////////////////////////////////////////////////////////////////////////////////
/// 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 "IResearchQueryCommon.h"

#include "IResearch/IResearchView.h"
#include "Transaction/StandaloneContext.h"
#include "Utils/OperationOptions.h"
#include "Utils/SingleCollectionTransaction.h"
#include "VocBase/LogicalCollection.h"
#include "VocBase/ManagedDocumentResult.h"

#include <velocypack/Iterator.h>

namespace {
static const VPackBuilder systemDatabaseBuilder = dbArgsBuilder();
static const VPackSlice   systemDatabaseArgs = systemDatabaseBuilder.slice();

struct TestTermAttribute : public irs::term_attribute {
 public:
  void value(irs::bytes_ref const& value) { value_ = value; }
};

class TestDelimAnalyzer : public irs::analysis::analyzer {
 public:
  DECLARE_ANALYZER_TYPE();

  static ptr make(irs::string_ref const& args) {
    auto slice = arangodb::iresearch::slice(args);
    if (slice.isNull()) throw std::exception();
    if (slice.isNone()) return nullptr;
    if (slice.isString()) {
      PTR_NAMED(TestDelimAnalyzer, ptr, arangodb::iresearch::getStringRef(slice));
      return ptr;
    } else if (slice.isObject() && slice.hasKey("args") && slice.get("args").isString()) {
      PTR_NAMED(TestDelimAnalyzer, ptr,
                arangodb::iresearch::getStringRef(slice.get("args")));
      return ptr;
    } else {
      return nullptr;
    }
  }

  static bool normalize(irs::string_ref const& args, std::string& out) {
    auto slice = arangodb::iresearch::slice(args);
    if (slice.isNull()) throw std::exception();
    if (slice.isNone()) return false;
    arangodb::velocypack::Builder builder;
    if (slice.isString()) {
      VPackObjectBuilder scope(&builder);
      arangodb::iresearch::addStringRef(builder, "args",
                                        arangodb::iresearch::getStringRef(slice));
    } else if (slice.isObject() && slice.hasKey("args") && slice.get("args").isString()) {
      VPackObjectBuilder scope(&builder);
      arangodb::iresearch::addStringRef(builder, "args",
                                        arangodb::iresearch::getStringRef(slice.get("args")));
    } else {
      return false;
    }

    out = builder.buffer()->toString();
    return true;
  }

  TestDelimAnalyzer(irs::string_ref const& delim)
      : irs::analysis::analyzer(TestDelimAnalyzer::type()),
        _delim(irs::ref_cast<irs::byte_type>(delim)) {
    _attrs.emplace(_term);
  }

  virtual irs::attribute_view const& attributes() const NOEXCEPT override {
    return _attrs;
  }

  virtual bool next() override {
    if (_data.empty()) {
      return false;
    }

    size_t i = 0;

    for (size_t count = _data.size(); i < count; ++i) {
      auto data = irs::ref_cast<char>(_data);
      auto delim = irs::ref_cast<char>(_delim);

      if (0 == strncmp(&(data.c_str()[i]), delim.c_str(), delim.size())) {
        _term.value(irs::bytes_ref(_data.c_str(), i));
        _data =
            irs::bytes_ref(_data.c_str() + i + (std::max)(size_t(1), _delim.size()),
                           _data.size() - i - (std::max)(size_t(1), _delim.size()));
        return true;
      }
    }

    _term.value(_data);
    _data = irs::bytes_ref::NIL;
    return true;
  }

  virtual bool reset(irs::string_ref const& data) override {
    _data = irs::ref_cast<irs::byte_type>(data);
    return true;
  }

 private:
  irs::attribute_view _attrs;
  std::basic_string<irs::byte_type> _delim;
  irs::bytes_ref _data;
  TestTermAttribute _term;
};

DEFINE_ANALYZER_TYPE_NAMED(TestDelimAnalyzer, "TestDelimAnalyzer");
REGISTER_ANALYZER_VPACK(TestDelimAnalyzer, TestDelimAnalyzer::make, TestDelimAnalyzer::normalize);

