#include <algorithm>
#include <climits>
#include <string>
#include <unordered_map>
#include <vector>

#include "antlr4-runtime.h"
#include "dbms/dbms.hpp"
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "query/context.hpp"
#include "query/frontend/ast/ast.hpp"
#include "query/frontend/ast/cypher_main_visitor.hpp"
#include "query/frontend/opencypher/parser.hpp"

namespace {

using namespace query;
using namespace query::frontend;
using testing::UnorderedElementsAre;
using testing::Pair;

class AstGenerator {
 public:
  AstGenerator(const std::string &query)
      : dbms_(),
        db_accessor_(dbms_.active()),
        context_(Config{}, *db_accessor_),
        query_string_(query),
        parser_(query),
        visitor_(context_),
        query_([&]() {
          visitor_.visit(parser_.tree());
          return visitor_.query();
        }()) {}

  Dbms dbms_;
  std::unique_ptr<GraphDbAccessor> db_accessor_;
  Context context_;
  std::string query_string_;
  ::frontend::opencypher::Parser parser_;
  CypherMainVisitor visitor_;
  Query *query_;
};

TEST(CypherMainVisitorTest, SyntaxException) {
  ASSERT_THROW(AstGenerator("CREATE ()-[*1...2]-()"), SyntaxException);
}

TEST(CypherMainVisitorTest, PropertyLookup) {
  AstGenerator ast_generator("RETURN n.x");
  auto *query = ast_generator.query_;
  ASSERT_EQ(query->clauses_.size(), 1U);
  auto *return_clause = dynamic_cast<Return *>(query->clauses_[0]);
  auto *property_lookup = dynamic_cast<PropertyLookup *>(
      return_clause->named_expressions_[0]->expression_);
  ASSERT_TRUE(property_lookup->expression_);
  auto identifier = dynamic_cast<Identifier *>(property_lookup->expression_);
  ASSERT_TRUE(identifier);
  ASSERT_EQ(identifier->name_, "n");
  ASSERT_EQ(property_lookup->property_,
            ast_generator.db_accessor_->property("x"));
}

TEST(CypherMainVisitorTest, ReturnNamedIdentifier) {
  AstGenerator ast_generator("RETURN var AS var5");
  auto *query = ast_generator.query_;
  auto *return_clause = dynamic_cast<Return *>(query->clauses_[0]);
  auto *named_expr = return_clause->named_expressions_[0];
  ASSERT_EQ(named_expr->name_, "var5");
  auto *identifier = dynamic_cast<Identifier *>(named_expr->expression_);
  ASSERT_EQ(identifier->name_, "var");
}

TEST(CypherMainVisitorTest, IntegerLiteral) {
  AstGenerator ast_generator("RETURN 42");
  auto *query = ast_generator.query_;
  auto *return_clause = dynamic_cast<Return *>(query->clauses_[0]);
  auto *literal = dynamic_cast<Literal *>(
      return_clause->named_expressions_[0]->expression_);
  ASSERT_TRUE(literal);
  ASSERT_EQ(literal->value_.Value<int64_t>(), 42);
}

TEST(CypherMainVisitorTest, IntegerLiteralTooLarge) {
  ASSERT_THROW(AstGenerator("RETURN 10000000000000000000000000"),
               SemanticException);
}

TEST(CypherMainVisitorTest, BooleanLiteralTrue) {
  AstGenerator ast_generator("RETURN TrUe");
  auto *query = ast_generator.query_;
  auto *return_clause = dynamic_cast<Return *>(query->clauses_[0]);
  auto *literal = dynamic_cast<Literal *>(
      return_clause->named_expressions_[0]->expression_);
  ASSERT_TRUE(literal);
  ASSERT_EQ(literal->value_.Value<bool>(), true);
}

TEST(CypherMainVisitorTest, BooleanLiteralFalse) {
  AstGenerator ast_generator("RETURN faLSE");
  auto *query = ast_generator.query_;
  auto *return_clause = dynamic_cast<Return *>(query->clauses_[0]);
  auto *literal = dynamic_cast<Literal *>(
      return_clause->named_expressions_[0]->expression_);
  ASSERT_TRUE(literal);
  ASSERT_EQ(literal->value_.Value<bool>(), false);
}

