from unittest.mock import MagicMock, patch
import pytest
from config.config_manager import ConfigManager
from core.switcher import MonitorSwitcher


@pytest.fixture
def config(tmp_path):
    return ConfigManager(tmp_path / "config.json")


def _make_mock_monitor():
    m = MagicMock()
    m.__enter__ = MagicMock(return_value=m)
    m.__exit__ = MagicMock(return_value=False)
    m.vcp = MagicMock()
    return m


def test_apply_profile_sends_vcp_to_both_monitors(config):
    mon0 = _make_mock_monitor()
    mon1 = _make_mock_monitor()

    with patch("core.switcher.get_monitors", return_value=[mon0, mon1]):
        sw = MonitorSwitcher(config)
        sw.apply_profile("pc1_dp")

    mon0.vcp.set_vcp_feature.assert_called_once_with(0x60, 15)
    mon1.vcp.set_vcp_feature.assert_called_once_with(0x60, 15)


def test_apply_profile_hdmi(config):
    mon0 = _make_mock_monitor()
    mon1 = _make_mock_monitor()

    with patch("core.switcher.get_monitors", return_value=[mon0, mon1]):
        sw = MonitorSwitcher(config)
        sw.apply_profile("pc2_hdmi")

    mon0.vcp.set_vcp_feature.assert_called_once_with(0x60, 17)
    mon1.vcp.set_vcp_feature.assert_called_once_with(0x60, 17)


def test_apply_profile_skips_missing_monitor(config):
    mon0 = _make_mock_monitor()

    with patch("core.switcher.get_monitors", return_value=[mon0]):
        sw = MonitorSwitcher(config)
        sw.apply_profile("pc1_dp")

    mon0.vcp.set_vcp_feature.assert_called_once_with(0x60, 15)


def test_apply_profile_continues_on_monitor_error(config):
    mon0 = _make_mock_monitor()
    mon1 = _make_mock_monitor()
    mon0.vcp.set_vcp_feature.side_effect = Exception("DDC/CI error")

    with patch("core.switcher.get_monitors", return_value=[mon0, mon1]):
        sw = MonitorSwitcher(config)
        sw.apply_profile("pc1_dp")

    mon1.vcp.set_vcp_feature.assert_called_once_with(0x60, 15)


def test_apply_profile_unknown_profile_does_nothing(config):
    with patch("core.switcher.get_monitors", return_value=[]) as mock_gm:
        sw = MonitorSwitcher(config)
        sw.apply_profile("nonexistent")
    mock_gm.assert_not_called()


def test_on_switch_callback_fires(config):
    mon0 = _make_mock_monitor()
    mon1 = _make_mock_monitor()
    received = []

    with patch("core.switcher.get_monitors", return_value=[mon0, mon1]):
        sw = MonitorSwitcher(config)
        sw.on_switch(lambda pid: received.append(pid))
        sw.apply_profile("pc2_hdmi")

    assert received == ["pc2_hdmi"]


def test_apply_profile_updates_active_profile(config):
    mon0 = _make_mock_monitor()
    mon1 = _make_mock_monitor()

    with patch("core.switcher.get_monitors", return_value=[mon0, mon1]):
        sw = MonitorSwitcher(config)
        sw.apply_profile("pc2_hdmi")

    assert config.get_active_profile_id() == "pc2_hdmi"