
// Copyright 2020 The Tint Authors.
//
// 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.

#include "src/type_determiner.h"

#include <memory>
#include <utility>

#include "gtest/gtest.h"
#include "src/ast/array_accessor_expression.h"
#include "src/ast/as_expression.h"
#include "src/ast/assignment_statement.h"
#include "src/ast/break_statement.h"
#include "src/ast/call_expression.h"
#include "src/ast/case_statement.h"
#include "src/ast/cast_expression.h"
#include "src/ast/continue_statement.h"
#include "src/ast/else_statement.h"
#include "src/ast/float_literal.h"
#include "src/ast/identifier_expression.h"
#include "src/ast/if_statement.h"
#include "src/ast/int_literal.h"
#include "src/ast/loop_statement.h"
#include "src/ast/member_accessor_expression.h"
#include "src/ast/regardless_statement.h"
#include "src/ast/return_statement.h"
#include "src/ast/scalar_constructor_expression.h"
#include "src/ast/struct.h"
#include "src/ast/struct_member.h"
#include "src/ast/switch_statement.h"
#include "src/ast/type/array_type.h"
#include "src/ast/type/f32_type.h"
#include "src/ast/type/i32_type.h"
#include "src/ast/type/matrix_type.h"
#include "src/ast/type/struct_type.h"
#include "src/ast/type/vector_type.h"
#include "src/ast/type_constructor_expression.h"
#include "src/ast/unless_statement.h"
#include "src/ast/variable_decl_statement.h"

namespace tint {
namespace {

class TypeDeterminerTest : public testing::Test {
 public:
  void SetUp() { td_ = std::make_unique<TypeDeterminer>(&ctx_); }

  TypeDeterminer* td() const { return td_.get(); }

 private:
  Context ctx_;
  std::unique_ptr<TypeDeterminer> td_;
};

TEST_F(TypeDeterminerTest, Stmt_Assign) {
  ast::type::F32Type f32;
  ast::type::I32Type i32;

  auto lhs = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::IntLiteral>(&i32, 2));
  auto lhs_ptr = lhs.get();

  auto rhs = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::FloatLiteral>(&f32, 2.3f));
  auto rhs_ptr = rhs.get();

  ast::AssignmentStatement assign(std::move(lhs), std::move(rhs));

  EXPECT_TRUE(td()->DetermineResultType(&assign));
  ASSERT_NE(lhs_ptr->result_type(), nullptr);
  ASSERT_NE(rhs_ptr->result_type(), nullptr);

  EXPECT_TRUE(lhs_ptr->result_type()->IsI32());
  EXPECT_TRUE(rhs_ptr->result_type()->IsF32());
}

TEST_F(TypeDeterminerTest, Stmt_Break) {
  ast::type::I32Type i32;

  auto cond = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::IntLiteral>(&i32, 2));
  auto cond_ptr = cond.get();

  ast::BreakStatement brk(ast::StatementCondition::kIf, std::move(cond));

  EXPECT_TRUE(td()->DetermineResultType(&brk));
  ASSERT_NE(cond_ptr->result_type(), nullptr);
  EXPECT_TRUE(cond_ptr->result_type()->IsI32());
}

TEST_F(TypeDeterminerTest, Stmt_Case) {
  ast::type::I32Type i32;
  ast::type::F32Type f32;

  auto lhs = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::IntLiteral>(&i32, 2));
  auto lhs_ptr = lhs.get();

  auto rhs = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::FloatLiteral>(&f32, 2.3f));
  auto rhs_ptr = rhs.get();

  ast::StatementList body;
  body.push_back(std::make_unique<ast::AssignmentStatement>(std::move(lhs),
                                                            std::move(rhs)));

  ast::CaseStatement cse(std::make_unique<ast::IntLiteral>(&i32, 3),
                         std::move(body));

  EXPECT_TRUE(td()->DetermineResultType(&cse));
  ASSERT_NE(lhs_ptr->result_type(), nullptr);
  ASSERT_NE(rhs_ptr->result_type(), nullptr);
  EXPECT_TRUE(lhs_ptr->result_type()->IsI32());
  EXPECT_TRUE(rhs_ptr->result_type()->IsF32());
}

