"""Tests for congress trading service (TDD - RED phase first)."""

from unittest.mock import AsyncMock, MagicMock, patch

import pytest


# --- get_congress_trades ---


@pytest.mark.asyncio
async def test_get_congress_trades_happy_path():
    """Returns list of trade dicts when OBB call succeeds."""
    expected = [
        {
            "representative": "Nancy Pelosi",
            "ticker": "NVDA",
            "transaction_date": "2024-01-15",
            "transaction_type": "Purchase",
            "amount": "$1,000,001-$5,000,000",
        }
    ]

    import congress_service

    mock_fn = MagicMock()
    with patch.object(congress_service, "_get_congress_fn", return_value=mock_fn), \
         patch.object(congress_service, "_try_obb_call", new_callable=AsyncMock, return_value=expected):
        result = await congress_service.get_congress_trades()

    assert isinstance(result, list)
    assert len(result) == 1
    assert result[0]["representative"] == "Nancy Pelosi"


@pytest.mark.asyncio
async def test_get_congress_trades_returns_empty_when_fn_not_available():
    """Returns empty list when OBB congress function is not available."""
    import congress_service

    with patch.object(congress_service, "_get_congress_fn", return_value=None):
        result = await congress_service.get_congress_trades()

    assert result == []


@pytest.mark.asyncio
async def test_get_congress_trades_returns_empty_on_all_provider_failures():
    """Returns empty list when all providers fail (_try_obb_call returns None)."""
    import congress_service

    mock_fn = MagicMock()
    with patch.object(congress_service, "_get_congress_fn", return_value=mock_fn), \
         patch.object(congress_service, "_try_obb_call", new_callable=AsyncMock, return_value=None):
        result = await congress_service.get_congress_trades()

    assert result == []


@pytest.mark.asyncio
async def test_get_congress_trades_empty_list_result():
    """Returns empty list when _try_obb_call returns empty list."""
    import congress_service

    mock_fn = MagicMock()
    with patch.object(congress_service, "_get_congress_fn", return_value=mock_fn), \
         patch.object(congress_service, "_try_obb_call", new_callable=AsyncMock, return_value=[]):
        result = await congress_service.get_congress_trades()

    assert result == []


# --- _get_congress_fn ---


def test_get_congress_fn_returns_none_when_attribute_missing():
    """Returns None gracefully when obb.regulators.government_us is absent."""
    import congress_service

    mock_obb = MagicMock(spec=[])  # spec with no attributes
    with patch.object(congress_service, "obb", mock_obb):
        result = congress_service._get_congress_fn()

    assert result is None


def test_get_congress_fn_returns_callable_when_available():
    """Returns the congress_trading callable when attribute exists."""
    import congress_service

    mock_fn = MagicMock()
    mock_obb = MagicMock()
    mock_obb.regulators.government_us.congress_trading = mock_fn

    with patch.object(congress_service, "obb", mock_obb):
        result = congress_service._get_congress_fn()

    assert result is mock_fn


# --- _try_obb_call ---


@pytest.mark.asyncio
async def test_try_obb_call_returns_list_on_success():
    """_try_obb_call converts OBBject result to list via to_list."""
    import congress_service

    mock_result = MagicMock()
    expected = [{"ticker": "AAPL"}]

    with patch.object(congress_service, "to_list", return_value=expected), \
         patch("congress_service.asyncio.to_thread", new_callable=AsyncMock, return_value=mock_result):
        result = await congress_service._try_obb_call(MagicMock())

    assert result == expected


@pytest.mark.asyncio
async def test_try_obb_call_returns_none_on_exception():
    """_try_obb_call returns None when asyncio.to_thread raises."""
    import congress_service

    with patch("congress_service.asyncio.to_thread", new_callable=AsyncMock, side_effect=Exception("fail")):
        result = await congress_service._try_obb_call(MagicMock())

    assert result is None


# --- search_congress_bills ---


@pytest.mark.asyncio
async def test_search_congress_bills_happy_path():
    """Returns list of bill dicts when OBB call succeeds."""
    expected = [
        {"title": "Infrastructure Investment and Jobs Act", "bill_id": "HR3684"},
        {"title": "Inflation Reduction Act", "bill_id": "HR5376"},
    ]

    import congress_service

    mock_fn = MagicMock()
    with patch.object(congress_service, "_get_congress_fn", return_value=mock_fn), \
         patch.object(congress_service, "_try_obb_call", new_callable=AsyncMock, return_value=expected):
        result = await congress_service.search_congress_bills("infrastructure")

    assert isinstance(result, list)
    assert len(result) == 2
    assert result[0]["bill_id"] == "HR3684"


@pytest.mark.asyncio
async def test_search_congress_bills_returns_empty_when_fn_not_available():
    """Returns empty list when OBB function is not available."""
    import congress_service

    with patch.object(congress_service, "_get_congress_fn", return_value=None):
        result = await congress_service.search_congress_bills("taxes")

    assert result == []


@pytest.mark.asyncio
async def test_search_congress_bills_returns_empty_on_failure():
    """Returns empty list when all providers fail."""
    import congress_service

    mock_fn = MagicMock()
    with patch.object(congress_service, "_get_congress_fn", return_value=mock_fn), \
         patch.object(congress_service, "_try_obb_call", new_callable=AsyncMock, return_value=None):
        result = await congress_service.search_congress_bills("taxes")

    assert result == []


@pytest.mark.asyncio
async def test_search_congress_bills_empty_results():
    """Returns empty list when _try_obb_call returns empty list."""
    import congress_service

    mock_fn = MagicMock()
    with patch.object(congress_service, "_get_congress_fn", return_value=mock_fn), \
         patch.object(congress_service, "_try_obb_call", new_callable=AsyncMock, return_value=[]):
        result = await congress_service.search_congress_bills("nonexistent")

    assert result == []