from app.engine.summary_consensus import character_f1, select_consensus


def test_medoid_prefers_agreed_event_over_outlier():
    candidates = ["김씨는 학교를 세웠다.", "김씨는 학교를 세웠다.", "김씨는 미국으로 이민했다."]
    assert select_consensus(candidates) == 0


def test_overlength_consensus_cannot_win():
    long = "긴" * 51
    assert select_consensus([long, long, "학교를 세웠다."]) == 2
    assert select_consensus([long, ""]) == -1


def test_empty_outputs_do_not_change_candidate_choice():
    assert select_consensus(["", "학교를 세웠다.", "학교를 세웠다."]) == 1
    assert character_f1("", "") == 0


def test_bigram_overlap_keeps_multiplicity():
    assert character_f1("가가가", "가가") == 2 / 3


def test_word_overlap_and_invalid_weight():
    import pytest
    from app.engine.summary_consensus import word_f1
    assert word_f1("a b c", "a b") == 2 / 3
    assert word_f1("a", "a") == 0
    with pytest.raises(ValueError):
        select_consensus(["요약"], word_weight=1.5)


def test_public_summary_reports_invalid_when_every_candidate_fails(monkeypatch):
    from app.engine import summary_consensus
    monkeypatch.setattr(summary_consensus, "generate_candidates", lambda client, text: [
        {"summary": "", "finish_reason": "length"}, {"summary": "긴" * 51, "finish_reason": "stop"}])
    result = summary_consensus.summarize_short(None, "원문")
    assert result["valid"] is False
    assert result["summary"] == ""
    assert result["selected_index"] == -1