package net.corda.coretests.flows

import co.paralleluniverse.fibers.Suspendable
import net.corda.core.flows.FlowLogic
import net.corda.core.flows.HospitalizeFlowException
import net.corda.core.flows.StartableByRPC
import net.corda.core.identity.Party
import net.corda.core.internal.packageName
import net.corda.core.messaging.startFlow
import net.corda.core.node.services.queryBy
import net.corda.core.transactions.TransactionBuilder
import net.corda.core.utilities.getOrThrow
import net.corda.core.utilities.seconds
import net.corda.coretests.flows.AbstractFlowExternalOperationTest.CustomTableEntity
import net.corda.coretests.flows.AbstractFlowExternalOperationTest.DirectlyAccessedServiceHubException
import net.corda.coretests.flows.AbstractFlowExternalOperationTest.ExternalOperation
import net.corda.coretests.flows.AbstractFlowExternalOperationTest.FlowWithExternalProcess
import net.corda.coretests.flows.AbstractFlowExternalOperationTest.FutureService
import net.corda.coretests.flows.AbstractFlowExternalOperationTest.MyCordaException
import net.corda.testing.contracts.DummyContract
import net.corda.testing.contracts.DummyState
import net.corda.testing.core.ALICE_NAME
import net.corda.testing.core.BOB_NAME
import net.corda.testing.core.singleIdentity
import net.corda.testing.driver.DriverParameters
import net.corda.testing.driver.driver
import net.corda.testing.node.internal.cordappsForPackages
import org.junit.Test
import java.lang.IllegalStateException
import java.sql.SQLTransientConnectionException
import java.util.concurrent.TimeoutException
import kotlin.test.assertEquals
import kotlin.test.assertFailsWith
import kotlin.test.assertTrue

class FlowExternalOperationTest : AbstractFlowExternalOperationTest() {

    @Test(timeout=300_000)
	fun `external operation`() {
        driver(DriverParameters(notarySpecs = emptyList(), startNodesInProcess = true)) {
            val alice = startNode(providedName = ALICE_NAME).getOrThrow()
            val bob = startNode(providedName = BOB_NAME).getOrThrow()
            alice.rpc.startFlow(::FlowWithExternalOperation, bob.nodeInfo.singleIdentity())
                .returnValue.getOrThrow(20.seconds)
            val (discharged, observation) = alice.rpc.startFlow(::GetHospitalCountersFlow).returnValue.getOrThrow()
            assertEquals(0, discharged)
            assertEquals(0, observation)
        }
    }

    @Test(timeout=300_000)
	fun `external operation that checks deduplicationId is not rerun when flow is retried`() {
        driver(DriverParameters(notarySpecs = emptyList(), startNodesInProcess = true)) {
            val alice = startNode(providedName = ALICE_NAME).getOrThrow()
            val bob = startNode(providedName = BOB_NAME).getOrThrow()
            assertFailsWith<DuplicatedProcessException> {
                alice.rpc.startFlow(
                    ::FlowWithExternalOperationWithDeduplication,
                    bob.nodeInfo.singleIdentity()
                ).returnValue.getOrThrow(20.seconds)
            }
            val (discharged, observation) = alice.rpc.startFlow(::GetHospitalCountersFlow).returnValue.getOrThrow()
            assertEquals(1, discharged)
            assertEquals(0, observation)
        }
    }

    @Test(timeout=300_000)
	fun `external operation propagates exception to calling flow`() {
        driver(DriverParameters(notarySpecs = emptyList(), startNodesInProcess = true)) {
            val alice = startNode(providedName = ALICE_NAME).getOrThrow()
            val bob = startNode(providedName = BOB_NAME).getOrThrow()
            assertFailsWith<MyCordaException> {
                alice.rpc.startFlow(
                    ::FlowWithExternalOperationPropagatesException,
                    bob.nodeInfo.singleIdentity(),
                    MyCordaException::class.java
                ).returnValue.getOrThrow(20.seconds)
            }
            val (discharged, observation) = alice.rpc.startFlow(::GetHospitalCountersFlow).returnValue.getOrThrow()
            assertEquals(0, discharged)
            assertEquals(0, observation)
        }
    }

