/*
 * Copyright © 2018 European Support Limited
 *
 * 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.openecomp.sdcrests.vendorlicense.rest.services;

import org.openecomp.core.dao.UniqueValueDaoFactory;
import org.openecomp.core.util.UniqueValueUtil;
import org.openecomp.sdc.activitylog.ActivityLogManager;
import org.openecomp.sdc.activitylog.ActivityLogManagerFactory;
import org.openecomp.sdc.activitylog.dao.type.ActivityLogEntity;
import org.openecomp.sdc.activitylog.dao.type.ActivityType;
import org.openecomp.sdc.common.errors.CoreException;
import org.openecomp.sdc.common.errors.ErrorCode;
import org.openecomp.sdc.common.errors.Messages;
import org.openecomp.sdc.datatypes.model.ItemType;
import org.openecomp.sdc.healing.factory.HealingManagerFactory;
import org.openecomp.sdc.itempermissions.ItemPermissionsManager;
import org.openecomp.sdc.itempermissions.ItemPermissionsManagerFactory;
import org.openecomp.sdc.itempermissions.impl.types.PermissionTypes;
import org.openecomp.sdc.logging.api.Logger;
import org.openecomp.sdc.logging.api.LoggerFactory;
import org.openecomp.sdc.notification.dtos.Event;
import org.openecomp.sdc.notification.factories.NotificationPropagationManagerFactory;
import org.openecomp.sdc.notification.services.NotificationPropagationManager;
import org.openecomp.sdc.vendorlicense.VendorLicenseConstants;
import org.openecomp.sdc.vendorlicense.VendorLicenseManager;
import org.openecomp.sdc.vendorlicense.VendorLicenseManagerFactory;
import org.openecomp.sdc.vendorlicense.dao.types.VendorLicenseModelEntity;
import org.openecomp.sdc.versioning.AsdcItemManager;
import org.openecomp.sdc.versioning.AsdcItemManagerFactory;
import org.openecomp.sdc.versioning.VersioningManager;
import org.openecomp.sdc.versioning.VersioningManagerFactory;
import org.openecomp.sdc.versioning.dao.types.Version;
import org.openecomp.sdc.versioning.dao.types.VersionStatus;
import org.openecomp.sdc.versioning.types.Item;
import org.openecomp.sdc.versioning.types.NotificationEventTypes;
import org.openecomp.sdcrests.item.rest.mapping.MapItemToDto;
import org.openecomp.sdcrests.item.rest.mapping.MapVersionToDto;
import org.openecomp.sdcrests.item.types.ItemCreationDto;
import org.openecomp.sdcrests.item.types.ItemDto;
import org.openecomp.sdc.versioning.types.ItemStatus;
import org.openecomp.sdcrests.item.types.VersionDto;
import org.openecomp.sdcrests.vendorlicense.rest.VendorLicenseModels;
import org.openecomp.sdcrests.vendorlicense.rest.mapping.MapVendorLicenseModelEntityToDto;
import org.openecomp.sdcrests.vendorlicense.rest.mapping.MapVendorLicenseModelRequestDtoToVendorLicenseModelEntity;
import org.openecomp.sdcrests.vendorlicense.types.VendorLicenseModelActionRequestDto;
import org.openecomp.sdcrests.vendorlicense.types.VendorLicenseModelEntityDto;
import org.openecomp.sdcrests.vendorlicense.types.VendorLicenseModelRequestDto;
import org.openecomp.sdcrests.wrappers.GenericCollectionWrapper;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Service;
import org.springframework.validation.annotation.Validated;

import javax.inject.Named;
import javax.ws.rs.core.Response;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import java.util.function.Predicate;

import static org.openecomp.sdc.itempermissions.notifications.NotificationConstants.PERMISSION_USER;
import static org.openecomp.sdc.versioning.VersioningNotificationConstansts.ITEM_ID;
import static org.openecomp.sdc.versioning.VersioningNotificationConstansts.ITEM_NAME;
import static org.openecomp.sdc.versioning.VersioningNotificationConstansts.SUBMIT_DESCRIPTION;
import static org.openecomp.sdc.versioning.VersioningNotificationConstansts.VERSION_ID;
import static org.openecomp.sdc.versioning.VersioningNotificationConstansts.VERSION_NAME;
import static org.openecomp.sdcrests.vendorlicense.types.VendorLicenseModelActionRequestDto.VendorLicenseModelAction.Submit;

@Named
@Service("vendorLicenseModels")
@Scope(value = "prototype")
@Validated
public class VendorLicenseModelsImpl implements VendorLicenseModels {

  private static final String SUBMIT_ITEM_ACTION = "Submit_Item";
  private static final String SUBMIT_HEALED_VERSION_ERROR =
      "VLM Id %s: Error while submitting version %s created based on Certified version %s for healing purpose.";
  private static final Logger LOGGER = LoggerFactory.getLogger(VendorLicenseModelsImpl.class);
  private ItemPermissionsManager permissionsManager = ItemPermissionsManagerFactory.getInstance()
      .createInterface();
  private NotificationPropagationManager notifier =
      NotificationPropagationManagerFactory.getInstance().createInterface();

  private AsdcItemManager asdcItemManager = AsdcItemManagerFactory.getInstance().createInterface();
  private VersioningManager versioningManager =
      VersioningManagerFactory.getInstance().createInterface();
  private VendorLicenseManager vendorLicenseManager =
      VendorLicenseManagerFactory.getInstance().createInterface();
  private ActivityLogManager activityLogManager =
      ActivityLogManagerFactory.getInstance().createInterface();
  private UniqueValueUtil uniqueValueUtil = new UniqueValueUtil(UniqueValueDaoFactory.getInstance()
      .createInterface());

