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/*-
 * ============LICENSE_START=======================================================
 * SDC
 * ================================================================================
 * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * 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.
 * ============LICENSE_END=========================================================
 */
package org.openecomp.sdc.conflicts.impl;

import java.util.Optional;
import org.openecomp.conflicts.ItemMergeHandler;
import org.openecomp.conflicts.ItemMergeHandlerFactory;
import org.openecomp.conflicts.dao.ConflictsDao;
import org.openecomp.conflicts.types.Conflict;
import org.openecomp.conflicts.types.ConflictResolution;
import org.openecomp.conflicts.types.ItemVersionConflict;
import org.openecomp.conflicts.types.Resolution;
import org.openecomp.sdc.common.errors.CoreException;
import org.openecomp.sdc.common.errors.ErrorCategory;
import org.openecomp.sdc.common.errors.ErrorCode;
import org.openecomp.sdc.conflicts.ConflictsManager;
import org.openecomp.sdc.versioning.dao.types.Version;

public class ConflictsManagerImpl implements ConflictsManager {

    private static final String ELEMENT_CONFLICT_NOT_EXIST_ERR_ID = "ELEMENT_CONFLICT_NOT_EXIST";
    private static final String ELEMENT_CONFLICT_NOT_EXISTS_MSG = "Item Id %s, version Id %s, element conflict with Id %s does not exists.";
    private final ConflictsDao conflictsDao;

    public ConflictsManagerImpl(ConflictsDao conflictsDao) {
        this.conflictsDao = conflictsDao;
    }

    @Override
    public boolean isConflicted(String itemId, Version version) {
        Optional<ItemMergeHandler> itemMergeHandler = ItemMergeHandlerFactory.getInstance().createInterface(itemId);
        return conflictsDao.isConflicted(itemId, version) || (itemMergeHandler.isPresent() && itemMergeHandler.get().isConflicted(itemId, version));
    }

    @Override
    public ItemVersionConflict getConflict(String itemId, Version version) {
        ItemVersionConflict conflicts = conflictsDao.getConflict(itemId, version);
        ItemMergeHandlerFactory.getInstance().createInterface(itemId)
            .ifPresent(itemMergeHandler -> itemMergeHandler.postListConflicts(itemId, version, conflicts));
        return conflicts;
    }

    @Override
    public void finalizeMerge(String itemId, Version version) {
        ItemMergeHandlerFactory.getInstance().createInterface(itemId).ifPresent(mergeHandler -> mergeHandler.finalizeMerge(itemId, version));
    }

    @Override
    public Conflict getConflict(String itemId, Version version, String conflictId) {
        Optional<ItemMergeHandler> itemMergeHandler = ItemMergeHandlerFactory.getInstance().createInterface(itemId);
        if (itemMergeHandler.isPresent()) {
            Optional<Conflict> conflict = itemMergeHandler.get().getConflict(itemId, version, conflictId);
            if (conflict.isPresent()) {
                return conflict.get();
            }
        }
        Conflict conflict = conflictsDao.getConflict(itemId, version, conflictId);
        itemMergeHandler.ifPresent(mergeHandler -> mergeHandler.postGetConflict(itemId, version, conflict));
        if (conflict == null) {
            throw getConflictNotExistException(itemId, version, conflictId);
        }
        return conflict;
    }

    @Override
    public void resolveConflict(String itemId, Version version, String conflictId, ConflictResolution resolution) {
        if (Resolution.OTHER.equals(resolution.getResolution())) {
            throw new UnsupportedOperationException("Resolution other than 'THEIRS' or 'YOURS' is not supported.");
        }
        Optional<ItemMergeHandler> itemMergeHandler = ItemMergeHandlerFactory.getInstance().createInterface(itemId);
        if (!itemMergeHandler.isPresent() || !itemMergeHandler.get().resolveConflict(itemId, version, conflictId, resolution)) {
            getConflict(itemId, version, conflictId); // validate that the conflict exist
            itemMergeHandler.ifPresent(mergeHandler -> mergeHandler.preResolveConflict(itemId, version, conflictId, resolution));
            conflictsDao.resolveConflict(itemId, version, conflictId, resolution);
        }
    }

    private CoreException getConflictNotExistException(String itemId, Version version, String conflictId) {
        return new CoreException(new ErrorCode.ErrorCodeBuilder().withCategory(ErrorCategory.APPLICATION).withId(ELEMENT_CONFLICT_NOT_EXIST_ERR_ID)
            .withMessage(String.format(ELEMENT_CONFLICT_NOT_EXISTS_MSG, itemId, version.getId(), conflictId)).build());
    }
}