TEST_F(TypeDeterminerTest, Stmt_Continue) {
  ast::type::I32Type i32;

  auto cond = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::IntLiteral>(&i32, 2));
  auto cond_ptr = cond.get();

  ast::ContinueStatement stmt(ast::StatementCondition::kIf, std::move(cond));

  EXPECT_TRUE(td()->DetermineResultType(&stmt));
  ASSERT_NE(cond_ptr->result_type(), nullptr);
  EXPECT_TRUE(cond_ptr->result_type()->IsI32());
}

TEST_F(TypeDeterminerTest, Stmt_Else) {
  ast::type::I32Type i32;
  ast::type::F32Type f32;

  auto lhs = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::IntLiteral>(&i32, 2));
  auto lhs_ptr = lhs.get();

  auto rhs = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::FloatLiteral>(&f32, 2.3f));
  auto rhs_ptr = rhs.get();

  ast::StatementList body;
  body.push_back(std::make_unique<ast::AssignmentStatement>(std::move(lhs),
                                                            std::move(rhs)));

  ast::ElseStatement stmt(std::make_unique<ast::ScalarConstructorExpression>(
                              std::make_unique<ast::IntLiteral>(&i32, 3)),
                          std::move(body));

  EXPECT_TRUE(td()->DetermineResultType(&stmt));
  ASSERT_NE(stmt.condition()->result_type(), nullptr);
  ASSERT_NE(lhs_ptr->result_type(), nullptr);
  ASSERT_NE(rhs_ptr->result_type(), nullptr);
  EXPECT_TRUE(stmt.condition()->result_type()->IsI32());
  EXPECT_TRUE(lhs_ptr->result_type()->IsI32());
  EXPECT_TRUE(rhs_ptr->result_type()->IsF32());
}

TEST_F(TypeDeterminerTest, Stmt_If) {
  ast::type::I32Type i32;
  ast::type::F32Type f32;

  auto else_lhs = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::IntLiteral>(&i32, 2));
  auto else_lhs_ptr = else_lhs.get();

  auto else_rhs = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::FloatLiteral>(&f32, 2.3f));
  auto else_rhs_ptr = else_rhs.get();

  ast::StatementList else_body;
  else_body.push_back(std::make_unique<ast::AssignmentStatement>(
      std::move(else_lhs), std::move(else_rhs)));

  auto else_stmt = std::make_unique<ast::ElseStatement>(
      std::make_unique<ast::ScalarConstructorExpression>(
          std::make_unique<ast::IntLiteral>(&i32, 3)),
      std::move(else_body));

  ast::ElseStatementList else_stmts;
  else_stmts.push_back(std::move(else_stmt));

  auto lhs = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::IntLiteral>(&i32, 2));
  auto lhs_ptr = lhs.get();

  auto rhs = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::FloatLiteral>(&f32, 2.3f));
  auto rhs_ptr = rhs.get();

  ast::StatementList body;
  body.push_back(std::make_unique<ast::AssignmentStatement>(std::move(lhs),
                                                            std::move(rhs)));

  ast::IfStatement stmt(std::make_unique<ast::ScalarConstructorExpression>(
                            std::make_unique<ast::IntLiteral>(&i32, 3)),
                        std::move(body));
  stmt.set_else_statements(std::move(else_stmts));

  EXPECT_TRUE(td()->DetermineResultType(&stmt));
  ASSERT_NE(stmt.condition()->result_type(), nullptr);
  ASSERT_NE(else_lhs_ptr->result_type(), nullptr);
  ASSERT_NE(else_rhs_ptr->result_type(), nullptr);
  ASSERT_NE(lhs_ptr->result_type(), nullptr);
  ASSERT_NE(rhs_ptr->result_type(), nullptr);
  EXPECT_TRUE(stmt.condition()->result_type()->IsI32());
  EXPECT_TRUE(else_lhs_ptr->result_type()->IsI32());
  EXPECT_TRUE(else_rhs_ptr->result_type()->IsF32());
  EXPECT_TRUE(lhs_ptr->result_type()->IsI32());
  EXPECT_TRUE(rhs_ptr->result_type()->IsF32());
}

