"""Tests for search_files auto-multiline routing on \\n patterns."""

import json

import pytest

from tools.file_tools import search_tool


@pytest.fixture
def proj(tmp_path, monkeypatch):
    monkeypatch.setenv("HERMES_HOME", str(tmp_path / ".hermes"))
    d = tmp_path / "proj"
    d.mkdir()
    (d / "mod.py").write_text(
        "def setup():\n    init_db()\n    return True\n\n"
        "def teardown():\n    close_db()\n"
    )
    return d


class TestAutoMultiline:
    def test_newline_regex_matches_across_lines(self, proj):
        r = json.loads(search_tool(r"def setup\(\):\n    init_db\(\)", path=str(proj), task_id="t-ml"))
        assert "error" not in r
        assert r["total_count"] >= 1
        assert "multiline" in r.get("warning", "")

    def test_literal_newline_in_pattern_matches(self, proj):
        # A raw newline in the pattern (not the \n escape) also routes to
        # multiline mode. Keep the pattern free of regex metachars.
        r = json.loads(search_tool("return True\n\ndef teardown", path=str(proj), task_id="t-ml"))
        assert "error" not in r
        assert r["total_count"] >= 1

    def test_plain_pattern_unaffected(self, proj):
        r = json.loads(search_tool("init_db", path=str(proj), task_id="t-ml"))
        assert r["total_count"] == 1
        assert "multiline" not in r.get("warning", "")

    def test_escaped_backslash_n_stays_literal(self, proj):
        # \\n = literal backslash+n search, not a newline: no multiline mode.
        (proj / "strings.py").write_text('SEP = "a\\\\nb"\n')
        r = json.loads(search_tool(r"a\\nb", path=str(proj), task_id="t-ml"))
        assert "error" not in r
        assert "multiline" not in (r.get("warning") or "")

    def test_multiline_zero_match_is_clean(self, proj):
        r = json.loads(search_tool(r"def missing\(\):\n    nope\(\)", path=str(proj), task_id="t-ml"))
        assert "error" not in r
        assert r["total_count"] == 0