////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2017 ArangoDB GmbH, Cologne, Germany
///
/// 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.
///
/// Copyright holder is ArangoDB GmbH, Cologne, Germany
///
/// @author Andrey Abramov
/// @author Vasiliy Nabatchikov
////////////////////////////////////////////////////////////////////////////////

#include "catch.hpp"
#include "common.h"

#include "StorageEngineMock.h"

#if USE_ENTERPRISE
  #include "Enterprise/Ldap/LdapFeature.h"
#endif

#include "V8/v8-globals.h"
#include "VocBase/LogicalCollection.h"
#include "VocBase/LogicalView.h"
#include "VocBase/ManagedDocumentResult.h"
#include "Transaction/StandaloneContext.h"
#include "Utils/OperationOptions.h"
#include "Utils/SingleCollectionTransaction.h"
#include "Aql/AqlFunctionFeature.h"
#include "Aql/OptimizerRulesFeature.h"
#include "GeneralServer/AuthenticationFeature.h"
#include "IResearch/IResearchCommon.h"
#include "IResearch/IResearchFeature.h"
#include "IResearch/IResearchFilterFactory.h"
#include "IResearch/IResearchView.h"
#include "IResearch/IResearchAnalyzerFeature.h"
#include "Logger/Logger.h"
#include "Logger/LogTopic.h"
#include "StorageEngine/EngineSelectorFeature.h"
#include "RestServer/DatabasePathFeature.h"
#include "RestServer/ViewTypesFeature.h"
#include "RestServer/AqlFeature.h"
#include "RestServer/DatabaseFeature.h"
#include "RestServer/QueryRegistryFeature.h"
#include "RestServer/SystemDatabaseFeature.h"
#include "RestServer/TraverserEngineRegistryFeature.h"
#include "Sharding/ShardingFeature.h"
#include "Basics/VelocyPackHelper.h"
#include "Aql/Ast.h"
#include "Aql/Query.h"
#include "3rdParty/iresearch/tests/tests_config.hpp"

#include "IResearch/VelocyPackHelper.h"
#include "analysis/analyzers.hpp"
#include "analysis/token_attributes.hpp"
#include "utils/utf8_path.hpp"

#include <velocypack/Iterator.h>

extern const char* ARGV0; // defined in main.cpp

NS_LOCAL

// -----------------------------------------------------------------------------
// --SECTION--                                                 setup / tear-down
// -----------------------------------------------------------------------------

struct IResearchQueryStartsWithSetup {
  StorageEngineMock engine;
  arangodb::application_features::ApplicationServer server;
  std::unique_ptr<TRI_vocbase_t> system;
  std::vector<std::pair<arangodb::application_features::ApplicationFeature*, bool>> features;

  IResearchQueryStartsWithSetup(): engine(server), server(nullptr, nullptr) {
    arangodb::EngineSelectorFeature::ENGINE = &engine;

    arangodb::tests::init(true);

    // suppress INFO {authentication} Authentication is turned on (system only), authentication for unix sockets is turned on
    arangodb::LogTopic::setLogLevel(arangodb::Logger::AUTHENTICATION.name(), arangodb::LogLevel::WARN);

    // suppress log messages since tests check error conditions
    arangodb::LogTopic::setLogLevel(arangodb::Logger::FIXME.name(), arangodb::LogLevel::ERR); // suppress WARNING DefaultCustomTypeHandler called
    arangodb::LogTopic::setLogLevel(arangodb::iresearch::TOPIC.name(), arangodb::LogLevel::FATAL);
    irs::logger::output_le(iresearch::logger::IRL_FATAL, stderr);

    // setup required application features
    features.emplace_back(new arangodb::ViewTypesFeature(server), true);
    features.emplace_back(new arangodb::AuthenticationFeature(server), true);
    features.emplace_back(new arangodb::DatabasePathFeature(server), false);
    features.emplace_back(new arangodb::DatabaseFeature(server), false);
    features.emplace_back(new arangodb::ShardingFeature(server), true);
    features.emplace_back(new arangodb::QueryRegistryFeature(server), false); // must be first
    arangodb::application_features::ApplicationServer::server->addFeature(features.back().first); // need QueryRegistryFeature feature to be added now in order to create the system database
    system = irs::memory::make_unique<TRI_vocbase_t>(TRI_vocbase_type_e::TRI_VOCBASE_TYPE_NORMAL, 0, TRI_VOC_SYSTEM_DATABASE);
    features.emplace_back(new arangodb::SystemDatabaseFeature(server, system.get()), false); // required for IResearchAnalyzerFeature
    features.emplace_back(new arangodb::TraverserEngineRegistryFeature(server), false); // must be before AqlFeature
    features.emplace_back(new arangodb::AqlFeature(server), true);
    features.emplace_back(new arangodb::aql::OptimizerRulesFeature(server), true);
    features.emplace_back(new arangodb::aql::AqlFunctionFeature(server), true); // required for IResearchAnalyzerFeature
    features.emplace_back(new arangodb::iresearch::IResearchAnalyzerFeature(server), true);
    features.emplace_back(new arangodb::iresearch::IResearchFeature(server), true);

