/*
 * Copyright © 2017-2018 AT&T Intellectual Property.
 * Modifications Copyright © 2018 - 2019 IBM, Bell Canada.
 *
 * 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.controllerblueprints.core.service

import com.fasterxml.jackson.databind.JsonNode
import com.fasterxml.jackson.databind.node.NullNode
import org.onap.ccsdk.cds.controllerblueprints.core.BluePrintConstants
import org.onap.ccsdk.cds.controllerblueprints.core.BluePrintException
import org.onap.ccsdk.cds.controllerblueprints.core.asJsonPrimitive
import org.onap.ccsdk.cds.controllerblueprints.core.data.ArtifactDefinition
import org.onap.ccsdk.cds.controllerblueprints.core.data.ArtifactExpression
import org.onap.ccsdk.cds.controllerblueprints.core.data.AttributeDefinition
import org.onap.ccsdk.cds.controllerblueprints.core.data.AttributeExpression
import org.onap.ccsdk.cds.controllerblueprints.core.data.ExpressionData
import org.onap.ccsdk.cds.controllerblueprints.core.data.OperationOutputExpression
import org.onap.ccsdk.cds.controllerblueprints.core.data.PropertyDefinition
import org.onap.ccsdk.cds.controllerblueprints.core.data.PropertyExpression
import org.onap.ccsdk.cds.controllerblueprints.core.format
import org.onap.ccsdk.cds.controllerblueprints.core.isComplexType
import org.onap.ccsdk.cds.controllerblueprints.core.jsonPathParse
import org.onap.ccsdk.cds.controllerblueprints.core.utils.JacksonUtils
import org.onap.ccsdk.cds.controllerblueprints.core.utils.ResourceResolverUtils
import org.slf4j.LoggerFactory

/**
 *
 *
 * @author Brinda Santh
 */
class PropertyAssignmentService(var bluePrintRuntimeService: BluePrintRuntimeService<MutableMap<String, JsonNode>>) {

    private val log = LoggerFactory.getLogger(this::class.toString())

    private var bluePrintContext: BluePrintContext = bluePrintRuntimeService.bluePrintContext()

    /*

    If Property Assignment is Expression.
        Get the Expression
        Recursively resolve the expression
     */

    fun resolveAssignmentExpression(
        nodeTemplateName: String,
        assignmentName: String,
        assignment: JsonNode
    ): JsonNode {
        val valueNode: JsonNode
        log.trace("Assignment ({})", assignment)
        val expressionData = BluePrintExpressionService.getExpressionData(assignment)

        if (expressionData.isExpression) {
            valueNode = resolveExpression(nodeTemplateName, assignmentName, expressionData)
        } else {
            valueNode = expressionData.valueNode
        }
        return valueNode
    }

    fun resolveExpression(nodeTemplateName: String, propName: String, expressionData: ExpressionData): JsonNode {

        var valueNode: JsonNode = NullNode.getInstance()

        if (expressionData.isExpression) {
            val command = expressionData.command!!

            when (command) {
                BluePrintConstants.EXPRESSION_GET_INPUT -> {
                    valueNode = bluePrintRuntimeService.getInputValue(expressionData.inputExpression?.propertyName!!)
                }
                BluePrintConstants.EXPRESSION_GET_ATTRIBUTE -> {
                    valueNode = resolveAttributeExpression(nodeTemplateName, expressionData.attributeExpression!!)
                }
                BluePrintConstants.EXPRESSION_GET_PROPERTY -> {
                    valueNode = resolvePropertyExpression(nodeTemplateName, expressionData.propertyExpression!!)
                }
                BluePrintConstants.EXPRESSION_GET_OPERATION_OUTPUT -> {
                    valueNode = resolveOperationOutputExpression(nodeTemplateName, expressionData.operationOutputExpression!!)
                }
                BluePrintConstants.EXPRESSION_GET_ARTIFACT -> {
                    valueNode = resolveArtifactExpression(nodeTemplateName, expressionData.artifactExpression!!)
                }
                BluePrintConstants.EXPRESSION_DSL_REFERENCE -> {
                    valueNode = bluePrintRuntimeService.resolveDSLExpression(expressionData.dslExpression!!.propertyName)
                }
                BluePrintConstants.EXPRESSION_GET_NODE_OF_TYPE -> {
                }
                else -> {
                    throw BluePrintException(format("for property ({}), command ({}) is not supported ", propName, command))
                }
            }
        }
        return valueNode
    }

    /*
    get_attribute: [ <modelable_entity_name>, <optional_req_or_cap_name>, <property_name>,
    <nested_property_name_or_index_1>, ..., <nested_property_name_or_index_n> ]
 */
    fun resolveAttributeExpression(nodeTemplateName: String, attributeExpression: AttributeExpression): JsonNode {
        var valueNode: JsonNode

        val attributeName = attributeExpression.attributeName
        val subAttributeName: String? = attributeExpression.subAttributeName