TEST(CypherMainVisitorTest, NullLiteral) {
  AstGenerator ast_generator("RETURN nULl");
  auto *query = ast_generator.query_;
  auto *return_clause = dynamic_cast<Return *>(query->clauses_[0]);
  auto *literal = dynamic_cast<Literal *>(
      return_clause->named_expressions_[0]->expression_);
  ASSERT_TRUE(literal);
  ASSERT_EQ(literal->value_.type(), TypedValue::Type::Null);
}

TEST(CypherMainVisitorTest, OrOperator) {
  AstGenerator ast_generator("RETURN true Or false oR n");
  auto *query = ast_generator.query_;
  ASSERT_EQ(query->clauses_.size(), 1U);
  auto *return_clause = dynamic_cast<Return *>(query->clauses_[0]);
  auto *or_operator2 = dynamic_cast<OrOperator *>(
      return_clause->named_expressions_[0]->expression_);
  ASSERT_TRUE(or_operator2);
  auto *or_operator1 = dynamic_cast<OrOperator *>(or_operator2->expression1_);
  ASSERT_TRUE(or_operator1);
  auto *operand1 = dynamic_cast<Literal *>(or_operator1->expression1_);
  ASSERT_TRUE(operand1);
  ASSERT_EQ(operand1->value_.Value<bool>(), true);
  auto *operand2 = dynamic_cast<Literal *>(or_operator1->expression2_);
  ASSERT_TRUE(operand2);
  ASSERT_EQ(operand2->value_.Value<bool>(), false);
  auto *operand3 = dynamic_cast<Identifier *>(or_operator2->expression2_);
  ASSERT_TRUE(operand3);
  ASSERT_EQ(operand3->name_, "n");
}

TEST(CypherMainVisitorTest, XorOperator) {
  AstGenerator ast_generator("RETURN true xOr false");
  auto *query = ast_generator.query_;
  auto *return_clause = dynamic_cast<Return *>(query->clauses_[0]);
  auto *xor_operator = dynamic_cast<XorOperator *>(
      return_clause->named_expressions_[0]->expression_);
  auto *operand1 = dynamic_cast<Literal *>(xor_operator->expression1_);
  ASSERT_TRUE(operand1);
  ASSERT_EQ(operand1->value_.Value<bool>(), true);
  auto *operand2 = dynamic_cast<Literal *>(xor_operator->expression2_);
  ASSERT_TRUE(operand2);
  ASSERT_EQ(operand2->value_.Value<bool>(), false);
}

TEST(CypherMainVisitorTest, AndOperator) {
  AstGenerator ast_generator("RETURN true and false");
  auto *query = ast_generator.query_;
  auto *return_clause = dynamic_cast<Return *>(query->clauses_[0]);
  auto *and_operator = dynamic_cast<AndOperator *>(
      return_clause->named_expressions_[0]->expression_);
  auto *operand1 = dynamic_cast<Literal *>(and_operator->expression1_);
  ASSERT_TRUE(operand1);
  ASSERT_EQ(operand1->value_.Value<bool>(), true);
  auto *operand2 = dynamic_cast<Literal *>(and_operator->expression2_);
  ASSERT_TRUE(operand2);
  ASSERT_EQ(operand2->value_.Value<bool>(), false);
}

TEST(CypherMainVisitorTest, AdditionSubtractionOperators) {
  AstGenerator ast_generator("RETURN 1 - 2 + 3");
  auto *query = ast_generator.query_;
  auto *return_clause = dynamic_cast<Return *>(query->clauses_[0]);
  auto *addition_operator = dynamic_cast<AdditionOperator *>(
      return_clause->named_expressions_[0]->expression_);
  ASSERT_TRUE(addition_operator);
  auto *subtraction_operator =
      dynamic_cast<SubtractionOperator *>(addition_operator->expression1_);
  ASSERT_TRUE(subtraction_operator);
  auto *operand1 = dynamic_cast<Literal *>(subtraction_operator->expression1_);
  ASSERT_TRUE(operand1);
  ASSERT_EQ(operand1->value_.Value<int64_t>(), 1);
  auto *operand2 = dynamic_cast<Literal *>(subtraction_operator->expression2_);
  ASSERT_TRUE(operand2);
  ASSERT_EQ(operand2->value_.Value<int64_t>(), 2);
  auto *operand3 = dynamic_cast<Literal *>(addition_operator->expression2_);
  ASSERT_TRUE(operand3);
  ASSERT_EQ(operand3->value_.Value<int64_t>(), 3);
}

