/*******************************************************************************
 * 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.apache.ofbiz.service.mail;

import java.io.IOException;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

import javax.mail.Address;
import javax.mail.BodyPart;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Part;
import javax.mail.internet.MimeMessage;

import org.apache.ofbiz.base.util.Debug;
import org.apache.ofbiz.base.util.UtilMisc;
import org.apache.ofbiz.entity.GenericValue;
import org.apache.ofbiz.service.GenericServiceException;
import org.apache.ofbiz.service.LocalDispatcher;
import org.apache.ofbiz.service.ServiceUtil;
import org.w3c.dom.Element;

@SuppressWarnings("serial")
public class ServiceMcaCondition implements java.io.Serializable {

    public static final String module = ServiceMcaCondition.class.getName();
    public static final int CONDITION_FIELD = 1;
    public static final int CONDITION_HEADER = 2;
    public static final int CONDITION_SERVICE = 3;

    protected String serviceName = null;
    protected String headerName = null;
    protected String fieldName = null;
    protected String operator = null;
    protected String value = null;

    public ServiceMcaCondition(Element condElement, int condType) {
        switch (condType) {
            case CONDITION_FIELD:
                // fields: from|to|subject|body|sent-date|receieved-date
                this.fieldName = condElement.getAttribute("field-name");
                // operators: equals|not-equals|empty|not-empty|matches|not-matches
                this.operator = condElement.getAttribute("operator");
                // value to compare
                this.value = condElement.getAttribute("value");
                break;
            case CONDITION_HEADER:
                // free form header name
                this.headerName = condElement.getAttribute("header-name");
                // operators: equals|not-equals|empty|not-empty|matches|not-matches
                this.operator = condElement.getAttribute("operator");
                // value to compare
                this.value = condElement.getAttribute("value");
                break;
            case CONDITION_SERVICE:
                this.serviceName = condElement.getAttribute("service-name");
                break;
            default:
                Debug.logWarning("There was an error in the switch-case in ServiceMcaCondition", module);
        }
    }

    public boolean eval(LocalDispatcher dispatcher, MimeMessageWrapper messageWrapper, GenericValue userLogin) {
        boolean passedCondition = false;
        if (serviceName != null) {
            Map<String, Object> result = null;
            try {
                result = dispatcher.runSync(serviceName, UtilMisc.<String, Object>toMap("messageWrapper", messageWrapper, "userLogin", userLogin));
            } catch (GenericServiceException e) {
                Debug.logError(e, module);
                return false;
            }
            if (result == null) {
                Debug.logError("Service MCA Condition Service [" + serviceName + "] returned null!", module);
                return false;
            }
            if (ServiceUtil.isError(result)) {
                Debug.logError(ServiceUtil.getErrorMessage(result), module);
                return false;
            }
            Boolean reply = (Boolean) result.get("conditionReply");
            if (reply == null) {
                reply = Boolean.FALSE;
            }
            return reply;
        } else if (headerName != null) {
            // compare the header field
            MimeMessage message = messageWrapper.getMessage();
            String[] headerValues = null;
            try {
                headerValues = message.getHeader(headerName);
            } catch (MessagingException e) {
                Debug.logError(e, module);
            }

            if (headerValues != null) {
                for (String headerValue: headerValues) {
                    if ("equals".equals(operator)) {
                        if (headerValue.equals(value)) {
                            passedCondition = true;
                            break;
                        }
                    } else if ("not-equals".equals(operator)) {
                        if (!headerValue.equals(value)) {
                            passedCondition = true;
                        } else {
                            passedCondition = false;
                        }
                    } else if ("matches".equals(operator)) {
                        if (headerValue.matches(value)) {
                            passedCondition = true;
                            break;
                        }
                    } else if ("not-matches".equals(operator)) {
                        if (!headerValue.matches(value)) {
                            passedCondition = true;
                        } else {
                            passedCondition = false;
                        }
                    } else if ("not-empty".equals(operator)) {
                        passedCondition = true;
                        break;
                    }
                }
            } else if ("empty".equals(operator)) {
                passedCondition = true;
            }
        } else if (fieldName != null) {
            MimeMessage message = messageWrapper.getMessage();
            String[] fieldValues = null;
            try {
                fieldValues = this.getFieldValue(message, fieldName);
            } catch (MessagingException | IOException e) {
                Debug.logError(e, module);
            }

