/*
 * Copyright © 2017-2018 AT&T Intellectual Property.
 *
 * Licensed 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.onap.ccsdk.apps.blueprintsprocessor.functions.python.executor

import com.fasterxml.jackson.databind.node.ArrayNode
import org.apache.commons.io.FilenameUtils
import org.onap.ccsdk.apps.blueprintsprocessor.core.api.data.ExecutionServiceInput
import org.onap.ccsdk.apps.blueprintsprocessor.functions.python.executor.utils.PythonExecutorUtils
import org.onap.ccsdk.apps.blueprintsprocessor.services.execution.AbstractComponentFunction
import org.onap.ccsdk.apps.controllerblueprints.core.BluePrintProcessorException
import org.onap.ccsdk.apps.controllerblueprints.core.checkNotEmptyNThrow
import org.onap.ccsdk.apps.controllerblueprints.core.data.OperationAssignment
import org.slf4j.LoggerFactory
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.beans.factory.config.ConfigurableBeanFactory
import org.springframework.context.ApplicationContext
import org.springframework.context.annotation.Scope
import org.springframework.stereotype.Component

@Component("component-jython-executor")
@Scope(value = ConfigurableBeanFactory.SCOPE_PROTOTYPE)
open class ComponentJythonExecutor(private val pythonExecutorProperty: PythonExecutorProperty) : AbstractComponentFunction() {

    private val log = LoggerFactory.getLogger(ComponentJythonExecutor::class.java)

    private var componentFunction: AbstractComponentFunction? = null

    @Autowired
    lateinit var applicationContext: ApplicationContext

    fun populateJythonComponentInstance(executionServiceInput: ExecutionServiceInput) {
        val bluePrintContext = bluePrintRuntimeService!!.bluePrintContext()

        val operationAssignment: OperationAssignment = bluePrintContext
                .nodeTemplateInterfaceOperation(nodeTemplateName, interfaceName, operationName)

        val blueprintBasePath: String = bluePrintContext.rootPath

        val artifactName: String = operationAssignment.implementation?.primary
                ?: throw BluePrintProcessorException("missing primary field to get artifact name for node template ($nodeTemplateName)")

        val artifactDefinition = bluePrintRuntimeService!!.resolveNodeTemplateArtifactDefinition(nodeTemplateName, artifactName)

        val pythonFileName = artifactDefinition.file
                ?: throw BluePrintProcessorException("missing file name for node template ($nodeTemplateName)'s artifactName($artifactName)")

        val pythonClassName = FilenameUtils.getBaseName(pythonFileName)

        val content: String? = bluePrintRuntimeService!!.resolveNodeTemplateArtifact(nodeTemplateName, artifactName)

        checkNotEmptyNThrow(content, "artifact ($artifactName) content is empty")

        val pythonPath: MutableList<String> = operationAssignment.implementation?.dependencies ?: arrayListOf()
        pythonPath.add(blueprintBasePath)
        pythonPath.addAll(pythonExecutorProperty.modulePaths)

        val jythonInstances: MutableMap<String, Any> = hashMapOf()
        jythonInstances["log"] = LoggerFactory.getLogger(nodeTemplateName)

        val instanceDependenciesNode: ArrayNode = operationInputs[PythonExecutorConstants.INPUT_INSTANCE_DEPENDENCIES] as? ArrayNode
                ?: throw BluePrintProcessorException("Failed to get property(${PythonExecutorConstants.INPUT_INSTANCE_DEPENDENCIES})")

        instanceDependenciesNode.forEach { instanceName ->
            jythonInstances[instanceName.textValue()] = applicationContext.getBean(instanceName.textValue())
        }

        componentFunction = PythonExecutorUtils.getPythonComponent(pythonExecutorProperty.executionPath,
                pythonPath, content, pythonClassName, jythonInstances)
    }


    override fun process(executionServiceInput: ExecutionServiceInput) {

        log.info("Processing : ${operationInputs}")
        checkNotNull(bluePrintRuntimeService) { "failed to get bluePrintRuntimeService" }

        // Populate Component Instance
        populateJythonComponentInstance(executionServiceInput)

        // Invoke Jython Component Script
        componentFunction!!.process(executionServiceInput)

    }

    override fun recover(runtimeException: RuntimeException, executionRequest: ExecutionServiceInput) {
        componentFunction!!.recover(runtimeException, executionRequest)
    }

}