# app/tests/unit/integrations/exchange/test_service_candles.py

from __future__ import annotations

from datetime import datetime, timezone
from decimal import Decimal
from types import SimpleNamespace
from typing import Any, cast

import pytest

from src.integrations.exchange.exceptions import ExchangeError
from src.integrations.exchange.models import SymbolValidationResult
from src.integrations.exchange.service import ExchangeService
from src.market_data.acquisition.models.candle import Candle


def _set_test_attribute(
    target: object,
    name: str,
    value: object,
) -> None:
    setattr(cast(Any, target), name, value)


def _service(
    *,
    default_symbol: str = "BTC/USD_LEVERAGE",
    exchange_enabled: bool = True,
) -> ExchangeService:
    service = ExchangeService.__new__(ExchangeService)
    _set_test_attribute(
        service,
        "settings",
        SimpleNamespace(
            default_symbol=default_symbol,
            exchange_enabled=exchange_enabled,
        ),
    )
    return service


def _valid_symbol(
    symbol: str = "BTC/USD_LEVERAGE",
) -> SymbolValidationResult:
    return SymbolValidationResult(
        requested_symbol=symbol,
        normalized_symbol=symbol,
        is_valid=True,
        message="OK",
        symbol_info=None,
    )


def _invalid_symbol(
    symbol: str = "UNKNOWN",
) -> SymbolValidationResult:
    return SymbolValidationResult(
        requested_symbol=symbol,
        normalized_symbol=symbol,
        is_valid=False,
        message="Invalid symbol.",
        symbol_info=None,
    )


def _candle(
    *,
    symbol: str = "BTC/USD_LEVERAGE",
    interval: str = "1m",
    open_time_ms: int = 1_750_000_000_000,
) -> Candle:
    return Candle(
        symbol=symbol,
        interval=interval,
        open_time=datetime.fromtimestamp(
            open_time_ms / 1000,
            tz=timezone.utc,
        ),
        open_price=Decimal("100.10"),
        high_price=Decimal("110.20"),
        low_price=Decimal("90.30"),
        close_price=Decimal("105.40"),
        volume=Decimal("12.50"),
        source="rest_klines:bid",
    )


def test_get_candles_uses_default_symbol() -> None:
    service = _service(default_symbol="ETH/USD_LEVERAGE")
    requested_symbols: list[str] = []
    acquisition_calls: list[dict[str, object]] = []

    _set_test_attribute(
        service,
        "validate_symbol",
        lambda symbol: (
            requested_symbols.append(symbol) or _valid_symbol(symbol)
        ),
    )
    _set_test_attribute(
        service,
        "_load_candles_via_acquisition",
        lambda **kwargs: acquisition_calls.append(kwargs) or (),
    )

    result = service.get_candles()

    assert result == ()
    assert requested_symbols == ["ETH/USD_LEVERAGE"]
    assert acquisition_calls == [
        {
            "symbol": "ETH/USD_LEVERAGE",
            "interval": "1m",
            "limit": 200,
            "price_type": "bid",
        }
    ]


@pytest.mark.parametrize("limit", [0, -1, -100])
def test_get_candles_normalizes_non_positive_limit(limit: int) -> None:
    service = _service()
    captured: list[dict[str, object]] = []

    _set_test_attribute(
        service,
        "validate_symbol",
        lambda symbol: _valid_symbol(symbol),
    )
    _set_test_attribute(
        service,
        "_load_candles_via_acquisition",
        lambda **kwargs: captured.append(kwargs) or (),
    )

    service.get_candles(limit=limit)

    assert captured[0]["limit"] == 200


def test_get_candles_caps_limit_at_200() -> None:
    service = _service()
    captured: list[dict[str, object]] = []

    _set_test_attribute(
        service,
        "validate_symbol",
        lambda symbol: _valid_symbol(symbol),
    )
    _set_test_attribute(
        service,
        "_load_candles_via_acquisition",
        lambda **kwargs: captured.append(kwargs) or (),
    )

    service.get_candles(limit=500)

    assert captured[0]["limit"] == 200


@pytest.mark.parametrize("interval", ["1m", "5m", "15m", "1h"])
def test_get_candles_accepts_supported_intervals(interval: str) -> None:
    service = _service()
    captured: list[dict[str, object]] = []

    _set_test_attribute(
        service,
        "validate_symbol",
        lambda symbol: _valid_symbol(symbol),
    )
    _set_test_attribute(
        service,
        "_load_candles_via_acquisition",
        lambda **kwargs: captured.append(kwargs) or (),
    )

    service.get_candles(interval=interval)

    assert captured[0]["interval"] == interval


def test_get_candles_rejects_unsupported_interval() -> None:
    service = _service()

    with pytest.raises(
        ExchangeError,
        match="Unsupported kline interval",
    ):
        service.get_candles(interval="4h")


