"""Tests for tools/typing_audit.py — the zero-tolerance typing enforcer.

Covers every check the audit makes, the self-auditing invariant (the script
passes its own rules), string-literal masking, CLI flags, and the ratchet.

All tests are pure-unit — no file-system access beyond tmp_path fixtures,
no network, no subprocess (we import the module directly).
"""

from __future__ import annotations

import json
import sys
from pathlib import Path

import pytest

# ── Import the tool under test ──────────────────────────────────────────────
# tools/ is not on sys.path by default; add it so we can import directly.
_TOOLS_DIR = Path(__file__).parent.parent / "tools"
if str(_TOOLS_DIR) not in sys.path:
    sys.path.insert(0, str(_TOOLS_DIR))

from typing_audit import (  # noqa: E402
    FileResult,
    Offender,
    Report,
    ReportSummary,
    UntypedDef,
    _classify_type_ignore,
    _find_untyped_defs,
    _imports_any,
    _mask_string_literals,
    generate_report,
    print_human_summary,
    scan_file,
    scan_directory,
)

type _PatternsMap = dict[str, int]

# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------


def _write(tmp_path: Path, name: str, content: str) -> Path:
    """Write *content* to ``tmp_path/name`` and return the path."""
    p = tmp_path / name
    p.write_text(content, encoding="utf-8")
    return p


def _scan(content: str, tmp_path: Path) -> FileResult:
    """Write *content* to a temp file, scan it, and return the result."""
    p = _write(tmp_path, "subject.py", content)
    result = scan_file(p)
    assert result is not None, "scan_file returned None for a valid file"
    return result


def _total(result: FileResult) -> int:
    """Return total violation count for *result*."""
    return sum(result["patterns"].values())


# ---------------------------------------------------------------------------
# Self-auditing invariant
# ---------------------------------------------------------------------------


class TestSelfAudit:
    """The audit script itself must pass its own zero-violation ratchet."""

    def test_tool_has_zero_violations(self) -> None:
        """tools/typing_audit.py passes --max-any 0 on itself."""
        tool_path = _TOOLS_DIR / "typing_audit.py"
        result = scan_file(tool_path)
        assert result is not None
        total = sum(result["patterns"].values())
        assert total == 0, (
            f"typing_audit.py has {total} violation(s): "
            f"{result['patterns']}"
        )

    def test_tool_has_zero_untyped_defs(self) -> None:
        """Every function in the tool has full type annotations."""
        tool_path = _TOOLS_DIR / "typing_audit.py"
        result = scan_file(tool_path)
        assert result is not None
        assert result["untyped_defs"] == [], (
            f"Untyped defs found in typing_audit.py: {result['untyped_defs']}"
        )


# ---------------------------------------------------------------------------
# String-literal masking
# ---------------------------------------------------------------------------


class TestMaskStringLiterals:
    """_mask_string_literals removes string content without altering structure."""

    def test_single_quoted_string_is_blanked(self) -> None:
        src = 'x = "hello: Any world"'
        masked = _mask_string_literals(src)
        assert "Any" not in masked

    def test_raw_string_is_blanked(self) -> None:
        src = r'pat = re.compile(r":\s*Any\b")'
        masked = _mask_string_literals(src)
        assert "Any" not in masked

    def test_newlines_are_preserved_in_multiline_string(self) -> None:
        src = '"""line one\nline two\nline three"""\nx = 1'
        masked = _mask_string_literals(src)
        assert masked.count("\n") == src.count("\n")

    def test_code_outside_strings_is_preserved(self) -> None:
        src = 'x: dict[str, int] = {}'
        masked = _mask_string_literals(src)
        assert "dict[str, int]" in masked

    def test_comment_not_masked(self) -> None:
        """Comments are not string literals — they survive masking."""
        src = 'x = 1  # type: ignore'
        masked = _mask_string_literals(src)
        assert "type: ignore" in masked

    def test_docstring_content_masked(self) -> None:
        src = '"""This function uses dict[str, Any] for convenience."""\ndef f(): ...'
        masked = _mask_string_literals(src)
        assert "Any" not in masked

    def test_pattern_in_string_does_not_trigger_violation(
        self, tmp_path: Path
    ) -> None:
        """A string literal containing 'Any' must not count as a violation."""
        result = _scan('x = "param: Any"\n', tmp_path)
        assert _total(result) == 0

    def test_raw_regex_pattern_does_not_trigger_violation(
        self, tmp_path: Path
    ) -> None:
        """Raw regex strings like r':\\s*Any\\b' must not count as violations."""
        result = _scan('import re\npat = re.compile(r":\\s*Any\\b")\n', tmp_path)
        assert _total(result) == 0