  @Override
  public Response listLicenseModels(String versionStatus,String itemStatus, String user) {
    Predicate<Item> itemPredicate = createItemPredicate(versionStatus, itemStatus, user);

    GenericCollectionWrapper<ItemDto> results = new GenericCollectionWrapper<>();
    MapItemToDto mapper = new MapItemToDto();
    asdcItemManager.list(itemPredicate).stream()
        .sorted((o1, o2) -> o2.getModificationTime().compareTo(o1.getModificationTime()))
        .forEach(vspItem -> results.add(mapper.applyMapping(vspItem, ItemDto.class)));
    return Response.ok(results).build();
  }

  @Override
  public Response createLicenseModel(VendorLicenseModelRequestDto request, String user) {

    Item item = new Item();
    item.setType(ItemType.vlm.name());
    item.setOwner(user);
    item.setStatus(ItemStatus.ACTIVE);
    item.setName(request.getVendorName());
    item.setDescription(request.getDescription());

    uniqueValueUtil
        .validateUniqueValue(VendorLicenseConstants.UniqueValues.VENDOR_NAME, item.getName());
    item = asdcItemManager.create(item);
    uniqueValueUtil
        .createUniqueValue(VendorLicenseConstants.UniqueValues.VENDOR_NAME, item.getName());

    Version version = versioningManager.create(item.getId(), new Version(), null);

    VendorLicenseModelEntity vlm = new MapVendorLicenseModelRequestDtoToVendorLicenseModelEntity()
        .applyMapping(request, VendorLicenseModelEntity.class);
    vlm.setId(item.getId());
    vlm.setVersion(version);

    vendorLicenseManager.createVendorLicenseModel(vlm);
    versioningManager.publish(item.getId(), version, "Initial vlm:" + vlm.getVendorName());

    ItemCreationDto itemCreationDto = new ItemCreationDto();
    itemCreationDto.setItemId(item.getId());
    itemCreationDto.setVersion(new MapVersionToDto().applyMapping(version, VersionDto.class));

    activityLogManager.logActivity(new ActivityLogEntity(vlm.getId(), version,
        ActivityType.Create, user, true, "", ""));
    return Response.ok(itemCreationDto).build();
  }

  @Override
  public Response updateLicenseModel(VendorLicenseModelRequestDto request, String vlmId,
                                     String versionId, String user) {
    VendorLicenseModelEntity vlm =
        new MapVendorLicenseModelRequestDtoToVendorLicenseModelEntity()
            .applyMapping(request, VendorLicenseModelEntity.class);
    vlm.setId(vlmId);
    vlm.setVersion(new Version(versionId));

    vendorLicenseManager.updateVendorLicenseModel(vlm);
    return Response.ok().build();
  }

  @Override
  public Response getLicenseModel(String vlmId, String versionId, String user) {
    Version version = versioningManager.get(vlmId, new Version(versionId));
    VendorLicenseModelEntity vlm = vendorLicenseManager.getVendorLicenseModel(vlmId, version);
    vlm.setWritetimeMicroSeconds(version.getModificationTime().getTime());

    try {
      Optional<Version> healedVersion = HealingManagerFactory.getInstance().createInterface()
          .healItemVersion(vlmId, version, ItemType.vlm, false);

      if (healedVersion.isPresent()) {
        vlm.setVersion(healedVersion.get());
        if (version.getStatus() == VersionStatus.Certified) {
          submitHealedVersion(vlmId, healedVersion.get(), versionId, user);
        }
      }
    } catch (Exception e) {
      LOGGER.error(
          String.format("Error while auto healing VLM with Id %s and version %s", vlmId, versionId),
          e);
    }

    VendorLicenseModelEntityDto vlmDto =
        new MapVendorLicenseModelEntityToDto().applyMapping(vlm, VendorLicenseModelEntityDto.class);
    return Response.ok(vlmDto).build();
  }

  @Override
  public Response deleteLicenseModel(String vlmId, String user) {
    Item vlm = asdcItemManager.get(vlmId);

    if (!vlm.getType().equals(ItemType.vlm.name())){
      throw new CoreException((new ErrorCode.ErrorCodeBuilder()
              .withMessage(String.format("Vlm with id %s does not exist.",
                      vlmId)).build()));
    }

