#!/usr/bin/env python3

import argparse
import subprocess
import tempfile
import unittest
from pathlib import Path


SERVER: Path


def run_server(*arguments: str) -> subprocess.CompletedProcess[bytes]:
    return subprocess.run(
        [str(SERVER), *arguments],
        input=b"",
        capture_output=True,
        check=False,
        timeout=5,
    )


class CliStartupTest(unittest.TestCase):
    def test_help_uses_real_newlines(self) -> None:
        result = run_server("--help")
        self.assertEqual(0, result.returncode)
        self.assertIn(b"\n\nOptions:\n", result.stdout)
        self.assertNotIn(b"\\n", result.stdout)

    def test_invalid_threads_return_argument_error(self) -> None:
        for argument in ("--threads=", "--threads=-1", "--threads=12junk"):
            with self.subTest(argument=argument):
                result = run_server(argument)
                self.assertEqual(2, result.returncode)
                self.assertIn(b"--threads", result.stderr)
                self.assertNotIn(b"TSL-LSP server starting", result.stderr)

    def test_removed_stdout_flag_is_rejected(self) -> None:
        result = run_server("--log-stdout")
        self.assertEqual(2, result.returncode)
        self.assertEqual(b"", result.stdout)

    def test_default_logger_never_writes_stdout(self) -> None:
        result = run_server()
        self.assertEqual(1, result.returncode)
        self.assertEqual(b"", result.stdout)
        self.assertIn(b"TSL-LSP server starting", result.stderr)

    def test_log_file_failure_is_controlled(self) -> None:
        with tempfile.TemporaryDirectory() as temp_dir:
            result = run_server(f"--log-file={temp_dir}")
        self.assertEqual(1, result.returncode)
        self.assertIn(b"Failed to initialize logger", result.stderr)


if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument("--server", type=Path, required=True)
    args, unittest_args = parser.parse_known_args()
    SERVER = args.server.resolve()
    unittest.main(argv=[__file__, *unittest_args])