# ---------------------------------------------------------------------------
# _imports_any
# ---------------------------------------------------------------------------


class TestImportsAny:
    def test_detects_direct_any_import(self) -> None:
        assert _imports_any("from typing import Any\n")

    def test_detects_any_among_other_imports(self) -> None:
        assert _imports_any("from typing import List, Any, Dict\n")

    def test_does_not_flag_non_any_import(self) -> None:
        assert not _imports_any("from typing import Optional\n")

    def test_does_not_flag_any_in_comment(self) -> None:
        assert not _imports_any("# from typing import Any\n")


# ---------------------------------------------------------------------------
# _classify_type_ignore
# ---------------------------------------------------------------------------


class TestClassifyTypeIgnore:
    def test_blanket_ignore(self) -> None:
        assert _classify_type_ignore("x = 1  # type: ignore") == "type_ignore[blanket]"

    def test_specific_ignore(self) -> None:
        assert _classify_type_ignore("x = 1  # type: ignore[attr-defined]") == "type_ignore[attr-defined]"

    def test_multiple_codes_returned_as_is(self) -> None:
        label = _classify_type_ignore("x = 1  # type: ignore[union-attr, arg-type]")
        assert "union-attr" in label


# ---------------------------------------------------------------------------
# Any-as-type patterns
# ---------------------------------------------------------------------------


class TestAnyPatterns:
    def test_dict_str_any(self, tmp_path: Path) -> None:
        result = _scan("def f() -> dict[str, Any]: ...\n", tmp_path)
        assert result["patterns"].get("dict_str_any", 0) >= 1

    def test_list_any(self, tmp_path: Path) -> None:
        result = _scan("def f() -> list[Any]: ...\n", tmp_path)
        assert result["patterns"].get("list_any", 0) >= 1

    def test_return_any(self, tmp_path: Path) -> None:
        result = _scan("def f() -> Any: ...\n", tmp_path)
        assert result["patterns"].get("return_any", 0) >= 1

    def test_param_any(self, tmp_path: Path) -> None:
        result = _scan("def f(x: Any) -> None: ...\n", tmp_path)
        assert result["patterns"].get("param_any", 0) >= 1

    def test_mapping_any(self, tmp_path: Path) -> None:
        result = _scan("def f(x: Mapping[str, Any]) -> None: ...\n", tmp_path)
        assert result["patterns"].get("mapping_any", 0) >= 1

    def test_tuple_any(self, tmp_path: Path) -> None:
        result = _scan("x: tuple[int, Any] = (1, 2)\n", tmp_path)
        assert result["patterns"].get("tuple_any", 0) >= 1

    def test_any_in_docstring_not_flagged(self, tmp_path: Path) -> None:
        """Any inside docstrings must not be counted."""
        src = '"""Accepts dict[str, Any] for flexibility."""\ndef f() -> None: ...\n'
        result = _scan(src, tmp_path)
        assert result["patterns"].get("dict_str_any", 0) == 0


# ---------------------------------------------------------------------------
# object-as-type patterns
# ---------------------------------------------------------------------------


class TestObjectPatterns:
    def test_param_object(self, tmp_path: Path) -> None:
        result = _scan("def f(x: object) -> None: ...\n", tmp_path)
        assert result["patterns"].get("param_object", 0) >= 1

    def test_return_object(self, tmp_path: Path) -> None:
        result = _scan("def f() -> object: ...\n", tmp_path)
        assert result["patterns"].get("return_object", 0) >= 1

    def test_collection_object(self, tmp_path: Path) -> None:
        result = _scan("x: list[object] = []\n", tmp_path)
        assert result["patterns"].get("collection_object", 0) >= 1


