/*
 * 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.solr.handler.admin;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import com.fasterxml.jackson.annotation.JsonProperty;
import org.apache.solr.SolrTestCaseJ4;
import org.apache.solr.api.AnnotatedApi;
import org.apache.solr.api.Api;
import org.apache.solr.api.ApiBag;
import org.apache.solr.api.Command;
import org.apache.solr.api.EndPoint;
import org.apache.solr.api.V2HttpCall;
import org.apache.solr.api.V2HttpCall.CompositeApi;
import org.apache.solr.client.solrj.SolrRequest;
import org.apache.solr.common.params.MapSolrParams;
import org.apache.solr.common.params.ModifiableSolrParams;
import org.apache.solr.common.params.SolrParams;
import org.apache.solr.common.util.CommandOperation;
import org.apache.solr.common.util.ContentStream;
import org.apache.solr.common.util.ContentStreamBase;
import org.apache.solr.common.util.JsonSchemaValidator;
import org.apache.solr.common.util.PathTrie;
import org.apache.solr.common.util.StrUtils;
import org.apache.solr.common.util.Utils;
import org.apache.solr.common.util.ValidatingJsonMap;
import org.apache.solr.core.CoreContainer;
import org.apache.solr.core.PluginBag;
import org.apache.solr.handler.PingRequestHandler;
import org.apache.solr.handler.SchemaHandler;
import org.apache.solr.handler.SolrConfigHandler;
import org.apache.solr.request.LocalSolrQueryRequest;
import org.apache.solr.request.SolrQueryRequest;
import org.apache.solr.request.SolrQueryRequestBase;
import org.apache.solr.request.SolrRequestHandler;
import org.apache.solr.response.SolrQueryResponse;
import org.apache.solr.security.PermissionNameProvider;

import static java.nio.charset.StandardCharsets.UTF_8;
import static org.apache.solr.api.ApiBag.EMPTY_SPEC;
import static org.apache.solr.client.solrj.SolrRequest.METHOD.GET;
import static org.apache.solr.client.solrj.SolrRequest.METHOD.POST;
import static org.apache.solr.common.params.CommonParams.COLLECTIONS_HANDLER_PATH;
import static org.apache.solr.common.params.CommonParams.CONFIGSETS_HANDLER_PATH;
import static org.apache.solr.common.params.CommonParams.CORES_HANDLER_PATH;
import static org.apache.solr.common.util.ValidatingJsonMap.NOT_NULL;

public class TestApiFramework extends SolrTestCaseJ4 {

  public void testFramework() {
    Map<String, Object[]> calls = new HashMap<>();
    Map<String, Object> out = new HashMap<>();
    CoreContainer mockCC = TestCoreAdminApis.getCoreContainerMock(calls, out);
    PluginBag<SolrRequestHandler> containerHandlers = new PluginBag<>(SolrRequestHandler.class, null, false);
    containerHandlers.put(COLLECTIONS_HANDLER_PATH, new TestCollectionAPIs.MockCollectionsHandler());
    containerHandlers.put(CORES_HANDLER_PATH, new CoreAdminHandler(mockCC));
    containerHandlers.put(CONFIGSETS_HANDLER_PATH, new ConfigSetsHandler(mockCC));
    out.put("getRequestHandlers", containerHandlers);

    PluginBag<SolrRequestHandler> coreHandlers = new PluginBag<>(SolrRequestHandler.class, null, false);
    coreHandlers.put("/schema", new SchemaHandler());
    coreHandlers.put("/config", new SolrConfigHandler());
    coreHandlers.put("/admin/ping", new PingRequestHandler());

    Map<String, String> parts = new HashMap<>();
    String fullPath = "/collections/hello/shards";
    Api api = V2HttpCall.getApiInfo(containerHandlers, fullPath, "POST",
        fullPath, parts);
    assertNotNull(api);
    assertConditions(api.getSpec(), Utils.makeMap(
        "/methods[0]", "POST",
        "/commands/create", NOT_NULL));
    assertEquals("hello", parts.get("collection"));


    parts = new HashMap<>();
    api = V2HttpCall.getApiInfo(containerHandlers, "/collections/hello/shards", "POST",
        null, parts);
    assertConditions(api.getSpec(), Utils.makeMap(
        "/methods[0]", "POST",
        "/commands/split", NOT_NULL,
        "/commands/add-replica", NOT_NULL
    ));


    parts = new HashMap<>();
    api = V2HttpCall.getApiInfo(containerHandlers, "/collections/hello/shards/shard1", "POST",
        null, parts);
    assertConditions(api.getSpec(), Utils.makeMap(
        "/methods[0]", "POST",
        "/commands/force-leader", NOT_NULL
    ));
    assertEquals("hello", parts.get("collection"));
    assertEquals("shard1", parts.get("shard"));


    parts = new HashMap<>();
    api = V2HttpCall.getApiInfo(containerHandlers, "/collections/hello", "POST",
        null, parts);
    assertConditions(api.getSpec(), Utils.makeMap(
        "/methods[0]", "POST",
        "/commands/add-replica-property", NOT_NULL,
        "/commands/delete-replica-property", NOT_NULL
    ));
    assertEquals("hello", parts.get("collection"));

    api = V2HttpCall.getApiInfo(containerHandlers, "/collections/hello/shards/shard1/replica1", "DELETE",
        null, parts);
    assertConditions(api.getSpec(), Utils.makeMap(
        "/methods[0]", "DELETE",
        "/url/params/onlyIfDown/type", "boolean"
    ));
    assertEquals("hello", parts.get("collection"));
    assertEquals("shard1", parts.get("shard"));
    assertEquals("replica1", parts.get("replica"));

