/*
 * Copyright 2020 Red Hat, Inc. and/or its affiliates.
 *
 * 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.jbpm.compiler.canonical;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Map;
import java.util.stream.Stream;

import org.jbpm.process.core.context.variable.VariableScope;
import org.jbpm.ruleflow.core.factory.DynamicNodeFactory;
import org.jbpm.workflow.core.node.DynamicNode;
import org.kie.api.definition.process.Node;

import com.github.javaparser.ast.expr.MethodCallExpr;

import static org.jbpm.ruleflow.core.factory.DynamicNodeFactory.METHOD_ACTIVATION_EXPRESSION;
import static org.jbpm.ruleflow.core.factory.DynamicNodeFactory.METHOD_COMPLETION_EXPRESSION;
import static org.jbpm.ruleflow.core.factory.DynamicNodeFactory.METHOD_LANGUAGE;

public class DynamicNodeVisitor extends CompositeContextNodeVisitor<DynamicNode> {

    public DynamicNodeVisitor(Map<Class<?>, AbstractNodeVisitor<? extends Node>> nodesVisitors) {
        super(nodesVisitors);
    }

    @Override
    protected Class<?> factoryClass() {
        return DynamicNodeFactory.class;
    }

    @Override
    protected String factoryMethod() {
        return "dynamicNode";
    }

    @Override
    protected String getDefaultName() {
        return "Dynamic";
    }

    @Override
    public Stream<MethodCallExpr> visitCustomFields(DynamicNode node, VariableScope variableScope) {
        Collection<MethodCallExpr> methods = new ArrayList<>();
        methods.add(getFactoryMethod(getNodeId(node), METHOD_LANGUAGE, getOrNullExpr(node.getLanguage())));
        if (node.getActivationCondition() != null && !node.getActivationCondition().trim().isEmpty()) {
            methods.add(getActivationConditionStatement(node, variableScope));
        }
        if (node.getCompletionCondition() != null && !node.getCompletionCondition().trim().isEmpty()) {
            methods.add(getCompletionConditionStatement(node, variableScope));
        }
        return methods.stream();
    }

    private MethodCallExpr getActivationConditionStatement(DynamicNode node, VariableScope scope) {
        return getFactoryMethod(getNodeId(node), METHOD_ACTIVATION_EXPRESSION, createLambdaExpr(node.getActivationCondition(), scope));
    }

    private MethodCallExpr getCompletionConditionStatement(DynamicNode node, VariableScope scope) {
        return getFactoryMethod(getNodeId(node), METHOD_COMPLETION_EXPRESSION, createLambdaExpr(node.getCompletionCondition(), scope));
    }
}