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

class IResearchQueryTokensTest : public IResearchQueryTest {};

}  // namespace

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

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

TEST_F(IResearchQueryTokensTest, test) {
  TRI_vocbase_t vocbase(TRI_vocbase_type_e::TRI_VOCBASE_TYPE_NORMAL, testDBInfo(server.server()));
  std::vector<arangodb::velocypack::Builder> insertedDocs;
  arangodb::LogicalView* view;

  // create collection0
  {
    auto createJson = arangodb::velocypack::Parser::fromJson(
        "{ \"name\": \"testCollection0\" }");
    auto collection = vocbase.createCollection(createJson->slice());
    ASSERT_NE(nullptr, collection);

    std::vector<std::shared_ptr<arangodb::velocypack::Builder>> docs{
        VPackParser::fromJson("{ \"seq\": -6, \"value\": null }"),
        VPackParser::fromJson("{ \"seq\": -5, \"value\": true }"),
        VPackParser::fromJson("{ \"seq\": -4, \"value\": \"abc\" }"),
        VPackParser::fromJson("{ \"seq\": -3, \"value\": 3.14 }"),
        VPackParser::fromJson("{ \"seq\": -2, \"value\": [ 1, \"abc\" ] }"),
        VPackParser::fromJson("{ \"seq\": -1, \"value\": { \"a\": 7, \"b\": \"c\" } }"),
    };

    arangodb::OperationOptions options;
    options.returnNew = true;
    arangodb::SingleCollectionTransaction trx(arangodb::transaction::StandaloneContext::Create(vocbase),
                                              *collection,
                                              arangodb::AccessMode::Type::WRITE);
    EXPECT_TRUE(trx.begin().ok());

    for (auto& entry : docs) {
      auto res = trx.insert(collection->name(), entry->slice(), options);
      EXPECT_TRUE(res.ok());
      insertedDocs.emplace_back(res.slice().get("new"));
    }

    EXPECT_TRUE(trx.commit().ok());
  }

  // create collection1
  {
    auto createJson = arangodb::velocypack::Parser::fromJson(
        "{ \"name\": \"testCollection1\" }");
    auto collection = vocbase.createCollection(createJson->slice());
    ASSERT_NE(nullptr, collection);

    irs::utf8_path resource;
    resource /= irs::string_ref(arangodb::tests::testResourceDir);
    resource /= irs::string_ref("simple_sequential.json");

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

    arangodb::OperationOptions options;
    options.returnNew = true;
    arangodb::SingleCollectionTransaction trx(arangodb::transaction::StandaloneContext::Create(vocbase),
                                              *collection,
                                              arangodb::AccessMode::Type::WRITE);
    EXPECT_TRUE(trx.begin().ok());

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto res = trx.insert(collection->name(), itr.value(), options);
      EXPECT_TRUE(res.ok());
      insertedDocs.emplace_back(res.slice().get("new"));
    }

    EXPECT_TRUE(trx.commit().ok());
  }

  // create view
  {
    auto createJson = arangodb::velocypack::Parser::fromJson(
        "{ \"name\": \"testView\", \"type\": \"arangosearch\" }");
    auto logicalView = vocbase.createView(createJson->slice());
    ASSERT_FALSE(!logicalView);

    view = logicalView.get();
    auto* impl = dynamic_cast<arangodb::iresearch::IResearchView*>(view);
    ASSERT_FALSE(!impl);

    auto updateJson = arangodb::velocypack::Parser::fromJson(
        "{ \"links\": {"
        "\"testCollection0\": { \"includeAllFields\": true, "
        "\"trackListPositions\": true },"
        "\"testCollection1\": { \"includeAllFields\": true }"
        "}}");
    EXPECT_TRUE(impl->properties(updateJson->slice(), true).ok());
    std::set<TRI_voc_cid_t> cids;
    impl->visitCollections([&cids](TRI_voc_cid_t cid) -> bool {
      cids.emplace(cid);
      return true;
    });
    EXPECT_EQ(2, cids.size());
    EXPECT_TRUE(
        (arangodb::tests::executeQuery(vocbase,
                                       "FOR d IN testView SEARCH 1 ==1 OPTIONS "
                                       "{ waitForSync: true } RETURN d")
             .result.ok()));  // commit
  }

