from __future__ import annotations

from datetime import date

import pytest

from app.services.backtesting.fixture_source import (
    SEEDED_GLD_2024_FIXTURE_HISTORY,
    SharedHistoricalFixtureSource,
    WindowPolicy,
)
from app.services.backtesting.ui_service import BacktestPageService
from app.services.event_comparison_ui import EventComparisonPageService


def test_shared_fixture_source_exact_window_requires_seeded_bounds() -> None:
    source = SharedHistoricalFixtureSource(
        feature_label="BT-001A",
        supported_symbol="GLD",
        history=SEEDED_GLD_2024_FIXTURE_HISTORY,
        window_policy=WindowPolicy.EXACT,
    )

    rows = source.load_daily_closes("GLD", date(2024, 1, 2), date(2024, 1, 8))

    assert [row.date.isoformat() for row in rows] == [
        "2024-01-02",
        "2024-01-03",
        "2024-01-04",
        "2024-01-05",
        "2024-01-08",
    ]

    with pytest.raises(ValueError, match="seeded 2024-01-02 through 2024-01-08 window"):
        source.load_daily_closes("GLD", date(2024, 1, 3), date(2024, 1, 8))


def test_shared_fixture_source_bounded_window_allows_subranges_but_fails_closed_outside_seeded_bounds() -> None:
    source = SharedHistoricalFixtureSource(
        feature_label="BT-003A",
        supported_symbol="GLD",
        history=SEEDED_GLD_2024_FIXTURE_HISTORY,
        window_policy=WindowPolicy.BOUNDED,
    )

    rows = source.load_daily_closes("GLD", date(2024, 1, 3), date(2024, 1, 5))

    assert [row.date.isoformat() for row in rows] == ["2024-01-03", "2024-01-04", "2024-01-05"]

    with pytest.raises(ValueError, match="seeded 2024-01-02 through 2024-01-08 window"):
        source.load_daily_closes("GLD", date(2024, 1, 1), date(2024, 1, 8))

    with pytest.raises(ValueError, match="start_date must be on or before end_date"):
        source.load_daily_closes("GLD", date(2024, 1, 5), date(2024, 1, 3))


def test_backtest_page_service_uses_shared_exact_fixture_source() -> None:
    service = BacktestPageService()

    source = service.backtest_service.provider.source

    assert isinstance(source, SharedHistoricalFixtureSource)
    assert source.feature_label == "BT-001A"
    assert source.window_policy is WindowPolicy.EXACT


def test_event_comparison_page_service_uses_shared_bounded_fixture_source() -> None:
    service = EventComparisonPageService()

    source = service.comparison_service.provider.source

    assert isinstance(source, SharedHistoricalFixtureSource)
    assert source.feature_label == "BT-003A"
    assert source.window_policy is WindowPolicy.BOUNDED