# ---------------------------------------------------------------------------
# cast() — banned
# ---------------------------------------------------------------------------


class TestCastUsage:
    def test_cast_flagged(self, tmp_path: Path) -> None:
        result = _scan("from typing import cast\ny = cast(int, x)\n", tmp_path)
        assert result["patterns"].get("cast_usage", 0) >= 1


# ---------------------------------------------------------------------------
# type: ignore
# ---------------------------------------------------------------------------


class TestTypeIgnore:
    def test_bare_type_ignore_flagged(self, tmp_path: Path) -> None:
        result = _scan("x: int = y  # type: ignore\n", tmp_path)
        assert result["patterns"].get("type_ignore", 0) >= 1

    def test_specific_type_ignore_not_flagged(self, tmp_path: Path) -> None:
        """Code-specific ignores like type: ignore[assignment] are acceptable — not flagged."""
        result = _scan("x: int = y  # type: ignore[assignment]\n", tmp_path)
        assert result["patterns"].get("type_ignore", 0) == 0

    def test_type_ignore_in_string_not_flagged(self, tmp_path: Path) -> None:
        """The text '# type: ignore' inside a print string is not a comment."""
        result = _scan('print("use # type: ignore sparingly")\n', tmp_path)
        assert result["patterns"].get("type_ignore", 0) == 0

    def test_type_ignore_variant_classified(self, tmp_path: Path) -> None:
        result = _scan("x = 1  # type: ignore\n", tmp_path)
        assert result["type_ignore_variants"].get("type_ignore[blanket]", 0) >= 1

    def test_specific_variant_not_classified(self, tmp_path: Path) -> None:
        """Code-specific ignores don't match the blanket pattern — variants dict stays empty."""
        result = _scan("x = 1  # type: ignore[attr-defined]\n", tmp_path)
        assert result["type_ignore_variants"].get("type_ignore[attr-defined]", 0) == 0


# ---------------------------------------------------------------------------
# Bare collections
# ---------------------------------------------------------------------------


class TestBareCollections:
    def test_bare_list_in_annotation(self, tmp_path: Path) -> None:
        result = _scan("def f() -> list: ...\n", tmp_path)
        assert result["patterns"].get("bare_list", 0) >= 1

    def test_bare_dict_in_annotation(self, tmp_path: Path) -> None:
        result = _scan("def f() -> dict: ...\n", tmp_path)
        assert result["patterns"].get("bare_dict", 0) >= 1

    def test_bare_set_in_annotation(self, tmp_path: Path) -> None:
        result = _scan("x: set = set()\n", tmp_path)
        assert result["patterns"].get("bare_set", 0) >= 1

    def test_bare_tuple_in_annotation(self, tmp_path: Path) -> None:
        result = _scan("x: tuple = (1, 2)\n", tmp_path)
        assert result["patterns"].get("bare_tuple", 0) >= 1

    def test_parameterised_list_not_flagged(self, tmp_path: Path) -> None:
        result = _scan("def f() -> list[int]: ...\n", tmp_path)
        assert result["patterns"].get("bare_list", 0) == 0

    def test_parameterised_dict_not_flagged(self, tmp_path: Path) -> None:
        result = _scan("x: dict[str, int] = {}\n", tmp_path)
        assert result["patterns"].get("bare_dict", 0) == 0


# ---------------------------------------------------------------------------
# Optional / Union (legacy)
# ---------------------------------------------------------------------------


class TestOptionalUnion:
    def test_optional_usage_flagged(self, tmp_path: Path) -> None:
        result = _scan("def f(x: Optional[int]) -> None: ...\n", tmp_path)
        assert result["patterns"].get("optional_usage", 0) >= 1

    def test_union_usage_flagged(self, tmp_path: Path) -> None:
        result = _scan("def f(x: Union[int, str]) -> None: ...\n", tmp_path)
        assert result["patterns"].get("union_usage", 0) >= 1

    def test_pipe_union_not_flagged(self, tmp_path: Path) -> None:
        result = _scan("def f(x: int | str) -> None: ...\n", tmp_path)
        assert _total(result) == 0

    def test_x_or_none_not_flagged(self, tmp_path: Path) -> None:
        result = _scan("def f(x: int | None) -> None: ...\n", tmp_path)
        assert _total(result) == 0


