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import pytest

from app.services.literature_contract import LiteratureRequest, build_deterministic_contract


def test_latest_author_request_is_singular_and_date_ranked():
    result = build_deterministic_contract(
        "I need the latest paper of Jonas Gehring",
        LiteratureRequest(),
    )

    assert result.operation == "author_works"
    assert result.author_names == ["Jonas Gehring"]
    assert result.ranking == "publication_date"
    assert result.result_limit == 1


def test_top_five_2026_by_citations_is_year_bounded():
    result = build_deterministic_contract(
        "What are the top 5 papers of 2026 by citation?",
        LiteratureRequest(),
    )

    assert result.operation == "ranked_papers"
    assert result.year_start == result.year_end == 2026
    assert result.ranking == "citation_count"
    assert result.result_limit == 5


@pytest.mark.parametrize(
    ("query", "direction"),
    [
        ("top 5 papers that cite Attention Is All You Need", "cites_seed"),
        ("top 5 papers Attention Is All You Need cites", "cited_by_seed"),
    ],
)
def test_citation_direction_is_explicit(query, direction):
    result = build_deterministic_contract(query, LiteratureRequest())

    assert result.citation_direction == direction
    assert result.result_limit == 5
    assert result.ranking == "citation_count"


def test_explicit_author_constraint_survives_planner_topics():
    planned = LiteratureRequest(topics=["sequence modeling"], result_limit=5)

    result = build_deterministic_contract("latest paper by Jonas Gehring", planned)

    assert result.author_names == ["Jonas Gehring"]
    assert result.topics == ["sequence modeling"]
    assert result.result_limit == 1