package net.pterodactylus.sone.core

import com.google.common.eventbus.*
import net.pterodactylus.sone.core.event.*
import net.pterodactylus.sone.fcp.FcpInterface.*
import net.pterodactylus.sone.fcp.FcpInterface.FullAccessRequired.*
import net.pterodactylus.sone.fcp.event.*
import net.pterodactylus.sone.test.*
import net.pterodactylus.util.config.*
import org.hamcrest.MatcherAssert.*
import org.hamcrest.Matchers.*
import org.junit.*
import org.mockito.ArgumentMatchers.any
import org.mockito.Mockito.atLeastOnce
import org.mockito.Mockito.never
import org.mockito.Mockito.verify

/**
 * Unit test for [Preferences].
 */
class PreferencesTest {

	private val eventBus = mock<EventBus>()
	private val preferences = Preferences(eventBus)
	private val eventsCaptor = capture<Any>()

	@Test
	fun `preferences retain insertion delay`() {
		preferences.newInsertionDelay = 15
		assertThat(preferences.insertionDelay, equalTo(15))
	}

	@Test
	fun `preferences sends event on setting insertion delay`() {
		preferences.newInsertionDelay = 15
		verify(eventBus, atLeastOnce()).post(eventsCaptor.capture())
		assertThat(eventsCaptor.allValues, hasItem(InsertionDelayChangedEvent(15)))
	}

	@Test(expected = IllegalArgumentException::class)
	fun `invalid insertion delay is rejected`() {
		preferences.newInsertionDelay = -15
	}

	@Test
	fun `no event is sent when invalid insertion delay is set`() {
		try {
			preferences.newInsertionDelay = -15
		} catch (iae: IllegalArgumentException) {
			/* ignore. */
		}

		verify(eventBus, never()).post(any())
	}

	@Test
	fun `preferences return default value when insertion delay is set to null`() {
		preferences.newInsertionDelay = null
		assertThat(preferences.insertionDelay, equalTo(60))
	}

	@Test
	fun `preferences start with insertion delay default value`() {
		assertThat(preferences.insertionDelay, equalTo(60))
	}

	@Test
	fun `preferences saves null for default insertion delay setting`() {
		val configuration = Configuration(MapConfigurationBackend())
		preferences.saveTo(configuration)
		assertThat(configuration.getIntValue("Option/InsertionDelay").getValue(null), nullValue())
	}

	@Test
	fun `preferences retain posts per page`() {
		preferences.newPostsPerPage = 15
		assertThat(preferences.postsPerPage, equalTo(15))
	}

	@Test(expected = IllegalArgumentException::class)
	fun `invalid posts per page is rejected`() {
		preferences.newPostsPerPage = -15
	}

	@Test
	fun `preferences return default value when posts per page is set to null`() {
		preferences.newPostsPerPage = null
		assertThat(preferences.postsPerPage, equalTo(10))
	}

	@Test
	fun `preferences start with posts per page default value`() {
		assertThat(preferences.postsPerPage, equalTo(10))
	}

	@Test
	fun `preferences retain images per page`() {
		preferences.newImagesPerPage = 15
		assertThat(preferences.imagesPerPage, equalTo(15))
	}

	@Test(expected = IllegalArgumentException::class)
	fun `invalid images per page is rejected`() {
		preferences.newImagesPerPage = -15
	}

	@Test
	fun `preferences return default value when images per page is set to null`() {
		preferences.newImagesPerPage = null
		assertThat(preferences.imagesPerPage, equalTo(9))
	}

	@Test
	fun `preferences start with images per page default value`() {
		assertThat(preferences.imagesPerPage, equalTo(9))
	}

	@Test
	fun `preferences retain characters per post`() {
		preferences.newCharactersPerPost = 150
		assertThat(preferences.charactersPerPost, equalTo(150))
	}

	@Test(expected = IllegalArgumentException::class)
	fun `invalid characters per post is rejected`() {
		preferences.newCharactersPerPost = -15
	}

	@Test
	fun `preferences return default value when characters per post is set to null`() {
		preferences.newCharactersPerPost = null
		assertThat(preferences.charactersPerPost, equalTo(400))
	}

	@Test
	fun `preferences start with characters per post default value`() {
		assertThat(preferences.charactersPerPost, equalTo(400))
	}

	@Test
	fun `preferences retain post cut off length`() {
		preferences.newPostCutOffLength = 150
		assertThat(preferences.postCutOffLength, equalTo(150))
	}

	@Test(expected = IllegalArgumentException::class)
	fun `invalid post cut off length is rejected`() {
		preferences.newPostCutOffLength = -15
	}