# ---------------------------------------------------------------------------
# Legacy typing imports
# ---------------------------------------------------------------------------


class TestLegacyImports:
    def test_legacy_List_flagged(self, tmp_path: Path) -> None:
        result = _scan("from typing import List\nx: List[int] = []\n", tmp_path)
        assert result["patterns"].get("legacy_List", 0) >= 1

    def test_legacy_Dict_flagged(self, tmp_path: Path) -> None:
        result = _scan("from typing import Dict\nx: Dict[str, int] = {}\n", tmp_path)
        assert result["patterns"].get("legacy_Dict", 0) >= 1

    def test_legacy_Set_flagged(self, tmp_path: Path) -> None:
        result = _scan("from typing import Set\nx: Set[int] = set()\n", tmp_path)
        assert result["patterns"].get("legacy_Set", 0) >= 1

    def test_legacy_Tuple_flagged(self, tmp_path: Path) -> None:
        result = _scan("from typing import Tuple\nx: Tuple[int, str] = (1, 'a')\n", tmp_path)
        assert result["patterns"].get("legacy_Tuple", 0) >= 1


# ---------------------------------------------------------------------------
# Callable patterns (new in rewrite)
# ---------------------------------------------------------------------------


class TestCallablePatterns:
    def test_bare_callable_in_annotation_flagged(self, tmp_path: Path) -> None:
        result = _scan("def f(cb: Callable) -> None: ...\n", tmp_path)
        assert result["patterns"].get("bare_callable", 0) >= 1

    def test_bare_callable_as_return_flagged(self, tmp_path: Path) -> None:
        result = _scan("def f() -> Callable: ...\n", tmp_path)
        assert result["patterns"].get("bare_callable", 0) >= 1

    def test_callable_returning_any_flagged(self, tmp_path: Path) -> None:
        result = _scan("def f(cb: Callable[[int], Any]) -> None: ...\n", tmp_path)
        assert result["patterns"].get("callable_any", 0) >= 1

    def test_callable_with_full_signature_not_flagged(self, tmp_path: Path) -> None:
        result = _scan("def f(cb: Callable[[int], str]) -> None: ...\n", tmp_path)
        assert result["patterns"].get("bare_callable", 0) == 0
        assert result["patterns"].get("callable_any", 0) == 0


# ---------------------------------------------------------------------------
# Untyped varargs (new in rewrite)
# ---------------------------------------------------------------------------


class TestVarargsPatterns:
    def test_args_any_flagged(self, tmp_path: Path) -> None:
        result = _scan("def f(*args: Any) -> None: ...\n", tmp_path)
        assert result["patterns"].get("varargs_any", 0) >= 1

    def test_kwargs_any_flagged(self, tmp_path: Path) -> None:
        result = _scan("def f(**kwargs: Any) -> None: ...\n", tmp_path)
        assert result["patterns"].get("varargs_any", 0) >= 1

    def test_typed_args_not_flagged(self, tmp_path: Path) -> None:
        result = _scan("def f(*args: int) -> None: ...\n", tmp_path)
        assert result["patterns"].get("varargs_any", 0) == 0

    def test_typed_kwargs_not_flagged(self, tmp_path: Path) -> None:
        result = _scan("def f(**kwargs: str) -> None: ...\n", tmp_path)
        assert result["patterns"].get("varargs_any", 0) == 0

    def test_varargs_any_in_string_not_flagged(self, tmp_path: Path) -> None:
        result = _scan('x = "*args: Any is bad"\n', tmp_path)
        assert result["patterns"].get("varargs_any", 0) == 0