            if (fieldValues != null) {
                for (String fieldValue: fieldValues) {
                    if ("equals".equals(operator)) {
                        if (fieldValue.equals(value)) {
                            passedCondition = true;
                            break;
                        }
                    } else if ("not-equals".equals(operator)) {
                        if (!fieldValue.equals(value)) {
                            passedCondition = true;
                        } else {
                            passedCondition = false;
                        }
                    } else if ("matches".equals(operator)) {
                        if (fieldValue.matches(value)) {
                            passedCondition = true;
                            break;
                        }
                    } else if ("not-matches".equals(operator)) {
                        if (!fieldValue.matches(value)) {
                            passedCondition = true;
                        } else {
                            passedCondition = false;
                        }
                    } else if ("not-empty".equals(operator)) {
                        passedCondition = true;
                        break;
                    }
                }
            } else if ("empty".equals(operator)) {
                passedCondition = true;
            }
        } else {
            passedCondition = false;
        }

        return passedCondition;
    }

    protected String[] getFieldValue(MimeMessage message, String fieldName) throws MessagingException, IOException {
        String[] values = null;
        if ("to".equals(fieldName)) {
            Address[] addrs = message.getRecipients(MimeMessage.RecipientType.TO);
            if (addrs != null) {
                values = new String[addrs.length];
                for (int i = 0; i < addrs.length; i++) {
                    values[i] = addrs[i].toString();
                }
            }
        } else if ("cc".equals(fieldName)) {
            Address[] addrs = message.getRecipients(MimeMessage.RecipientType.CC);
            if (addrs != null) {
                values = new String[addrs.length];
                for (int i = 0; i < addrs.length; i++) {
                    values[i] = addrs[i].toString();
                }
            }
        } else if ("bcc".equals(fieldName)) {
            Address[] addrs = message.getRecipients(MimeMessage.RecipientType.BCC);
            if (addrs != null) {
                values = new String[addrs.length];
                for (int i = 0; i < addrs.length; i++) {
                    values[i] = addrs[i].toString();
                }
            }
        } else if ("from".equals(fieldName)) {
            Address[] addrs = message.getFrom();
            if (addrs != null) {
                values = new String[addrs.length];
                for (int i = 0; i < addrs.length; i++) {
                    values[i] = addrs[i].toString();
                }
            }
        } else if ("subject".equals(fieldName)) {
            values = new String[1];
            values[0] = message.getSubject();
        } else if ("send-date".equals(fieldName)) {
            values = new String[1];
            values[0] = message.getSentDate().toString();
        } else if ("received-date".equals(fieldName)) {
            values = new String[1];
            values[0] = message.getReceivedDate().toString();
        } else if ("body".equals(fieldName)) {
            List<String> bodyParts = this.getBodyText(message);
            values = bodyParts.toArray(new String[bodyParts.size()]);
        }
        return values;
    }

    private List<String> getBodyText(Part part) throws MessagingException, IOException {
        Object c = part.getContent();
        if (c instanceof String) {
            return UtilMisc.toList((String) c);
        } else if (c instanceof Multipart) {
            List<String> textContent = new LinkedList<>();
            int count = ((Multipart) c).getCount();
            for (int i = 0; i < count; i++) {
                BodyPart bp = ((Multipart) c).getBodyPart(i);
                textContent.addAll(this.getBodyText(bp));
            }
            return textContent;
        } else {
            return new LinkedList<>();
        }
    }
}
