/****************************************************************
 * 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.james.dlp.api;

import java.util.Iterator;
import java.util.Objects;

import com.google.common.base.MoreObjects;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;

public class DLPRules implements Iterable<DLPConfigurationItem> {

    public static final class DuplicateRulesIdsException extends RuntimeException {
    }

    private final ImmutableList<DLPConfigurationItem> items;

    public DLPRules(ImmutableList<DLPConfigurationItem> items) throws DuplicateRulesIdsException {
        Preconditions.checkNotNull(items);
        checkNotContainDuplicateIds(items);

        this.items = items;
    }

    private void checkNotContainDuplicateIds(ImmutableList<DLPConfigurationItem> items) throws DuplicateRulesIdsException {
        long uniqueIdCount = items.stream()
            .map(DLPConfigurationItem::getId)
            .distinct()
            .count();

        if (uniqueIdCount != items.size()) {
            throw new DuplicateRulesIdsException();
        }
    }

    public ImmutableList<DLPConfigurationItem> getItems() {
        return items;
    }

    @Override
    public Iterator<DLPConfigurationItem> iterator() {
        return items.iterator();
    }

    @Override
    public final boolean equals(Object o) {
        if (o instanceof DLPRules) {
            DLPRules dlpConfiguration = (DLPRules) o;

            return Objects.equals(this.items, dlpConfiguration.items);
        }
        return false;
    }

    @Override
    public final int hashCode() {
        return Objects.hash(items);
    }

    @Override
    public String toString() {
        return MoreObjects.toStringHelper(this)
            .add("items", items)
            .toString();
    }
}