TEST_F(TypeDeterminerTest, Stmt_Loop) {
  ast::type::I32Type i32;
  ast::type::F32Type f32;

  auto body_lhs = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::IntLiteral>(&i32, 2));
  auto body_lhs_ptr = body_lhs.get();

  auto body_rhs = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::FloatLiteral>(&f32, 2.3f));
  auto body_rhs_ptr = body_rhs.get();

  ast::StatementList body;
  body.push_back(std::make_unique<ast::AssignmentStatement>(
      std::move(body_lhs), std::move(body_rhs)));

  auto continuing_lhs = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::IntLiteral>(&i32, 2));
  auto continuing_lhs_ptr = continuing_lhs.get();

  auto continuing_rhs = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::FloatLiteral>(&f32, 2.3f));
  auto continuing_rhs_ptr = continuing_rhs.get();

  ast::StatementList continuing;
  continuing.push_back(std::make_unique<ast::AssignmentStatement>(
      std::move(continuing_lhs), std::move(continuing_rhs)));

  ast::LoopStatement stmt(std::move(body), std::move(continuing));

  EXPECT_TRUE(td()->DetermineResultType(&stmt));
  ASSERT_NE(body_lhs_ptr->result_type(), nullptr);
  ASSERT_NE(body_rhs_ptr->result_type(), nullptr);
  ASSERT_NE(continuing_lhs_ptr->result_type(), nullptr);
  ASSERT_NE(continuing_rhs_ptr->result_type(), nullptr);
  EXPECT_TRUE(body_lhs_ptr->result_type()->IsI32());
  EXPECT_TRUE(body_rhs_ptr->result_type()->IsF32());
  EXPECT_TRUE(continuing_lhs_ptr->result_type()->IsI32());
  EXPECT_TRUE(continuing_rhs_ptr->result_type()->IsF32());
}

TEST_F(TypeDeterminerTest, Stmt_Regardless) {
  ast::type::I32Type i32;
  ast::type::F32Type f32;

  auto lhs = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::IntLiteral>(&i32, 2));
  auto lhs_ptr = lhs.get();

  auto rhs = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::FloatLiteral>(&f32, 2.3f));
  auto rhs_ptr = rhs.get();

  ast::StatementList body;
  body.push_back(std::make_unique<ast::AssignmentStatement>(std::move(lhs),
                                                            std::move(rhs)));

  ast::RegardlessStatement regardless(
      std::make_unique<ast::ScalarConstructorExpression>(
          std::make_unique<ast::IntLiteral>(&i32, 3)),
      std::move(body));

  EXPECT_TRUE(td()->DetermineResultType(&regardless));
  ASSERT_NE(regardless.condition()->result_type(), nullptr);
  ASSERT_NE(lhs_ptr->result_type(), nullptr);
  ASSERT_NE(rhs_ptr->result_type(), nullptr);
  EXPECT_TRUE(regardless.condition()->result_type()->IsI32());
  EXPECT_TRUE(lhs_ptr->result_type()->IsI32());
  EXPECT_TRUE(rhs_ptr->result_type()->IsF32());
}

TEST_F(TypeDeterminerTest, Stmt_Return) {
  ast::type::I32Type i32;

  auto cond = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::IntLiteral>(&i32, 2));
  auto cond_ptr = cond.get();

  ast::ReturnStatement ret(std::move(cond));

  EXPECT_TRUE(td()->DetermineResultType(&ret));
  ASSERT_NE(cond_ptr->result_type(), nullptr);
  EXPECT_TRUE(cond_ptr->result_type()->IsI32());
}

TEST_F(TypeDeterminerTest, Stmt_Switch) {
  ast::type::I32Type i32;
  ast::type::F32Type f32;

  auto lhs = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::IntLiteral>(&i32, 2));
  auto lhs_ptr = lhs.get();

  auto rhs = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::FloatLiteral>(&f32, 2.3f));
  auto rhs_ptr = rhs.get();

  ast::StatementList body;
  body.push_back(std::make_unique<ast::AssignmentStatement>(std::move(lhs),
                                                            std::move(rhs)));

  ast::CaseStatementList cases;
  cases.push_back(std::make_unique<ast::CaseStatement>(
      std::make_unique<ast::IntLiteral>(&i32, 3), std::move(body)));

  ast::SwitchStatement stmt(std::make_unique<ast::ScalarConstructorExpression>(
                                std::make_unique<ast::IntLiteral>(&i32, 2)),
                            std::move(cases));