	@Test(expected = IllegalArgumentException::class)
	fun `cut off length of minus one is not allowed`() {
		preferences.newPostCutOffLength = -1
	}

	@Test
	fun `preferences return default value when post cut off length is set to null`() {
		preferences.newPostCutOffLength = null
		assertThat(preferences.postCutOffLength, equalTo(200))
	}

	@Test
	fun `preferences start with post cut off length default value`() {
		assertThat(preferences.postCutOffLength, equalTo(200))
	}

	@Test
	fun `preferences retain require full access of true`() {
		preferences.newRequireFullAccess = true
		assertThat(preferences.requireFullAccess, equalTo(true))
	}

	@Test
	fun `preferences retain require full access of false`() {
		preferences.newRequireFullAccess = false
		assertThat(preferences.requireFullAccess, equalTo(false))
	}

	@Test
	fun `preferences return default value when require full access is set to null`() {
		preferences.newRequireFullAccess = null
		assertThat(preferences.requireFullAccess, equalTo(false))
	}

	@Test
	fun `preferences start with require full access default value`() {
		assertThat(preferences.requireFullAccess, equalTo(false))
	}

	@Test
	fun `preferences retain fcp interface active of true`() {
		preferences.newFcpInterfaceActive = true
		assertThat(preferences.fcpInterfaceActive, equalTo(true))
		verify(eventBus).post(any(FcpInterfaceActivatedEvent::class.java))
	}

	@Test
	fun `preferences retain fcp interface active of false`() {
		preferences.newFcpInterfaceActive = false
		assertThat(preferences.fcpInterfaceActive, equalTo(false))
		verify(eventBus).post(any(FcpInterfaceDeactivatedEvent::class.java))
	}

	@Test
	fun `preferences return default value when fcp interface active is set to null`() {
		preferences.newFcpInterfaceActive = null
		assertThat(preferences.fcpInterfaceActive, equalTo(false))
		verify(eventBus).post(any(FcpInterfaceDeactivatedEvent::class.java))
	}

	@Test
	fun `preferences start with fcp interface active default value`() {
		assertThat(preferences.fcpInterfaceActive, equalTo(false))
	}

	@Test
	fun `preferences retain fcp full access required of no`() {
		preferences.newFcpFullAccessRequired = NO
		assertThat(preferences.fcpFullAccessRequired, equalTo(NO))
		verifyFullAccessRequiredChangedEvent(NO)
	}

	private fun verifyFullAccessRequiredChangedEvent(
			fullAccessRequired: FullAccessRequired) {
		verify(eventBus).post(eventsCaptor.capture())
		assertThat(eventsCaptor.value, instanceOf(FullAccessRequiredChanged::class.java))
		assertThat((eventsCaptor.value as FullAccessRequiredChanged).fullAccessRequired,
				equalTo(fullAccessRequired))
	}

	@Test
	fun `preferences retain fcp full access required of writing`() {
		preferences.newFcpFullAccessRequired = WRITING
		assertThat(preferences.fcpFullAccessRequired, equalTo(WRITING))
		verifyFullAccessRequiredChangedEvent(WRITING)
	}

	@Test
	fun `preferences retain fcp full access required of always`() {
		preferences.newFcpFullAccessRequired = ALWAYS
		assertThat(preferences.fcpFullAccessRequired, equalTo(ALWAYS))
		verifyFullAccessRequiredChangedEvent(ALWAYS)
	}

	@Test
	fun `preferences return default value when fcp full access required is set to null`() {
		preferences.newFcpFullAccessRequired = null
		assertThat(preferences.fcpFullAccessRequired, equalTo(ALWAYS))
		verifyFullAccessRequiredChangedEvent(ALWAYS)
	}

	@Test
	fun `preferences start with fcp full access required default value`() {
		assertThat(preferences.fcpFullAccessRequired, equalTo(ALWAYS))
	}

	@Test
	fun `setting insertion delay to valid value sends change event`() {
		testPreferencesChangedEvent("InsertionDelay", { preferences.newInsertionDelay = it }, 30)
	}

	@Test
	fun `setting posts per page to valid value sends change event`() {
		testPreferencesChangedEvent("PostsPerPage", { preferences.newPostsPerPage = it }, 31)
	}

	private fun <T : Any> testPreferencesChangedEvent(name: String, setter: (T) -> Unit, value: T) {
		setter(value)
		verify(eventBus, atLeastOnce()).post(eventsCaptor.capture())
		assertThat(eventsCaptor.allValues, hasItem(PreferenceChangedEvent(name, value)))
	}

}