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/*
 * Copyright 2008-present MongoDB, Inc.
 *
 * 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 com.mongodb.client.internal;

import com.mongodb.ReadConcern;
import com.mongodb.ReadPreference;
import com.mongodb.client.ClientSession;
import com.mongodb.client.ListDatabasesIterable;
import com.mongodb.internal.operation.SyncOperations;
import com.mongodb.lang.Nullable;
import com.mongodb.operation.BatchCursor;
import com.mongodb.operation.ReadOperation;
import org.bson.BsonDocument;
import org.bson.codecs.configuration.CodecRegistry;
import org.bson.conversions.Bson;

import java.util.concurrent.TimeUnit;

import static com.mongodb.assertions.Assertions.notNull;
import static java.util.concurrent.TimeUnit.MILLISECONDS;


/**
 * This class is not part of the public API and may be removed or changed at any time.
 */
class ListDatabasesIterableImpl extends MongoIterableImpl implements ListDatabasesIterable {
    private final SyncOperations operations;
    private final Class resultClass;

    private long maxTimeMS;
    private Bson filter;
    private Boolean nameOnly;

    ListDatabasesIterableImpl(@Nullable final ClientSession clientSession, final Class resultClass,
                              final CodecRegistry codecRegistry, final ReadPreference readPreference,
                              final OperationExecutor executor) {
        this(clientSession, resultClass, codecRegistry, readPreference, executor, true);
    }

    ListDatabasesIterableImpl(@Nullable final ClientSession clientSession, final Class resultClass,
                              final CodecRegistry codecRegistry, final ReadPreference readPreference,
                              final OperationExecutor executor, final boolean retryReads) {
        super(clientSession, executor, ReadConcern.DEFAULT, readPreference, retryReads); // TODO: read concern?
        this.operations = new SyncOperations(BsonDocument.class, readPreference, codecRegistry, retryReads);
        this.resultClass = notNull("clazz", resultClass);
    }

    @Override
    public ListDatabasesIterableImpl maxTime(final long maxTime, final TimeUnit timeUnit) {
        notNull("timeUnit", timeUnit);
        this.maxTimeMS = MILLISECONDS.convert(maxTime, timeUnit);
        return this;
    }

    @Override
    public ListDatabasesIterable batchSize(final int batchSize) {
        super.batchSize(batchSize);
        return this;
    }

    @Override
    public ListDatabasesIterable filter(@Nullable final Bson filter) {
        this.filter = filter;
        return this;
    }

    @Override
    public ListDatabasesIterable nameOnly(@Nullable final Boolean nameOnly) {
        this.nameOnly = nameOnly;
        return this;
    }

    @Override
    public ReadOperation> asReadOperation() {
        return operations.listDatabases(resultClass, filter, nameOnly, maxTimeMS);
    }
}