import java.io.IOException;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertTrue;
import org.junit.jupiter.api.Test;

import sd.config.SimulationConfig;
import sd.model.Intersection;
import sd.model.TrafficLight;
import sd.model.TrafficLightState;
import sd.model.Vehicle;
import sd.model.VehicleType;
import sd.util.VehicleGenerator;

/**
 * Basic tests for the simulation components.
 */
class SimulationTest {

    @Test
    void testConfigurationLoading() throws IOException {
        SimulationConfig config = new SimulationConfig("src/main/resources/simulation.properties");

        assertEquals(60.0, config.getSimulationDuration());
        assertEquals("POISSON", config.getArrivalModel());
        assertEquals(0.5, config.getArrivalRate());
        assertEquals(1.0, config.getStatisticsUpdateInterval());
    }

    @Test
    void testVehicleGeneration() throws IOException {
        SimulationConfig config = new SimulationConfig("src/main/resources/simulation.properties");
        VehicleGenerator generator = new VehicleGenerator(config);

        Vehicle vehicle = generator.generateVehicle("TEST1", 0.0);

        assertNotNull(vehicle);
        assertEquals("TEST1", vehicle.getId());
        assertNotNull(vehicle.getType());
        assertNotNull(vehicle.getRoute());
        assertTrue(!vehicle.getRoute().isEmpty());
    }

    @Test
    void testIntersectionVehicleQueue() {
        Intersection intersection = new Intersection("TestCr");
        TrafficLight light = new TrafficLight("TestCr-N", "North", 30.0, 30.0);

        intersection.addTrafficLight(light);

        Vehicle v1 = new Vehicle("V1", VehicleType.LIGHT, 0.0,
                java.util.Arrays.asList("TestCr", "S"));

        intersection.configureRoute("S", "North");

        // Advance route to next destination
        v1.advanceRoute();

        intersection.receiveVehicle(v1);

        assertEquals(1, intersection.getTotalQueueSize());
        assertEquals(1, intersection.getTotalVehiclesReceived());
    }

    @Test
    void testTrafficLightStateChange() {
        TrafficLight light = new TrafficLight("Test-Light", "North", 30.0, 30.0);

        assertEquals(TrafficLightState.RED, light.getState());

        light.changeState(TrafficLightState.GREEN);
        assertEquals(TrafficLightState.GREEN, light.getState());

        light.changeState(TrafficLightState.RED);
        assertEquals(TrafficLightState.RED, light.getState());
    }

    // Removed testSimulationEngineInitialization as SimulationEngine has been
    // removed.

}