    Integer certifiedVersionsCounter = vlm.getVersionStatusCounters().get(VersionStatus.Certified);
    if (Objects.isNull(certifiedVersionsCounter) || certifiedVersionsCounter == 0) {
      asdcItemManager.delete(vlm);
      permissionsManager.deleteItemPermissions(vlmId);
      uniqueValueUtil
          .deleteUniqueValue(VendorLicenseConstants.UniqueValues.VENDOR_NAME, vlm.getName());
      notifyUsers(vlmId, vlm.getName(), null, null, user,
          NotificationEventTypes.DELETE);

      return Response.ok().build();
    } else {
      return Response.status(Response.Status.FORBIDDEN)
          .entity(new Exception(Messages.DELETE_VLM_ERROR.getErrorMessage())).build();
    }
  }

  @Override
  public Response actOnLicenseModel(VendorLicenseModelActionRequestDto request, String vlmId,
                                    String versionId, String user) {
    Version version = new Version(versionId);

    if (request.getAction() == Submit) {
      if (!permissionsManager.isAllowed(vlmId, user, SUBMIT_ITEM_ACTION)) {
        return Response.status(Response.Status.FORBIDDEN)
            .entity(new Exception(Messages.PERMISSIONS_ERROR.getErrorMessage())).build();
      }
      String message =
          request.getSubmitRequest() == null ? "Submit" : request.getSubmitRequest().getMessage();
      submit(vlmId, version, message, user);

      notifyUsers(vlmId, null, version, message, user, NotificationEventTypes.SUBMIT);

    }
    return Response.ok().build();
  }

  private void submit(String vlmId, Version version, String message, String user) {

    vendorLicenseManager.validate(vlmId, version);
    versioningManager.submit(vlmId, version, message);

    activityLogManager.logActivity(
        new ActivityLogEntity(vlmId, version, ActivityType.Submit, user, true, "", message));
  }

  private void submitHealedVersion(String vlmId, Version healedVersion, String baseVersionId,
                                   String user) {
    try {
      submit(vlmId, healedVersion, "Submit after heal", user);
    } catch (Exception ex) {
      LOGGER.error(
          String.format(SUBMIT_HEALED_VERSION_ERROR, vlmId, healedVersion.getId(), baseVersionId),
          ex);
    }
  }

  private void notifyUsers(String itemId, String itemName, Version version, String message,
                           String userName, NotificationEventTypes eventType) {
    Map<String, Object> eventProperties = new HashMap<>();
    eventProperties.put(ITEM_NAME, itemName == null ? asdcItemManager.get(itemId).getName() : itemName);
    eventProperties.put(ITEM_ID, itemId);

    if (version != null) {
      eventProperties.put(VERSION_NAME, version.getName() == null
          ? versioningManager.get(itemId, version).getName()
          : version.getName());
      eventProperties.put(VERSION_ID, version.getId());
    }

    eventProperties.put(SUBMIT_DESCRIPTION, message);
    eventProperties.put(PERMISSION_USER, userName);

    Event syncEvent = new SyncEvent(eventType.getEventName(), itemId, eventProperties, itemId);
    try {
      notifier.notifySubscribers(syncEvent, userName);
    } catch (Exception e) {
      LOGGER.error("Failed to send sync notification to users subscribed o item '" + itemId);
    }
  }

  private class SyncEvent implements Event {

    private String eventType;
    private String originatorId;
    private Map<String, Object> attributes;
    private String entityId;

    SyncEvent(String eventType, String originatorId,
              Map<String, Object> attributes, String entityId) {
      this.eventType = eventType;
      this.originatorId = originatorId;
      this.attributes = attributes;
      this.entityId = entityId;
    }

    @Override
    public String getEventType() {
      return eventType;
    }

    @Override
    public String getOriginatorId() {
      return originatorId;
    }

    @Override
    public Map<String, Object> getAttributes() {
      return attributes;
    }

    @Override
    public String getEntityId() {
      return entityId;
    }
  }

  private boolean userHasPermission(String itemId, String userId) {
    String permission = permissionsManager.getUserItemPermiission(itemId, userId);
    return (permission != null && permission
        .matches(PermissionTypes.Contributor.name() + "|" + PermissionTypes.Owner.name()));
  }

  private Predicate<Item> createItemPredicate(String versionStatus,
                                              String itemStatus,
                                              String user) {
    Predicate<Item> itemPredicate = item -> ItemType.vlm.name().equals(item.getType());

    if (ItemStatus.ARCHIVED.name().equals(itemStatus)) {
      itemPredicate = itemPredicate.and(item -> ItemStatus.ARCHIVED.equals(item.getStatus()));
    } else {
      itemPredicate = itemPredicate.and(item -> ItemStatus.ACTIVE.equals(item.getStatus()));

      if (VersionStatus.Certified.name().equals(versionStatus)) {
        itemPredicate = itemPredicate
                .and(item -> item.getVersionStatusCounters().containsKey(VersionStatus.Certified));

      } else if (VersionStatus.Draft.name().equals(versionStatus)) {
        itemPredicate = itemPredicate.and(
                item -> item.getVersionStatusCounters().containsKey(VersionStatus.Draft)
                        &&  userHasPermission(item.getId(), user));
      }
    }
    return itemPredicate;
  }

}