// 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 <memory>

#include "gtest/gtest.h"
#include "src/ast/call_expression.h"
#include "src/ast/call_statement.h"
#include "src/ast/function.h"
#include "src/ast/identifier_expression.h"
#include "src/ast/module.h"
#include "src/ast/type/void_type.h"
#include "src/writer/msl/generator_impl.h"
#include "src/writer/msl/test_helper.h"

namespace tint {
namespace writer {
namespace msl {
namespace {

using MslGeneratorImplTest = TestHelper;

TEST_F(MslGeneratorImplTest, EmitExpression_Call_WithoutParams) {
  ast::type::Void void_type;

  auto* id = create<ast::IdentifierExpression>(
      Source{}, mod.RegisterSymbol("my_func"), "my_func");
  ast::CallExpression call(Source{}, id, {});

  auto* func = create<ast::Function>(Source{}, mod.RegisterSymbol("my_func"),
                                     "my_func", ast::VariableList{}, &void_type,
                                     create<ast::BlockStatement>(Source{}),
                                     ast::FunctionDecorationList{});
  mod.AddFunction(func);

  ASSERT_TRUE(gen.EmitExpression(&call)) << gen.error();
  EXPECT_EQ(gen.result(), "my_func()");
}

TEST_F(MslGeneratorImplTest, EmitExpression_Call_WithParams) {
  ast::type::Void void_type;

  auto* id = create<ast::IdentifierExpression>(
      Source{}, mod.RegisterSymbol("my_func"), "my_func");
  ast::ExpressionList params;
  params.push_back(create<ast::IdentifierExpression>(
      Source{}, mod.RegisterSymbol("param1"), "param1"));
  params.push_back(create<ast::IdentifierExpression>(
      Source{}, mod.RegisterSymbol("param2"), "param2"));
  ast::CallExpression call(Source{}, id, params);

  auto* func = create<ast::Function>(Source{}, mod.RegisterSymbol("my_func"),
                                     "my_func", ast::VariableList{}, &void_type,
                                     create<ast::BlockStatement>(Source{}),
                                     ast::FunctionDecorationList{});
  mod.AddFunction(func);

  ASSERT_TRUE(gen.EmitExpression(&call)) << gen.error();
  EXPECT_EQ(gen.result(), "my_func(param1, param2)");
}

TEST_F(MslGeneratorImplTest, EmitStatement_Call) {
  ast::type::Void void_type;

  auto* id = create<ast::IdentifierExpression>(
      Source{}, mod.RegisterSymbol("my_func"), "my_func");
  ast::ExpressionList params;
  params.push_back(create<ast::IdentifierExpression>(
      Source{}, mod.RegisterSymbol("param1"), "param1"));
  params.push_back(create<ast::IdentifierExpression>(
      Source{}, mod.RegisterSymbol("param2"), "param2"));
  ast::CallStatement call(Source{},
                          create<ast::CallExpression>(Source{}, id, params));

  auto* func = create<ast::Function>(Source{}, mod.RegisterSymbol("my_func"),
                                     "my_func", ast::VariableList{}, &void_type,
                                     create<ast::BlockStatement>(Source{}),
                                     ast::FunctionDecorationList{});
  mod.AddFunction(func);

  gen.increment_indent();
  ASSERT_TRUE(gen.EmitStatement(&call)) << gen.error();
  EXPECT_EQ(gen.result(), "  my_func(param1, param2);\n");
}

}  // namespace
}  // namespace msl
}  // namespace writer
}  // namespace tint