    #if USE_ENTERPRISE
      features.emplace_back(new arangodb::LdapFeature(server), false); // required for AuthenticationFeature with USE_ENTERPRISE
    #endif

    for (auto& f : features) {
      arangodb::application_features::ApplicationServer::server->addFeature(f.first);
    }

    for (auto& f : features) {
      f.first->prepare();
    }

    for (auto& f : features) {
      if (f.second) {
        f.first->start();
      }
    }

    auto* analyzers = arangodb::application_features::ApplicationServer::lookupFeature<
      arangodb::iresearch::IResearchAnalyzerFeature
    >();

    analyzers->emplace("test_analyzer", "TestAnalyzer", "abc"); // cache analyzer
    analyzers->emplace("test_csv_analyzer", "TestDelimAnalyzer", ","); // cache analyzer

    auto* dbPathFeature = arangodb::application_features::ApplicationServer::getFeature<arangodb::DatabasePathFeature>("DatabasePath");
    arangodb::tests::setDatabasePath(*dbPathFeature); // ensure test data is stored in a unique directory
  }

  ~IResearchQueryStartsWithSetup() {
    system.reset(); // destroy before reseting the 'ENGINE'
    arangodb::AqlFeature(server).stop(); // unset singleton instance
    arangodb::LogTopic::setLogLevel(arangodb::iresearch::TOPIC.name(), arangodb::LogLevel::DEFAULT);
    arangodb::LogTopic::setLogLevel(arangodb::Logger::FIXME.name(), arangodb::LogLevel::DEFAULT);
    arangodb::application_features::ApplicationServer::server = nullptr;
    arangodb::EngineSelectorFeature::ENGINE = nullptr;

    // destroy application features
    for (auto& f : features) {
      if (f.second) {
        f.first->stop();
      }
    }

    for (auto& f : features) {
      f.first->unprepare();
    }

    arangodb::LogTopic::setLogLevel(arangodb::Logger::AUTHENTICATION.name(), arangodb::LogLevel::DEFAULT);
  }
}; // IResearchQuerySetup

NS_END

// -----------------------------------------------------------------------------
// --SECTION--                                                        test suite
// -----------------------------------------------------------------------------

////////////////////////////////////////////////////////////////////////////////
/// @brief setup
////////////////////////////////////////////////////////////////////////////////

TEST_CASE("IResearchQueryTestStartsWith", "[iresearch][iresearch-query]") {
  IResearchQueryStartsWithSetup s;
  UNUSED(s);

  static std::vector<std::string> const EMPTY;

  auto createJson = arangodb::velocypack::Parser::fromJson("{ \
    \"name\": \"testView\", \
    \"type\": \"arangosearch\" \
  }");

  TRI_vocbase_t vocbase(TRI_vocbase_type_e::TRI_VOCBASE_TYPE_NORMAL, 1, "testVocbase");
  std::shared_ptr<arangodb::LogicalCollection> logicalCollection1;
  std::shared_ptr<arangodb::LogicalCollection> logicalCollection2;

  // add collection_1
  {
    auto collectionJson = arangodb::velocypack::Parser::fromJson("{ \"name\": \"collection_1\" }");
    logicalCollection1 = vocbase.createCollection(collectionJson->slice());
    REQUIRE((nullptr != logicalCollection1));
  }

  // add collection_2
  {
    auto collectionJson = arangodb::velocypack::Parser::fromJson("{ \"name\": \"collection_2\" }");
    logicalCollection2 = vocbase.createCollection(collectionJson->slice());
    REQUIRE((nullptr != logicalCollection2));
  }

  // add view
  auto view = std::dynamic_pointer_cast<arangodb::iresearch::IResearchView>(
    vocbase.createView(createJson->slice())
  );
  REQUIRE((false == !view));

  // add link to collection
  {
    auto updateJson = arangodb::velocypack::Parser::fromJson(
      "{ \"links\" : {"
        "\"collection_1\" : { \"includeAllFields\" : true },"
        "\"collection_2\" : { \"includeAllFields\" : true }"
      "}}"
    );
    CHECK((view->properties(updateJson->slice(), true).ok()));

    arangodb::velocypack::Builder builder;

    builder.openObject();
    view->properties(builder, true, false);
    builder.close();

    auto slice = builder.slice();
    CHECK(slice.isObject());
    CHECK(slice.get("name").copyString() == "testView");
    CHECK(slice.get("type").copyString() == arangodb::iresearch::DATA_SOURCE_TYPE.name());
    CHECK(slice.get("deleted").isNone()); // no system properties
    auto tmpSlice = slice.get("links");
    CHECK((true == tmpSlice.isObject() && 2 == tmpSlice.length()));
  }

  std::deque<arangodb::ManagedDocumentResult> insertedDocs;

