from unittest.mock import AsyncMock, patch

import pytest

from app.services.match_service import attempt_match, _format_interests


@pytest.mark.asyncio
async def test_no_match_when_sessions_missing() -> None:
    with patch("app.services.match_service.get_session", return_value=None):
        result = await attempt_match("token_a", "token_b")
    assert result["match"] is False
    assert result["nudge_sent"] is False


@pytest.mark.asyncio
async def test_no_match_when_no_shared_interests() -> None:
    sessions = {
        "token_a": {"interests": ["devops"]},
        "token_b": {"interests": ["cooking"]},
    }

    async def fake_get(token: str) -> dict:
        return sessions.get(token)

    with patch("app.services.match_service.get_session", side_effect=fake_get):
        with patch("app.services.match_service.manager") as mock_mgr:
            result = await attempt_match("token_a", "token_b")

    assert result["match"] is False
    mock_mgr.send.assert_not_called()


@pytest.mark.asyncio
async def test_match_with_shared_interests() -> None:
    sessions = {
        "token_a": {"interests": ["devops", "hardstyle"]},
        "token_b": {"interests": ["hardstyle", "philosophy"]},
    }

    async def fake_get(token: str) -> dict:
        return sessions.get(token)

    with patch("app.services.match_service.get_session", side_effect=fake_get):
        with patch("app.services.match_service.manager") as mock_mgr:
            mock_mgr.send = AsyncMock()
            result = await attempt_match("token_a", "token_b")

    assert result["match"] is True
    assert "hardstyle" in result["shared_interests"]
    assert result["nudge_sent"] is True
    assert mock_mgr.send.call_count == 2


def test_format_interests_single() -> None:
    assert _format_interests(["devops"]) == "devops"


def test_format_interests_multiple() -> None:
    result = _format_interests(["devops", "hardstyle"])
    assert result == "devops and hardstyle"