    @Test(timeout=300_000)
	fun `external operation exception can be caught in flow`() {
        driver(DriverParameters(notarySpecs = emptyList(), startNodesInProcess = true)) {
            val alice = startNode(providedName = ALICE_NAME).getOrThrow()
            val bob = startNode(providedName = BOB_NAME).getOrThrow()
            alice.rpc.startFlow(::FlowWithExternalOperationThatThrowsExceptionAndCaughtInFlow, bob.nodeInfo.singleIdentity())
                .returnValue.getOrThrow(20.seconds)
            val (discharged, observation) = alice.rpc.startFlow(::GetHospitalCountersFlow).returnValue.getOrThrow()
            assertEquals(0, discharged)
            assertEquals(0, observation)
        }
    }

    @Test(timeout=300_000)
	fun `external operation with exception that hospital keeps for observation does not fail`() {
        driver(DriverParameters(notarySpecs = emptyList(), startNodesInProcess = true)) {
            val alice = startNode(providedName = ALICE_NAME).getOrThrow()
            val bob = startNode(providedName = BOB_NAME).getOrThrow()
            assertFailsWith<TimeoutException> {
                alice.rpc.startFlow(
                    ::FlowWithExternalOperationPropagatesException,
                    bob.nodeInfo.singleIdentity(),
                    HospitalizeFlowException::class.java
                ).returnValue.getOrThrow(20.seconds)
            }
            val (discharged, observation) = alice.rpc.startFlow(::GetHospitalCountersFlow).returnValue.getOrThrow()
            assertEquals(0, discharged)
            assertEquals(1, observation)
        }
    }

    @Test(timeout=300_000)
	fun `external operation with exception that hospital discharges is retried and runs the external operation again`() {
        driver(DriverParameters(notarySpecs = emptyList(), startNodesInProcess = true)) {
            val alice = startNode(providedName = ALICE_NAME).getOrThrow()
            val bob = startNode(providedName = BOB_NAME).getOrThrow()
            assertFailsWith<TimeoutException> {
                alice.rpc.startFlow(
                    ::FlowWithExternalOperationPropagatesException,
                    bob.nodeInfo.singleIdentity(),
                    SQLTransientConnectionException::class.java
                ).returnValue.getOrThrow(20.seconds)
            }
            val (discharged, observation) = alice.rpc.startFlow(::GetHospitalCountersFlow).returnValue.getOrThrow()
            assertEquals(3, discharged)
            assertEquals(1, observation)
        }
    }

    @Test(timeout=300_000)
	fun `external async operation that passes serviceHub into process can be retried`() {
        driver(DriverParameters(notarySpecs = emptyList(), startNodesInProcess = true)) {
            val alice = startNode(providedName = ALICE_NAME).getOrThrow()
            val bob = startNode(providedName = BOB_NAME).getOrThrow()
            assertFailsWith<TimeoutException> {
                alice.rpc.startFlow(
                    ::FlowWithExternalOperationThatPassesInServiceHubCanRetry,
                    bob.nodeInfo.singleIdentity()
                ).returnValue.getOrThrow(20.seconds)
            }
            val (discharged, observation) = alice.rpc.startFlow(::GetHospitalCountersFlow).returnValue.getOrThrow()
            assertEquals(3, discharged)
            assertEquals(1, observation)
        }
    }

    @Test(timeout=300_000)
	fun `external async operation that accesses serviceHub from flow directly will fail when retried`() {
        driver(DriverParameters(notarySpecs = emptyList(), startNodesInProcess = true)) {
            val alice = startNode(providedName = ALICE_NAME).getOrThrow()
            val bob = startNode(providedName = BOB_NAME).getOrThrow()
            assertFailsWith<DirectlyAccessedServiceHubException> {
                alice.rpc.startFlow(
                    ::FlowWithExternalOperationThatDirectlyAccessesServiceHubFailsRetry,
                    bob.nodeInfo.singleIdentity()
                ).returnValue.getOrThrow(20.seconds)
            }
            val (discharged, observation) = alice.rpc.startFlow(::GetHospitalCountersFlow).returnValue.getOrThrow()
            assertEquals(1, discharged)
            assertEquals(0, observation)
        }
    }

