/**
 * Copyright © 2016-2022 The Thingsboard Authors
 *
 * 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 org.thingsboard.server.common.msg.tools;

import io.github.bucket4j.Bandwidth;
import io.github.bucket4j.Bucket4j;
import io.github.bucket4j.Refill;
import io.github.bucket4j.local.LocalBucket;
import io.github.bucket4j.local.LocalBucketBuilder;

import java.time.Duration;

/**
 * Created by ashvayka on 22.10.18.
 */
public class TbRateLimits {
    private final LocalBucket bucket;
    private final String config;

    public TbRateLimits(String limitsConfiguration) {
        this(limitsConfiguration, false);
    }

    public TbRateLimits(String limitsConfiguration, boolean refillIntervally) {
        LocalBucketBuilder builder = Bucket4j.builder();
        boolean initialized = false;
        for (String limitSrc : limitsConfiguration.split(",")) {
            long capacity = Long.parseLong(limitSrc.split(":")[0]);
            long duration = Long.parseLong(limitSrc.split(":")[1]);
            Refill refill = refillIntervally ? Refill.intervally(capacity, Duration.ofSeconds(duration)) : Refill.greedy(capacity, Duration.ofSeconds(duration));
            builder.addLimit(Bandwidth.classic(capacity, refill));
            initialized = true;
        }
        if (initialized) {
            bucket = builder.build();
        } else {
            throw new IllegalArgumentException("Failed to parse rate limits configuration: " + limitsConfiguration);
        }
        this.config = limitsConfiguration;
    }

    public boolean tryConsume() {
        return bucket.tryConsume(1);
    }

    public boolean tryConsume(long number) {
        return bucket.tryConsume(number);
    }

    public String getConfig() {
        return config;
    }

}
