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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.management.endpoint.loggers.impl;

import io.micronaut.context.annotation.Requires;
import io.micronaut.management.endpoint.loggers.LoggerConfiguration;
import io.micronaut.management.endpoint.loggers.LoggersEndpoint;
import io.micronaut.management.endpoint.loggers.LoggersManager;
import io.micronaut.management.endpoint.loggers.ManagedLoggingSystem;
import jakarta.inject.Singleton;
import jakarta.validation.constraints.NotBlank;
import jakarta.validation.constraints.NotNull;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Flux;

import java.util.Arrays;
import java.util.Collection;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * Default implementation of {@link LoggersManager}.
 *
 * @author Matthew Moss
 * @since 1.0
 */
@Singleton
@Requires(beans = LoggersEndpoint.class)
public class DefaultLoggersManager implements LoggersManager> {

    private static final String LEVELS = "levels";
    private static final String LOGGERS = "loggers";

    @Override
    public Publisher> getLoggers(ManagedLoggingSystem loggingSystem) {
        Map data = new LinkedHashMap<>(2);

        data.put(LEVELS, getLogLevels());
        data.put(LOGGERS, getLoggerData(loggingSystem.getLoggers()));
        return Flux.just(data);
    }

    @Override
    public Publisher> getLogger(ManagedLoggingSystem loggingSystem,
                                                    String name) {
        return Flux.just(getLoggerData(loggingSystem.getLogger(name)));
    }

    @Override
    public void setLogLevel(ManagedLoggingSystem loggingSystem, @NotBlank String name, @NotNull io.micronaut.logging.LogLevel level) {
        loggingSystem.setLogLevel(name, level);
    }

    /**
     * @param configurations The logger configurations
     * @return A Map from logger name to logger configuration data
     */
    private static Map getLoggerData(
        Collection configurations) {
        return configurations
            .stream()
            .collect(Collectors.toMap(
                LoggerConfiguration::getName,
                LoggerConfiguration::getData,
                (l1, l2) -> l1,
                LinkedHashMap::new));
    }

    /**
     * @param configuration The logger configuration
     * @return The logger configuration data
     */
    private static Map getLoggerData(
        LoggerConfiguration configuration) {
        return configuration.getData();
    }

    /**
     * @return A list with all {@link io.micronaut.logging.LogLevel} values
     */
    private static List getLogLevels() {
        return Arrays.asList(io.micronaut.logging.LogLevel.values());
    }

}