  EXPECT_TRUE(td()->DetermineResultType(&stmt)) << td()->error();
  ASSERT_NE(stmt.condition()->result_type(), nullptr);
  ASSERT_NE(lhs_ptr->result_type(), nullptr);
  ASSERT_NE(rhs_ptr->result_type(), nullptr);

  EXPECT_TRUE(stmt.condition()->result_type()->IsI32());
  EXPECT_TRUE(lhs_ptr->result_type()->IsI32());
  EXPECT_TRUE(rhs_ptr->result_type()->IsF32());
}

TEST_F(TypeDeterminerTest, Stmt_Unless) {
  ast::type::I32Type i32;
  ast::type::F32Type f32;

  auto lhs = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::IntLiteral>(&i32, 2));
  auto lhs_ptr = lhs.get();

  auto rhs = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::FloatLiteral>(&f32, 2.3f));
  auto rhs_ptr = rhs.get();

  ast::StatementList body;
  body.push_back(std::make_unique<ast::AssignmentStatement>(std::move(lhs),
                                                            std::move(rhs)));

  ast::UnlessStatement unless(
      std::make_unique<ast::ScalarConstructorExpression>(
          std::make_unique<ast::IntLiteral>(&i32, 3)),
      std::move(body));

  EXPECT_TRUE(td()->DetermineResultType(&unless));
  ASSERT_NE(unless.condition()->result_type(), nullptr);
  ASSERT_NE(lhs_ptr->result_type(), nullptr);
  ASSERT_NE(rhs_ptr->result_type(), nullptr);
  EXPECT_TRUE(unless.condition()->result_type()->IsI32());
  EXPECT_TRUE(lhs_ptr->result_type()->IsI32());
  EXPECT_TRUE(rhs_ptr->result_type()->IsF32());
}

TEST_F(TypeDeterminerTest, Stmt_VariableDecl) {
  ast::type::I32Type i32;
  auto var =
      std::make_unique<ast::Variable>("my_var", ast::StorageClass::kNone, &i32);
  var->set_constructor(std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::IntLiteral>(&i32, 2)));
  auto init_ptr = var->constructor();

  ast::VariableDeclStatement decl(std::move(var));

  EXPECT_TRUE(td()->DetermineResultType(&decl));
  ASSERT_NE(init_ptr->result_type(), nullptr);
  EXPECT_TRUE(init_ptr->result_type()->IsI32());
}

TEST_F(TypeDeterminerTest, Expr_ArrayAccessor_Array) {
  ast::type::I32Type i32;
  ast::type::F32Type f32;
  ast::type::ArrayType ary(&f32, 3);

  auto idx = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::IntLiteral>(&i32, 2));

  ast::Module m;
  auto var =
      std::make_unique<ast::Variable>("my_var", ast::StorageClass::kNone, &ary);
  m.AddGlobalVariable(std::move(var));

  // Register the global
  EXPECT_TRUE(td()->Determine(&m));

  ast::ArrayAccessorExpression acc(
      std::make_unique<ast::IdentifierExpression>("my_var"), std::move(idx));
  EXPECT_TRUE(td()->DetermineResultType(&acc));
  ASSERT_NE(acc.result_type(), nullptr);
  EXPECT_TRUE(acc.result_type()->IsF32());
}

TEST_F(TypeDeterminerTest, Expr_ArrayAccessor_Matrix) {
  ast::type::I32Type i32;
  ast::type::F32Type f32;
  ast::type::MatrixType mat(&f32, 3, 2);

  auto idx = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::IntLiteral>(&i32, 2));

  ast::Module m;
  auto var =
      std::make_unique<ast::Variable>("my_var", ast::StorageClass::kNone, &mat);
  m.AddGlobalVariable(std::move(var));

  // Register the global
  EXPECT_TRUE(td()->Determine(&m));

  ast::ArrayAccessorExpression acc(
      std::make_unique<ast::IdentifierExpression>("my_var"), std::move(idx));
  EXPECT_TRUE(td()->DetermineResultType(&acc));
  ASSERT_NE(acc.result_type(), nullptr);
  ASSERT_TRUE(acc.result_type()->IsVector());
  EXPECT_EQ(acc.result_type()->AsVector()->size(), 3);
}