    @Test(timeout=300_000)
	fun `vault can be queried`() {
        driver(
            DriverParameters(
                cordappsForAllNodes = cordappsForPackages(DummyState::class.packageName),
                startNodesInProcess = true
            )
        ) {
            val alice = startNode(providedName = ALICE_NAME).getOrThrow()
            val success = alice.rpc.startFlow(::FlowWithWithExternalOperationThatQueriesVault)
                .returnValue.getOrThrow(20.seconds)
            assertTrue(success)
        }
    }

    @Test(timeout=300_000)
	fun `data can be persisted to node database via entity manager`() {
        driver(DriverParameters(notarySpecs = emptyList(), startNodesInProcess = true)) {
            val alice = startNode(providedName = ALICE_NAME).getOrThrow()
            val success = alice.rpc.startFlow(::FlowWithExternalOperationThatPersistsViaEntityManager)
                .returnValue.getOrThrow(20.seconds)
            assertTrue(success)
        }
    }

    @Test(timeout=300_000)
	fun `data can be persisted to node database via jdbc session`() {
        driver(DriverParameters(notarySpecs = emptyList(), startNodesInProcess = true)) {
            val alice = startNode(providedName = ALICE_NAME).getOrThrow()
            val success = alice.rpc.startFlow(::FlowWithExternalOperationThatPersistsViaJdbcSession)
                .returnValue.getOrThrow(20.seconds)
            assertTrue(success)
        }
    }

    @Test(timeout=300_000)
	fun `data can be persisted to node database via servicehub database transaction`() {
        driver(DriverParameters(notarySpecs = emptyList(), startNodesInProcess = true)) {
            val alice = startNode(providedName = ALICE_NAME).getOrThrow()
            val success = alice.rpc.startFlow(::FlowWithExternalOperationThatPersistsViaDatabaseTransaction)
                .returnValue.getOrThrow(20.seconds)
            assertTrue(success)
        }
    }

    @Test(timeout=300_000)
	fun `data can be persisted to node database in external operation and read from another process once finished`() {
        driver(DriverParameters(notarySpecs = emptyList(), startNodesInProcess = true)) {
            val alice = startNode(providedName = ALICE_NAME).getOrThrow()
            val success = alice.rpc.startFlow(::FlowWithExternalOperationThatPersistsToDatabaseAndReadsFromExternalOperation)
                .returnValue.getOrThrow(20.seconds)
            assertTrue(success)
        }
    }

    @Test(timeout=300_000)
	fun `external operation can be retried when an error occurs inside of database transaction`() {
        driver(DriverParameters(notarySpecs = emptyList(), startNodesInProcess = true)) {
            val alice = startNode(providedName = ALICE_NAME).getOrThrow()
            val bob = startNode(providedName = BOB_NAME).getOrThrow()
            val success = alice.rpc.startFlow(
                ::FlowWithExternalOperationThatErrorsInsideOfDatabaseTransaction,
                bob.nodeInfo.singleIdentity()
            ).returnValue.getOrThrow(20.seconds)
            assertTrue(success as Boolean)
            val (discharged, observation) = alice.rpc.startFlow(::GetHospitalCountersFlow).returnValue.getOrThrow()
            assertEquals(1, discharged)
            assertEquals(0, observation)
        }
    }

    @StartableByRPC
    class FlowWithExternalOperation(party: Party) : FlowWithExternalProcess(party) {

        @Suspendable
        override fun testCode(): Any = await(ExternalOperation(serviceHub) { _, _ -> "please return my message" })
    }

    @StartableByRPC
    class FlowWithExternalOperationWithDeduplication(party: Party) : FlowWithExternalProcess(party) {

        @Suspendable
        override fun testCode(): Any {
            return await(ExternalOperation(serviceHub) { serviceHub, deduplicationId ->
                serviceHub.cordaService(FutureService::class.java).createExceptionWithDeduplication(deduplicationId)
            })
        }
    }

    @StartableByRPC
    class FlowWithExternalOperationPropagatesException<T>(party: Party, private val exceptionType: Class<T>) :
        FlowWithExternalProcess(party) {

        @Suspendable
        override fun testCode() {
            val e = createException()
            await(ExternalOperation(serviceHub) { _, _ -> throw e })
        }

        private fun createException() = when (exceptionType) {
            HospitalizeFlowException::class.java -> HospitalizeFlowException("keep it around")
            SQLTransientConnectionException::class.java -> SQLTransientConnectionException("fake exception - connection is not available")
            else -> MyCordaException("boom")
        }
    }

