package com.armedia.acm.calendar.service.integration.exchange;

/*-
 * #%L
 * ACM Service: Exchange Integration Calendar Service
 * %%
 * Copyright (C) 2014 - 2018 ArkCase LLC
 * %%
 * This file is part of the ArkCase software. 
 * 
 * If the software was purchased under a paid ArkCase license, the terms of 
 * the paid license agreement will prevail.  Otherwise, the software is 
 * provided under the following open source license terms:
 * 
 * ArkCase is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *  
 * ArkCase is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with ArkCase. If not, see <http://www.gnu.org/licenses/>.
 * #L%
 */

import com.armedia.acm.calendar.service.AcmCalendar;
import com.armedia.acm.calendar.service.AcmCalendarEvent;
import com.armedia.acm.calendar.service.AcmCalendarEventInfo;
import com.armedia.acm.calendar.service.AcmCalendarInfo;
import com.armedia.acm.calendar.service.AcmEventAttachmentDTO;
import com.armedia.acm.calendar.service.CalendarServiceException;

import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.LogManager;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.time.ZonedDateTime;
import java.util.List;

import microsoft.exchange.webservices.data.core.ExchangeService;
import microsoft.exchange.webservices.data.core.PropertySet;
import microsoft.exchange.webservices.data.core.enumeration.property.DefaultExtendedPropertySet;
import microsoft.exchange.webservices.data.core.enumeration.property.MapiPropertyType;
import microsoft.exchange.webservices.data.core.service.folder.CalendarFolder;
import microsoft.exchange.webservices.data.core.service.item.Appointment;
import microsoft.exchange.webservices.data.property.complex.FileAttachment;
import microsoft.exchange.webservices.data.property.complex.FolderId;
import microsoft.exchange.webservices.data.property.complex.ItemId;
import microsoft.exchange.webservices.data.property.definition.ExtendedPropertyDefinition;

/**
 * @author Lazo Lazarev a.k.a. Lazarius Borg @ zerogravity Apr 12, 2017
 *
 */
public class ExchangeCalendar implements AcmCalendar
{

    private Logger log = LogManager.getLogger(getClass());

    private ExchangeService service;

    private CalendarEntityHandler handler;

    private String objectType;

    private String objectId;

    /**
     * @param service
     * @param handler
     * @param objectType
     * @param objectId
     */
    public ExchangeCalendar(ExchangeService service, CalendarEntityHandler handler, String objectType, String objectId)
    {
        this.service = service;
        this.handler = handler;
        this.objectType = objectType;
        this.objectId = objectId;
    }

    /*
     * (non-Javadoc)
     * @see com.armedia.acm.calendar.service.AcmCalendar#getInfo()
     */
    @Override
    public AcmCalendarInfo getInfo() throws CalendarServiceException
    {
        log.debug("Getting calendar info for object with id: [{}] of [{}] type.", objectId, objectType);
        try
        {
            String calendarId = handler.getCalendarId(objectId).orElseThrow(() -> new Exception(
                    String.format("No outlook folder associated with object of type [%s] with id [%s].", objectType, objectId)));
            CalendarFolder folder = CalendarFolder.bind(service, new FolderId(calendarId));
            // TODO: fill out the 'description' properly.
            return new AcmCalendarInfo(folder.getId().getUniqueId(), objectType, objectId, folder.getDisplayName(), "");
        }
        catch (Exception e)
        {
            log.warn("Error while trying to get calendar info for object with id: [{}] of [{}] type.", objectId, objectType, e);
            throw new CalendarServiceBindToRemoteException(e);
        }
    }

    /*
     * (non-Javadoc)
     * @see com.armedia.acm.calendar.service.AcmCalendar#listItems(java.time.ZonedDateTime, java.time.ZonedDateTime,
     * java.lang.String, java.lang.String, int, int)
     */
    @Override
    public List<AcmCalendarEventInfo> listItemsInfo(ZonedDateTime after, ZonedDateTime before, String sort, String sortDirection, int start,
            int maxItems) throws CalendarServiceException
    {
        return handler.listItemsInfo(service, objectId, after, before, sort, sortDirection, start, maxItems);
    }

