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/*
 * SPDX-License-Identifier: Apache-2.0
 * Copyright (c) The original authors
 *
 * Licensed under the Apache Software License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
 */
package io.streamthoughts.jikkou.kafka.change.topics;

import io.streamthoughts.jikkou.common.utils.Pair;
import io.streamthoughts.jikkou.core.data.TypeConverter;
import io.streamthoughts.jikkou.core.models.change.ResourceChange;
import io.streamthoughts.jikkou.core.models.change.StateChange;
import io.streamthoughts.jikkou.core.models.change.StateChangeList;
import io.streamthoughts.jikkou.core.reconciler.TextDescription;
import java.util.stream.Collectors;

public final class TopicChange {

    public static final String PARTITIONS = "partitions";
    public static final String REPLICAS = "replicas";
    public static final String CONFIG_PREFIX = "config.";

    public static TextDescription getDescription(final ResourceChange change) {
        return () -> {

            StateChangeList data = change.getSpec().getChanges();

            String configs = data
                    .allWithPrefix(CONFIG_PREFIX)
                    .stream()
                    .map(it -> Pair.of(it.getName(), it))
                    .map(pair -> pair._1() + "=" + pair._2().getAfter())
                    .collect(Collectors.joining(","));

            return String.format("%s topic '%s' (partitions=%d, replicas=%d, configs=[%s])",
                    change.getSpec().getOp().humanize(),
                    change.getMetadata().getName(),
                    data.getLast(PARTITIONS, TypeConverter.Integer()).getAfter(),
                    data.getLast(REPLICAS, TypeConverter.Short()).getAfter(),
                    configs
            );
        };
    }
}