////////////////////////////////////////////////////////////////////////////////
/// DISCLAIMER
///
/// Copyright 2019 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 "../Mocks/StorageEngineMock.h"
#include "ApplicationFeatures/ApplicationServer.h"
#include "Aql/QueryRegistry.h"

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

#include "GeneralServer/AuthenticationFeature.h"
#include "RestServer/QueryRegistryFeature.h"
#include "RestServer/ViewTypesFeature.h"
#include "StorageEngine/EngineSelectorFeature.h"
#include "Utils/ExecContext.h"
#include "velocypack/Parser.h"
#include "VocBase/LogicalView.h"
#include "VocBase/vocbase.h"

namespace {

struct TestView: public arangodb::LogicalView {
  arangodb::Result _appendVelocyPackResult;
  arangodb::velocypack::Builder _properties;

  TestView(TRI_vocbase_t& vocbase, arangodb::velocypack::Slice const& definition, uint64_t planVersion)
    : arangodb::LogicalView(vocbase, definition, planVersion) {
  }
  virtual arangodb::Result appendVelocyPackImpl(arangodb::velocypack::Builder& builder, bool, bool) const override { 
    builder.add("properties", _properties.slice());
    return _appendVelocyPackResult;
  }
  virtual arangodb::Result dropImpl() override { return arangodb::LogicalViewHelperStorageEngine::drop(*this); }
  virtual void open() override {}
  virtual arangodb::Result renameImpl(std::string const& oldName) override { return arangodb::LogicalViewHelperStorageEngine::rename(*this, oldName); }
  virtual arangodb::Result properties(arangodb::velocypack::Slice const& properties, bool partialUpdate) override { _properties = arangodb::velocypack::Builder(properties); return arangodb::Result(); }
  virtual bool visitCollections(CollectionVisitor const& visitor) const override { return true; }
};

struct ViewFactory: public arangodb::ViewFactory {
  virtual arangodb::Result create(
      arangodb::LogicalView::ptr& view,
      TRI_vocbase_t& vocbase,
      arangodb::velocypack::Slice const& definition
  ) const override {
    view = vocbase.createView(definition);

    return arangodb::Result();
  }

  virtual arangodb::Result instantiate(
      arangodb::LogicalView::ptr& view,
      TRI_vocbase_t& vocbase,
      arangodb::velocypack::Slice const& definition,
      uint64_t planVersion
  ) const override {
    view = std::make_shared<TestView>(vocbase, definition, planVersion);

    return arangodb::Result();
  }
};

}

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

struct LogicalViewSetup {
  StorageEngineMock engine;
  arangodb::application_features::ApplicationServer server;
  std::vector<std::pair<arangodb::application_features::ApplicationFeature*, bool>> features;
  ViewFactory viewFactory;

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

    // 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);

    features.emplace_back(new arangodb::AuthenticationFeature(server), false); // required for ExecContext
    features.emplace_back(new arangodb::QueryRegistryFeature(server), false); // required for TRI_vocbase_t
    features.emplace_back(new arangodb::ViewTypesFeature(server), false); // required for LogicalView::create(...)

    #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* viewTypesFeature =
      arangodb::application_features::ApplicationServer::lookupFeature<arangodb::ViewTypesFeature>();

    viewTypesFeature->emplace(
      arangodb::LogicalDataSource::Type::emplace(arangodb::velocypack::StringRef("testViewType")),
      viewFactory
    );
  }

  ~LogicalViewSetup() {
    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);
  }
};

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

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

TEST_CASE("LogicalViewTest", "[vocbase]") {
  LogicalViewSetup s;
  (void)(s);

SECTION("test_auth") {
  auto viewJson = arangodb::velocypack::Parser::fromJson("{ \"name\": \"testView\", \"type\": \"testViewType\" }");

  // no ExecContext
  {
    TRI_vocbase_t vocbase(TRI_vocbase_type_e::TRI_VOCBASE_TYPE_NORMAL, 1, "testVocbase");
    auto logicalView = vocbase.createView(viewJson->slice());
    CHECK((true == logicalView->canUse(arangodb::auth::Level::RW)));
  }

  // no read access
  {
    TRI_vocbase_t vocbase(TRI_vocbase_type_e::TRI_VOCBASE_TYPE_NORMAL, 1, "testVocbase");
    auto logicalView = vocbase.createView(viewJson->slice());
    struct ExecContext: public arangodb::ExecContext {
      ExecContext(): arangodb::ExecContext(
        arangodb::ExecContext::Type::Default, "", "testVocbase", arangodb::auth::Level::NONE, arangodb::auth::Level::NONE
      ) {}
    } execContext;
    arangodb::ExecContextScope execContextScope(&execContext);
    auto* authFeature = arangodb::AuthenticationFeature::instance();
    auto* userManager = authFeature->userManager();
    arangodb::aql::QueryRegistry queryRegistry(0); // required for UserManager::loadFromDB()
    userManager->setQueryRegistry(&queryRegistry);
    CHECK((false == logicalView->canUse(arangodb::auth::Level::RO)));
  }

  // no write access
  {
    TRI_vocbase_t vocbase(TRI_vocbase_type_e::TRI_VOCBASE_TYPE_NORMAL, 1, "testVocbase");
    auto logicalView = vocbase.createView(viewJson->slice());
    struct ExecContext: public arangodb::ExecContext {
      ExecContext(): arangodb::ExecContext(
        arangodb::ExecContext::Type::Default, "", "testVocbase", arangodb::auth::Level::NONE, arangodb::auth::Level::RO
      ) {}
    } execContext;
    arangodb::ExecContextScope execContextScope(&execContext);
    auto* authFeature = arangodb::AuthenticationFeature::instance();
    auto* userManager = authFeature->userManager();
    arangodb::aql::QueryRegistry queryRegistry(0); // required for UserManager::loadFromDB()
    userManager->setQueryRegistry(&queryRegistry);
    CHECK((true == logicalView->canUse(arangodb::auth::Level::RO)));
    CHECK((false == logicalView->canUse(arangodb::auth::Level::RW)));
  }

  // write access (view access is db access as per https://github.com/arangodb/backlog/issues/459)
  {
    TRI_vocbase_t vocbase(TRI_vocbase_type_e::TRI_VOCBASE_TYPE_NORMAL, 1, "testVocbase");
    auto logicalView = vocbase.createView(viewJson->slice());
    struct ExecContext: public arangodb::ExecContext {
      ExecContext(): arangodb::ExecContext(
        arangodb::ExecContext::Type::Default, "", "testVocbase", arangodb::auth::Level::NONE, arangodb::auth::Level::RW
      ) {}
    } execContext;
    arangodb::ExecContextScope execContextScope(&execContext);
    auto* authFeature = arangodb::AuthenticationFeature::instance();
    auto* userManager = authFeature->userManager();
    arangodb::aql::QueryRegistry queryRegistry(0); // required for UserManager::loadFromDB()
    userManager->setQueryRegistry(&queryRegistry);
    CHECK((true == logicalView->canUse(arangodb::auth::Level::RO)));
    CHECK((true == logicalView->canUse(arangodb::auth::Level::RW)));
  }
}

////////////////////////////////////////////////////////////////////////////////
/// @brief generate tests
////////////////////////////////////////////////////////////////////////////////

}

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