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

package org.opensearch.indexmanagement

import org.apache.hc.core5.http.ContentType
import org.apache.hc.core5.http.io.entity.StringEntity
import org.junit.AfterClass
import org.junit.Before
import org.junit.rules.DisableOnDebug
import org.opensearch.action.admin.cluster.node.tasks.list.ListTasksAction
import org.opensearch.client.Request
import org.opensearch.client.Response
import org.opensearch.client.RestClient
import org.opensearch.client.RequestOptions
import org.opensearch.client.WarningsHandler
import org.opensearch.client.ResponseException
import org.opensearch.common.Strings
import org.opensearch.common.io.PathUtils
import org.opensearch.common.settings.Settings
import org.opensearch.core.xcontent.DeprecationHandler
import org.opensearch.core.xcontent.NamedXContentRegistry
import org.opensearch.common.xcontent.XContentType
import org.opensearch.indexmanagement.indexstatemanagement.util.INDEX_HIDDEN
import org.opensearch.core.rest.RestStatus
import org.opensearch.core.xcontent.MediaType
import java.io.IOException
import java.nio.file.Files
import java.util.*
import javax.management.MBeanServerInvocationHandler
import javax.management.ObjectName
import javax.management.remote.JMXConnectorFactory
import javax.management.remote.JMXServiceURL
import kotlin.collections.ArrayList
import kotlin.collections.HashSet

abstract class IndexManagementRestTestCase : ODFERestTestCase() {

    val configSchemaVersion = 18
    val historySchemaVersion = 5

    // Having issues with tests leaking into other tests and mappings being incorrect and they are not caught by any pending task wait check as
    // they do not go through the pending task queue. Ideally this should probably be written in a way to wait for the
    // jobs themselves to finish and gracefully shut them down.. but for now seeing if this works.
    @Before
    fun setAutoCreateIndex() {
        client().makeRequest(
            "PUT", "_cluster/settings",
            StringEntity("""{"persistent":{"action.auto_create_index":"-.opendistro-*,*"}}""", ContentType.APPLICATION_JSON)
        )
    }

    // Tests on lower resource machines are experiencing flaky failures due to attempting to force a job to
    // start before the job scheduler has registered the index operations listener. Initializing the index
    // preemptively seems to give the job scheduler time to listen to operations.
    @Before
    fun initializeManagedIndex() {
        if (!isIndexExists(IndexManagementPlugin.INDEX_MANAGEMENT_INDEX)) {
            val request = Request("PUT", "/${IndexManagementPlugin.INDEX_MANAGEMENT_INDEX}")
            var entity = "{\"settings\": " + Strings.toString(XContentType.JSON, Settings.builder().put(INDEX_HIDDEN, true).build())
            entity += ",\"mappings\" : ${IndexManagementIndices.indexManagementMappings}}"
            request.setJsonEntity(entity)
            client().performRequest(request)
        }
    }

    protected val isDebuggingTest = DisableOnDebug(null).isDebugging
    protected val isDebuggingRemoteCluster = System.getProperty("cluster.debug", "false")!!.toBoolean()

    protected val isLocalTest = clusterName() == "integTest"
    private fun clusterName(): String {
        return System.getProperty("tests.clustername")
    }

    fun Response.asMap(): Map<String, Any> = entityAsMap(this)

    protected fun Response.restStatus(): RestStatus = RestStatus.fromCode(this.statusLine.statusCode)

    protected fun isIndexExists(index: String): Boolean {
        val response = client().makeRequest("HEAD", index)
        return RestStatus.OK == response.restStatus()
    }

    protected fun assertIndexExists(index: String) {
        val response = client().makeRequest("HEAD", index)
        assertEquals("Index $index does not exist.", RestStatus.OK, response.restStatus())
    }

    protected fun assertIndexDoesNotExist(index: String) {
        val response = client().makeRequest("HEAD", index)
        assertEquals("Index $index does exist.", RestStatus.NOT_FOUND, response.restStatus())
    }

    protected fun verifyIndexSchemaVersion(index: String, expectedVersion: Int) {
        val indexMapping = client().getIndexMapping(index)
        val indexName = indexMapping.keys.toList()[0]
        val mappings = indexMapping.stringMap(indexName)?.stringMap("mappings")
        var version = 0
        if (mappings!!.containsKey("_meta")) {
            val meta = mappings.stringMap("_meta")
            if (meta!!.containsKey("schema_version")) version = meta.get("schema_version") as Int
        }
        assertEquals(expectedVersion, version)
    }

    @Suppress("UNCHECKED_CAST")
    fun Map<String, Any>.stringMap(key: String): Map<String, Any>? {
        val map = this as Map<String, Map<String, Any>>
        return map[key]
    }

    fun RestClient.getIndexMapping(index: String): Map<String, Any> {
        val response = this.makeRequest("GET", "$index/_mapping")
        assertEquals(RestStatus.OK, response.restStatus())
        return response.asMap()
    }

