/*
 *  Copyright © 2019 IBM.
 *
 *  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.cds.blueprintsprocessor.services.workflow

import com.fasterxml.jackson.databind.JsonNode
import org.onap.ccsdk.cds.blueprintsprocessor.core.api.data.ExecutionServiceInput
import org.onap.ccsdk.cds.blueprintsprocessor.core.api.data.ExecutionServiceOutput
import org.onap.ccsdk.cds.blueprintsprocessor.core.api.data.StepData
import org.onap.ccsdk.cds.blueprintsprocessor.services.execution.AbstractComponentFunction
import org.onap.ccsdk.cds.controllerblueprints.core.BluePrintConstants
import org.onap.ccsdk.cds.controllerblueprints.core.asJsonPrimitive
import org.onap.ccsdk.cds.controllerblueprints.core.data.Implementation
import org.onap.ccsdk.cds.controllerblueprints.core.service.BluePrintDependencyService
import org.onap.ccsdk.cds.controllerblueprints.core.service.BluePrintRuntimeService
import org.slf4j.LoggerFactory
import org.springframework.stereotype.Service

@Service
open class NodeTemplateExecutionService {

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

    suspend fun executeNodeTemplate(
        bluePrintRuntimeService: BluePrintRuntimeService<*>,
        nodeTemplateName: String,
        executionServiceInput: ExecutionServiceInput
    ): ExecutionServiceOutput {
        // Get the Blueprint Context
        val blueprintContext = bluePrintRuntimeService.bluePrintContext()

        val nodeTemplate = blueprintContext.nodeTemplateByName(nodeTemplateName)
        // Get the Component Name, NodeTemplate type is mapped to Component Name
        val componentName = nodeTemplate.type

        val interfaceName = blueprintContext.nodeTemplateFirstInterfaceName(nodeTemplateName)

        val operationName = blueprintContext.nodeTemplateFirstInterfaceFirstOperationName(nodeTemplateName)

        val nodeTemplateImplementation = blueprintContext
            .nodeTemplateOperationImplementation(nodeTemplateName, interfaceName, operationName)
            ?: Implementation()

        log.info(
            "executing node template($nodeTemplateName) component($componentName) " +
                "interface($interfaceName) operation($operationName) on host (${nodeTemplateImplementation.operationHost}) " +
                "with timeout(${nodeTemplateImplementation.timeout}) sec."
        )

        // Get the Component Instance
        val plugin = BluePrintDependencyService.instance<AbstractComponentFunction>(componentName)
        // Set the Blueprint Service
        plugin.bluePrintRuntimeService = bluePrintRuntimeService
        plugin.stepName = nodeTemplateName

        // Parent request shouldn't tamper, so need to clone the request and send to the actual component.
        val clonedExecutionServiceInput = ExecutionServiceInput().apply {
            commonHeader = executionServiceInput.commonHeader
            actionIdentifiers = executionServiceInput.actionIdentifiers
            payload = executionServiceInput.payload
        }

        // Populate Step Meta Data
        val stepInputs: MutableMap<String, JsonNode> = hashMapOf()
        stepInputs[BluePrintConstants.PROPERTY_CURRENT_NODE_TEMPLATE] = nodeTemplateName.asJsonPrimitive()
        stepInputs[BluePrintConstants.PROPERTY_CURRENT_INTERFACE] = interfaceName.asJsonPrimitive()
        stepInputs[BluePrintConstants.PROPERTY_CURRENT_OPERATION] = operationName.asJsonPrimitive()
        val stepInputData = StepData().apply {
            name = nodeTemplateName
            properties = stepInputs
        }
        clonedExecutionServiceInput.stepData = stepInputData

        // Get the Request from the Context and Set to the Function Input and Invoke the function
        return plugin.applyNB(clonedExecutionServiceInput)
    }
}