import pytest
from unittest.mock import MagicMock, patch
from pygui.backend.controllers.session_controller import SessionController

@pytest.fixture
def controller():
    return SessionController()

def test_initial_default(controller):
    assert controller.mode == "review"
    assert controller.state == "idle"
    assert controller.recording == False

def test_playback_flow(controller):
    controller.loadFile("tests/fixtures/sample_stream.csv")
    controller.play()
    initial_index = controller.frameIndex
    controller._advance()
    assert controller.frameIndex == initial_index + 1

def test_speed_control(controller):
    controller.setSpeed(2.0)
    interval = controller._next_interval_ms()
    controller.setSpeed(0.5)
    assert controller._next_interval_ms() > interval

def test_seek(controller):
    controller.loadFile("tests/fixtures/sample_stream.csv")
    controller.seek(1)
    assert controller.frameIndex == 1

def test_step_forward(controller):
    controller.loadFile("tests/fixtures/sample_stream.csv")
    initial = controller.frameIndex
    controller.step(1)
    assert controller.frameIndex == initial + 1

def test_step_backward(controller):
    controller.loadFile("tests/fixtures/sample_stream.csv")
    controller.seek(2)
    controller.step(-1)
    assert controller.frameIndex == 1

def test_pause_stop_timer(controller):
    controller.loadFile("tests/fixtures/sample_stream.csv")
    controller.seek(2)
    controller.stop()
    assert controller.frameIndex == 0

def test_compare_files_integration(controller):
    # Mock the comparisonResult signal
    mock_slot = MagicMock()
    controller.comparisonResult.connect(mock_slot)

    # Use sample_stream.csv for both arguments to test identical files compare
    csv_path = "tests/fixtures/sample_stream.csv"
    controller.compareFiles(csv_path, csv_path)

    # Verify that the comparison signal is emitted with a success dict
    assert mock_slot.call_count == 1
    args = mock_slot.call_args[0][0]
    assert args["success"] is True
    assert "distance" in args
    assert "series_a" in args
    assert "series_b" in args
    assert args["frame_offset"] == 0

def test_comparison_result_reaches_qml(qapp, controller):
    """The result dict must arrive in QML as a real JS object with fields.

    Signal(object) delivers Python dicts to QML as an opaque empty wrapper;
    the signal must be declared with a dict/QVariantMap signature.
    """
    from PySide6.QtQml import QQmlApplicationEngine

    engine = QQmlApplicationEngine()
    engine.rootContext().setContextProperty("streamController", controller)
    engine.loadData(b"""
import QtQuick
Item {
    id: probe
    property bool gotSuccess: false
    property real gotDistance: -1
    Connections {
        target: streamController
        function onComparisonResult(result) {
            probe.gotSuccess = result.success === true
            probe.gotDistance = result.distance !== undefined ? result.distance : -1
        }
    }
}
""")
    assert engine.rootObjects(), "probe QML failed to load"
    root = engine.rootObjects()[0]

    csv_path = "tests/fixtures/sample_stream.csv"
    controller.compareFiles(csv_path, csv_path)
    qapp.processEvents()

    assert root.property("gotSuccess") is True
    assert root.property("gotDistance") >= 0

def test_recording_toggle(controller, tmp_path):
    csv_path = str(tmp_path / "rec" / "live_test.csv")
    controller.startRecording(csv_path, "SN123")
    assert controller.recording == True

    controller.stopRecording()
    assert controller.recording == False

    # Header written with wafer serial
    content = open(csv_path).read()
    assert "Wafer ID=SN123" in content

def test_resync_count_default(controller):
    # No active reader -> zero
    assert controller.resyncCount == 0

    controller._reader = MagicMock(resync_count=7)
    assert controller.resyncCount == 7
    controller._reader = None

def test_split_data_integration(controller):
    # Mock the splitResult signal
    mock_slot = MagicMock()
    controller.splitResult.connect(mock_slot)

    csv_path = "tests/fixtures/sample_stream.csv"
    controller.splitData(csv_path, 149.0)

    # Verify that the split signal is emitted
    assert mock_slot.call_count == 1
    args = mock_slot.call_args[0][0]
    assert args["success"] is True
    assert "segments" in args