from __future__ import annotations

from datetime import datetime
from decimal import Decimal

import pytest

from broker_sync.models import ActivityType
from broker_sync.providers.ibkr import (
    IBKRAccountMismatchError,
    IBKRProvider,
    _map_cash_to_activity,
    _map_trade_to_activity,
    canonical_symbol,
)

# -- canonical_symbol --


def test_canonical_symbol_lse_etf_gets_l_suffix() -> None:
    assert canonical_symbol("VUAG", exchange="LSEETF", currency="GBP") == "VUAG.L"


def test_canonical_symbol_us_stock_unchanged() -> None:
    assert canonical_symbol("AAPL", exchange="NASDAQ", currency="USD") == "AAPL"


def test_canonical_symbol_lse_gbp_inferred_when_exchange_missing() -> None:
    """IBKR Flex sometimes omits exchange — infer LSE from currency==GBP."""
    assert canonical_symbol("VUAG", exchange=None, currency="GBP") == "VUAG.L"


def test_canonical_symbol_already_suffixed_unchanged() -> None:
    assert canonical_symbol("VUAG.L", exchange="LSEETF", currency="GBP") == "VUAG.L"


# -- Trade mapping --


def test_map_trade_buy_to_activity() -> None:
    from ibflex import parser

    r = parser.parse("tests/fixtures/ibkr/sample_flex.xml")
    trade = r.FlexStatements[0].Trades[0]  # T1001: 10 VUAG BUY @ 107.50 GBP, comm -1.05

    activity = _map_trade_to_activity(trade, account_id="wf-acct-uuid")

    assert activity.external_id == "ibkr:trade:T1001"
    assert activity.account_id == "wf-acct-uuid"
    assert activity.activity_type == ActivityType.BUY
    assert activity.symbol == "VUAG.L"
    assert activity.quantity == Decimal("10")
    assert activity.unit_price == Decimal("107.50")
    assert activity.fee == Decimal("1.05")
    assert activity.currency == "GBP"
    assert isinstance(activity.date, datetime)
    assert activity.date.tzinfo is not None


def test_map_trade_sell_to_activity() -> None:
    from ibflex import parser

    r = parser.parse("tests/fixtures/ibkr/sample_flex.xml")
    trade = r.FlexStatements[0].Trades[2]  # T1003: 2 VUAG SELL @ 108.00 GBP

    activity = _map_trade_to_activity(trade, account_id="wf-acct")
    assert activity.activity_type == ActivityType.SELL
    assert activity.symbol == "VUAG.L"
    assert activity.quantity == Decimal("2")
    assert activity.unit_price == Decimal("108.00")


def test_map_trade_us_stock_keeps_usd_currency_and_no_suffix() -> None:
    from ibflex import parser

    r = parser.parse("tests/fixtures/ibkr/sample_flex.xml")
    trade = r.FlexStatements[0].Trades[1]  # T1002: AAPL BUY USD

    activity = _map_trade_to_activity(trade, account_id="wf-acct")
    assert activity.symbol == "AAPL"
    assert activity.currency == "USD"


# -- Cash mapping --


def test_map_cash_dividend_to_activity() -> None:
    from ibflex import parser

    r = parser.parse("tests/fixtures/ibkr/sample_flex.xml")
    cash = r.FlexStatements[0].CashTransactions[0]  # C5001: Dividends 3.50 GBP

    activity = _map_cash_to_activity(cash, account_id="wf-acct")
    assert activity is not None
    assert activity.external_id == "ibkr:cash:C5001"
    assert activity.activity_type == ActivityType.DIVIDEND
    assert activity.amount == Decimal("3.50")
    assert activity.currency == "GBP"


def test_map_cash_withholding_tax_to_tax_activity() -> None:
    from ibflex import parser

    r = parser.parse("tests/fixtures/ibkr/sample_flex.xml")
    cash = r.FlexStatements[0].CashTransactions[1]  # C5002: Withholding Tax -0.35 GBP

    activity = _map_cash_to_activity(cash, account_id="wf-acct")
    assert activity is not None
    assert activity.activity_type == ActivityType.TAX
    assert activity.amount == Decimal("0.35")  # always positive on Activity


def test_map_cash_unknown_type_returns_none_and_logs(caplog: pytest.LogCaptureFixture) -> None:
    """Unknown CashTransaction.type produces None + a WARNING log line."""

    class FakeType:
        name = "FrobnicatedThing"

    class FakeCash:
        transactionID = "C9999"
        dateTime = None
        type = FakeType()
        amount = Decimal("0")
        currency = "GBP"

    with caplog.at_level("WARNING"):
        result = _map_cash_to_activity(FakeCash, account_id="wf-acct")
    assert result is None
    assert any("FROBNICATEDTHING" in r.message for r in caplog.records)


# -- IBKRProvider end-to-end --


async def test_ibkr_provider_fetch_returns_mapped_activities(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    """IBKRProvider.fetch() yields all mapped activities (trades + cash)."""
    from ibflex import client as ib_client

    with open("tests/fixtures/ibkr/sample_flex.xml", "rb") as f:
        xml_bytes = f.read()
    monkeypatch.setattr(ib_client, "download", lambda *a, **kw: xml_bytes)

    provider = IBKRProvider(
        token="t",
        query_id="q",
        upstream_account_id="U12345678",
    )
    activities = [a async for a in provider.fetch()]
    # 3 trades + 2 cash = 5
    assert len(activities) == 5
    types = sorted(a.activity_type.name for a in activities)
    assert types == ["BUY", "BUY", "DIVIDEND", "SELL", "TAX"]


async def test_ibkr_provider_account_mismatch_raises(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    """Mismatched accountId raises and writes nothing."""
    from ibflex import client as ib_client

    with open("tests/fixtures/ibkr/sample_flex.xml", "rb") as f:
        xml_bytes = f.read()
    monkeypatch.setattr(ib_client, "download", lambda *a, **kw: xml_bytes)

    provider = IBKRProvider(
        token="t",
        query_id="q",
        upstream_account_id="U99999999",  # WRONG
    )
    with pytest.raises(IBKRAccountMismatchError, match="U12345678"):
        _ = [a async for a in provider.fetch()]


async def test_ibkr_provider_open_positions_after_fetch(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    """open_positions() returns canonicalised symbol + qty after fetch drained."""
    from ibflex import client as ib_client

    with open("tests/fixtures/ibkr/sample_flex.xml", "rb") as f:
        xml_bytes = f.read()
    monkeypatch.setattr(ib_client, "download", lambda *a, **kw: xml_bytes)

    provider = IBKRProvider(
        token="t",
        query_id="q",
        upstream_account_id="U12345678",
    )
    # drain the iterator before reading positions
    [a async for a in provider.fetch()]

    positions = provider.open_positions()
    # VUAG → VUAG.L (LSE inferred from GBP); AAPL unchanged (USD)
    assert dict(positions) == {"VUAG.L": Decimal("8"), "AAPL": Decimal("5")}