"""The shared exemption predicates in file_length.exemptions."""

from __future__ import annotations

from pathlib import Path

import pytest

from file_length.config import (
    DATA_TXT_MAX_MEAN_LINE,
    is_data_text,
    is_generated,
    is_session_artifact,
    is_vendored,
)
from file_length.tests.conftest import write


def test_generated_by_extension_pattern(tmp_path: Path) -> None:
    assert is_generated(tmp_path / "model.g.dart")
    assert is_generated(tmp_path / "lib" / "generated" / "x.py")


def test_generated_by_header_marker(tmp_path: Path) -> None:
    marked = write(tmp_path, "a.py", "# line\n# @generated by tool\nx = 1\n")
    plain = write(tmp_path, "b.py", "x = 1\n")
    assert is_generated(marked)
    assert not is_generated(plain)


def test_generated_unreadable_is_false(tmp_path: Path) -> None:
    assert not is_generated(tmp_path / "missing.py")


def test_data_text_only_for_short_line_txt(tmp_path: Path) -> None:
    short = int(DATA_TXT_MAX_MEAN_LINE) - 1
    assert is_data_text(tmp_path / "words.txt", lines=10, size=short * 10)
    assert not is_data_text(tmp_path / "prose.txt", lines=10, size=80 * 10)
    assert not is_data_text(tmp_path / "words.py", lines=10, size=10)
    assert not is_data_text(tmp_path / "empty.txt", lines=0, size=0)


@pytest.mark.parametrize(
    "path",
    [
        "/home/u/repo/node_modules/pkg/index.js",
        "/home/u/repo/.claude/skills/x/SKILL.md",
        "/home/u/mcp-servers/servers/foo/main.py",
        "/home/u/aseprite-mcp/src/x.py",
    ],
)
def test_vendored_paths(path: str) -> None:
    assert is_vendored(Path(path))


def test_own_code_is_not_vendored() -> None:
    assert not is_vendored(Path("/home/u/src/todo/lib/main.dart"))
    assert not is_vendored(Path("/home/u/mcp-servers/session-autopsy/x.py"))


def test_session_artifact() -> None:
    assert is_session_artifact(Path("/home/u/r/docs/superpowers/plans/a.md"))
    assert not is_session_artifact(Path("/home/u/r/docs/README.md"))