/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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
 *
 *     http://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.apache.servicecomb.samples;

import org.apache.servicecomb.demo.CategorizedTestCase;
import org.apache.servicecomb.demo.TestMgr;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.stereotype.Component;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestOperations;
import org.springframework.web.client.RestTemplate;


@Component
public class HelloWorldIT implements CategorizedTestCase {
  RestOperations template = new RestTemplate();

  @Override
  public void testRestTransport() throws Exception {
    testHelloWorldFallback();
    testHelloWorldNoHeader();
    testHelloWorld();
    testHelloWorldCanary();
    testHelloWorldEmptyProtectionCloseWeight100();
    testHelloWorldeEmptyProtectionCloseWeightLess100();
    testHelloWorldEmptyProtectionCloseFallback();
    testHelloWorldEmptyProtectionCloseWeight100Two();
  }

  private void testHelloWorld() {
    for (int i = 0; i < 10; i++) {
      MultiValueMap<String, String> headers = new HttpHeaders();
      headers.add("canary", "old");
      HttpEntity<Object> entity = new HttpEntity<>(headers);
      String result = template
          .exchange(Config.GATEWAY_URL + "/sayHello?name=World", HttpMethod.GET, entity, String.class).getBody();
      TestMgr.check("Hello World", result);
    }
  }

  private void testHelloWorldCanary() {
    int oldCount = 0;
    int newCount = 0;

    for (int i = 0; i < 20; i++) {
      MultiValueMap<String, String> headers = new HttpHeaders();
      headers.add("canary", "new");
      HttpEntity<Object> entity = new HttpEntity<>(headers);
      String result = template
          .exchange(Config.GATEWAY_URL + "/sayHelloCanary?name=World", HttpMethod.GET, entity, String.class).getBody();
      if (result.equals("Hello Canary World")) {
        oldCount++;
      } else if (result.equals("Hello Canary in canary World")) {
        newCount++;
      } else {
        TestMgr.fail("not expected result testHelloWorldCanary");
        return;
      }
    }

    double ratio = oldCount / (float) (oldCount + newCount);
    TestMgr.check(ratio > 0.1 && ratio < 0.3, true);
  }

  private void testHelloWorldFallback() {
    int oldCount = 0;
    int newCount = 0;

    for (int i = 0; i < 20; i++) {
      MultiValueMap<String, String> headers = new HttpHeaders();
      headers.add("canary", "fallback");
      HttpEntity<Object> entity = new HttpEntity<>(headers);
      String result = template
          .exchange(Config.GATEWAY_URL + "/sayHelloCanary?name=World", HttpMethod.GET, entity, String.class).getBody();
      if (result.equals("\"Hello Canary World\"")) {
        oldCount++;
      } else if (result.equals("\"Hello Canary in canary World\"")) {
        newCount++;
      } else {
        TestMgr.fail("not expected result testHelloWorldCanary");
        return;
      }
    }

    double ratio = oldCount / (float) (oldCount + newCount);
    TestMgr.check(Math.abs(ratio - 0.2) <= 0.1, true);
  }

  private void testHelloWorldNoHeader() {
    int oldCount = 0;
    int newCount = 0;

    for (int i = 0; i < 20; i++) {
      String result = template
          .getForObject(Config.GATEWAY_URL + "/sayHelloCanary?name=World", String.class);
      if (result.equals("\"Hello Canary World\"")) {
        oldCount++;
      } else if (result.equals("\"Hello Canary in canary World\"")) {
        newCount++;
      } else {
        TestMgr.fail("not expected result testHelloWorldCanary");
        return;
      }
    }

    double ratio = oldCount / (float) (oldCount + newCount);
    TestMgr.check(Double.compare(ratio, 0.5) == 0, true);
  }

  private void testHelloWorldEmptyProtectionCloseWeight100() {
    int failCount = 0;

    for (int i = 0; i < 20; i++) {
      MultiValueMap<String, String> headers = new HttpHeaders();
      headers.add("canary", "emptyProtectionClose100");
      HttpEntity<Object> entity = new HttpEntity<>(headers);
      try {
        template.exchange(Config.GATEWAY_URL + "/sayHelloCanary?name=World", HttpMethod.GET,
            entity, String.class);
      } catch (Exception e) {
        failCount++;
      }
    }

    TestMgr.check(failCount == 20, true);
  }

  private void testHelloWorldeEmptyProtectionCloseWeightLess100() {
    int failCount = 0;
    int succCount = 0;

    for (int i = 0; i < 20; i++) {
      MultiValueMap<String, String> headers = new HttpHeaders();
      headers.add("canary", "emptyProtectionCloseLess100");
      HttpEntity<Object> entity = new HttpEntity<>(headers);
      try {
        template.exchange(Config.GATEWAY_URL + "/sayHelloCanary?name=World", HttpMethod.GET,
            entity, String.class);
        succCount++;
      } catch (Exception e) {
        failCount++;
      }
    }

    TestMgr.check(succCount == 20, true);
  }

  private void testHelloWorldEmptyProtectionCloseFallback() {
    int failCount = 0;
    int succCount = 0;

    for (int i = 0; i < 20; i++) {
      MultiValueMap<String, String> headers = new HttpHeaders();
      headers.add("canary", "emptyProtectionCloseFallback");
      HttpEntity<Object> entity = new HttpEntity<>(headers);
      try {
        template.exchange(Config.GATEWAY_URL + "/sayHelloCanary?name=World", HttpMethod.GET,
            entity, String.class);
        succCount++;
      } catch (Exception e) {
        failCount++;
      }
    }

    TestMgr.check(succCount == 20, true);
  }

  private void testHelloWorldEmptyProtectionCloseWeight100Two() {
    int failCount = 0;
    int succCount = 0;

    for (int i = 0; i < 20; i++) {
      MultiValueMap<String, String> headers = new HttpHeaders();
      headers.add("canary", "emptyProtectionClose100-2");
      HttpEntity<Object> entity = new HttpEntity<>(headers);
      try {
        template.exchange(Config.GATEWAY_URL + "/sayHelloCanary?name=World", HttpMethod.GET,
            entity, String.class);
        succCount++;
      } catch (Exception e) {
        failCount++;
      }
    }

    TestMgr.check(failCount == succCount, true);
  }
}
