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The MongoDB Asynchronous Driver
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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.async.client.internal;

import com.mongodb.MongoClientException;
import com.mongodb.MongoTimeoutException;
import com.mongodb.ReadConcern;
import com.mongodb.ReadPreference;
import com.mongodb.async.SingleResultCallback;
import com.mongodb.async.client.MongoClient;
import com.mongodb.async.client.MongoClients;
import org.bson.RawBsonDocument;

import java.io.Closeable;
import java.util.Map;

import static com.mongodb.assertions.Assertions.notNull;
import static com.mongodb.internal.capi.MongoCryptHelper.createMongocryptdClientSettings;
import static com.mongodb.internal.capi.MongoCryptHelper.createProcessBuilder;
import static com.mongodb.internal.capi.MongoCryptHelper.startProcess;

@SuppressWarnings("UseOfProcessBuilder")
class CommandMarker implements Closeable {
    private final MongoClient client;
    private final ProcessBuilder processBuilder;

    CommandMarker(final boolean isBypassAutoEncryption, final Map options) {
        if (isBypassAutoEncryption) {
            processBuilder = null;
            client = null;
            return;
        }

        if (!options.containsKey("mongocryptdBypassSpawn") || !((Boolean) options.get("mongocryptdBypassSpawn"))) {
            processBuilder = createProcessBuilder(options);
            startProcess(processBuilder);
        } else {
            processBuilder = null;
        }
        client = MongoClients.create(createMongocryptdClientSettings((String) options.get("mongocryptdURI")));
    }

    void mark(final String databaseName, final RawBsonDocument command, final SingleResultCallback callback) {
        notNull("client", client, callback);

        final SingleResultCallback wrappedCallback = new SingleResultCallback() {
            @Override
            public void onResult(final RawBsonDocument result, final Throwable t) {
                if (t != null) {
                    callback.onResult(null, new MongoClientException("Exception in encryption library: " + t.getMessage(), t));
                } else {
                    callback.onResult(result, null);
                }
            }
        };
        runCommand(databaseName, command, new SingleResultCallback() {
            @Override
            public void onResult(final RawBsonDocument result, final Throwable t) {
                if (t == null) {
                    wrappedCallback.onResult(result, null);
                } else if (t instanceof MongoTimeoutException && processBuilder != null) {
                    startProcessAndContinue(new SingleResultCallback() {
                        @Override
                        public void onResult(final Void result, final Throwable t) {
                            if (t != null) {
                                callback.onResult(null, t);
                            } else {
                                runCommand(databaseName, command, wrappedCallback);
                            }
                        }
                    });
                } else {
                    wrappedCallback.onResult(null, t);
                }
            }
        });
    }

    @Override
    public void close() {
        if (client != null) {
            client.close();
        }
    }

    private void runCommand(final String databaseName, final RawBsonDocument command,
                            final SingleResultCallback callback) {
        client.getDatabase(databaseName)
                .withReadConcern(ReadConcern.DEFAULT)
                .withReadPreference(ReadPreference.primary())
                .runCommand(command, RawBsonDocument.class, callback);
    }

    private void startProcessAndContinue(final SingleResultCallback callback) {
        try {
            startProcess(processBuilder);
            callback.onResult(null, null);
        } catch (Throwable t) {
            callback.onResult(null, t);
        }
    }
}