from __future__ import annotations

import subprocess
import sys
import unittest
from pathlib import Path


ROOT = Path(__file__).resolve().parents[1]


def _run(*args: str) -> subprocess.CompletedProcess[str]:
    return subprocess.run(
        [sys.executable, *args],
        cwd=ROOT,
        text=True,
        capture_output=True,
        check=False,
    )


class CliTests(unittest.TestCase):
    def test_wrapper_help_works(self):
        proc = _run("RFG_ADC_dataplotter.py", "--help")
        self.assertEqual(proc.returncode, 0)
        self.assertIn("usage:", proc.stdout)
        self.assertIn("--peak_search", proc.stdout)

    def test_module_help_works(self):
        proc = _run("-m", "rfg_adc_plotter.main", "--help")
        self.assertEqual(proc.returncode, 0)
        self.assertIn("usage:", proc.stdout)
        self.assertIn("--parser_16_bit_x2", proc.stdout)

    def test_backend_mpl_reports_removal(self):
        proc = _run("-m", "rfg_adc_plotter.main", "/dev/null", "--backend", "mpl")
        self.assertNotEqual(proc.returncode, 0)
        self.assertIn("Matplotlib backend removed", proc.stderr)


if __name__ == "__main__":
    unittest.main()