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/*
 * Copyright 2017-2020 original 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
 *
 * https://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 io.micronaut.configuration.vertx.mysql.client.health;

import io.micronaut.context.annotation.Requires;
import io.micronaut.core.util.StringUtils;
import io.micronaut.health.HealthStatus;
import io.micronaut.management.endpoint.health.HealthEndpoint;
import io.micronaut.management.health.indicator.HealthIndicator;
import io.micronaut.management.health.indicator.HealthResult;
import io.vertx.reactivex.mysqlclient.MySQLPool;
import io.vertx.reactivex.sqlclient.Row;
import jakarta.inject.Singleton;
import org.reactivestreams.Publisher;

import java.util.Collections;

/**
 * A  {@link HealthIndicator} for Vertx MySQL client.
 */
@Requires(beans = HealthEndpoint.class)
@Requires(property = HealthEndpoint.PREFIX + ".vertx.mysql.client.enabled", notEquals = StringUtils.FALSE)
@Singleton
public class MySQLHealthIndicator implements HealthIndicator {
    public static final String NAME = "vertx-mysql-client";
    public static final String QUERY = "SELECT version();";
    private final MySQLPool client;

    /**
     * Constructor.
     *
     * @param client A pool of connections.
     */
    public MySQLHealthIndicator(MySQLPool client) {
        this.client = client;
    }

    @Override
    public Publisher getResult() {
        return client.query(QUERY).rxExecute().map(rows -> {
            HealthResult.Builder status = HealthResult.builder(NAME, HealthStatus.UP);
            Row row = rows.iterator().next();
            status.details(Collections.singletonMap("version", row.getString(0)));
            return status.build();
        }).onErrorReturn(this::buildErrorResult).toFlowable();
    }

    private HealthResult buildErrorResult(Throwable throwable) {
        return HealthResult.builder(NAME, HealthStatus.DOWN).exception(throwable).build();
    }
}