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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
 * under the License.
 */
package org.jbpm.compiler.canonical;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.jbpm.compiler.canonical.node.NodeVisitorBuilderService;
import org.jbpm.process.core.context.variable.VariableScope;
import org.jbpm.ruleflow.core.factory.ForEachNodeFactory;
import org.jbpm.workflow.core.Node;
import org.jbpm.workflow.core.impl.DataDefinition;
import org.jbpm.workflow.core.node.CompositeNode.NodeAndType;
import org.jbpm.workflow.core.node.ForEachNode;

import com.github.javaparser.ast.expr.BooleanLiteralExpr;
import com.github.javaparser.ast.expr.StringLiteralExpr;
import com.github.javaparser.ast.stmt.BlockStmt;

import static org.jbpm.ruleflow.core.factory.CompositeContextNodeFactory.METHOD_LINK_INCOMING_CONNECTIONS;
import static org.jbpm.ruleflow.core.factory.CompositeContextNodeFactory.METHOD_LINK_OUTGOING_CONNECTIONS;
import static org.jbpm.ruleflow.core.factory.ForEachNodeFactory.METHOD_COLLECTION_EXPRESSION;
import static org.jbpm.ruleflow.core.factory.ForEachNodeFactory.METHOD_INPUT_VARIABLE;
import static org.jbpm.ruleflow.core.factory.ForEachNodeFactory.METHOD_OUTPUT_COLLECTION_EXPRESSION;
import static org.jbpm.ruleflow.core.factory.ForEachNodeFactory.METHOD_OUTPUT_TEMP;
import static org.jbpm.ruleflow.core.factory.ForEachNodeFactory.METHOD_OUTPUT_VARIABLE;
import static org.jbpm.ruleflow.core.factory.ForEachNodeFactory.METHOD_SEQUENTIAL;

public class ForEachNodeVisitor extends AbstractCompositeNodeVisitor {

    public ForEachNodeVisitor(NodeVisitorBuilderService nodeVisitorService) {
        super(nodeVisitorService);
    }

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

    @Override
    public void visitNode(String factoryField, ForEachNode node, BlockStmt body, VariableScope variableScope, ProcessMetaData metadata) {
        body.addStatement(getAssignedFactoryMethod(factoryField, ForEachNodeFactory.class, getNodeId(node), getNodeKey(), getWorkflowElementConstructor(node.getId())))
                .addStatement(getNameMethod(node, "ForEach"));

        body.addStatement(getFactoryMethod(getNodeId(node), METHOD_SEQUENTIAL, new BooleanLiteralExpr(node.isSequential())));

        visitMetaData(node.getMetaData(), body, getNodeId(node));

        body.addStatement(getFactoryMethod(getNodeId(node), METHOD_OUTPUT_TEMP,
                new StringLiteralExpr("foreach_output"),
                buildDataResolver("java.util.Collection")));

        DataDefinition output = node.getMultiInstanceSpecification().getOutputDataItem();

        if (output != null) {
            body.addStatement(getFactoryMethod(getNodeId(node), METHOD_OUTPUT_VARIABLE,
                    new StringLiteralExpr(output.getId()),
                    new StringLiteralExpr(output.getLabel()),
                    buildDataResolver(output.getType())));
        }

        DataDefinition input = node.getMultiInstanceSpecification().getInputDataItem();
        if (input != null) {
            body.addStatement(getFactoryMethod(getNodeId(node), METHOD_INPUT_VARIABLE,
                    new StringLiteralExpr(input.getId()),
                    new StringLiteralExpr(input.getLabel()),
                    buildDataResolver(input.getType())));
        }

        body.addStatement(getFactoryMethod(getNodeId(node), METHOD_COLLECTION_EXPRESSION, new StringLiteralExpr(stripExpression(node.getCollectionExpression()))));

        if (node.getOutputCollectionExpression() != null) {
            body.addStatement(getFactoryMethod(getNodeId(node), METHOD_OUTPUT_COLLECTION_EXPRESSION, new StringLiteralExpr(stripExpression(node.getOutputCollectionExpression()))));
        }

        if (node.getOutputVariableName() != null) {
            body.addStatement(getFactoryMethod(getNodeId(node), METHOD_OUTPUT_TEMP, new StringLiteralExpr(node.getOutputVariableName()),
                    buildDataResolver(node.getOutputVariableType().getStringType())));
        }

        if (node.getCompletionAction() instanceof ExpressionSupplier) {
            body.addStatement(getFactoryMethod(getNodeId(node), "completionAction", ((ExpressionSupplier) node.getCompletionAction()).get(node, metadata)));
        }

        // visit nodes
        visitNodes(getNodeId(node), node.getNodes(), body, ((VariableScope) node.getCompositeNode().getDefaultContext(VariableScope.VARIABLE_SCOPE)), metadata);

        List filterNodes = new ArrayList<>(Arrays.asList(node.getNodes()));

        NodeAndType incomingNode = node.getLinkedIncomingNode(Node.CONNECTION_DEFAULT_TYPE);
        if (incomingNode != null) {
            body.addStatement(getFactoryMethod(getNodeId(node), METHOD_LINK_INCOMING_CONNECTIONS, getWorkflowElementConstructor(incomingNode.getNodeId())));
            filterNodes.removeIf(n -> n.getId().equals(incomingNode.getNodeId()));
        }
        NodeAndType outgoingNode = node.getLinkedOutgoingNode(Node.CONNECTION_DEFAULT_TYPE);
        if (outgoingNode != null) {
            body.addStatement(getFactoryMethod(getNodeId(node), METHOD_LINK_OUTGOING_CONNECTIONS, getWorkflowElementConstructor(outgoingNode.getNodeId())));
            filterNodes.removeIf(n -> n.getId().equals(outgoingNode.getNodeId()));
        }

        visitConnections(getNodeId(node), filterNodes.toArray(new Node[filterNodes.size()]), body);

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