#include "swift/Syntax/ExprSyntax.h"
#include "swift/Syntax/SyntaxFactory.h"
#include "llvm/ADT/SmallString.h"
#include "gtest/gtest.h"

using llvm::None;
using llvm::SmallString;

using namespace swift;
using namespace swift::syntax;

FunctionCallArgumentSyntax getCannedArgument() {
  auto X = SyntaxFactory::makeIdentifier("x", {}, {});
  auto Foo = SyntaxFactory::makeIdentifier("foo", {}, {});
  auto Colon = SyntaxFactory::makeColonToken({}, Trivia::spaces(1));
  auto SymbolicRef = SyntaxFactory::makeSymbolicReferenceExpr(Foo, llvm::None);
  auto Comma = SyntaxFactory::makeCommaToken({}, Trivia::spaces(1));
  auto NoComma = TokenSyntax::missingToken(tok::comma, ",");

  return SyntaxFactory::makeFunctionCallArgument(X, Colon, SymbolicRef, Comma);
}

TEST(SyntaxCollectionTests, empty) {
  auto Empty = SyntaxFactory::makeBlankFunctionCallArgumentList();
  ASSERT_TRUE(Empty.empty());
  ASSERT_FALSE(Empty.appending(getCannedArgument()).empty());
}

TEST(SyntaxCollectionTests, size) {
  auto Empty = SyntaxFactory::makeBlankFunctionCallArgumentList();
  ASSERT_EQ(Empty.size(), size_t(0));
  ASSERT_EQ(Empty.appending(getCannedArgument()).size(), size_t(1));
}

TEST(SyntaxCollectionTests, subscript) {
  auto Empty = SyntaxFactory::makeBlankFunctionCallArgumentList();
#ifndef NDEBUG
  ASSERT_DEATH({ Empty[0]; }, "");
#endif

  SmallString<48> Scratch;
  llvm::raw_svector_ostream OS(Scratch);
  auto Arg = getCannedArgument();
  Arg.print(OS);

  auto List = Empty.appending(Arg);

  SmallString<48> GottenScratch;
  llvm::raw_svector_ostream GottenOS(Scratch);
  List[0].print(GottenOS);

  ASSERT_EQ(OS.str().str(), GottenOS.str().str());

  auto GottenArg1 = List[0];
  auto GottenArg2 = List[0];
  ASSERT_TRUE(GottenArg1.hasSameIdentityAs(GottenArg2));
}

TEST(SyntaxCollectionTests, appending) {
  auto Arg = getCannedArgument();
  auto NoComma = TokenSyntax::missingToken(tok::comma, ",");
  auto List = SyntaxFactory::makeBlankFunctionCallArgumentList()
    .appending(Arg)
    .appending(Arg)
    .appending(Arg.withTrailingComma(NoComma));

  ASSERT_EQ(List.size(), size_t(3));

  SmallString<48> Scratch;
  llvm::raw_svector_ostream OS(Scratch);
  List.print(OS);

  ASSERT_EQ(OS.str().str(), "x: foo, x: foo, x: foo");

  auto GottenArg0_1 = List[0];
  auto GottenArg0_2 = List[0];
  ASSERT_TRUE(GottenArg0_1.hasSameIdentityAs(GottenArg0_2));

  auto GottenArg1_1 = List[1];
  auto GottenArg1_2 = List[1];
  ASSERT_TRUE(GottenArg1_1.hasSameIdentityAs(GottenArg1_2));

  auto GottenArg2_1 = List[2];
  auto GottenArg2_2 = List[2];
  ASSERT_TRUE(GottenArg2_1.hasSameIdentityAs(GottenArg2_2));
}

TEST(SyntaxCollectionTests, removingLast) {
  ASSERT_DEATH({
    SyntaxFactory::makeBlankFunctionCallArgumentList().removingLast();
  }, "");
  auto Arg = getCannedArgument();
  auto NoComma = TokenSyntax::missingToken(tok::comma, ",");
  auto List = SyntaxFactory::makeBlankFunctionCallArgumentList()
    .appending(Arg)
    .appending(Arg)
    .appending(Arg.withTrailingComma(NoComma))
    .removingLast();
  SmallString<48> Scratch;
  llvm::raw_svector_ostream OS(Scratch);
  List.print(OS);
  ASSERT_EQ(OS.str().str(), "x: foo, x: foo, ");
}

TEST(SyntaxCollectionTests, prepending) {
  auto Arg = getCannedArgument();
  auto NoComma = TokenSyntax::missingToken(tok::comma, ",");
  auto List = SyntaxFactory::makeBlankFunctionCallArgumentList()
    .prepending(Arg.withTrailingComma(NoComma))
    .prepending(Arg
                  .withLabel(SyntaxFactory::makeIdentifier("schwifty", {}, {})))
    .prepending(Arg);

  ASSERT_EQ(List.size(), size_t(3));

  SmallString<48> Scratch;
  llvm::raw_svector_ostream OS(Scratch);
  List.print(OS);