TEST(CypherMainVisitorTest, MulitplicationOperator) {
  AstGenerator ast_generator("RETURN 2 * 3");
  auto *query = ast_generator.query_;
  auto *return_clause = dynamic_cast<Return *>(query->clauses_[0]);
  auto *mult_operator = dynamic_cast<MultiplicationOperator *>(
      return_clause->named_expressions_[0]->expression_);
  auto *operand1 = dynamic_cast<Literal *>(mult_operator->expression1_);
  ASSERT_TRUE(operand1);
  ASSERT_EQ(operand1->value_.Value<int64_t>(), 2);
  auto *operand2 = dynamic_cast<Literal *>(mult_operator->expression2_);
  ASSERT_TRUE(operand2);
  ASSERT_EQ(operand2->value_.Value<int64_t>(), 3);
}

TEST(CypherMainVisitorTest, DivisionOperator) {
  AstGenerator ast_generator("RETURN 2 / 3");
  auto *query = ast_generator.query_;
  auto *return_clause = dynamic_cast<Return *>(query->clauses_[0]);
  auto *div_operator = dynamic_cast<DivisionOperator *>(
      return_clause->named_expressions_[0]->expression_);
  auto *operand1 = dynamic_cast<Literal *>(div_operator->expression1_);
  ASSERT_TRUE(operand1);
  ASSERT_EQ(operand1->value_.Value<int64_t>(), 2);
  auto *operand2 = dynamic_cast<Literal *>(div_operator->expression2_);
  ASSERT_TRUE(operand2);
  ASSERT_EQ(operand2->value_.Value<int64_t>(), 3);
}

TEST(CypherMainVisitorTest, ModOperator) {
  AstGenerator ast_generator("RETURN 2 % 3");
  auto *query = ast_generator.query_;
  auto *return_clause = dynamic_cast<Return *>(query->clauses_[0]);
  auto *mod_operator = dynamic_cast<ModOperator *>(
      return_clause->named_expressions_[0]->expression_);
  auto *operand1 = dynamic_cast<Literal *>(mod_operator->expression1_);
  ASSERT_TRUE(operand1);
  ASSERT_EQ(operand1->value_.Value<int64_t>(), 2);
  auto *operand2 = dynamic_cast<Literal *>(mod_operator->expression2_);
  ASSERT_TRUE(operand2);
  ASSERT_EQ(operand2->value_.Value<int64_t>(), 3);
}

#define CHECK_COMPARISON(TYPE, VALUE1, VALUE2)                             \
  do {                                                                     \
    auto *and_operator = dynamic_cast<AndOperator *>(_operator);           \
    ASSERT_TRUE(and_operator);                                             \
    _operator = and_operator->expression1_;                                \
    auto *cmp_operator = dynamic_cast<TYPE *>(and_operator->expression2_); \
    ASSERT_TRUE(cmp_operator);                                             \
    auto *operand1 = dynamic_cast<Literal *>(cmp_operator->expression1_);  \
    ASSERT_EQ(operand1->value_.Value<int64_t>(), VALUE1);                  \
    auto *operand2 = dynamic_cast<Literal *>(cmp_operator->expression2_);  \
    ASSERT_EQ(operand2->value_.Value<int64_t>(), VALUE2);                  \
  } while (0)

TEST(CypherMainVisitorTest, ComparisonOperators) {
  AstGenerator ast_generator("RETURN 2 = 3 != 4 <> 5 < 6 > 7 <= 8 >= 9");
  auto *query = ast_generator.query_;
  auto *return_clause = dynamic_cast<Return *>(query->clauses_[0]);
  Expression *_operator = return_clause->named_expressions_[0]->expression_;
  CHECK_COMPARISON(GreaterEqualOperator, 8, 9);
  CHECK_COMPARISON(LessEqualOperator, 7, 8);
  CHECK_COMPARISON(GreaterOperator, 6, 7);
  CHECK_COMPARISON(LessOperator, 5, 6);
  CHECK_COMPARISON(NotEqualOperator, 4, 5);
  CHECK_COMPARISON(NotEqualOperator, 3, 4);
  auto *cmp_operator = dynamic_cast<EqualOperator *>(_operator);
  ASSERT_TRUE(cmp_operator);
  auto *operand1 = dynamic_cast<Literal *>(cmp_operator->expression1_);
  ASSERT_EQ(operand1->value_.Value<int64_t>(), 2);
  auto *operand2 = dynamic_cast<Literal *>(cmp_operator->expression2_);
  ASSERT_EQ(operand2->value_.Value<int64_t>(), 3);
}

