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 * 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
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package org.jbpm.compiler.canonical;

import java.util.List;
import java.util.Optional;

import org.jbpm.process.core.context.exception.CompensationScope;
import org.jbpm.process.core.context.variable.Variable;
import org.jbpm.process.core.context.variable.VariableScope;
import org.jbpm.process.instance.impl.actions.HandleEscalationAction;
import org.jbpm.process.instance.impl.actions.ProcessInstanceCompensationAction;
import org.jbpm.ruleflow.core.Metadata;
import org.jbpm.ruleflow.core.factory.ActionNodeFactory;
import org.jbpm.workflow.core.DroolsAction;
import org.jbpm.workflow.core.impl.DroolsConsequenceAction;
import org.jbpm.workflow.core.node.ActionNode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.github.javaparser.StaticJavaParser;
import com.github.javaparser.ast.body.Parameter;
import com.github.javaparser.ast.expr.LambdaExpr;
import com.github.javaparser.ast.stmt.BlockStmt;
import com.github.javaparser.ast.type.UnknownType;

import static org.jbpm.ruleflow.core.Metadata.CUSTOM_SCOPE;
import static org.jbpm.ruleflow.core.Metadata.EVENT_TYPE;
import static org.jbpm.ruleflow.core.Metadata.EVENT_TYPE_SIGNAL;
import static org.jbpm.ruleflow.core.Metadata.MAPPING_VARIABLE_INPUT;
import static org.jbpm.ruleflow.core.Metadata.REF;
import static org.jbpm.ruleflow.core.Metadata.TRIGGER_REF;
import static org.jbpm.ruleflow.core.Metadata.VARIABLE;
import static org.jbpm.ruleflow.core.factory.ActionNodeFactory.METHOD_ACTION;

public class ActionNodeVisitor extends AbstractNodeVisitor {

    private static final Logger LOGGER = LoggerFactory.getLogger(ActionNodeVisitor.class);

    private static final String INTERMEDIATE_COMPENSATION_TYPE = "IntermediateThrowEvent-None";

    @Override
    protected String getNodeKey() {
        return "actionNode";
    }

    @Override
    public void visitNode(String factoryField, ActionNode node, BlockStmt body, VariableScope variableScope, ProcessMetaData metadata) {
        body.addStatement(getAssignedFactoryMethod(factoryField, ActionNodeFactory.class, getNodeId(node), getNodeKey(), getWorkflowElementConstructor(node.getId())))
                .addStatement(getNameMethod(node, "Script"));
        visitMetaData(node.getMetaData(), body, getNodeId(node));

        Optional supplierAction = getAction(node, ExpressionSupplier.class);
        if (isIntermediateCompensation(node)) {
            ProcessInstanceCompensationAction action = (ProcessInstanceCompensationAction) node.getAction().getMetaData(Metadata.ACTION);
            String compensateNode = CompensationScope.IMPLICIT_COMPENSATION_PREFIX + metadata.getProcessId();
            if (action != null) {
                compensateNode = action.getActivityRef();
            }
            LambdaExpr lambda = buildCompensationLambdaExpr(compensateNode);
            body.addStatement(getFactoryMethod(getNodeId(node), METHOD_ACTION, lambda));
        } else if (supplierAction.isPresent()) {
            body.addStatement(getFactoryMethod(getNodeId(node), METHOD_ACTION, supplierAction.get().get(node, metadata)));
        } else if (node.getMetaData(TRIGGER_REF) != null) { // if there is trigger defined on end event create TriggerMetaData for it
            body.addStatement(getFactoryMethod(getNodeId(node), METHOD_ACTION, buildProducerAction(node, metadata)));
        } else if (node.getMetaData(REF) != null && EVENT_TYPE_SIGNAL.equals(node.getMetaData(EVENT_TYPE))) {
            body.addStatement(getFactoryMethod(getNodeId(node), METHOD_ACTION, buildSignalAction((String) node.getMetaData(REF),
                    (String) node.getMetaData(VARIABLE), (String) node.getMetaData(MAPPING_VARIABLE_INPUT), (String) node.getMetaData(CUSTOM_SCOPE))));
        } else if (node.getAction() instanceof DroolsConsequenceAction) {
            DroolsConsequenceAction droolsConsequenceAction = (DroolsConsequenceAction) node.getAction();
            if (droolsConsequenceAction.getMetaData("Action") instanceof HandleEscalationAction) {
                HandleEscalationAction action = (HandleEscalationAction) droolsConsequenceAction.getMetaData("Action");
                body.addStatement(getFactoryMethod(getNodeId(node), METHOD_ACTION, buildEscalationAction(action.getFaultName(), action.getVariableName())));
            } else {
                BlockStmt actionBody = new BlockStmt();
                String consequence = getActionConsequence(node.getAction());
                if (consequence == null || consequence.trim().isEmpty()) {
                    LOGGER.warn("Action node {} name {} has no action defined!", node.getId().toExternalFormat(), node.getName());
                } else {
                    List variables = variableScope.getVariables();
                    variables.stream()
                            .filter(v -> consequence.contains(v.getName()))
                            .map(ActionNodeVisitor::makeAssignment)
                            .forEach(actionBody::addStatement);

                    BlockStmt blockStmt = StaticJavaParser.parseBlock("{" + consequence + "}");
                    blockStmt.getStatements().forEach(actionBody::addStatement);
                }
                LambdaExpr lambda = new LambdaExpr(
                        new Parameter(new UnknownType(), KCONTEXT_VAR), // (kcontext) ->
                        actionBody);
                body.addStatement(getFactoryMethod(getNodeId(node), METHOD_ACTION, lambda));
            }

        }
        addNodeMappings(node, body, getNodeId(node));
        body.addStatement(getDoneMethod(getNodeId(node)));
    }

    private boolean isIntermediateCompensation(ActionNode node) {
        return INTERMEDIATE_COMPENSATION_TYPE.equals(node.getMetaData(Metadata.NODE_TYPE));
    }

    private String getActionConsequence(DroolsAction action) {
        return ((DroolsConsequenceAction) action).getConsequence();
    }

    protected  Optional getAction(ActionNode node, Class actionClass) {
        Object action = node.getAction().getMetaData("Action");
        return actionClass.isInstance(action) ? Optional.of(actionClass.cast(action)) : Optional.empty();
    }
}