    SolrQueryResponse rsp = invoke(containerHandlers, null, "/collections/_introspect", GET, mockCC);

    Set<String> methodNames = new HashSet<>();
    methodNames.add(rsp.getValues()._getStr("/spec[0]/methods[0]", null));
    methodNames.add(rsp.getValues()._getStr("/spec[1]/methods[0]", null));
    methodNames.add(rsp.getValues()._getStr("/spec[2]/methods[0]", null));
    assertTrue(methodNames.contains("DELETE"));
    assertTrue(methodNames.contains("POST"));
    assertTrue(methodNames.contains("GET"));

    methodNames = new HashSet<>();

    rsp = invoke(coreHandlers, "/schema/_introspect", "/collections/hello/schema/_introspect", GET, mockCC);
    methodNames.add(rsp.getValues()._getStr("/spec[0]/methods[0]", null));
    methodNames.add(rsp.getValues()._getStr("/spec[1]/methods[0]", null));
    assertTrue(methodNames.contains("POST"));
    assertTrue(methodNames.contains("GET"));

    rsp = invoke(coreHandlers, "/", "/collections/hello/_introspect", GET, mockCC);
    assertConditions(rsp.getValues().asMap(2), Utils.makeMap(
        "/availableSubPaths", NOT_NULL,
        "availableSubPaths /collections/hello/config/jmx", NOT_NULL,
        "availableSubPaths /collections/hello/schema", NOT_NULL,
        "availableSubPaths /collections/hello/shards", NOT_NULL,
        "availableSubPaths /collections/hello/shards/{shard}", NOT_NULL,
        "availableSubPaths /collections/hello/shards/{shard}/{replica}", NOT_NULL
    ));

  }

  public void testPayload() throws IOException {
    String json = "{package:pkg1, version: '0.1', files  :[a.jar, b.jar]}";
    Utils.fromJSONString(json);

    ApiBag apiBag = new ApiBag(false);
    AnnotatedApi api = new AnnotatedApi(new ApiTest());
    apiBag.register(api, Collections.emptyMap());

    ValidatingJsonMap spec = api.getSpec();

    assertEquals("POST", spec._getStr("/methods[0]",null) );
    assertEquals("POST", spec._getStr("/methods[0]",null) );
    assertEquals("/cluster/package", spec._getStr("/url/paths[0]",null) );
    assertEquals("string", spec._getStr("/commands/add/properties/package/type",null) );
    assertEquals("array", spec._getStr("/commands/add/properties/files/type",null) );
    assertEquals("string", spec._getStr("/commands/add/properties/files/items/type",null) );
    assertEquals("string", spec._getStr("/commands/delete/items/type",null) );
    SolrQueryResponse rsp = v2ApiInvoke(apiBag, "/cluster/package", "POST", new ModifiableSolrParams(),
        new ByteArrayInputStream("{add:{package:mypkg, version: '1.0', files : [a.jar, b.jar]}}".getBytes(UTF_8)));


    AddVersion addversion = (AddVersion) rsp.getValues().get("add");
    assertEquals("mypkg", addversion.pkg);
    assertEquals("1.0", addversion.version);
    assertEquals("a.jar", addversion.files.get(0));
    assertEquals("b.jar", addversion.files.get(1));


  }

  @EndPoint(method = POST, path = "/cluster/package", permission = PermissionNameProvider.Name.ALL)
  public static class ApiTest {
    @Command(name = "add")
    public void add(SolrQueryRequest req, SolrQueryResponse rsp, AddVersion addVersion) {
      rsp.add("add", addVersion);

    }

    @Command(name = "delete")
    public void del(SolrQueryRequest req, SolrQueryResponse rsp, List<String> names) {
      rsp.add("delete",names);

    }


  }

  public static class AddVersion {
    @JsonProperty(value = "package", required = true)
    public String pkg;
    @JsonProperty(value = "version", required = true)
    public String version;
    @JsonProperty(value = "files", required = true)
    public List<String> files;
  }

  public void testAnnotatedApi() {
    ApiBag apiBag = new ApiBag(false);
    apiBag.register(new AnnotatedApi(new DummyTest()), Collections.emptyMap());
    SolrQueryResponse rsp = v2ApiInvoke(apiBag, "/node/filestore/package/mypkg/jar1.jar", "GET",
        new ModifiableSolrParams(), null);
    assertEquals("/package/mypkg/jar1.jar", rsp.getValues().get("path"));
  }