TEST_F(TypeDeterminerTest, Expr_ArrayAccessor_Matrix_BothDimensions) {
  ast::type::I32Type i32;
  ast::type::F32Type f32;
  ast::type::MatrixType mat(&f32, 3, 2);

  auto idx1 = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::IntLiteral>(&i32, 2));
  auto idx2 = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::IntLiteral>(&i32, 1));

  ast::Module m;
  auto var =
      std::make_unique<ast::Variable>("my_var", ast::StorageClass::kNone, &mat);
  m.AddGlobalVariable(std::move(var));

  // Register the global
  EXPECT_TRUE(td()->Determine(&m));

  ast::ArrayAccessorExpression acc(
      std::make_unique<ast::ArrayAccessorExpression>(
          std::make_unique<ast::IdentifierExpression>("my_var"),
          std::move(idx1)),
      std::move(idx2));

  EXPECT_TRUE(td()->DetermineResultType(&acc));
  ASSERT_NE(acc.result_type(), nullptr);
  EXPECT_TRUE(acc.result_type()->IsF32());
}

TEST_F(TypeDeterminerTest, Expr_ArrayAccessor_Vector) {
  ast::type::I32Type i32;
  ast::type::F32Type f32;
  ast::type::VectorType vec(&f32, 3);

  auto idx = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::IntLiteral>(&i32, 2));

  ast::Module m;
  auto var =
      std::make_unique<ast::Variable>("my_var", ast::StorageClass::kNone, &vec);
  m.AddGlobalVariable(std::move(var));

  // Register the global
  EXPECT_TRUE(td()->Determine(&m));

  ast::ArrayAccessorExpression acc(
      std::make_unique<ast::IdentifierExpression>("my_var"), std::move(idx));
  EXPECT_TRUE(td()->DetermineResultType(&acc));
  ASSERT_NE(acc.result_type(), nullptr);
  EXPECT_TRUE(acc.result_type()->IsF32());
}

TEST_F(TypeDeterminerTest, Expr_As) {
  ast::type::F32Type f32;
  ast::AsExpression as(&f32,
                       std::make_unique<ast::IdentifierExpression>("name"));

  EXPECT_TRUE(td()->DetermineResultType(&as));
  ASSERT_NE(as.result_type(), nullptr);
  EXPECT_TRUE(as.result_type()->IsF32());
}

TEST_F(TypeDeterminerTest, Expr_Call) {
  ast::type::F32Type f32;

  ast::VariableList params;
  auto func =
      std::make_unique<ast::Function>("my_func", std::move(params), &f32);
  ast::Module m;
  m.AddFunction(std::move(func));

  // Register the function
  EXPECT_TRUE(td()->Determine(&m));

  ast::ExpressionList call_params;
  ast::CallExpression call(
      std::make_unique<ast::IdentifierExpression>("my_func"),
      std::move(call_params));
  EXPECT_TRUE(td()->DetermineResultType(&call));
  ASSERT_NE(call.result_type(), nullptr);
  EXPECT_TRUE(call.result_type()->IsF32());
}

TEST_F(TypeDeterminerTest, Expr_Cast) {
  ast::type::F32Type f32;
  ast::CastExpression cast(&f32,
                           std::make_unique<ast::IdentifierExpression>("name"));

  EXPECT_TRUE(td()->DetermineResultType(&cast));
  ASSERT_NE(cast.result_type(), nullptr);
  EXPECT_TRUE(cast.result_type()->IsF32());
}

TEST_F(TypeDeterminerTest, Expr_Constructor_Scalar) {
  ast::type::F32Type f32;
  ast::ScalarConstructorExpression s(
      std::make_unique<ast::FloatLiteral>(&f32, 1.0f));

  EXPECT_TRUE(td()->DetermineResultType(&s));
  ASSERT_NE(s.result_type(), nullptr);
  EXPECT_TRUE(s.result_type()->IsF32());
}

