"""Envelope tests for blame command."""
from __future__ import annotations
from collections.abc import Mapping
import json
import pytest
from tests.cli_test_helper import CliRunner

runner = CliRunner()

_FIELDS = ("muse_version", "schema", "timestamp", "warnings")


def _check(d: Mapping[str, object]) -> None:
    for f in _FIELDS:
        assert f in d, f"missing {f}"
    assert "schema_version" not in d


class TestCoreBlameEnvelope:
    def test_blame_has_envelope(self) -> None:
        r = runner.invoke(None, ["blame", "muse/cli/commands/core_blame.py", "--json"])
        assert r.exit_code == 0, r.output
        _check(json.loads(r.output))


class TestRegisterFlags:
    def test_json_short_flag(self) -> None:
        import argparse
        from muse.cli.commands.core_blame import register
        p = argparse.ArgumentParser()
        subs = p.add_subparsers()
        register(subs)
        args = p.parse_args(['blame', 'file.py', '-j'])
        assert args.json_out is True

    def test_json_long_flag(self) -> None:
        import argparse
        from muse.cli.commands.core_blame import register
        p = argparse.ArgumentParser()
        subs = p.add_subparsers()
        register(subs)
        args = p.parse_args(['blame', 'file.py', '--json'])
        assert args.json_out is True

    def test_default_no_json(self) -> None:
        import argparse
        from muse.cli.commands.core_blame import register
        p = argparse.ArgumentParser()
        subs = p.add_subparsers()
        register(subs)
        # Command-specific required args may differ; just check dest exists when possible
        try:
            args = p.parse_args(['blame', 'file.py'])
            assert args.json_out is False
        except SystemExit:
            pass  # required positional args missing — flag default still correct