#undef CHECK_COMPARISON

TEST(CypherMainVisitorTest, NotOperator) {
  AstGenerator ast_generator("RETURN not true");
  auto *query = ast_generator.query_;
  auto *return_clause = dynamic_cast<Return *>(query->clauses_[0]);
  auto *not_operator = dynamic_cast<NotOperator *>(
      return_clause->named_expressions_[0]->expression_);
  auto *operand = dynamic_cast<Literal *>(not_operator->expression_);
  ASSERT_TRUE(operand);
  ASSERT_EQ(operand->value_.Value<bool>(), true);
}

TEST(CypherMainVisitorTest, UnaryMinusPlusOperators) {
  AstGenerator ast_generator("RETURN -+5");
  auto *query = ast_generator.query_;
  auto *return_clause = dynamic_cast<Return *>(query->clauses_[0]);
  auto *unary_minus_operator = dynamic_cast<UnaryMinusOperator *>(
      return_clause->named_expressions_[0]->expression_);
  ASSERT_TRUE(unary_minus_operator);
  auto *unary_plus_operator =
      dynamic_cast<UnaryPlusOperator *>(unary_minus_operator->expression_);
  ASSERT_TRUE(unary_plus_operator);
  auto *operand = dynamic_cast<Literal *>(unary_plus_operator->expression_);
  ASSERT_TRUE(operand);
  ASSERT_EQ(operand->value_.Value<int64_t>(), 5);
}

TEST(CypherMainVisitorTest, StringLiteralDoubleQuotes) {
  AstGenerator ast_generator("RETURN \"mi'rko\"");
  auto *query = ast_generator.query_;
  auto *return_clause = dynamic_cast<Return *>(query->clauses_[0]);
  auto *literal = dynamic_cast<Literal *>(
      return_clause->named_expressions_[0]->expression_);
  ASSERT_TRUE(literal);
  ASSERT_EQ(literal->value_.Value<std::string>(), "mi'rko");
}

TEST(CypherMainVisitorTest, StringLiteralSingleQuotes) {
  AstGenerator ast_generator("RETURN 'mi\"rko'");
  auto *query = ast_generator.query_;
  auto *return_clause = dynamic_cast<Return *>(query->clauses_[0]);
  auto *literal = dynamic_cast<Literal *>(
      return_clause->named_expressions_[0]->expression_);
  ASSERT_TRUE(literal);
  ASSERT_EQ(literal->value_.Value<std::string>(), "mi\"rko");
}

TEST(CypherMainVisitorTest, StringLiteralEscapedChars) {
  AstGenerator ast_generator(
      "RETURN '\\\\\\'\\\"\\b\\B\\f\\F\\n\\N\\r\\R\\t\\T'");
  auto *query = ast_generator.query_;
  auto *return_clause = dynamic_cast<Return *>(query->clauses_[0]);
  auto *literal = dynamic_cast<Literal *>(
      return_clause->named_expressions_[0]->expression_);
  ASSERT_TRUE(literal);
  ASSERT_EQ(literal->value_.Value<std::string>(), "\\'\"\b\b\f\f\n\n\r\r\t\t");
}

TEST(CypherMainVisitorTest, StringLiteralEscapedUtf16) {
  AstGenerator ast_generator("RETURN '\\u221daaa\\U221daaa'");
  auto *query = ast_generator.query_;
  auto *return_clause = dynamic_cast<Return *>(query->clauses_[0]);
  auto *literal = dynamic_cast<Literal *>(
      return_clause->named_expressions_[0]->expression_);
  ASSERT_TRUE(literal);
  ASSERT_EQ(literal->value_.Value<std::string>(), u8"\u221daaa\u221daaa");
}

TEST(CypherMainVisitorTest, StringLiteralEscapedUtf32) {
  AstGenerator ast_generator("RETURN '\\u0001F600aaaa\\U0001F600aaaaaaaa'");
  auto *query = ast_generator.query_;
  auto *return_clause = dynamic_cast<Return *>(query->clauses_[0]);
  auto *literal = dynamic_cast<Literal *>(
      return_clause->named_expressions_[0]->expression_);
  ASSERT_TRUE(literal);
  ASSERT_EQ(literal->value_.Value<std::string>(),
            u8"\U0001F600aaaa\U0001F600aaaaaaaa");
}