  ASSERT_EQ(OS.str().str(), "x: foo, schwifty: foo, x: foo");

  auto GottenArg0_1 = List[0];
  auto GottenArg0_2 = List[0];
  ASSERT_TRUE(GottenArg0_1.hasSameIdentityAs(GottenArg0_2));

  auto GottenArg1_1 = List[1];
  auto GottenArg1_2 = List[1];
  ASSERT_TRUE(GottenArg1_1.hasSameIdentityAs(GottenArg1_2));

  auto GottenArg2_1 = List[2];
  auto GottenArg2_2 = List[2];
  ASSERT_TRUE(GottenArg2_1.hasSameIdentityAs(GottenArg2_2));
}

TEST(SyntaxCollectionTests, removingFirst) {
  ASSERT_DEATH({
    SyntaxFactory::makeBlankFunctionCallArgumentList().removingFirst();
  }, "");
  auto Arg = getCannedArgument();
  auto NoComma = TokenSyntax::missingToken(tok::comma, ",");
  auto List = SyntaxFactory::makeBlankFunctionCallArgumentList()
    .appending(Arg
                 .withLabel(SyntaxFactory::makeIdentifier("schwifty", {}, {})))
    .appending(Arg)
    .appending(Arg.withTrailingComma(NoComma))
    .removingFirst();
  SmallString<48> Scratch;
  llvm::raw_svector_ostream OS(Scratch);
  List.print(OS);
  ASSERT_EQ(OS.str().str(), "x: foo, x: foo");
}

TEST(SyntaxCollectionTests, inserting) {
  auto Arg = getCannedArgument();
  auto NoComma = TokenSyntax::missingToken(tok::comma, ",");
#ifndef NDEBUG
  ASSERT_DEATH({
    SyntaxFactory::makeBlankFunctionCallArgumentList().inserting(1, Arg);
  }, "");
#endif

  {
    SmallString<48> InsertedScratch;
    llvm::raw_svector_ostream InsertedOS(InsertedScratch);
    SyntaxFactory::makeBlankFunctionCallArgumentList()
      .inserting(0, Arg)
      .inserting(0, Arg)
      .inserting(0, Arg)
      .print(InsertedOS);

    SmallString<48> PrependedScratch;
    llvm::raw_svector_ostream PrependedOS(PrependedScratch);
    SyntaxFactory::makeBlankFunctionCallArgumentList()
      .prepending(Arg)
      .prepending(Arg)
      .prepending(Arg)
      .print(PrependedOS);
    ASSERT_EQ(InsertedOS.str().str(), PrependedOS.str().str());
  }

  {
    SmallString<48> InsertedScratch;
    llvm::raw_svector_ostream InsertedOS(InsertedScratch);
    SyntaxFactory::makeBlankFunctionCallArgumentList()
      .inserting(0, Arg)
      .inserting(1, Arg)
      .inserting(2, Arg)
      .print(InsertedOS);

    SmallString<48> AppendedScratch;
    llvm::raw_svector_ostream AppendedOS(AppendedScratch);
    SyntaxFactory::makeBlankFunctionCallArgumentList()
      .appending(Arg)
      .appending(Arg)
      .appending(Arg)
      .print(AppendedOS);
    ASSERT_EQ(InsertedOS.str().str(), AppendedOS.str().str());
  }

  {
    SmallString<48> Scratch;
    llvm::raw_svector_ostream OS(Scratch);
    SyntaxFactory::makeBlankFunctionCallArgumentList()
      .appending(Arg)
      .appending(Arg)
      .inserting(1,
                 Arg.withLabel(SyntaxFactory::makeIdentifier("schwifty",
                                                             {}, {})))
      .print(OS);
    ASSERT_EQ(OS.str().str(), "x: foo, schwifty: foo, x: foo, ");
  }
}

TEST(SyntaxCollectionTests, cleared) {
  auto Arg = getCannedArgument();
  SmallString<1> Scratch;
  llvm::raw_svector_ostream OS(Scratch);
  auto List = SyntaxFactory::makeBlankFunctionCallArgumentList()
    .appending(Arg)
    .appending(Arg)
    .appending(Arg)
    .cleared();

  List.print(OS);
  ASSERT_EQ(OS.str().str(), "");
  ASSERT_TRUE(List.empty());
  ASSERT_EQ(List.size(), size_t(0));
}

TEST(SyntaxCollectionTests, Iteration) {
  auto Arg = getCannedArgument();
  auto List = SyntaxFactory::makeBlankFunctionCallArgumentList()
    .appending(Arg)
    .appending(Arg)
    .appending(Arg);

  auto Element0 = List[0];
  auto Element1 = List[1];
  auto Element2 = List[2];

  SmallString<48> IteratedScratch;
  llvm::raw_svector_ostream IteratedOS(IteratedScratch);
  for (auto Element : List) {
    Element.print(IteratedOS);
  }
  ASSERT_EQ(IteratedOS.str().str(), "x: foo, x: foo, x: foo, ");

  auto IteratedElement0 = List[0];
  auto IteratedElement1 = List[1];
  auto IteratedElement2 = List[2];

  ASSERT_TRUE(Element0.hasSameIdentityAs(IteratedElement0));
  ASSERT_TRUE(Element1.hasSameIdentityAs(IteratedElement1));
  ASSERT_TRUE(Element2.hasSameIdentityAs(IteratedElement2));

  SmallString<48> Scratch;
  llvm::raw_svector_ostream OS(Scratch);
  List.print(OS);
  ASSERT_EQ(OS.str().str(), IteratedOS.str().str());
}