# ---------------------------------------------------------------------------
# _find_untyped_defs (AST-based)
# ---------------------------------------------------------------------------


class TestFindUntypedDefs:
    def test_missing_return_type(self) -> None:
        src = "def f():\n    pass\n"
        defs = _find_untyped_defs(src, "x.py")
        assert any(d["issue"] == "missing_return_type" for d in defs)

    def test_missing_param_type(self) -> None:
        src = "def f(x) -> None:\n    pass\n"
        defs = _find_untyped_defs(src, "x.py")
        assert any(d["issue"] == "missing_param_type" and "x" in d["name"] for d in defs)

    def test_self_excluded(self) -> None:
        src = "class C:\n    def f(self) -> None:\n        pass\n"
        defs = _find_untyped_defs(src, "x.py")
        assert not any("self" in d["name"] for d in defs)

    def test_cls_excluded(self) -> None:
        src = "class C:\n    @classmethod\n    def f(cls) -> None:\n        pass\n"
        defs = _find_untyped_defs(src, "x.py")
        assert not any("cls" in d["name"] for d in defs)

    def test_fully_typed_function_has_no_violations(self) -> None:
        src = "def f(x: int, y: str) -> bool:\n    return True\n"
        defs = _find_untyped_defs(src, "x.py")
        assert defs == []

    def test_args_any_detected(self) -> None:
        src = "def f(*args: Any) -> None:\n    pass\n"
        defs = _find_untyped_defs(src, "x.py")
        issues = [d["issue"] for d in defs]
        assert "untyped_args" in issues

    def test_kwargs_any_detected(self) -> None:
        src = "def f(**kwargs: Any) -> None:\n    pass\n"
        defs = _find_untyped_defs(src, "x.py")
        issues = [d["issue"] for d in defs]
        assert "untyped_kwargs" in issues

    def test_syntax_error_returns_empty(self) -> None:
        assert _find_untyped_defs("def f(: pass", "x.py") == []

    def test_posonly_arg_without_annotation_flagged(self) -> None:
        src = "def f(x, /, y: int) -> None:\n    pass\n"
        defs = _find_untyped_defs(src, "x.py")
        assert any("x" in d["name"] for d in defs)

    def test_kwonly_arg_without_annotation_flagged(self) -> None:
        src = "def f(*, x) -> None:\n    pass\n"
        defs = _find_untyped_defs(src, "x.py")
        assert any("x" in d["name"] for d in defs)


# ---------------------------------------------------------------------------
# scan_file edge cases
# ---------------------------------------------------------------------------


class TestScanFile:
    def test_returns_none_for_missing_file(self, tmp_path: Path) -> None:
        assert scan_file(tmp_path / "nonexistent.py") is None

    def test_clean_file_has_zero_violations(self, tmp_path: Path) -> None:
        result = _scan("def f(x: int) -> str:\n    return str(x)\n", tmp_path)
        assert _total(result) == 0

    def test_file_path_in_result(self, tmp_path: Path) -> None:
        p = _write(tmp_path, "check.py", "x = 1\n")
        result = scan_file(p)
        assert result is not None
        assert result["file"] == str(p)

    def test_imports_any_detected(self, tmp_path: Path) -> None:
        result = _scan("from typing import Any\nx: Any = 1\n", tmp_path)
        assert result["imports_any"] is True

    def test_imports_any_false_for_no_any(self, tmp_path: Path) -> None:
        result = _scan("x: int = 1\n", tmp_path)
        assert result["imports_any"] is False

    def test_multiple_violations_in_same_line(self, tmp_path: Path) -> None:
        result = _scan("def f(x: Any) -> Any: ...\n", tmp_path)
        assert _total(result) >= 2

    def test_blank_and_comment_lines_skipped(self, tmp_path: Path) -> None:
        """Blank lines and pure comments must not contribute to any violation."""
        src = "\n# This has Any in a comment: Any\n\nx: int = 1\n"
        result = _scan(src, tmp_path)
        assert _total(result) == 0


