"""Tests for CLI entry point."""

from __future__ import annotations

import contextlib
import sys
from pathlib import Path
from unittest import mock

import pytest

from volumen import VERSION
from volumen.cli import main


class TestVersionCommand:
    def test_version_output(self, capsys: pytest.CaptureFixture[str]) -> None:
        with (
            mock.patch.object(sys, "argv", ["volumen", "version"]),
            contextlib.suppress(SystemExit),
        ):
            main()
        captured = capsys.readouterr()
        assert VERSION in captured.out


class TestHelpCommand:
    def test_help_output(self, capsys: pytest.CaptureFixture[str]) -> None:
        with mock.patch.object(sys, "argv", ["volumen", "--help"]), contextlib.suppress(SystemExit):
            main()
        captured = capsys.readouterr()
        assert "volumen" in captured.out or "usage" in captured.out.lower()


class TestUnknownCommand:
    def test_unknown_command_exits(self) -> None:
        with mock.patch.object(sys, "argv", ["volumen", "bogus"]), pytest.raises(SystemExit):
            main()


class TestParseServeOptions:
    def test_parse_serve_defaults(self) -> None:
        with mock.patch.object(sys, "argv", ["volumen", "serve"]):
            import argparse

            parser = argparse.ArgumentParser()
            sp = parser.add_subparsers(dest="command")
            sp_serve = sp.add_parser("serve")
            sp_serve.add_argument("--config", default="/etc/volumen/config.toml")
            sp_serve.add_argument("--host", default=None)
            sp_serve.add_argument("--port", type=int, default=None)
            sp_serve.add_argument("--content", default=None)
            args = parser.parse_args(["serve"])
            assert args.config == "/etc/volumen/config.toml"

    def test_parse_serve_overrides(self) -> None:
        import argparse

        parser = argparse.ArgumentParser()
        sp = parser.add_subparsers(dest="command")
        sp_serve = sp.add_parser("serve")
        sp_serve.add_argument("--config", default="/etc/volumen/config.toml")
        sp_serve.add_argument("--host", default=None)
        sp_serve.add_argument("--port", type=int, default=None)
        sp_serve.add_argument("--content", default=None)
        args = parser.parse_args(
            ["serve", "--config", "/t.toml", "--host", "127.0.0.1", "--port", "9000"]
        )
        assert args.config == "/t.toml"
        assert args.host == "127.0.0.1"
        assert args.port == 9000


class TestPrepareConfig:
    def test_prepare_config_writes_template(self, tmp_path: Path) -> None:
        from volumen.config import Config

        path = tmp_path / "config.toml"
        result = Config.generate_default(str(path))
        assert result == str(path)
        assert path.exists()

    def test_prepare_config_noops_when_present(self, tmp_path: Path) -> None:
        from volumen.config import Config

        path = tmp_path / "config.toml"
        path.write_text("[server]\nport = 1\n")
        result = Config.generate_default(str(path))
        assert result is None