/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.hadoop.metadata.query

import java.io.File
import javax.script.{Bindings, ScriptEngine, ScriptEngineManager}

import com.google.common.collect.ImmutableList
import com.thinkaurelius.titan.core.{TitanFactory, TitanGraph}
import com.tinkerpop.blueprints.Vertex
import com.typesafe.config.{Config, ConfigFactory}
import org.apache.commons.configuration.{Configuration, ConfigurationException, MapConfiguration}
import org.apache.commons.io.FileUtils
import org.apache.hadoop.metadata.typesystem.types._
import org.scalatest.{BeforeAndAfterAll, FunSuite, Assertions}

trait GraphUtils {

    import scala.collection.JavaConversions._

    def getConfiguration(config: Config): Configuration = {
        val keys = config.entrySet().map {
            _.getKey
        }
        val gConfig: java.util.Map[String, String] = new java.util.HashMap[String, String]()
        keys.foreach { k =>
            gConfig.put(k, config.getString(k))
        }
        return new MapConfiguration(gConfig)
    }


    def titanGraph(conf: Config) = {
        try {
            val g = TitanFactory.open(getConfiguration(conf))
            val mgmt = g.getManagementSystem
            val typname = mgmt.makePropertyKey("typeName").dataType(classOf[String]).make()
            mgmt.buildIndex("byTypeName", classOf[Vertex]).addKey(typname).buildCompositeIndex()
            mgmt.commit()
            g
        } catch {
            case e: ConfigurationException => throw new RuntimeException(e)
        }
    }
}

object QueryTestsUtils extends GraphUtils {

    def setupTypes: Unit = {
        def attrDef(name: String, dT: IDataType[_],
                    m: Multiplicity = Multiplicity.OPTIONAL,
                    isComposite: Boolean = false,
                    reverseAttributeName: String = null) = {
            require(name != null)
            require(dT != null)
            new AttributeDefinition(name, dT.getName, m, isComposite, reverseAttributeName)
        }

        def dbClsDef = new HierarchicalTypeDefinition[ClassType](classOf[ClassType], "DB", null,
            Array(
                attrDef("name", DataTypes.STRING_TYPE),
                attrDef("owner", DataTypes.STRING_TYPE),
                attrDef("createTime", DataTypes.INT_TYPE)
            ))

        def storageDescClsDef = new HierarchicalTypeDefinition[ClassType](classOf[ClassType], "StorageDesc", null,
            Array(
                attrDef("inputFormat", DataTypes.STRING_TYPE),
                attrDef("outputFormat", DataTypes.STRING_TYPE)
            ))

        def columnClsDef = new HierarchicalTypeDefinition[ClassType](classOf[ClassType], "Column", null,
            Array(
                attrDef("name", DataTypes.STRING_TYPE),
                attrDef("dataType", DataTypes.STRING_TYPE),
                new AttributeDefinition("sd", "StorageDesc", Multiplicity.REQUIRED, false, null)
            ))

        def tblClsDef = new HierarchicalTypeDefinition[ClassType](classOf[ClassType], "Table", null,
            Array(
                attrDef("name", DataTypes.STRING_TYPE),
                new AttributeDefinition("db", "DB", Multiplicity.REQUIRED, false, null),
                new AttributeDefinition("sd", "StorageDesc", Multiplicity.REQUIRED, false, null)
            ))

        def loadProcessClsDef = new HierarchicalTypeDefinition[ClassType](classOf[ClassType], "LoadProcess", null,
            Array(
                attrDef("name", DataTypes.STRING_TYPE),
                new AttributeDefinition("inputTables", DataTypes.arrayTypeName("Table"), Multiplicity.COLLECTION, false, null),
                new AttributeDefinition("outputTable", "Table", Multiplicity.REQUIRED, false, null)
            ))

        def viewClsDef = new HierarchicalTypeDefinition[ClassType](classOf[ClassType], "View", null,
            Array(
                attrDef("name", DataTypes.STRING_TYPE),
                new AttributeDefinition("inputTables", "Table", Multiplicity.COLLECTION, false, null)
            ))

        def dimTraitDef = new HierarchicalTypeDefinition[TraitType](classOf[TraitType], "Dimension", null,
            Array[AttributeDefinition]())
        def piiTraitDef = new HierarchicalTypeDefinition[TraitType](classOf[TraitType], "PII", null,
            Array[AttributeDefinition]())
        def metricTraitDef = new HierarchicalTypeDefinition[TraitType](classOf[TraitType], "Metric", null,
            Array[AttributeDefinition]())
        def etlTraitDef = new HierarchicalTypeDefinition[TraitType](classOf[TraitType], "ETL", null,
            Array[AttributeDefinition]())
        def jdbcTraitDef = new HierarchicalTypeDefinition[TraitType](classOf[TraitType], "JdbcAccess", null,
            Array[AttributeDefinition]())

        TypeSystem.getInstance().defineTypes(ImmutableList.of[StructTypeDefinition],
            ImmutableList.of[HierarchicalTypeDefinition[TraitType]](dimTraitDef, piiTraitDef,
                metricTraitDef, etlTraitDef, jdbcTraitDef),
            ImmutableList.of[HierarchicalTypeDefinition[ClassType]](dbClsDef, storageDescClsDef, columnClsDef, tblClsDef,
                loadProcessClsDef, viewClsDef))

        ()
    }

    def setupTestGraph: TitanGraph = {
        var conf = ConfigFactory.load()
        conf = conf.getConfig("graphRepo")
        val g = titanGraph(conf)
        val manager: ScriptEngineManager = new ScriptEngineManager
        val engine: ScriptEngine = manager.getEngineByName("gremlin-groovy")
        val bindings: Bindings = engine.createBindings
        bindings.put("g", g)

        val hiveGraphFile = FileUtils.getTempDirectory().getPath.toString + File.separator + System.nanoTime() + ".gson"
        HiveTitanSample.writeGson(hiveGraphFile)
        bindings.put("hiveGraphFile", hiveGraphFile)

        engine.eval("g.loadGraphSON(hiveGraphFile)", bindings)
        g
    }

}

trait BaseGremlinTest {
  self : FunSuite with BeforeAndAfterAll =>

  val STRUCT_NAME_REGEX = (TypeUtils.TEMP_STRUCT_NAME_PREFIX + "\\d+").r
  def validateJson(r: GremlinQueryResult, expected: String = null): Unit = {
    val rJ = r.toJson
    if (expected != null) {
      val a = STRUCT_NAME_REGEX.replaceAllIn(rJ, "")
      val b = STRUCT_NAME_REGEX.replaceAllIn(expected, "")
      Assertions.assert(a == b)
    } else {
      println(rJ)
    }
  }

}