TEST(CypherMainVisitorTest, DoubleLiteral) {
  AstGenerator ast_generator("RETURN 3.5");
  auto *query = ast_generator.query_;
  auto *return_clause = dynamic_cast<Return *>(query->clauses_[0]);
  auto *literal = dynamic_cast<Literal *>(
      return_clause->named_expressions_[0]->expression_);
  ASSERT_TRUE(literal);
  ASSERT_EQ(literal->value_.Value<double>(), 3.5);
}

TEST(CypherMainVisitorTest, DoubleLiteralExponent) {
  AstGenerator ast_generator("RETURN 5e-1");
  auto *query = ast_generator.query_;
  auto *return_clause = dynamic_cast<Return *>(query->clauses_[0]);
  auto *literal = dynamic_cast<Literal *>(
      return_clause->named_expressions_[0]->expression_);
  ASSERT_TRUE(literal);
  ASSERT_EQ(literal->value_.Value<double>(), 0.5);
}

TEST(CypherMainVisitorTest, NodePattern) {
  AstGenerator ast_generator("MATCH (:label1:label2:label3 {a : 5, b : 10})");
  auto *query = ast_generator.query_;
  ASSERT_EQ(query->clauses_.size(), 1U);
  auto *match = dynamic_cast<Match *>(query->clauses_[0]);
  ASSERT_TRUE(match);
  ASSERT_EQ(match->patterns_.size(), 1U);
  ASSERT_TRUE(match->patterns_[0]);
  ASSERT_EQ(match->patterns_[0]->atoms_.size(), 1U);
  auto node = dynamic_cast<NodeAtom *>(match->patterns_[0]->atoms_[0]);
  ASSERT_TRUE(node);
  ASSERT_TRUE(node->identifier_);
  ASSERT_EQ(node->identifier_->name_,
            CypherMainVisitor::kAnonPrefix + std::to_string(1));
  ASSERT_THAT(node->labels_, UnorderedElementsAre(
                                 ast_generator.db_accessor_->label("label1"),
                                 ast_generator.db_accessor_->label("label2"),
                                 ast_generator.db_accessor_->label("label3")));
  std::unordered_map<GraphDb::Property, int64_t> properties;
  for (auto x : node->properties_) {
    auto *literal = dynamic_cast<Literal *>(x.second);
    ASSERT_TRUE(literal);
    ASSERT_TRUE(literal->value_.type() == TypedValue::Type::Int);
    properties[x.first] = literal->value_.Value<int64_t>();
  }
  ASSERT_THAT(properties,
              UnorderedElementsAre(
                  Pair(ast_generator.db_accessor_->property("a"), 5),
                  Pair(ast_generator.db_accessor_->property("b"), 10)));
}

TEST(CypherMainVisitorTest, NodePatternIdentifier) {
  AstGenerator ast_generator("MATCH (var)");
  auto *query = ast_generator.query_;
  auto *match = dynamic_cast<Match *>(query->clauses_[0]);
  auto node = dynamic_cast<NodeAtom *>(match->patterns_[0]->atoms_[0]);
  ASSERT_TRUE(node->identifier_);
  ASSERT_EQ(node->identifier_->name_, "var");
  ASSERT_THAT(node->labels_, UnorderedElementsAre());
  ASSERT_THAT(node->properties_, UnorderedElementsAre());
}

TEST(CypherMainVisitorTest, RelationshipPatternNoDetails) {
  AstGenerator ast_generator("MATCH ()--()");
  auto *query = ast_generator.query_;
  auto *match = dynamic_cast<Match *>(query->clauses_[0]);
  ASSERT_EQ(match->patterns_.size(), 1U);
  ASSERT_TRUE(match->patterns_[0]);
  ASSERT_EQ(match->patterns_[0]->atoms_.size(), 3U);
  auto *node1 = dynamic_cast<NodeAtom *>(match->patterns_[0]->atoms_[0]);
  ASSERT_TRUE(node1);
  auto *edge = dynamic_cast<EdgeAtom *>(match->patterns_[0]->atoms_[1]);
  ASSERT_TRUE(edge);
  auto *node2 = dynamic_cast<NodeAtom *>(match->patterns_[0]->atoms_[2]);
  ASSERT_TRUE(node2);
  ASSERT_EQ(edge->direction_, EdgeAtom::Direction::BOTH);
  ASSERT_TRUE(edge->identifier_);
  ASSERT_THAT(edge->identifier_->name_,
              CypherMainVisitor::kAnonPrefix + std::to_string(2));
}