# ---------------------------------------------------------------------------
# scan_directory
# ---------------------------------------------------------------------------


class TestScanDirectory:
    def test_scans_all_py_files(self, tmp_path: Path) -> None:
        _write(tmp_path, "a.py", "x: int = 1\n")
        _write(tmp_path, "b.py", "def f() -> None: ...\n")
        results = scan_directory(tmp_path)
        assert len(results) == 2

    def test_skips_venv(self, tmp_path: Path) -> None:
        venv = tmp_path / "venv"
        venv.mkdir()
        _write(venv, "bad.py", "x: Any = 1\n")
        _write(tmp_path, "good.py", "x: int = 1\n")
        results = scan_directory(tmp_path)
        assert len(results) == 1

    def test_skips_pycache(self, tmp_path: Path) -> None:
        cache = tmp_path / "__pycache__"
        cache.mkdir()
        _write(cache, "cached.py", "x: Any = 1\n")
        _write(tmp_path, "real.py", "x: int = 1\n")
        results = scan_directory(tmp_path)
        assert len(results) == 1

    def test_empty_directory(self, tmp_path: Path) -> None:
        results = scan_directory(tmp_path)
        assert results == []


# ---------------------------------------------------------------------------
# generate_report
# ---------------------------------------------------------------------------


class TestGenerateReport:
    def _make_result(
        self,
        file: str = "x.py",
        patterns: _PatternsMap | None = None,
        imports_any: bool = False,
    ) -> FileResult:
        return FileResult(
            file=file,
            imports_any=imports_any,
            patterns=patterns or {},
            pattern_lines={},
            type_ignore_variants={},
            untyped_defs=[],
        )

    def test_empty_results_produce_zero_totals(self) -> None:
        report = generate_report([])
        assert report["summary"]["total_any_patterns"] == 0
        assert report["summary"]["total_files_scanned"] == 0

    def test_total_counts_aggregated(self) -> None:
        r1 = self._make_result("a.py", {"param_any": 2})
        r2 = self._make_result("b.py", {"return_any": 3})
        report = generate_report([r1, r2])
        assert report["summary"]["total_any_patterns"] == 5

    def test_top_offenders_sorted_descending(self) -> None:
        r1 = self._make_result("low.py", {"param_any": 1})
        r2 = self._make_result("high.py", {"param_any": 10})
        report = generate_report([r1, r2])
        assert report["top_offenders"][0]["file"] == "high.py"

    def test_files_importing_any_counted(self) -> None:
        r1 = self._make_result("a.py", imports_any=True)
        r2 = self._make_result("b.py", imports_any=False)
        report = generate_report([r1, r2])
        assert report["summary"]["files_importing_any"] == 1

    def test_per_file_only_includes_violating_files(self) -> None:
        r1 = self._make_result("clean.py", {})
        r2 = self._make_result("dirty.py", {"param_any": 1})
        report = generate_report([r1, r2])
        assert "clean.py" not in report["per_file"]
        assert "dirty.py" in report["per_file"]

    def test_report_is_serialisable_to_json(self) -> None:
        r = self._make_result("x.py", {"param_any": 1})
        report = generate_report([r])
        serialised = json.dumps(report)
        loaded = json.loads(serialised)
        assert loaded["summary"]["total_any_patterns"] == 1

    def test_type_ignore_variants_aggregated(self) -> None:
        r = FileResult(
            file="x.py",
            imports_any=False,
            patterns={},
            pattern_lines={},
            type_ignore_variants={"type_ignore[blanket]": 3},
            untyped_defs=[],
        )
        report = generate_report([r])
        assert report["type_ignore_variants"]["type_ignore[blanket]"] == 3

    def test_untyped_defs_aggregated(self) -> None:
        ud = UntypedDef(file="x.py", line=1, name="f", issue="missing_return_type")
        r = FileResult(
            file="x.py",
            imports_any=False,
            patterns={},
            pattern_lines={},
            type_ignore_variants={},
            untyped_defs=[ud],
        )
        report = generate_report([r])
        assert report["summary"]["untyped_defs"] == 1
        assert len(report["untyped_defs"]) == 1