TEST_F(TypeDeterminerTest, Expr_Constructor_Type) {
  ast::type::F32Type f32;
  ast::type::VectorType vec(&f32, 3);

  ast::ExpressionList vals;
  vals.push_back(std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::FloatLiteral>(&f32, 1.0f)));
  vals.push_back(std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::FloatLiteral>(&f32, 1.0f)));
  vals.push_back(std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::FloatLiteral>(&f32, 3.0f)));

  ast::TypeConstructorExpression tc(&vec, std::move(vals));

  EXPECT_TRUE(td()->DetermineResultType(&tc));
  ASSERT_NE(tc.result_type(), nullptr);
  ASSERT_TRUE(tc.result_type()->IsVector());
  EXPECT_TRUE(tc.result_type()->AsVector()->type()->IsF32());
  EXPECT_EQ(tc.result_type()->AsVector()->size(), 3);
}

TEST_F(TypeDeterminerTest, Expr_Identifier_GlobalVariable) {
  ast::type::F32Type f32;

  ast::Module m;
  auto var =
      std::make_unique<ast::Variable>("my_var", ast::StorageClass::kNone, &f32);
  m.AddGlobalVariable(std::move(var));

  // Register the global
  EXPECT_TRUE(td()->Determine(&m));

  ast::IdentifierExpression ident("my_var");
  EXPECT_TRUE(td()->DetermineResultType(&ident));
  ASSERT_NE(ident.result_type(), nullptr);
  EXPECT_TRUE(ident.result_type()->IsF32());
}

TEST_F(TypeDeterminerTest, Expr_Identifier_FunctionVariable) {
  ast::type::F32Type f32;

  auto my_var = std::make_unique<ast::IdentifierExpression>("my_var");
  auto my_var_ptr = my_var.get();

  ast::StatementList body;
  body.push_back(std::make_unique<ast::VariableDeclStatement>(
      std::make_unique<ast::Variable>("my_var", ast::StorageClass::kNone,
                                      &f32)));

  body.push_back(std::make_unique<ast::AssignmentStatement>(
      std::move(my_var),
      std::make_unique<ast::IdentifierExpression>("my_var")));

  ast::Function f("my_func", {}, &f32);
  f.set_body(std::move(body));

  EXPECT_TRUE(td()->DetermineFunction(&f));

  ASSERT_NE(my_var_ptr->result_type(), nullptr);
  EXPECT_TRUE(my_var_ptr->result_type()->IsF32());
}

TEST_F(TypeDeterminerTest, Expr_Identifier_Function) {
  ast::type::F32Type f32;

  ast::VariableList params;
  auto func =
      std::make_unique<ast::Function>("my_func", std::move(params), &f32);
  ast::Module m;
  m.AddFunction(std::move(func));

  // Register the function
  EXPECT_TRUE(td()->Determine(&m));

  ast::IdentifierExpression ident("my_func");
  EXPECT_TRUE(td()->DetermineResultType(&ident));
  ASSERT_NE(ident.result_type(), nullptr);
  EXPECT_TRUE(ident.result_type()->IsF32());
}

TEST_F(TypeDeterminerTest, Expr_MemberAccessor_Struct) {
  ast::type::I32Type i32;
  ast::type::F32Type f32;

  ast::StructMemberDecorationList decos;
  ast::StructMemberList members;
  members.push_back(std::make_unique<ast::StructMember>("first_member", &i32,
                                                        std::move(decos)));
  members.push_back(std::make_unique<ast::StructMember>("second_member", &f32,
                                                        std::move(decos)));

  auto strct = std::make_unique<ast::Struct>(ast::StructDecoration::kNone,
                                             std::move(members));

  ast::type::StructType st(std::move(strct));

  auto var = std::make_unique<ast::Variable>("my_struct",
                                             ast::StorageClass::kNone, &st);

  ast::Module m;
  m.AddGlobalVariable(std::move(var));

  // Register the global
  EXPECT_TRUE(td()->Determine(&m));

  auto ident = std::make_unique<ast::IdentifierExpression>("my_struct");
  auto mem_ident = std::make_unique<ast::IdentifierExpression>("second_member");

  ast::MemberAccessorExpression mem(std::move(ident), std::move(mem_ident));
  EXPECT_TRUE(td()->DetermineResultType(&mem));
  ASSERT_NE(mem.result_type(), nullptr);
  EXPECT_TRUE(mem.result_type()->IsF32());
}

