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/**
 * BSD 3-Clause License
 *
 * Copyright © 2018, viadee Unternehmensberatung GmbH
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * * Neither the name of the copyright holder nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package de.viadee.bpm.vPAV.processing.checker;

import java.util.ArrayList;
import java.util.Collection;

import org.camunda.bpm.model.bpmn.impl.BpmnModelConstants;
import org.camunda.bpm.model.bpmn.instance.BaseElement;
import org.camunda.bpm.model.bpmn.instance.Event;
import org.camunda.bpm.model.bpmn.instance.Message;
import org.camunda.bpm.model.bpmn.instance.MessageEventDefinition;

import de.viadee.bpm.vPAV.BpmnScanner;
import de.viadee.bpm.vPAV.Messages;
import de.viadee.bpm.vPAV.config.model.Rule;
import de.viadee.bpm.vPAV.output.IssueWriter;
import de.viadee.bpm.vPAV.processing.CheckName;
import de.viadee.bpm.vPAV.processing.model.data.BpmnElement;
import de.viadee.bpm.vPAV.processing.model.data.CheckerIssue;
import de.viadee.bpm.vPAV.processing.model.data.CriticalityEnum;

public class MessageEventChecker extends AbstractElementChecker {

    public MessageEventChecker(final Rule rule, final BpmnScanner bpmnScanner) {
        super(rule, bpmnScanner);
    }

    /**
     * Check MessageEvents for implementation and messages
     *
     * @return issues
     */
    @Override
    public Collection check(BpmnElement element) {

        final Collection issues = new ArrayList();
        final BaseElement baseElement = element.getBaseElement();

        if (baseElement.getElementType().getTypeName()
                .equals(BpmnModelConstants.BPMN_ELEMENT_END_EVENT)
                || baseElement.getElementType().getTypeName()
                        .equals(BpmnModelConstants.BPMN_ELEMENT_INTERMEDIATE_CATCH_EVENT)
                || baseElement.getElementType().getTypeName()
                        .equals(BpmnModelConstants.BPMN_ELEMENT_INTERMEDIATE_THROW_EVENT)
                || baseElement.getElementType().getTypeName()
                        .equals(BpmnModelConstants.BPMN_ELEMENT_BOUNDARY_EVENT)) {

            checkEventsInSubProcess(element, issues, baseElement);
        } else if (baseElement.getElementType().getTypeName().equals(BpmnModelConstants.BPMN_ELEMENT_RECEIVE_TASK)) {

            if (baseElement.getAttributeValue(BpmnModelConstants.BPMN_ATTRIBUTE_MESSAGE_REF) == null
                    || baseElement.getAttributeValue(BpmnModelConstants.BPMN_ATTRIBUTE_MESSAGE_REF).isEmpty()) {

                issues.addAll(IssueWriter.createIssue(rule, CriticalityEnum.ERROR, element,
                        String.format(Messages.getString("MessageEventChecker.0"), CheckName.checkName(baseElement)))); //$NON-NLS-1$

            } else {
                if (bpmnScanner.getMessageName(
                        baseElement.getAttributeValue(BpmnModelConstants.BPMN_ATTRIBUTE_MESSAGE_REF)) == null
                        || bpmnScanner
                                .getMessageName(
                                        baseElement.getAttributeValue(BpmnModelConstants.BPMN_ATTRIBUTE_MESSAGE_REF))
                                .isEmpty()) {
                    issues.addAll(IssueWriter.createIssue(rule, CriticalityEnum.ERROR, element,
                            String.format(Messages.getString("MessageEventChecker.1"), //$NON-NLS-1$
                                    CheckName.checkName(baseElement))));
                }
            }
        } else if (baseElement.getElementType().getTypeName()
                .equals(BpmnModelConstants.BPMN_ELEMENT_START_EVENT)) {

            // Depending on whether the startEvent is part of a subprocess, expressions may be allowed to exist
            if (bpmnScanner.checkStartEvent(baseElement.getAttributeValue(BpmnModelConstants.BPMN_ATTRIBUTE_ID))) {
                checkEventsInSubProcess(element, issues, baseElement);
            } else {
                checkEventsInProcess(element, issues, baseElement);
            }
        }
        return issues;
    }

    /**
     * Checks for existence of messages in startEvents. Expressions will create an issue due to write/read anomaly
     *
     * @param element
     *            BpmnElement
     * @param issues
     *            Collection of CheckerIssues
     * @param baseElement
     *            BaseElement
     */
    private void checkEventsInProcess(BpmnElement element, final Collection issues,
            final BaseElement baseElement) {
        final Event event = (Event) baseElement;
        final Collection messageEventDefinitions = event
                .getChildElementsByType(MessageEventDefinition.class);
        if (messageEventDefinitions != null) {
            for (MessageEventDefinition eventDef : messageEventDefinitions) {
                if (eventDef != null) {
                    final Message message = eventDef.getMessage();
                    if (message == null) {
                        issues.addAll(IssueWriter.createIssue(rule, CriticalityEnum.ERROR, element,
                                String.format(Messages.getString("MessageEventChecker.2"), //$NON-NLS-1$
                                        CheckName.checkName(baseElement))));
                    } else {
                        if (message.getName() == null || message.getName().isEmpty()) {
                            issues.addAll(IssueWriter.createIssue(rule, CriticalityEnum.ERROR, element,
                                    String.format(Messages.getString("MessageEventChecker.3"), //$NON-NLS-1$
                                            CheckName.checkName(baseElement))));
                        } else if (message.getName().contains("{") || message.getName().contains("}")) { //$NON-NLS-1$ //$NON-NLS-2$
                            issues.addAll(IssueWriter.createIssue(rule, CriticalityEnum.ERROR, element,
                                    String.format(Messages.getString("MessageEventChecker.6"), //$NON-NLS-1$
                                            CheckName.checkName(baseElement))));
                        }
                    }
                }
            }
        }
    }

    /**
     * Checks for existence of messages and expression in startEvents
     *
     * @param element
     *            BpmnElement
     * @param issues
     *            Collection of CheckerIssues
     * @param baseElement
     *            BaseElement
     */
    private void checkEventsInSubProcess(BpmnElement element, final Collection issues,
            final BaseElement baseElement) {
        final Event event = (Event) baseElement;
        final Collection messageEventDefinitions = event
                .getChildElementsByType(MessageEventDefinition.class);
        if (messageEventDefinitions != null) {
            for (MessageEventDefinition eventDef : messageEventDefinitions) {
                if (eventDef != null) {
                    final Message message = eventDef.getMessage();
                    if (message == null) {
                        issues.addAll(IssueWriter.createIssue(rule, CriticalityEnum.ERROR, element,
                                String.format(Messages.getString("MessageEventChecker.7"), //$NON-NLS-1$
                                        CheckName.checkName(baseElement))));
                    } else {
                        if (message.getName() == null || message.getName().isEmpty()) {
                            issues.addAll(IssueWriter.createIssue(rule, CriticalityEnum.ERROR, element,
                                    String.format(Messages.getString("MessageEventChecker.8"), //$NON-NLS-1$
                                            CheckName.checkName(baseElement))));
                        }
                    }
                }
            }
        }
    }

}




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