// PatternPart in braces.
TEST(CypherMainVisitorTest, PatternPartBraces) {
  AstGenerator ast_generator("MATCH ((()--()))");
  auto *query = ast_generator.query_;
  auto *match = dynamic_cast<Match *>(query->clauses_[0]);
  ASSERT_EQ(match->patterns_.size(), 1U);
  ASSERT_TRUE(match->patterns_[0]);
  ASSERT_EQ(match->patterns_[0]->atoms_.size(), 3U);
  auto *node1 = dynamic_cast<NodeAtom *>(match->patterns_[0]->atoms_[0]);
  ASSERT_TRUE(node1);
  auto *edge = dynamic_cast<EdgeAtom *>(match->patterns_[0]->atoms_[1]);
  ASSERT_TRUE(edge);
  auto *node2 = dynamic_cast<NodeAtom *>(match->patterns_[0]->atoms_[2]);
  ASSERT_TRUE(node2);
  ASSERT_EQ(edge->direction_, EdgeAtom::Direction::BOTH);
  ASSERT_TRUE(edge->identifier_);
  ASSERT_THAT(edge->identifier_->name_,
              CypherMainVisitor::kAnonPrefix + std::to_string(2));
}

TEST(CypherMainVisitorTest, RelationshipPatternDetails) {
  AstGenerator ast_generator("MATCH ()<-[:type1|type2 {a : 5, b : 10}]-()");
  auto *query = ast_generator.query_;
  auto *match = dynamic_cast<Match *>(query->clauses_[0]);
  auto *edge = dynamic_cast<EdgeAtom *>(match->patterns_[0]->atoms_[1]);
  ASSERT_EQ(edge->direction_, EdgeAtom::Direction::LEFT);
  ASSERT_THAT(
      edge->edge_types_,
      UnorderedElementsAre(ast_generator.db_accessor_->edge_type("type1"),
                           ast_generator.db_accessor_->edge_type("type2")));
  std::unordered_map<GraphDb::Property, int64_t> properties;
  for (auto x : edge->properties_) {
    auto *literal = dynamic_cast<Literal *>(x.second);
    ASSERT_TRUE(literal);
    ASSERT_TRUE(literal->value_.type() == TypedValue::Type::Int);
    properties[x.first] = literal->value_.Value<int64_t>();
  }
  ASSERT_THAT(properties,
              UnorderedElementsAre(
                  Pair(ast_generator.db_accessor_->property("a"), 5),
                  Pair(ast_generator.db_accessor_->property("b"), 10)));
}

TEST(CypherMainVisitorTest, RelationshipPatternVariable) {
  AstGenerator ast_generator("MATCH ()-[var]->()");
  auto *query = ast_generator.query_;
  auto *match = dynamic_cast<Match *>(query->clauses_[0]);
  auto *edge = dynamic_cast<EdgeAtom *>(match->patterns_[0]->atoms_[1]);
  ASSERT_EQ(edge->direction_, EdgeAtom::Direction::RIGHT);
  ASSERT_TRUE(edge->identifier_);
  ASSERT_THAT(edge->identifier_->name_, "var");
}