  // test no-match
  {
    std::vector<arangodb::velocypack::Slice> expected = {};
    auto result = arangodb::tests::executeQuery(
        vocbase,
        "FOR d IN testView SEARCH d.prefix IN TOKENS('def', "
        "'test_csv_analyzer') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d");
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE(i < expected.size());
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++],
                                                                    resolved, true)));
    }

    EXPECT_EQ(i, expected.size());
  }

  // test no-match via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {};
    auto result = arangodb::tests::executeQuery(
        vocbase,
        "FOR d IN testView SEARCH d['prefix'] IN TOKENS('def', "
        "'test_csv_analyzer') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d");
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE(i < expected.size());
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++],
                                                                    resolved, true)));
    }

    EXPECT_EQ(i, expected.size());
  }

  // test single match
  {
    std::vector<arangodb::velocypack::Slice> expected = {
        insertedDocs[9].slice(),
    };
    auto result = arangodb::tests::executeQuery(
        vocbase,
        "FOR d IN testView SEARCH d.prefix IN TOKENS('ab,abcde,de', "
        "'test_csv_analyzer') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d");
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;
    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE(i < expected.size());
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++],
                                                                    resolved, true)));
    }

    EXPECT_EQ(i, expected.size());
  }

  // test single match via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
        insertedDocs[9].slice(),
    };
    auto result = arangodb::tests::executeQuery(
        vocbase,
        "FOR d IN testView SEARCH d['prefix'] IN TOKENS('ab,abcde,de', "
        "'test_csv_analyzer') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d");
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE(i < expected.size());
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++],
                                                                    resolved, true)));
    }

    EXPECT_EQ(i, expected.size());
  }

  // test mulptiple match
  {
    std::vector<arangodb::velocypack::Slice> expected = {
        insertedDocs[36].slice(),  // (duplicate term)
        insertedDocs[37].slice(),  // (duplicate term)
        insertedDocs[6].slice(),   // (unique term)
        insertedDocs[26].slice(),  // (unique term)
    };
    auto result = arangodb::tests::executeQuery(
        vocbase,
        "FOR d IN testView SEARCH d.prefix IN TOKENS('z,xy,abcy,abcd,abc', "
        "'test_csv_analyzer') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d");
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE(i < expected.size());
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++],
                                                                    resolved, true)));
    }

    EXPECT_EQ(i, expected.size());
  }

  // test mulptiple match via []
  {
    std::vector<arangodb::velocypack::Slice> expected = {
        insertedDocs[36].slice(),  // (duplicate term)
        insertedDocs[37].slice(),  // (duplicate term)
        insertedDocs[6].slice(),   // (unique term)
        insertedDocs[26].slice(),  // (unique term)
    };
    auto result = arangodb::tests::executeQuery(
        vocbase,
        "FOR d IN testView SEARCH d['prefix'] IN TOKENS('z,xy,abcy,abcd,abc', "
        "'test_csv_analyzer') SORT BM25(d) ASC, TFIDF(d) DESC, d.seq RETURN d");
    ASSERT_TRUE(result.result.ok());
    auto slice = result.data->slice();
    EXPECT_TRUE(slice.isArray());
    size_t i = 0;

    for (arangodb::velocypack::ArrayIterator itr(slice); itr.valid(); ++itr) {
      auto const resolved = itr.value().resolveExternals();
      EXPECT_TRUE(i < expected.size());
      EXPECT_TRUE((0 == arangodb::basics::VelocyPackHelper::compare(expected[i++],
                                                                    resolved, true)));
    }

    EXPECT_EQ(i, expected.size());
  }
}