package dev.kske.eventbus.core;

import static org.junit.jupiter.api.Assertions.*;

import org.junit.jupiter.api.*;

/**
 * Tests the dispatching mechanism of the event bus.
 *
 * @author Kai S. K. Engelbart
 * @since 0.0.1
 */
@Polymorphic
@Priority(150)
class DispatchTest {

	EventBus	bus;
	static int	hits;

	/**
	 * Constructs an event bus and registers this test instance as an event listener.
	 *
	 * @since 0.0.1
	 */
	@BeforeEach
	void registerListener() {
		bus = new EventBus();
		bus.registerListener(this);
	}

	/**
	 * Tests {@link EventBus#dispatch(Object)} with multiple handler priorities, a polymorphic
	 * handler and a static handler.
	 *
	 * @since 0.0.1
	 */
	@Test
	void testDispatch() {
		bus.dispatch(new SimpleEventSub());
		bus.dispatch(new SimpleEvent());
	}

	/**
	 * Tests {@link EventBus#printExecutionOrder(Class)} based on the currently registered handlers.
	 *
	 * @since 1.2.0
	 */
	@Test
	void testPrintExecutionOrder() {
		String executionOrder = bus.printExecutionOrder(SimpleEvent.class);
		System.out.println(executionOrder);
		assertEquals(
			"Event handler execution order for class dev.kske.eventbus.core.SimpleEvent (3 handler(s)):\n"
				+ "==========================================================================================\n"
				+ "EventHandler[method=void dev.kske.eventbus.core.DispatchTest.onSimpleEventFirst(), eventType=class dev.kske.eventbus.core.SimpleEvent, useParameter=false, polymorphic=true, priority=200]\n"
				+ "EventHandler[method=static void dev.kske.eventbus.core.DispatchTest.onSimpleEventSecond(), eventType=class dev.kske.eventbus.core.SimpleEvent, useParameter=false, polymorphic=false, priority=150]\n"
				+ "EventHandler[method=void dev.kske.eventbus.core.DispatchTest.onSimpleEventThird(dev.kske.eventbus.core.SimpleEvent), eventType=class dev.kske.eventbus.core.SimpleEvent, useParameter=true, polymorphic=false, priority=100]\n"
				+ "==========================================================================================",
			executionOrder);
	}

	@Event(SimpleEvent.class)
	@Priority(200)
	void onSimpleEventFirst() {
		++hits;
		assertTrue(hits == 1 || hits == 2);
	}

	@Event(SimpleEvent.class)
	@Polymorphic(false)
	static void onSimpleEventSecond() {
		++hits;
		assertEquals(3, hits);
	}

	@Event
	@Polymorphic(false)
	@Priority(100)
	void onSimpleEventThird(SimpleEvent event) {
		++hits;
		assertEquals(4, hits);
	}
}