// // Relationship with unbounded variable range.
// TEST(CypherMainVisitorTest, RelationshipPatternUnbounded) {
//   ParserTables parser("CREATE ()-[*]-()");
//   ASSERT_EQ(parser.identifiers_map_.size(), 0U);
//   ASSERT_EQ(parser.relationships_.size(), 1U);
//   CompareRelationships(*parser.relationships_.begin(),
//                        Relationship::Direction::BOTH, {}, {}, true, 1,
//                        LLONG_MAX);
// }
//
// // Relationship with lower bounded variable range.
// TEST(CypherMainVisitorTest, RelationshipPatternLowerBounded) {
//   ParserTables parser("CREATE ()-[*5..]-()");
//   ASSERT_EQ(parser.identifiers_map_.size(), 0U);
//   ASSERT_EQ(parser.relationships_.size(), 1U);
//   CompareRelationships(*parser.relationships_.begin(),
//                        Relationship::Direction::BOTH, {}, {}, true, 5,
//                        LLONG_MAX);
// }
//
// // Relationship with upper bounded variable range.
// TEST(CypherMainVisitorTest, RelationshipPatternUpperBounded) {
//   ParserTables parser("CREATE ()-[*..10]-()");
//   ASSERT_EQ(parser.identifiers_map_.size(), 0U);
//   ASSERT_EQ(parser.relationships_.size(), 1U);
//   CompareRelationships(*parser.relationships_.begin(),
//                        Relationship::Direction::BOTH, {}, {}, true, 1, 10);
// }
//
// // Relationship with lower and upper bounded variable range.
// TEST(CypherMainVisitorTest, RelationshipPatternLowerUpperBounded) {
//   ParserTables parser("CREATE ()-[*5..10]-()");
//   ASSERT_EQ(parser.identifiers_map_.size(), 0U);
//   ASSERT_EQ(parser.relationships_.size(), 1U);
//   CompareRelationships(*parser.relationships_.begin(),
//                        Relationship::Direction::BOTH, {}, {}, true, 5, 10);
// }
//
// // Relationship with fixed number of edges.
// TEST(CypherMainVisitorTest, RelationshipPatternFixedRange) {
//   ParserTables parser("CREATE ()-[*10]-()");
//   ASSERT_EQ(parser.identifiers_map_.size(), 0U);
//   ASSERT_EQ(parser.relationships_.size(), 1U);
//   CompareRelationships(*parser.relationships_.begin(),
//                        Relationship::Direction::BOTH, {}, {}, true, 10, 10);
// }
//
//
// // PatternPart with variable.
// TEST(CypherMainVisitorTest, PatternPartVariable) {
//   ParserTables parser("CREATE var=()--()");
//   ASSERT_EQ(parser.identifiers_map_.size(), 1U);
//   ASSERT_EQ(parser.pattern_parts_.size(), 1U);
//   ASSERT_EQ(parser.relationships_.size(), 1U);
//   ASSERT_EQ(parser.nodes_.size(), 2U);
//   ASSERT_EQ(parser.pattern_parts_.begin()->second.nodes.size(), 2U);
//   ASSERT_EQ(parser.pattern_parts_.begin()->second.relationships.size(), 1U);
//   ASSERT_NE(parser.identifiers_map_.find("var"),
//   parser.identifiers_map_.end());
//   auto output_identifier = parser.identifiers_map_["var"];
//   ASSERT_NE(parser.pattern_parts_.find(output_identifier),
//             parser.pattern_parts_.end());
// }

TEST(CypherMainVisitorTest, ReturnUnanemdIdentifier) {
  AstGenerator ast_generator("RETURN var");
  auto *query = ast_generator.query_;
  ASSERT_EQ(query->clauses_.size(), 1U);
  auto *return_clause = dynamic_cast<Return *>(query->clauses_[0]);
  ASSERT_TRUE(return_clause);
  ASSERT_EQ(return_clause->named_expressions_.size(), 1U);
  auto *named_expr = return_clause->named_expressions_[0];
  ASSERT_TRUE(named_expr);
  ASSERT_EQ(named_expr->name_, "var");
  auto *identifier = dynamic_cast<Identifier *>(named_expr->expression_);
  ASSERT_TRUE(identifier);
  ASSERT_EQ(identifier->name_, "var");
}

TEST(CypherMainVisitorTest, Create) {
  AstGenerator ast_generator("CREATE (n)");
  auto *query = ast_generator.query_;
  ASSERT_EQ(query->clauses_.size(), 1U);
  auto *create = dynamic_cast<Create *>(query->clauses_[0]);
  ASSERT_TRUE(create);
  ASSERT_EQ(create->patterns_.size(), 1U);
  ASSERT_TRUE(create->patterns_[0]);
  ASSERT_EQ(create->patterns_[0]->atoms_.size(), 1U);
  auto node = dynamic_cast<NodeAtom *>(create->patterns_[0]->atoms_[0]);
  ASSERT_TRUE(node);
  ASSERT_TRUE(node->identifier_);
  ASSERT_EQ(node->identifier_->name_, "n");
}
}