from patcheval_miner.classify import classify, is_production_python, is_test_path
from patcheval_miner.models import Candidate, ChangedFile, IssueRef


def candidate(*, files: list[str], issues: bool = True, parents: int = 1) -> Candidate:
    return Candidate(
        id="owner__repo__pr1",
        repository="owner/repo",
        fix_sha="f" * 40,
        parent_sha="a" * 40 if parents == 1 else None,
        parent_count=parents,
        merged_at="2026-01-02T00:00:00Z",
        pr_number=1,
        pr_url="https://github.com/owner/repo/pull/1",
        pr_title="Fix bug",
        pr_body="Fixes #2",
        issues=[IssueRef(2, "https://example/2", "Bug", "Reproduction", "closing")]
        if issues
        else [],
        files=[ChangedFile(path, "modified", 2, 1) for path in files],
        changed_files_count=len(files),
    )


def test_path_classification() -> None:
    assert is_test_path("tests/unit/test_parser.py")
    assert is_test_path("testing/python/approx.py")
    assert is_test_path("package/parser_test.py")
    assert not is_test_path("src/package/parser.py")
    assert is_production_python("src/package/parser.py")
    assert not is_production_python("docs/example.py")


def test_eligible_fix_and_test() -> None:
    value = classify(
        candidate(files=["src/package/parser.py", "tests/test_parser.py"]),
        max_files=30,
        max_changed_lines=100,
    )
    assert value.structural_status == "eligible"
    assert value.rejection_reasons == []


def test_feature_without_bug_label_is_rejected() -> None:
    value = candidate(files=["src/package/parser.py", "tests/test_parser.py"])
    value.pr_title = "Add parser support"
    classified = classify(value, max_files=30, max_changed_lines=100)
    assert "no-bug-signal" in classified.rejection_reasons


def test_bug_label_can_supply_signal() -> None:
    value = candidate(files=["src/package/parser.py", "tests/test_parser.py"])
    value.pr_title = "Handle parser support"
    value.issues[0] = IssueRef(
        2,
        "https://example/2",
        "Parser fails",
        "Reproduction",
        "closing",
        ("type: bug",),
    )
    classified = classify(value, max_files=30, max_changed_lines=100)
    assert classified.structural_status == "eligible"


def test_rejections_are_explicit_and_additive() -> None:
    value = classify(
        candidate(files=["README.md"], issues=False, parents=2),
        max_files=30,
        max_changed_lines=100,
    )
    assert value.structural_status == "rejected"
    assert value.rejection_reasons == [
        "no-linked-issue",
        "ambiguous-parent",
        "no-production-python-change",
        "no-test-change",
    ]