/*
 * Copyright 2012-2019 the original author or 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 com.example;

import java.time.Duration;
import java.util.Locale;
import java.util.function.Function;
import java.util.function.Supplier;

import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.messaging.Message;

// @checkstyle:off
@SpringBootApplication
public class SampleApplication {

	public static void main(String[] args) throws Exception {
		SpringApplication.run(SampleApplication.class, "--management.endpoints.web.exposure.include=functions");
	}

	@Bean
	public Function<String, String> uppercase() {
		return value -> value.toUpperCase(Locale.ROOT);
	}

	@Bean
	public Function<Message<String>, Integer> uppercaseMessage() {
		return value -> value.getPayload().toUpperCase(Locale.ROOT).length();
	}

	@Bean
	public Function<Flux<String>, Flux<String>> lowercase() {
		return flux -> flux.map(value -> value.toLowerCase(Locale.ROOT));
	}

	@Bean
	public Supplier<String> hello() {
		return () -> "hello";
	}

	@Bean
	public Supplier<Flux<String>> infinite() {
	    return () -> Flux
	            .interval(Duration.ofSeconds(1))
	            .log()
	            .map(counter -> String.format("Counter: %s", counter));
	}

}