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/*-
 * ========================LICENSE_START=================================
 * Bucket4j
 * %%
 * Copyright (C) 2015 - 2020 Vladimir Bukhtoyarov
 * %%
 * 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 io.github.bucket4j.distributed.remote.commands;

import io.github.bucket4j.distributed.remote.CommandResult;
import io.github.bucket4j.distributed.remote.MutableBucketEntry;
import io.github.bucket4j.distributed.remote.RemoteBucketState;
import io.github.bucket4j.distributed.remote.RemoteCommand;
import io.github.bucket4j.distributed.serialization.DeserializationAdapter;
import io.github.bucket4j.distributed.serialization.Scope;
import io.github.bucket4j.distributed.serialization.SerializationAdapter;
import io.github.bucket4j.distributed.serialization.SerializationHandle;
import io.github.bucket4j.distributed.versioning.Version;
import io.github.bucket4j.distributed.versioning.Versions;
import io.github.bucket4j.util.ComparableByContent;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

import static io.github.bucket4j.distributed.serialization.PrimitiveSerializationHandles.LONG_HANDLE;
import static io.github.bucket4j.distributed.versioning.Versions.v_7_0_0;


public class ReserveAndCalculateTimeToSleepCommand implements RemoteCommand, ComparableByContent {

    private final long tokensToConsume;
    private final long waitIfBusyNanosLimit;

    public static final SerializationHandle SERIALIZATION_HANDLE = new SerializationHandle<>() {
        @Override
        public  ReserveAndCalculateTimeToSleepCommand deserialize(DeserializationAdapter adapter, S input) throws IOException {
            int formatNumber = adapter.readInt(input);
            Versions.check(formatNumber, v_7_0_0, v_7_0_0);

            long tokensToConsume = adapter.readLong(input);
            long waitIfBusyNanosLimit = adapter.readLong(input);

            return new ReserveAndCalculateTimeToSleepCommand(tokensToConsume, waitIfBusyNanosLimit);
        }

        @Override
        public  void serialize(SerializationAdapter adapter, O output, ReserveAndCalculateTimeToSleepCommand command, Version backwardCompatibilityVersion, Scope scope) throws IOException {
            adapter.writeInt(output, v_7_0_0.getNumber());

            adapter.writeLong(output, command.tokensToConsume);
            adapter.writeLong(output, command.waitIfBusyNanosLimit);
        }

        @Override
        public int getTypeId() {
            return 23;
        }

        @Override
        public Class getSerializedType() {
            return ReserveAndCalculateTimeToSleepCommand.class;
        }

        @Override
        public ReserveAndCalculateTimeToSleepCommand fromJsonCompatibleSnapshot(Map snapshot) {
            int formatNumber = readIntValue(snapshot, "version");
            Versions.check(formatNumber, v_7_0_0, v_7_0_0);

            long tokensToConsume = readLongValue(snapshot, "tokensToConsume");
            long waitIfBusyNanosLimit = readLongValue(snapshot, "waitIfBusyNanosLimit");
            return new ReserveAndCalculateTimeToSleepCommand(tokensToConsume, waitIfBusyNanosLimit);
        }

        @Override
        public Map toJsonCompatibleSnapshot(ReserveAndCalculateTimeToSleepCommand command, Version backwardCompatibilityVersion, Scope scope) {
            Map result = new HashMap<>();
            result.put("version", v_7_0_0.getNumber());
            result.put("tokensToConsume", command.tokensToConsume);
            result.put("waitIfBusyNanosLimit", command.waitIfBusyNanosLimit);
            return result;
        }

        @Override
        public String getTypeName() {
            return "ReserveAndCalculateTimeToSleepCommand";
        }

    };

    public ReserveAndCalculateTimeToSleepCommand(long tokensToConsume, long waitIfBusyNanosLimit) {
        this.tokensToConsume = tokensToConsume;
        this.waitIfBusyNanosLimit = waitIfBusyNanosLimit;
    }

    @Override
    public CommandResult execute(MutableBucketEntry mutableEntry, long currentTimeNanos) {
        if (!mutableEntry.exists()) {
            return CommandResult.bucketNotFound();
        }

        RemoteBucketState state = mutableEntry.get();
        state.refillAllBandwidth(currentTimeNanos);

        long nanosToCloseDeficit = state.calculateDelayNanosAfterWillBePossibleToConsume(tokensToConsume, currentTimeNanos, false);
        if (nanosToCloseDeficit == Long.MAX_VALUE || nanosToCloseDeficit > waitIfBusyNanosLimit) {
            return CommandResult.MAX_VALUE;
        } else {
            state.consume(tokensToConsume);
            mutableEntry.set(state);
            return CommandResult.success(nanosToCloseDeficit, LONG_HANDLE);
        }
    }

    public long getTokensToConsume() {
        return tokensToConsume;
    }

    public long getWaitIfBusyNanosLimit() {
        return waitIfBusyNanosLimit;
    }

    @Override
    public SerializationHandle getSerializationHandle() {
        return SERIALIZATION_HANDLE;
    }

    @Override
    public boolean equalsByContent(ReserveAndCalculateTimeToSleepCommand other) {
        return tokensToConsume == other.tokensToConsume &&
                waitIfBusyNanosLimit == other.waitIfBusyNanosLimit;
    }

    @Override
    public boolean isImmediateSyncRequired(long unsynchronizedTokens, long nanosSinceLastSync) {
        return false;
    }

    @Override
    public long estimateTokensToConsume() {
        return tokensToConsume;
    }

    @Override
    public long getConsumedTokens(Long result) {
        return result;
    }

    @Override
    public Version getRequiredVersion() {
        return v_7_0_0;
    }

}