    /*
     * (non-Javadoc)
     * @see com.armedia.acm.calendar.service.AcmCalendar#listItems(java.time.ZonedDateTime, java.time.ZonedDateTime,
     * java.lang.String, java.lang.String)
     */
    @Override
    public List<AcmCalendarEvent> listItems(ZonedDateTime after, ZonedDateTime before, String sort, String sortDirection, int start,
            int maxItems) throws CalendarServiceException
    {
        return handler.listItems(service, objectId, after, before, sort, sortDirection, start, maxItems);
    }

    /*
     * (non-Javadoc)
     * @see com.armedia.acm.calendar.service.AcmCalendar#getEvent(java.lang.String)
     */
    @Override
    public AcmCalendarEvent getEvent(String eventId, boolean retrieveMaster) throws CalendarServiceException
    {

        log.debug("Getting calendar item for event id [{}] for object with id: [{}] of [{}] type.", eventId, objectId, objectType);

        Appointment appointment;
        try
        {
            appointment = Appointment.bind(service, new ItemId(eventId));
        }
        catch (Exception e)
        {
            log.warn("Error while trying to bind to calendar folder for object with id: [{}] of [{}] type.", objectId, objectType, e);
            throw new CalendarServiceBindToRemoteException(e);
        }

        try
        {
            PropertySet allProperties = new PropertySet();
            allProperties.addRange(PropertyDefinitionHolder.standardProperties);
            ExtendedPropertyDefinition responseStatus = new ExtendedPropertyDefinition(DefaultExtendedPropertySet.Appointment, 0x8218,
                    MapiPropertyType.Integer);
            ExtendedPropertyDefinition replyTime = new ExtendedPropertyDefinition(DefaultExtendedPropertySet.Appointment, 0x8220,
                    MapiPropertyType.SystemTime);
            allProperties.add(responseStatus);
            allProperties.add(replyTime);
            appointment.load(allProperties);

            AcmCalendarEvent event = new AcmCalendarEvent();
            if (appointment.getIsRecurring())
            {
                Appointment recurringMaster = Appointment.bindToRecurringMaster(service, new ItemId(eventId));
                recurringMaster.load(allProperties);
                if (retrieveMaster)
                {
                    ExchangeTypesConverter.setEventProperties(event, recurringMaster);
                    return event;
                }
                appointment.setRecurrence(recurringMaster.getRecurrence());
            }

            ExchangeTypesConverter.setEventProperties(event, appointment);
            return event;
        }
        catch (Exception e)
        {
            log.warn("Error while trying to get event with {} id for object with id: {} of {} type.", eventId, objectId, objectType, e);
            throw new CalendarServiceException(e);
        }
    }

    /*
     * (non-Javadoc)
     * @see com.armedia.acm.calendar.service.AcmCalendar#getEventAttachment(java.lang.String, java.lang.String)
     */
    @Override
    public AcmEventAttachmentDTO getEventAttachment(String eventId, String attachmentId) throws CalendarServiceException
    {
        log.debug("Getting calendar item for event id [{}] for object with id: [{}] of [{}] type.", eventId, objectId, objectType);

        Appointment appointment;
        try
        {
            appointment = Appointment.bind(service, new ItemId(eventId));
        }
        catch (Exception e)
        {
            log.warn("Error while trying to bind to calendar folder for object with id: [{}] of [{}] type.", objectId, objectType, e);
            throw new CalendarServiceBindToRemoteException(e);
        }

        try
        {
            PropertySet allProperties = new PropertySet();
            allProperties.addRange(PropertyDefinitionHolder.standardProperties);
            appointment.load(allProperties);

            // throw an exception meaningful in this context
            FileAttachment attachment = (FileAttachment) appointment.getAttachments().getItems().stream()
                    .filter(att -> att.getId().equals(attachmentId)).findFirst().orElseThrow(() -> new CalendarServiceException(""));
            AcmEventAttachmentDTO acmAttachment = new AcmEventAttachmentDTO();
            acmAttachment.setMediaType(attachment.getContentType());
            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            attachment.load(baos);
            // TODO Technical debt, don't keep the byte array in memory
            byte[] binaryContent = baos.toByteArray();
            acmAttachment.setContent(new ByteArrayInputStream(binaryContent));
            acmAttachment.setContentLength(binaryContent.length);
            acmAttachment.setFileName(attachment.getName());

            return acmAttachment;

        }
        catch (Exception e)
        {
            log.warn("Error while trying to get event with {} id for object with id: {} of {} type.", eventId, objectId, objectType, e);
            throw new CalendarServiceException(e);
        }

    }

}