        var attributeNodeTemplateName = nodeTemplateName
        /**
         * Attributes are dynamic runtime properties information. There are multiple types of Attributes,
         * ENV : Environment Variables
         * APP : Application properties ( ie Spring resolved properties )
         * BPP : Blueprint Properties, Specific to Blue Print execution.
         * SELF : Current Node Template properties.
         */
        when (attributeExpression.modelableEntityName) {
            BluePrintConstants.PROPERTY_ENV -> {
                val environmentValue = System.getProperty(attributeName)
                valueNode = environmentValue.asJsonPrimitive()
            }
            BluePrintConstants.PROPERTY_APP -> {
                TODO("Get property from application properties")
            }
            BluePrintConstants.PROPERTY_BPP -> {
                valueNode = bluePrintRuntimeService.getNodeTemplateAttributeValue(BluePrintConstants.PROPERTY_BPP, attributeName)
                    ?: throw BluePrintException("failed to get env attribute name ($attributeName) ")
            }
            else -> {
                if (!attributeExpression.modelableEntityName.equals(BluePrintConstants.PROPERTY_SELF, true)) {
                    attributeNodeTemplateName = attributeExpression.modelableEntityName
                }

                var attributeDefinition: AttributeDefinition = bluePrintContext
                    .nodeTemplateNodeType(attributeNodeTemplateName).attributes?.get(attributeName)
                    ?: throw BluePrintException("failed to get attribute definitions for node template ($attributeNodeTemplateName)'s attribute name ($attributeName) ")

                valueNode = bluePrintRuntimeService.getNodeTemplateAttributeValue(attributeNodeTemplateName, attributeName)
                    ?: throw BluePrintException("failed to get node template ($attributeNodeTemplateName)'s attribute name ($attributeName) ")
            }
        }
        if (subAttributeName != null) {
            if (valueNode.isComplexType())
                valueNode = valueNode.jsonPathParse(subAttributeName)
        }
        return valueNode
    }

    /*
        get_property: [ <modelable_entity_name>, <optional_req_or_cap_name>, <property_name>,
        <nested_property_name_or_index_1>, ..., <nested_property_name_or_index_n> ]
     */
    fun resolvePropertyExpression(nodeTemplateName: String, propertyExpression: PropertyExpression): JsonNode {
        var valueNode: JsonNode

        val propertyName = propertyExpression.propertyName
        val subPropertyName: String? = propertyExpression.subPropertyName

        var propertyNodeTemplateName = nodeTemplateName

        if (!propertyExpression.modelableEntityName.equals(BluePrintConstants.PROPERTY_SELF, true)) {
            propertyNodeTemplateName = propertyExpression.modelableEntityName
        }

        val nodeTemplatePropertyExpression = bluePrintContext.nodeTemplateByName(propertyNodeTemplateName).properties?.get(propertyName)
            ?: throw BluePrintException(
                format(
                    "failed to get property definitions for node template ({})'s property name ({}) ",
                    nodeTemplateName,
                    propertyName
                )
            )

        var propertyDefinition: PropertyDefinition = bluePrintContext.nodeTemplateNodeType(propertyNodeTemplateName).properties?.get(propertyName)!!

        log.info(
            "node template name ({}), property Name ({}) resolved value ({})",
            propertyNodeTemplateName,
            propertyName,
            nodeTemplatePropertyExpression
        )

        // Check it it is a nested expression
        valueNode = resolveAssignmentExpression(propertyNodeTemplateName, propertyName, nodeTemplatePropertyExpression)

        if (subPropertyName != null) {
            if (valueNode.isComplexType())
                valueNode = valueNode.jsonPathParse(subPropertyName)
        }
        return valueNode
    }

    /*
    get_operation_output: <modelable_entity_name>, <interface_name>, <operation_name>, <output_variable_name>
     */
    fun resolveOperationOutputExpression(nodeTemplateName: String, operationOutputExpression: OperationOutputExpression): JsonNode {
        var outputNodeTemplateName = nodeTemplateName
        if (!operationOutputExpression.modelableEntityName.equals("SELF", true)) {
            outputNodeTemplateName = operationOutputExpression.modelableEntityName
        }

        var valueNode = bluePrintRuntimeService.getNodeTemplateOperationOutputValue(
            outputNodeTemplateName,
            operationOutputExpression.interfaceName, operationOutputExpression.operationName,
            operationOutputExpression.propertyName
        )

        val subPropertyName: String? = operationOutputExpression.subPropertyName
        if (subPropertyName != null) {
            if (valueNode.isComplexType())
                valueNode = valueNode.jsonPathParse(subPropertyName)
        }
        return valueNode
    }

    /*
    get_artifact: [ <modelable_entity_name>, <artifact_name>, <location>, <remove> ]
     */
    fun resolveArtifactExpression(nodeTemplateName: String, artifactExpression: ArtifactExpression): JsonNode {

        var artifactNodeTemplateName = nodeTemplateName
        if (!artifactExpression.modelableEntityName.equals("SELF", true)) {
            artifactNodeTemplateName = artifactExpression.modelableEntityName
        }
        val artifactDefinition: ArtifactDefinition = bluePrintContext.nodeTemplateByName(artifactNodeTemplateName)
            .artifacts?.get(artifactExpression.artifactName)
            ?: throw BluePrintException(
                format(
                    "failed to get artifact definitions for node template ({})'s " +
                            "artifact name ({}) ", nodeTemplateName, artifactExpression.artifactName
                )
            )

        return JacksonUtils.jsonNodeFromObject(artifactContent(artifactDefinition))
    }

    fun artifactContent(artifactDefinition: ArtifactDefinition): String {
        val bluePrintBasePath: String = bluePrintContext.rootPath

        if (artifactDefinition.repository != null) {
            TODO()
        } else if (artifactDefinition.file != null) {
            return ResourceResolverUtils.getFileContent(artifactDefinition.file, bluePrintBasePath)
        }
        return ""
    }
}