_trade(t1)
    r2.apply_trade(t2)
    assert acc.positions["600000"].volume == 300
    assert r1.positions["600000"].volume + r2.positions["600000"].volume == 300


def test_runner_realized_pnl_on_sell():
    acc = Account(initial_capital=1_000_000)
    runner = StrategyRunner("s1")
    buy_t = mktrade(OrderSide.BUY, price=10.0, volume=100, strategy_id="s1")
    acc.apply_trade(buy_t)
    runner.apply_trade(buy_t)
    acc.unfreeze_all()
    runner.unfreeze_all()
    sell_t = mktrade(OrderSide.SELL, price=12.0, volume=100, stamp=0.6, strategy_id="s1")
    acc.apply_trade(sell_t)
    runner.apply_trade(sell_t)
    # (12-10)*100 - 5(佣) - 0.6(印) - 0.02(过) = 194.38
    assert runner.realized_pnl == pytest.approx(194.38)


def test_equity_mark_to_market():
    acc = Account(initial_capital=1_000_000)
    acc.apply_trade(mktrade(OrderSide.BUY, price=10.0, volume=100))
    acc.unfreeze_all()
    acc.mark_to_market({"600000": 11.0})
    assert acc.market_value == pytest.approx(1100.0)
    assert acc.equity == pytest.approx(acc.cash + 1100.0)