from __future__ import annotations

from unittest.mock import patch

from ameba_control_panel.services.settings_service import Settings


class TestSettings:
    def test_defaults(self, tmp_path):
        with patch("ameba_control_panel.services.settings_service.app_data_dir", return_value=tmp_path):
            s = Settings()
        assert s.font_size == 10
        assert s.default_baud == 1_500_000
        assert s.log_tail_lines == 100_000
        assert s.port_scan_interval_sec == 5
        assert s.partial_line_hold_ms == 300

    def test_set_and_persist(self, tmp_path):
        with patch("ameba_control_panel.services.settings_service.app_data_dir", return_value=tmp_path):
            s = Settings()
            s.font_size = 14
            s.default_baud = 115200
            s.save()

        with patch("ameba_control_panel.services.settings_service.app_data_dir", return_value=tmp_path):
            s2 = Settings()
        assert s2.font_size == 14
        assert s2.default_baud == 115200

    def test_corrupt_file_uses_defaults(self, tmp_path):
        (tmp_path / "settings.json").write_text("not json!", encoding="utf-8")
        with patch("ameba_control_panel.services.settings_service.app_data_dir", return_value=tmp_path):
            s = Settings()
        assert s.font_size == 10