# ---------------------------------------------------------------------------
# print_human_summary (smoke test)
# ---------------------------------------------------------------------------


class TestPrintHumanSummary:
    def test_outputs_to_stdout(self, capsys: pytest.CaptureFixture[str]) -> None:
        r = FileResult(
            file="x.py",
            imports_any=True,
            patterns={"param_any": 2},
            pattern_lines={"param_any": [10, 20]},
            type_ignore_variants={},
            untyped_defs=[],
        )
        report = generate_report([r])
        print_human_summary(report)
        out = capsys.readouterr().out
        assert "TYPING AUDIT" in out
        assert "param_any" in out

    def test_no_violations_shows_none_label(
        self, capsys: pytest.CaptureFixture[str]
    ) -> None:
        report = generate_report([])
        print_human_summary(report)
        out = capsys.readouterr().out
        assert "(none)" in out

    def test_type_ignore_variants_shown(
        self, capsys: pytest.CaptureFixture[str]
    ) -> None:
        r = FileResult(
            file="x.py",
            imports_any=False,
            patterns={"type_ignore": 1},
            pattern_lines={"type_ignore": [5]},
            type_ignore_variants={"type_ignore[blanket]": 1},
            untyped_defs=[],
        )
        report = generate_report([r])
        print_human_summary(report)
        out = capsys.readouterr().out
        assert "type_ignore[blanket]" in out


# ---------------------------------------------------------------------------
# CLI (via main() directly, capturing SystemExit)
# ---------------------------------------------------------------------------


class TestCLI:
    def test_ratchet_passes_at_zero(self, tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
        _write(tmp_path, "clean.py", "def f(x: int) -> str:\n    return str(x)\n")
        monkeypatch.setattr(
            sys, "argv",
            ["typing_audit.py", "--dirs", str(tmp_path), "--max-any", "0"],
        )
        from typing_audit import main
        main()  # must not raise SystemExit

    def test_ratchet_fails_above_threshold(
        self, tmp_path: Path, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        _write(tmp_path, "dirty.py", "def f(x: Any) -> None: ...\n")
        monkeypatch.setattr(
            sys, "argv",
            ["typing_audit.py", "--dirs", str(tmp_path), "--max-any", "0"],
        )
        from typing_audit import main
        with pytest.raises(SystemExit) as exc:
            main()
        assert exc.value.code == 1

    def test_json_output_written(self, tmp_path: Path, monkeypatch: pytest.MonkeyPatch) -> None:
        _write(tmp_path, "src.py", "def f(x: int) -> str:\n    return str(x)\n")
        out_json = tmp_path / "report.json"
        monkeypatch.setattr(
            sys, "argv",
            ["typing_audit.py", "--dirs", str(tmp_path), "--json", str(out_json)],
        )
        from typing_audit import main
        main()
        assert out_json.exists()
        data = json.loads(out_json.read_text())
        assert "summary" in data

    def test_missing_dir_warns_but_does_not_crash(
        self, tmp_path: Path, monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]
    ) -> None:
        monkeypatch.setattr(
            sys, "argv",
            ["typing_audit.py", "--dirs", str(tmp_path / "nonexistent")],
        )
        from typing_audit import main
        main()  # must not raise
        err = capsys.readouterr().err
        assert "WARNING" in err

    def test_single_file_arg_accepted(
        self, tmp_path: Path, monkeypatch: pytest.MonkeyPatch
    ) -> None:
        p = _write(tmp_path, "single.py", "def f(x: int) -> None: ...\n")
        monkeypatch.setattr(
            sys, "argv",
            ["typing_audit.py", "--dirs", str(p), "--max-any", "0"],
        )
        from typing_audit import main
        main()  # single file path accepted and scanned


# ---------------------------------------------------------------------------
# TypedDict shape invariants
# ---------------------------------------------------------------------------


class TestTypedDictShapes:
    """Confirm that the TypedDicts have the exact keys callers depend on."""

    def test_file_result_has_required_keys(self, tmp_path: Path) -> None:
        result = _scan("x: int = 1\n", tmp_path)
        for key in ("file", "imports_any", "patterns", "pattern_lines",
                    "type_ignore_variants", "untyped_defs"):
            assert key in result, f"FileResult missing key: {key!r}"

    def test_report_has_required_keys(self) -> None:
        report = generate_report([])
        for key in ("summary", "pattern_totals", "type_ignore_variants",
                    "top_offenders", "per_file", "untyped_defs"):
            assert key in report, f"Report missing key: {key!r}"

    def test_summary_has_required_keys(self) -> None:
        report = generate_report([])
        for key in ("total_files_scanned", "files_importing_any",
                    "total_any_patterns", "untyped_defs"):
            assert key in report["summary"], f"ReportSummary missing key: {key!r}"