  // populate view with the data
  {
    arangodb::OperationOptions opt;
    TRI_voc_tick_t tick;

    arangodb::transaction::Methods trx(
      arangodb::transaction::StandaloneContext::Create(vocbase),
      EMPTY, EMPTY, EMPTY,
      arangodb::transaction::Options()
    );
    CHECK((trx.begin().ok()));

    // insert into collections
    {
      irs::utf8_path resource;
      resource/=irs::string_ref(IResearch_test_resource_dir);
      resource/=irs::string_ref("simple_sequential.json");

      auto builder = arangodb::basics::VelocyPackHelper::velocyPackFromFile(resource.utf8());
      auto root = builder.slice();
      REQUIRE(root.isArray());

      size_t i = 0;

      std::shared_ptr<arangodb::LogicalCollection> collections[] {
        logicalCollection1, logicalCollection2
      };

      for (auto doc : arangodb::velocypack::ArrayIterator(root)) {
        insertedDocs.emplace_back();
        auto const res = collections[i % 2]->insert(&trx, doc, insertedDocs.back(), opt, tick, false);
        CHECK(res.ok());
        ++i;
      }
    }

    CHECK((trx.commit().ok()));
    CHECK(view->commit().ok());
  }

  // invalid field
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH STARTS_WITH(d.invalid_field, 'abc') RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // invalid type
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH STARTS_WITH(d.seq, '0') RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }

  // exact term, unordered
  {
    std::map<irs::string_ref, arangodb::ManagedDocumentResult const*> expectedDocs {
      { "A", &insertedDocs[0] }
    };

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH starts_with(d.name, 'A') RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      auto const keySlice = resolved.get("name");
      auto const key = arangodb::iresearch::getStringRef(keySlice);

      auto expectedDoc = expectedDocs.find(key);
      REQUIRE(expectedDoc != expectedDocs.end());
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      expectedDocs.erase(expectedDoc);
    }
    CHECK(expectedDocs.empty());
  }

  // d.prefix = abc*, d.seq DESC
  {
    std::map<ptrdiff_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const prefixSlice = docSlice.get("prefix");
      if (prefixSlice.isNone() || !irs::starts_with(arangodb::iresearch::getStringRef(prefixSlice), "abc")) {
        continue;
      }
      expectedDocs.emplace(docSlice.get("seq").getNumber<ptrdiff_t>(), &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH starts_with(d.prefix, 'abc') SORT d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // Empty prefix - return all docs: d.prefix = ''*, TFIDF(), BM25(), d.seq DESC
  {
    std::map<ptrdiff_t, arangodb::ManagedDocumentResult const*> expectedDocs;
    for (auto const& doc : insertedDocs) {
      arangodb::velocypack::Slice docSlice(doc.vpack());
      auto const prefixSlice = docSlice.get("prefix");
      if (prefixSlice.isNone()) {
        continue;
      }
      expectedDocs.emplace(docSlice.get("seq").getNumber<ptrdiff_t>(), &doc);
    }

    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH starts_with(d.prefix, '') SORT TFIDF(d), BM25(d), d.seq DESC RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(expectedDocs.size() == resultIt.size());

    auto expectedDoc = expectedDocs.rbegin();
    for (auto const actualDoc : resultIt) {
      auto const resolved = actualDoc.resolveExternals();
      CHECK(0 == arangodb::basics::VelocyPackHelper::compare(arangodb::velocypack::Slice(expectedDoc->second->vpack()), resolved, true));
      ++expectedDoc;
    }
    CHECK(expectedDoc == expectedDocs.rend());
  }

  // invalid prefix
  {
    auto queryResult = arangodb::tests::executeQuery(
      vocbase,
      "FOR d IN testView SEARCH STARTS_WITH(d.prefix, 'abc_invalid_prefix') RETURN d"
    );
    REQUIRE(TRI_ERROR_NO_ERROR == queryResult.code);

    auto result = queryResult.result->slice();
    CHECK(result.isArray());

    arangodb::velocypack::ArrayIterator resultIt(result);
    CHECK(0 == resultIt.size());
    CHECK(!resultIt.valid());
  }
}

// -----------------------------------------------------------------------------
// --SECTION--                                                       END-OF-FILE
// -----------------------------------------------------------------------------