    @StartableByRPC
    class FlowWithExternalOperationThatThrowsExceptionAndCaughtInFlow(party: Party) :
        FlowWithExternalProcess(party) {

        @Suspendable
        override fun testCode(): Any = try {
            await(ExternalOperation(serviceHub) { _, _ ->
                throw IllegalStateException("threw exception in background process")
            })
        } catch (e: IllegalStateException) {
            log.info("Exception was caught")
            "Exception was caught"
        }
    }

    @StartableByRPC
    class FlowWithExternalOperationThatPassesInServiceHubCanRetry(party: Party) : FlowWithExternalProcess(party) {

        @Suspendable
        override fun testCode(): Any =
            await(ExternalOperation(serviceHub) { serviceHub, _ ->
                serviceHub.cordaService(FutureService::class.java).throwHospitalHandledException()
            })
    }

    @StartableByRPC
    class FlowWithExternalOperationThatDirectlyAccessesServiceHubFailsRetry(party: Party) : FlowWithExternalProcess(party) {

        @Suppress("TooGenericExceptionCaught")
        @Suspendable
        override fun testCode(): Any {
            try {
                await(ExternalOperation(serviceHub) { _, _ ->
                    serviceHub.cordaService(FutureService::class.java).throwHospitalHandledException()
                })
            } catch (e: NullPointerException) {
                throw DirectlyAccessedServiceHubException()
            }
        }
    }

    @StartableByRPC
    class FlowWithWithExternalOperationThatQueriesVault : FlowLogic<Boolean>() {

        @Suspendable
        override fun call(): Boolean {
            val state = DummyState(1, listOf(ourIdentity))
            val tx = TransactionBuilder(serviceHub.networkMapCache.notaryIdentities.first()).apply {
                addOutputState(state)
                addCommand(DummyContract.Commands.Create(), listOf(ourIdentity.owningKey))
            }
            val stx = serviceHub.signInitialTransaction(tx)
            serviceHub.recordTransactions(stx)
            return await(ExternalOperation(serviceHub) { serviceHub, _ ->
                serviceHub.vaultService.queryBy<DummyState>().states.single().state.data == state
            })
        }
    }

    abstract class FlowWithExternalOperationThatPersistsToDatabase : FlowLogic<Boolean>() {

        @Suspendable
        override fun call(): Boolean {
            val (entityOne, entityTwo, entityThree) = saveToDatabase()
            return serviceHub.cordaService(FutureService::class.java).readFromDatabase(entityOne.name) == entityOne &&
                    serviceHub.cordaService(FutureService::class.java).readFromDatabase(entityTwo.name) == entityTwo &&
                    serviceHub.cordaService(FutureService::class.java).readFromDatabase(entityThree.name) == entityThree
        }

        @Suspendable
        abstract fun saveToDatabase(): Triple<CustomTableEntity, CustomTableEntity, CustomTableEntity>
    }

    @StartableByRPC
    class FlowWithExternalOperationThatPersistsViaEntityManager : FlowWithExternalOperationThatPersistsToDatabase() {

        @Suspendable
        override fun saveToDatabase(): Triple<CustomTableEntity, CustomTableEntity, CustomTableEntity> {
            val entityOne = CustomTableEntity("Darth Vader", "I find your lack of faith disturbing.")
            val entityTwo = CustomTableEntity("Obi-Wan Kenobi", "The Force will be with you. Always.")
            val entityThree = CustomTableEntity("Admiral Ackbar", "It’s a trap!")
            await(ExternalOperation(serviceHub) { serviceHub, _ ->
                serviceHub.cordaService(FutureService::class.java).saveToDatabaseWithEntityManager(entityOne)
                serviceHub.cordaService(FutureService::class.java).saveToDatabaseWithEntityManager(entityTwo)
                serviceHub.cordaService(FutureService::class.java).saveToDatabaseWithEntityManager(entityThree)
            })
            return Triple(entityOne, entityTwo, entityThree)
        }
    }

    @StartableByRPC
    class FlowWithExternalOperationThatPersistsViaJdbcSession : FlowWithExternalOperationThatPersistsToDatabase() {

