/*
 * Copyright OpenSearch Contributors
 * SPDX-License-Identifier: Apache-2.0
 */

package org.opensearch.indexmanagement.indexstatemanagement.action

import org.opensearch.indexmanagement.indexstatemanagement.IndexStateManagementRestTestCase
import org.opensearch.indexmanagement.indexstatemanagement.model.Policy
import org.opensearch.indexmanagement.indexstatemanagement.model.State
import org.opensearch.indexmanagement.indexstatemanagement.model.Transition
import org.opensearch.indexmanagement.indexstatemanagement.randomErrorNotification
import org.opensearch.indexmanagement.waitFor
import java.time.Instant
import java.time.temporal.ChronoUnit
import java.util.Locale

class CloseActionIT : IndexStateManagementRestTestCase() {
    private val testIndexName = javaClass.simpleName.lowercase(Locale.ROOT)

    fun `test basic`() {
        val indexName = "${testIndexName}_index_1"
        val policyID = "${testIndexName}_testPolicyName_1"
        val actionConfig = CloseAction(0)
        val states = listOf(
            State("CloseState", listOf(actionConfig), listOf())
        )

        val policy = Policy(
            id = policyID,
            description = "$testIndexName description",
            schemaVersion = 1L,
            lastUpdatedTime = Instant.now().truncatedTo(ChronoUnit.MILLIS),
            errorNotification = randomErrorNotification(),
            defaultState = states[0].name,
            states = states
        )
        createPolicy(policy, policyID)
        createIndex(indexName, policyID)

        assertEquals("open", getIndexState(indexName))

        val managedIndexConfig = getExistingManagedIndexConfig(indexName)
        // Change the start time so the job will trigger in 2 seconds.
        updateManagedIndexConfigStartTime(managedIndexConfig)

        waitFor { assertEquals(policyID, getExplainManagedIndexMetaData(indexName).policyID) }

        // Need to wait two cycles.
        // Change the start time so the job will trigger in 2 seconds.
        updateManagedIndexConfigStartTime(managedIndexConfig)

        waitFor { assertEquals("close", getIndexState(indexName)) }
    }

    fun `test already closed index`() {
        val indexName = "${testIndexName}_index_2"
        val policyID = "${testIndexName}_testPolicyName_2"
        val actionConfig = CloseAction(0)
        val states = listOf(
            State("CloseState", listOf(actionConfig), listOf())
        )

        val policy = Policy(
            id = policyID,
            description = "$testIndexName description",
            schemaVersion = 1L,
            lastUpdatedTime = Instant.now().truncatedTo(ChronoUnit.MILLIS),
            errorNotification = randomErrorNotification(),
            defaultState = states[0].name,
            states = states
        )
        createPolicy(policy, policyID)
        createIndex(indexName, policyID)

        closeIndex(indexName)
        assertEquals("close", getIndexState(indexName))

        val managedIndexConfig = getExistingManagedIndexConfig(indexName)
        // Change the start time so the job will trigger in 2 seconds.
        updateManagedIndexConfigStartTime(managedIndexConfig)

        waitFor { assertEquals(policyID, getExplainManagedIndexMetaData(indexName).policyID) }

        // Need to wait two cycles.
        // Change the start time so the job will trigger in 2 seconds.
        updateManagedIndexConfigStartTime(managedIndexConfig)

        waitFor { assertEquals("close", getIndexState(indexName)) }
    }

    fun `test transitioning a closed index`() {
        val indexName = "${testIndexName}_index_3"
        val policyID = "${testIndexName}_testPolicyName_3"
        val actionConfig = CloseAction(0)
        val secondState = State("LastState", emptyList(), emptyList())
        val firstState = State("CloseState", listOf(actionConfig), listOf(Transition(stateName = secondState.name, conditions = null)))
        val states = listOf(firstState, secondState)

        val policy = Policy(
            id = policyID,
            description = "$testIndexName description",
            schemaVersion = 1L,
            lastUpdatedTime = Instant.now().truncatedTo(ChronoUnit.MILLIS),
            errorNotification = randomErrorNotification(),
            defaultState = states[0].name,
            states = states
        )
        createPolicy(policy, policyID)
        createIndex(indexName, policyID)

        assertEquals("open", getIndexState(indexName))

        val managedIndexConfig = getExistingManagedIndexConfig(indexName)
        // Change the start time so the job will trigger in 2 seconds and init policy
        updateManagedIndexConfigStartTime(managedIndexConfig)

        waitFor { assertEquals(policyID, getExplainManagedIndexMetaData(indexName).policyID) }

        // Change the start time so the job will trigger in 2 seconds and close the index
        updateManagedIndexConfigStartTime(managedIndexConfig)

        waitFor { assertEquals("close", getIndexState(indexName)) }

        // Change the start time so the job will trigger in 2 seconds and attempt transitions
        updateManagedIndexConfigStartTime(managedIndexConfig)

        waitFor { assertEquals(secondState.name, getExplainManagedIndexMetaData(indexName).transitionTo) }

        // Change the start time so the job will trigger in 2 seconds and transition to next state (which should complete policy)
        updateManagedIndexConfigStartTime(managedIndexConfig)

        waitFor { assertEquals(true, getExplainManagedIndexMetaData(indexName).policyCompleted) }
    }
}