// Copyright (C) 2015 Ericsson
//
// 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
//
// 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 com.ericsson.gerrit.plugins.highavailability.forwarder.rest;

import static com.google.common.truth.Truth.assertThat;
import static javax.servlet.http.HttpServletResponse.SC_BAD_REQUEST;
import static javax.servlet.http.HttpServletResponse.SC_NO_CONTENT;
import static org.mockito.Mockito.doThrow;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;

import com.ericsson.gerrit.plugins.highavailability.cache.Constants;
import com.ericsson.gerrit.plugins.highavailability.forwarder.rest.CacheRestApiServlet.CacheParameters;
import com.google.common.cache.Cache;
import com.google.gerrit.extensions.registration.DynamicMap;
import java.io.BufferedReader;
import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.mockito.Mock;
import org.mockito.junit.MockitoJUnitRunner;

@RunWith(MockitoJUnitRunner.class)
public class CacheRestApiServletTest {
  @Mock private HttpServletRequest request;
  @Mock private HttpServletResponse response;
  @Mock private BufferedReader reader;
  @Mock private DynamicMap<Cache<?, ?>> cacheMap;
  private CacheRestApiServlet servlet;

  @Before
  public void setUp() {
    servlet = new CacheRestApiServlet(cacheMap);
  }

  @Test
  public void evictAccounts() throws Exception {
    configureMocksFor(Constants.ACCOUNTS);
    verifyResponseIsOK();
  }

  @Test
  public void evictProjectList() throws Exception {
    configureMocksFor(Constants.PROJECT_LIST);
    verifyResponseIsOK();
  }

  @Test
  public void evictGroups() throws Exception {
    configureMocksFor(Constants.GROUPS);
    verifyResponseIsOK();
  }

  @Test
  public void evictGroupsByInclude() throws Exception {
    configureMocksFor(Constants.GROUPS_BYINCLUDE);
    verifyResponseIsOK();
  }

  @Test
  public void evictGroupsMembers() throws Exception {
    configureMocksFor(Constants.GROUPS_MEMBERS);
    verifyResponseIsOK();
  }

  @Test
  public void evictPluginCache() throws Exception {
    configureMocksFor("my-plugin", "my-cache");
    verifyResponseIsOK();
  }

  @Test
  public void evictDefault() throws Exception {
    configureMocksFor(Constants.PROJECTS);
    verifyResponseIsOK();
  }

  @Test
  public void badRequest() throws Exception {
    when(request.getPathInfo()).thenReturn("/someCache");
    String errorMessage = "someError";
    doThrow(new IOException(errorMessage)).when(request).getReader();
    servlet.doPost(request, response);
    verify(response).sendError(SC_BAD_REQUEST, errorMessage);
  }

  @Test
  public void errorWhileSendingErrorMessage() throws Exception {
    when(request.getPathInfo()).thenReturn("/someCache");
    String errorMessage = "someError";
    doThrow(new IOException(errorMessage)).when(request).getReader();
    servlet.doPost(request, response);
    verify(response).sendError(SC_BAD_REQUEST, errorMessage);
  }

  @Test
  public void cacheParameters() throws Exception {
    CacheParameters key = CacheRestApiServlet.getCacheParameters("accounts_by_name");
    assertThat(key.pluginName).isEqualTo(Constants.GERRIT);
    assertThat(key.cacheName).isEqualTo("accounts_by_name");

    key = CacheRestApiServlet.getCacheParameters("my_plugin.my_cache");
    assertThat(key.pluginName).isEqualTo("my_plugin");
    assertThat(key.cacheName).isEqualTo("my_cache");
  }

  private void verifyResponseIsOK() throws Exception {
    servlet.doPost(request, response);
    verify(response).setStatus(SC_NO_CONTENT);
  }

  private void configureMocksFor(String cacheName) throws Exception {
    configureMocksFor(Constants.GERRIT, cacheName);
  }

  @SuppressWarnings("unchecked")
  private void configureMocksFor(String pluginName, String cacheName) throws Exception {
    when(cacheMap.get(pluginName, cacheName)).thenReturn(mock(Cache.class));
    if (Constants.GERRIT.equals(pluginName)) {
      when(request.getPathInfo()).thenReturn("/" + cacheName);
    } else {
      when(request.getPathInfo()).thenReturn("/" + pluginName + "." + cacheName);
    }
    when(request.getReader()).thenReturn(reader);

    if (Constants.PROJECTS.equals(cacheName)) {
      when(reader.readLine()).thenReturn("abc");
    } else if (Constants.GROUPS_BYINCLUDE.equals(cacheName)
        || Constants.GROUPS_MEMBERS.equals(cacheName)) {
      when(reader.readLine()).thenReturn("{\"uuid\":\"abcd1234\"}");
    } else {
      when(reader.readLine()).thenReturn("{}");
    }
  }
}