/*
 * Copyright 2013-2021 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 org.springframework.cloud.kubernetes.fabric8.client.istio;

import java.io.InputStream;
import java.util.List;

import io.fabric8.kubernetes.api.model.Service;
import io.fabric8.kubernetes.api.model.apps.Deployment;
import io.fabric8.kubernetes.client.utils.Serialization;
import org.assertj.core.api.Assertions;
import org.junit.jupiter.api.AfterAll;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.Test;
import org.testcontainers.containers.Container;
import org.testcontainers.k3s.K3sContainer;

import org.springframework.cloud.kubernetes.integration.tests.commons.Commons;
import org.springframework.cloud.kubernetes.integration.tests.commons.Images;
import org.springframework.cloud.kubernetes.integration.tests.commons.Phase;
import org.springframework.cloud.kubernetes.integration.tests.commons.fabric8_client.Util;
import org.springframework.http.HttpMethod;
import org.springframework.web.reactive.function.client.WebClient;

import static org.springframework.cloud.kubernetes.integration.tests.commons.Commons.builder;
import static org.springframework.cloud.kubernetes.integration.tests.commons.Commons.retrySpec;

/**
 * @author wind57
 */
class Fabric8IstioIT {

	private static final String NAMESPACE = "istio-test";

	private static final String IMAGE_NAME = "spring-cloud-kubernetes-fabric8-client-istio";

	private static Util util;

	private static K3sContainer K3S;

	@BeforeAll
	static void beforeAll() throws Exception {
		K3S = Commons.container();
		K3S.start();
		util = new Util(K3S);
		Commons.validateImage(IMAGE_NAME, K3S);
		Commons.loadSpringCloudKubernetesImage(IMAGE_NAME, K3S);

		Images.loadIstioCtl(K3S);
		Images.loadIstioProxyV2(K3S);
		Images.loadIstioPilot(K3S);

		processExecResult(K3S.execInContainer("sh", "-c", "kubectl create namespace istio-test"));
		processExecResult(
				K3S.execInContainer("sh", "-c", "kubectl label namespace istio-test istio-injection=enabled"));

		util.setUpIstioctl(NAMESPACE, Phase.CREATE);

		String istioctlPodName = istioctlPodName();
		K3S.execInContainer("sh", "-c",
				"kubectl cp istio-test/" + istioctlPodName + ":/usr/local/bin/istioctl /tmp/istioctl");
		K3S.execInContainer("sh", "-c", "chmod +x /tmp/istioctl");

		processExecResult(K3S.execInContainer("sh", "-c",
				"/tmp/istioctl" + " --kubeconfig=/etc/rancher/k3s/k3s.yaml install --set profile=minimal -y"));

		util.setUpIstio(NAMESPACE);

		appManifests(Phase.CREATE);
	}

	@AfterAll
	static void afterAll() {
		util.deleteNamespace("istio-system");
	}

	@AfterAll
	static void after() {
		appManifests(Phase.DELETE);
		util.setUpIstioctl(NAMESPACE, Phase.DELETE);
	}

	@Test
	void test() {
		WebClient client = builder().baseUrl("http://localhost:32321/profiles").build();

		@SuppressWarnings("unchecked")
		List<String> result = client.method(HttpMethod.GET)
			.retrieve()
			.bodyToMono(List.class)
			.retryWhen(retrySpec())
			.block();

		// istio profile is present
		Assertions.assertThat(result).contains("istio");
	}

	private static void appManifests(Phase phase) {

		InputStream deploymentStream = util.inputStream("istio-deployment.yaml");
		InputStream serviceStream = util.inputStream("istio-service.yaml");

		Deployment deployment = Serialization.unmarshal(deploymentStream, Deployment.class);
		Service service = Serialization.unmarshal(serviceStream, Service.class);

		if (phase.equals(Phase.CREATE)) {
			util.createAndWait(NAMESPACE, null, deployment, service, true);
		}
		else {
			util.deleteAndWait(NAMESPACE, deployment, service);
		}

	}

	private static String istioctlPodName() {
		try {
			return K3S
				.execInContainer("sh", "-c",
						"kubectl get pods -n istio-test -l app=istio-ctl -o=name --no-headers | tr -d '\n'")
				.getStdout()
				.split("/")[1];
		}
		catch (Exception e) {
			throw new RuntimeException(e);
		}
	}

	private static String processExecResult(Container.ExecResult execResult) {
		if (execResult.getExitCode() != 0) {
			throw new RuntimeException("stdout=" + execResult.getStdout() + "\n" + "stderr=" + execResult.getStderr());
		}

		return execResult.getStdout();
	}

}