  @EndPoint(
      path = "/node/filestore/*",
      method = SolrRequest.METHOD.GET,
      permission = PermissionNameProvider.Name.ALL)
  public class DummyTest {
    @Command
    public void read(SolrQueryRequest req, SolrQueryResponse rsp) {
      rsp.add("FSRead.called", "true");
      rsp.add("path", req.getPathTemplateValues().get("*"));
    }
  }

  private static SolrQueryResponse v2ApiInvoke(ApiBag bag, String uri, String method, SolrParams params, InputStream payload) {
    if (params == null) params = new ModifiableSolrParams();
    SolrQueryResponse rsp = new SolrQueryResponse();
    HashMap<String, String> templateVals = new HashMap<>();
    Api[] currentApi = new Api[1];

    SolrQueryRequestBase req = new SolrQueryRequestBase(null, params) {

      @Override
      public Map<String, String> getPathTemplateValues() {
        return templateVals;
      }

      @Override
      protected Map<String, JsonSchemaValidator> getValidators() {
        return currentApi[0] == null?
            Collections.emptyMap():
            currentApi[0].getCommandSchema();
      }

      @Override
      public Iterable<ContentStream> getContentStreams() {
        return Collections.singletonList(new ContentStreamBase() {
          @Override
          public InputStream getStream() throws IOException {
            return payload;
          }
        });

      }
    };
    Api api = bag.lookup(uri, method, templateVals);
    currentApi[0] = api;


    api.call(req, rsp);
    return rsp;

  }

  public void testTrailingTemplatePaths() {
    PathTrie<Api> registry = new PathTrie<>();
    Api api = new Api(EMPTY_SPEC) {
      @Override
      public void call(SolrQueryRequest req, SolrQueryResponse rsp) {

      }
    };
    Api intropsect = new ApiBag.IntrospectApi(api, false);
    ApiBag.registerIntrospect(Collections.emptyMap(), registry, "/c/.system/blob/{name}", intropsect);
    ApiBag.registerIntrospect(Collections.emptyMap(), registry, "/c/.system/{x}/{name}", intropsect);
    assertEquals(intropsect, registry.lookup("/c/.system/blob/random_string/_introspect", new HashMap<>()));
    assertEquals(intropsect, registry.lookup("/c/.system/blob/_introspect", new HashMap<>()));
    assertEquals(intropsect, registry.lookup("/c/.system/_introspect", new HashMap<>()));
    assertEquals(intropsect, registry.lookup("/c/.system/v1/_introspect", new HashMap<>()));
    assertEquals(intropsect, registry.lookup("/c/.system/v1/v2/_introspect", new HashMap<>()));
  }

  private SolrQueryResponse invoke(PluginBag<SolrRequestHandler> reqHandlers, String path,
                                   String fullPath, SolrRequest.METHOD method,
                                   CoreContainer mockCC) {
    HashMap<String, String> parts = new HashMap<>();
    boolean containerHandlerLookup = mockCC.getRequestHandlers() == reqHandlers;
    path = path == null ? fullPath : path;
    Api api = null;
    if (containerHandlerLookup) {
      api = V2HttpCall.getApiInfo(reqHandlers, path, "GET", fullPath, parts);
    } else {
      api = V2HttpCall.getApiInfo(mockCC.getRequestHandlers(), fullPath, "GET", fullPath, parts);
      if (api == null) api = new CompositeApi(null);
      if (api instanceof CompositeApi) {
        CompositeApi compositeApi = (CompositeApi) api;
        api = V2HttpCall.getApiInfo(reqHandlers, path, "GET", fullPath, parts);
        compositeApi.add(api);
        api = compositeApi;
      }
    }

    SolrQueryResponse rsp = new SolrQueryResponse();
    LocalSolrQueryRequest req = new LocalSolrQueryRequest(null, new MapSolrParams(new HashMap<>())) {
      @Override
      public List<CommandOperation> getCommands(boolean validateInput) {
        return Collections.emptyList();
      }
    };

    api.call(req, rsp);
    return rsp;

  }


  public static void assertConditions(Map root, Map conditions) {
    for (Object o : conditions.entrySet()) {
      Map.Entry e = (Map.Entry) o;
      String path = (String) e.getKey();
      List<String> parts = StrUtils.splitSmart(path, path.charAt(0) == '/' ? '/' : ' ', true);
      Object val = Utils.getObjectByPath(root, false, parts);
      if (e.getValue() instanceof ValidatingJsonMap.PredicateWithErrMsg) {
        ValidatingJsonMap.PredicateWithErrMsg value = (ValidatingJsonMap.PredicateWithErrMsg) e.getValue();
        String err = value.test(val);
        if (err != null) {
          assertEquals(err + " for " + e.getKey() + " in :" + Utils.toJSONString(root), e.getValue(), val);
        }

      } else {
        assertEquals("incorrect value for path " + e.getKey() + " in :" + Utils.toJSONString(root), e.getValue(), val);
      }
    }
  }
}