    /**
     * Inserts [docCount] sample documents into [index], optionally waiting [delay] milliseconds
     * in between each insertion
     */
    protected fun insertSampleData(index: String, docCount: Int, delay: Long = 0, jsonString: String = "{ \"test_field\": \"test_value\" }", routing: String? = null) {
        var endpoint = "/$index/_doc/?refresh=true"
        if (routing != null) endpoint += "&routing=$routing"
        repeat(docCount) {
            val request = Request("POST", endpoint)
            request.setJsonEntity(jsonString)
            client().performRequest(request)

            Thread.sleep(delay)
        }
    }

    protected fun insertSampleBulkData(index: String, bulkJsonString: String) {
        val request = Request("POST", "/$index/_bulk/?refresh=true")
        request.setJsonEntity(bulkJsonString)
        request.options = RequestOptions.DEFAULT.toBuilder().addHeader("content-type", "application/x-ndjson").build()
        val res = client().performRequest(request)
        assertEquals(RestStatus.OK, res.restStatus())
    }

    /**
     * Indexes 5k documents of the open NYC taxi dataset
     *
     * Example headers and document values
     * VendorID,tpep_pickup_datetime,tpep_dropoff_datetime,passenger_count,trip_distance,RatecodeID,store_and_fwd_flag,PULocationID,DOLocationID,payment_type,fare_amount,extra,mta_tax,tip_amount,tolls_amount,improvement_surcharge,total_amount,congestion_surcharge
     * 1,2019-01-01 00:46:40,2019-01-01 00:53:20,1,1.50,1,N,151,239,1,7,0.5,0.5,1.65,0,0.3,9.95,
     */
    protected fun generateNYCTaxiData(index: String = "nyc-taxi-data") {
        createIndex(index, Settings.EMPTY, """"properties":{"DOLocationID":{"type":"integer"},"RatecodeID":{"type":"integer"},"fare_amount":{"type":"float"},"tpep_dropoff_datetime":{"type":"date","format":"yyyy-MM-dd HH:mm:ss"},"congestion_surcharge":{"type":"float"},"VendorID":{"type":"integer"},"passenger_count":{"type":"integer"},"tolls_amount":{"type":"float"},"improvement_surcharge":{"type":"float"},"trip_distance":{"type":"float"},"store_and_fwd_flag":{"type":"keyword"},"payment_type":{"type":"integer"},"total_amount":{"type":"float"},"extra":{"type":"float"},"tip_amount":{"type":"float"},"mta_tax":{"type":"float"},"tpep_pickup_datetime":{"type":"date","format":"yyyy-MM-dd HH:mm:ss"},"PULocationID":{"type":"integer"}}""")
        insertSampleBulkData(index, javaClass.classLoader.getResource("data/nyc_5000.ndjson").readText())
    }

    protected fun generateMessageLogsData(index: String = "message-logs") {
        createIndex(index, Settings.EMPTY, """"properties": {"message":{"properties":{"bytes_in":{"type":"long"},"bytes_out":{"type":"long"},"plugin":{"eager_global_ordinals":true,"ignore_above":10000,"type":"keyword"},"timestamp_received":{"type":"date"}}}}""")
        insertSampleBulkData(index, javaClass.classLoader.getResource("data/message_logs.ndjson").readText())
    }

    @Suppress("UNCHECKED_CAST")
    protected fun extractFailuresFromSearchResponse(searchResponse: Response): List<Map<String, String>?>? {
        val shards = searchResponse.asMap()["_shards"] as Map<String, ArrayList<Map<String, Any>>>
        assertNotNull(shards)
        val failures = shards["failures"]
        assertNotNull(failures)
        return failures?.let {
            val result: ArrayList<Map<String, String>?>? = ArrayList()
            for (failure in it) {
                result?.add((failure as Map<String, Map<String, String>>)["reason"])
            }
            return result
        }
    }

    override fun preserveIndicesUponCompletion(): Boolean = true
    companion object {
        @JvmStatic
        val isMultiNode = System.getProperty("cluster.number_of_nodes", "1").toInt() > 1
        protected val defaultKeepIndexSet = setOf(".opendistro_security")
        /**
         * We override preserveIndicesUponCompletion to true and use this function to clean up indices
         * Meant to be used in @After or @AfterClass of your feature test suite
         */
        fun wipeAllIndices(client: RestClient = adminClient(), keepIndex: kotlin.collections.Set<String> = defaultKeepIndexSet) {
            try {
                client.performRequest(Request("DELETE", "_data_stream/*"))
            } catch (e: ResponseException) {
                // We hit a version of ES that doesn't serialize DeleteDataStreamAction.Request#wildcardExpressionsOriginallySpecified field or
                // that doesn't support data streams so it's safe to ignore
                val statusCode = e.response.statusLine.statusCode
                if (!setOf(404, 405, 500).contains(statusCode)) {
                    throw e
                }
            }