TEST_F(TypeDeterminerTest, Expr_MemberAccessor_VectorSwizzle) {
  ast::type::F32Type f32;
  ast::type::VectorType vec3(&f32, 3);

  auto var = std::make_unique<ast::Variable>("my_vec", ast::StorageClass::kNone,
                                             &vec3);
  ast::Module m;
  m.AddGlobalVariable(std::move(var));

  // Register the global
  EXPECT_TRUE(td()->Determine(&m));

  auto ident = std::make_unique<ast::IdentifierExpression>("my_vec");
  auto swizzle = std::make_unique<ast::IdentifierExpression>("xy");

  ast::MemberAccessorExpression mem(std::move(ident), std::move(swizzle));
  EXPECT_TRUE(td()->DetermineResultType(&mem)) << td()->error();
  ASSERT_NE(mem.result_type(), nullptr);
  ASSERT_TRUE(mem.result_type()->IsVector());
  EXPECT_TRUE(mem.result_type()->AsVector()->type()->IsF32());
  EXPECT_EQ(mem.result_type()->AsVector()->size(), 2);
}

TEST_F(TypeDeterminerTest, Expr_MultiLevel) {
  // struct b {
  //   vec4<f32> foo
  // }
  // struct A {
  //   vec3<struct b> mem
  // }
  // var c : A
  // c.mem[0].foo.yx
  //   -> vec2<f32>
  //
  // MemberAccessor{
  //   MemberAccessor{
  //     ArrayAccessor{
  //       MemberAccessor{
  //         Identifier{c}
  //         Identifier{mem}
  //       }
  //       ScalarConstructor{0}
  //     }
  //     Identifier{foo}
  //   }
  //   Identifier{yx}
  // }
  //
  ast::type::I32Type i32;
  ast::type::F32Type f32;

  ast::type::VectorType vec4(&f32, 4);

  ast::StructMemberDecorationList decos;
  ast::StructMemberList b_members;
  b_members.push_back(
      std::make_unique<ast::StructMember>("foo", &vec4, std::move(decos)));

  auto strctB = std::make_unique<ast::Struct>(ast::StructDecoration::kNone,
                                              std::move(b_members));
  ast::type::StructType stB(std::move(strctB));

  ast::type::VectorType vecB(&stB, 3);

  ast::StructMemberList a_members;
  a_members.push_back(
      std::make_unique<ast::StructMember>("mem", &vecB, std::move(decos)));

  auto strctA = std::make_unique<ast::Struct>(ast::StructDecoration::kNone,
                                              std::move(a_members));

  ast::type::StructType stA(std::move(strctA));

  auto var =
      std::make_unique<ast::Variable>("c", ast::StorageClass::kNone, &stA);

  ast::Module m;
  m.AddGlobalVariable(std::move(var));

  // Register the global
  EXPECT_TRUE(td()->Determine(&m));

  auto ident = std::make_unique<ast::IdentifierExpression>("c");
  auto mem_ident = std::make_unique<ast::IdentifierExpression>("mem");
  auto foo_ident = std::make_unique<ast::IdentifierExpression>("foo");
  auto idx = std::make_unique<ast::ScalarConstructorExpression>(
      std::make_unique<ast::IntLiteral>(&i32, 0));
  auto swizzle = std::make_unique<ast::IdentifierExpression>("yx");

  ast::MemberAccessorExpression mem(
      std::make_unique<ast::MemberAccessorExpression>(
          std::make_unique<ast::ArrayAccessorExpression>(
              std::make_unique<ast::MemberAccessorExpression>(
                  std::move(ident), std::move(mem_ident)),
              std::move(idx)),
          std::move(foo_ident)),
      std::move(swizzle));
  EXPECT_TRUE(td()->DetermineResultType(&mem)) << td()->error();
  ASSERT_NE(mem.result_type(), nullptr);
  ASSERT_TRUE(mem.result_type()->IsVector());
  EXPECT_TRUE(mem.result_type()->AsVector()->type()->IsF32());
  EXPECT_EQ(mem.result_type()->AsVector()->size(), 2);
}

}  // namespace
}  // namespace tint