@pytest.mark.parametrize(
    ("price_type", "expected"),
    [
        ("bid", "bid"),
        ("ask", "ask"),
        (" BID ", "bid"),
        (" AsK ", "ask"),
        ("unknown", "bid"),
        ("", "bid"),
    ],
)
def test_get_candles_normalizes_price_type(
    price_type: str,
    expected: str,
) -> None:
    service = _service()
    captured: list[dict[str, object]] = []

    _set_test_attribute(
        service,
        "validate_symbol",
        lambda symbol: _valid_symbol(symbol),
    )
    _set_test_attribute(
        service,
        "_load_candles_via_acquisition",
        lambda **kwargs: captured.append(kwargs) or (),
    )

    service.get_candles(price_type=price_type)

    assert captured[0]["price_type"] == expected


def test_get_candles_rejects_mock_mode() -> None:
    service = _service(exchange_enabled=False)

    with pytest.raises(
        ExchangeError,
        match="Candles are not available in mock exchange mode",
    ):
        service.get_candles()


def test_get_candles_rejects_invalid_symbol() -> None:
    service = _service()
    _set_test_attribute(
        service,
        "validate_symbol",
        lambda symbol: _invalid_symbol(symbol),
    )

    with pytest.raises(ExchangeError, match="Invalid symbol"):
        service.get_candles("UNKNOWN")


def test_get_candles_calls_acquisition_with_exact_arguments() -> None:
    service = _service()
    captured: list[dict[str, object]] = []

    _set_test_attribute(
        service,
        "validate_symbol",
        lambda symbol: _valid_symbol("BTC/USD_LEVERAGE"),
    )
    _set_test_attribute(
        service,
        "_load_candles_via_acquisition",
        lambda **kwargs: captured.append(kwargs) or (),
    )

    service.get_candles(
        " btc/usd ",
        interval="5m",
        limit=123,
        price_type="ask",
    )

    assert captured == [
        {
            "symbol": "BTC/USD_LEVERAGE",
            "interval": "5m",
            "limit": 123,
            "price_type": "ask",
        }
    ]


def test_get_candles_preserves_result_identity() -> None:
    service = _service()
    candles = (_candle(),)

    _set_test_attribute(
        service,
        "validate_symbol",
        lambda symbol: _valid_symbol(symbol),
    )
    _set_test_attribute(
        service,
        "_load_candles_via_acquisition",
        lambda **kwargs: candles,
    )

    result = service.get_candles()

    assert result is candles


def test_get_candles_preserves_order() -> None:
    service = _service()
    first = _candle(open_time_ms=1000)
    second = _candle(open_time_ms=2000)
    candles = (second, first)

    _set_test_attribute(
        service,
        "validate_symbol",
        lambda symbol: _valid_symbol(symbol),
    )
    _set_test_attribute(
        service,
        "_load_candles_via_acquisition",
        lambda **kwargs: candles,
    )

    result = service.get_candles()

    assert result is candles
    assert result == (second, first)


def test_get_candles_preserves_empty_tuple_identity() -> None:
    service = _service()
    candles: tuple[Candle, ...] = ()

    _set_test_attribute(
        service,
        "validate_symbol",
        lambda symbol: _valid_symbol(symbol),
    )
    _set_test_attribute(
        service,
        "_load_candles_via_acquisition",
        lambda **kwargs: candles,
    )

    result = service.get_candles()

    assert result is candles


def test_get_candles_logs_and_wraps_acquisition_error() -> None:
    service = _service()
    original_error = RuntimeError("candles unavailable")
    log_calls: list[dict[str, object]] = []

    _set_test_attribute(
        service,
        "validate_symbol",
        lambda symbol: _valid_symbol(symbol),
    )

    def raise_error(**kwargs: object) -> tuple[Candle, ...]:
        raise original_error

    _set_test_attribute(
        service,
        "_load_candles_via_acquisition",
        raise_error,
    )
    _set_test_attribute(
        service,
        "_log_exchange_error",
        lambda **kwargs: log_calls.append(kwargs),
    )

    with pytest.raises(
        ExchangeError,
        match="candles unavailable",
    ) as error_info:
        service.get_candles(
            interval="15m",
            limit=25,
            price_type="ask",
        )

    assert error_info.value.__cause__ is original_error
    assert log_calls == [
        {
            "endpoint": "klines",
            "exc": original_error,
            "symbol": "BTC/USD_LEVERAGE",
            "extra_payload": {
                "interval": "15m",
                "limit": 25,
                "price_type": "ask",
            },
        }
    ]