            val response = client.performRequest(Request("GET", "/_cat/indices?format=json&expand_wildcards=all"))
            val xContentType = MediaType.fromMediaType(response.entity.contentType)
            xContentType.xContent().createParser(
                NamedXContentRegistry.EMPTY, DeprecationHandler.THROW_UNSUPPORTED_OPERATION,
                response.entity.content
            ).use { parser ->
                for (index in parser.list()) {
                    val jsonObject: Map<*, *> = index as java.util.HashMap<*, *>
                    val indexName: String = jsonObject["index"] as String
                    // .opendistro_security isn't allowed to delete from cluster
                    if (!keepIndex.contains(indexName)) {
                        val request = Request("DELETE", "/$indexName")
                        // TODO: remove PERMISSIVE option after moving system index access to REST API call
                        val options = RequestOptions.DEFAULT.toBuilder()
                        options.setWarningsHandler(WarningsHandler.PERMISSIVE)
                        request.options = options.build()
                        client.performRequest(request)
                    }
                }
            }

            waitFor {
                if (!isMultiNode) {
                    waitForRunningTasks(client)
                    waitForPendingTasks(client)
                    waitForThreadPools(client)
                } else {
                    // Multi node test is not suitable to waitFor
                    // We have seen long-running write task that fails the waitFor
                    //  probably because of cluster manager - data node task not in sync
                    // So instead we just sleep 1s after wiping indices
                    Thread.sleep(1_000)
                }
            }
        }

        @JvmStatic
        @Throws(IOException::class)
        protected fun waitForRunningTasks(client: RestClient) {
            val runningTasks: MutableSet<String> = runningTasks(client.performRequest(Request("GET", "/_tasks?detailed")))
            if (runningTasks.isEmpty()) {
                return
            }
            val stillRunning = ArrayList<String>(runningTasks)
            fail("${Date()}: There are still tasks running after this test that might break subsequent tests: \n${stillRunning.joinToString("\n")}.")
        }

        @Suppress("UNCHECKED_CAST")
        @Throws(IOException::class)
        private fun runningTasks(response: Response): MutableSet<String> {
            val runningTasks: MutableSet<String> = HashSet()
            val nodes = entityAsMap(response)["nodes"] as Map<String, Any>?
            for ((_, value) in nodes!!) {
                val nodeInfo = value as Map<String, Any>
                val nodeTasks = nodeInfo["tasks"] as Map<String, Any>?
                for ((_, value1) in nodeTasks!!) {
                    val task = value1 as Map<String, Any>
                    // Ignore the task list API - it doesn't count against us
                    if (task["action"] == ListTasksAction.NAME || task["action"] == ListTasksAction.NAME + "[n]") continue
                    // runningTasks.add(task["action"].toString() + " | " + task["description"].toString())
                    runningTasks.add(task.toString())
                }
            }
            return runningTasks
        }

        @JvmStatic
        protected fun waitForThreadPools(client: RestClient) {
            val response = client.performRequest(Request("GET", "/_cat/thread_pool?format=json"))

            val xContentType = MediaType.fromMediaType(response.entity.contentType)
            xContentType.xContent().createParser(
                NamedXContentRegistry.EMPTY, DeprecationHandler.THROW_UNSUPPORTED_OPERATION,
                response.entity.content
            ).use { parser ->
                for (index in parser.list()) {
                    val jsonObject: Map<*, *> = index as java.util.HashMap<*, *>
                    val active = (jsonObject["active"] as String).toInt()
                    val queue = (jsonObject["queue"] as String).toInt()
                    val name = jsonObject["name"]
                    val trueActive = if (name == "management") active - 1 else active
                    if (trueActive > 0 || queue > 0) {
                        fail("Still active threadpools in cluster: $jsonObject")
                    }
                }
            }
        }

        internal interface IProxy {
            val version: String?
            var sessionId: String?

            fun getExecutionData(reset: Boolean): ByteArray?
            fun dump(reset: Boolean)
            fun reset()
        }

        /*
        * We need to be able to dump the jacoco coverage before the cluster shuts down.
        * The new internal testing framework removed some gradle tasks we were listening to,
        * to choose a good time to do it. This will dump the executionData to file after each test.
        * TODO: This is also currently just overwriting integTest.exec with the updated execData without
        *   resetting after writing each time. This can be improved to either write an exec file per test
        *   or by letting jacoco append to the file.
        * */
        @JvmStatic
        @AfterClass
        fun dumpCoverage() {
            // jacoco.dir set in esplugin-coverage.gradle, if it doesn't exist we don't
            // want to collect coverage, so we can return early
            val jacocoBuildPath = System.getProperty("jacoco.dir") ?: return
            val serverUrl = "service:jmx:rmi:///jndi/rmi://127.0.0.1:7777/jmxrmi"
            JMXConnectorFactory.connect(JMXServiceURL(serverUrl)).use { connector ->
                val proxy = MBeanServerInvocationHandler.newProxyInstance(
                    connector.mBeanServerConnection,
                    ObjectName("org.jacoco:type=Runtime"),
                    IProxy::class.java,
                    false
                )
                proxy.getExecutionData(false)?.let {
                    val path = PathUtils.get("$jacocoBuildPath/integTest.exec")
                    Files.write(path, it)
                }
            }
        }
    }
}