        @Suspendable
        override fun saveToDatabase(): Triple<CustomTableEntity, CustomTableEntity, CustomTableEntity> {
            val entityOne = CustomTableEntity("Tony Stark", "I am Iron Man.")
            val entityTwo = CustomTableEntity("Captain America", "I can do this all day.")
            val entityThree = CustomTableEntity("Hulk", "Puny god.")
            await(ExternalOperation(serviceHub) { serviceHub, _ ->
                serviceHub.cordaService(FutureService::class.java).saveToDatabaseWithJdbcSession(entityOne)
                serviceHub.cordaService(FutureService::class.java).saveToDatabaseWithJdbcSession(entityTwo)
                serviceHub.cordaService(FutureService::class.java).saveToDatabaseWithJdbcSession(entityThree)
            })
            return Triple(entityOne, entityTwo, entityThree)
        }
    }

    @StartableByRPC
    class FlowWithExternalOperationThatPersistsViaDatabaseTransaction : FlowWithExternalOperationThatPersistsToDatabase() {

        @Suspendable
        override fun saveToDatabase(): Triple<CustomTableEntity, CustomTableEntity, CustomTableEntity> {
            val entityOne = CustomTableEntity("Groot", "We are Groot.")
            val entityTwo = CustomTableEntity("Drax", "Nothing goes over my head. My reflexes are too fast. I would catch it.")
            val entityThree = CustomTableEntity("Doctor Strange", "Dormammu, I’ve come to bargain.")
            await(ExternalOperation(serviceHub) { serviceHub, _ ->
                serviceHub.cordaService(FutureService::class.java).saveToDatabaseWithDatabaseTransaction(entityOne)
                serviceHub.cordaService(FutureService::class.java).saveToDatabaseWithDatabaseTransaction(entityTwo)
                serviceHub.cordaService(FutureService::class.java).saveToDatabaseWithDatabaseTransaction(entityThree)
            })
            return Triple(entityOne, entityTwo, entityThree)
        }
    }

    @StartableByRPC
    class FlowWithExternalOperationThatPersistsToDatabaseAndReadsFromExternalOperation : FlowLogic<Boolean>() {

        @Suspendable
        override fun call(): Boolean {
            val entityOne = CustomTableEntity("Emperor Palpatine", "Now, young Skywalker, you will die.")
            val entityTwo = CustomTableEntity("Yoda", "My ally is the Force, and a powerful ally it is.")
            val entityThree = CustomTableEntity("Han Solo", "Never tell me the odds!")
            await(ExternalOperation(serviceHub) { serviceHub, _ ->
                serviceHub.cordaService(FutureService::class.java).saveToDatabaseWithEntityManager(entityOne)
                serviceHub.cordaService(FutureService::class.java).saveToDatabaseWithJdbcSession(entityTwo)
                serviceHub.cordaService(FutureService::class.java).saveToDatabaseWithDatabaseTransaction(entityThree)
            })
            return await(ExternalOperation(serviceHub) { serviceHub, _ ->
                return@ExternalOperation serviceHub.cordaService(FutureService::class.java).readFromDatabase(entityOne.name) == entityOne &&
                        serviceHub.cordaService(FutureService::class.java).readFromDatabase(entityTwo.name) == entityTwo &&
                        serviceHub.cordaService(FutureService::class.java).readFromDatabase(entityThree.name) == entityThree
            })
        }
    }

    @StartableByRPC
    class FlowWithExternalOperationThatErrorsInsideOfDatabaseTransaction(party: Party) : FlowWithExternalProcess(party) {

        private companion object {
            var flag = false
        }

        @Suspendable
        override fun testCode(): Boolean {
            return await(ExternalOperation(serviceHub) { serviceHub, _ ->
                if (!flag) {
                    flag = true
                    serviceHub.cordaService(FutureService::class.java).throwExceptionInsideOfDatabaseTransaction()
                } else {
                    val entity = CustomTableEntity("Emperor Palpatine", "Now, young Skywalker, you will die.")
                    serviceHub.cordaService(FutureService::class.java).saveToDatabaseWithDatabaseTransaction(entity)
                    return@ExternalOperation serviceHub.cordaService(FutureService::class.java).readFromDatabase(entity.name) != null
                }
            })
        }
    }
}