// 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 "gtest/gtest-spi.h"

#include "src/tint/ast/id_attribute.h"
#include "src/tint/ast/test_helper.h"

namespace tint {
namespace ast {
namespace {

using VariableTest = TestHelper;

TEST_F(VariableTest, Creation) {
  auto* v = Var("my_var", ty.i32(), StorageClass::kFunction);

  EXPECT_EQ(v->symbol, Symbol(1, ID()));
  EXPECT_EQ(v->declared_storage_class, StorageClass::kFunction);
  EXPECT_TRUE(v->type->Is<ast::I32>());
  EXPECT_EQ(v->source.range.begin.line, 0u);
  EXPECT_EQ(v->source.range.begin.column, 0u);
  EXPECT_EQ(v->source.range.end.line, 0u);
  EXPECT_EQ(v->source.range.end.column, 0u);
}

TEST_F(VariableTest, CreationWithSource) {
  auto* v = Var(
      Source{Source::Range{Source::Location{27, 4}, Source::Location{27, 5}}},
      "i", ty.f32(), StorageClass::kPrivate, nullptr, AttributeList{});

  EXPECT_EQ(v->symbol, Symbol(1, ID()));
  EXPECT_EQ(v->declared_storage_class, StorageClass::kPrivate);
  EXPECT_TRUE(v->type->Is<ast::F32>());
  EXPECT_EQ(v->source.range.begin.line, 27u);
  EXPECT_EQ(v->source.range.begin.column, 4u);
  EXPECT_EQ(v->source.range.end.line, 27u);
  EXPECT_EQ(v->source.range.end.column, 5u);
}

TEST_F(VariableTest, CreationEmpty) {
  auto* v = Var(
      Source{Source::Range{Source::Location{27, 4}, Source::Location{27, 7}}},
      "a_var", ty.i32(), StorageClass::kWorkgroup, nullptr, AttributeList{});

  EXPECT_EQ(v->symbol, Symbol(1, ID()));
  EXPECT_EQ(v->declared_storage_class, StorageClass::kWorkgroup);
  EXPECT_TRUE(v->type->Is<ast::I32>());
  EXPECT_EQ(v->source.range.begin.line, 27u);
  EXPECT_EQ(v->source.range.begin.column, 4u);
  EXPECT_EQ(v->source.range.end.line, 27u);
  EXPECT_EQ(v->source.range.end.column, 7u);
}

TEST_F(VariableTest, Assert_MissingSymbol) {
  EXPECT_FATAL_FAILURE(
      {
        ProgramBuilder b;
        b.Var("", b.ty.i32(), StorageClass::kNone);
      },
      "internal compiler error");
}

TEST_F(VariableTest, Assert_DifferentProgramID_Symbol) {
  EXPECT_FATAL_FAILURE(
      {
        ProgramBuilder b1;
        ProgramBuilder b2;
        b1.Var(b2.Sym("x"), b1.ty.f32(), StorageClass::kNone);
      },
      "internal compiler error");
}

TEST_F(VariableTest, Assert_DifferentProgramID_Constructor) {
  EXPECT_FATAL_FAILURE(
      {
        ProgramBuilder b1;
        ProgramBuilder b2;
        b1.Var("x", b1.ty.f32(), StorageClass::kNone, b2.Expr(1.2f));
      },
      "internal compiler error");
}

TEST_F(VariableTest, WithAttributes) {
  auto* var = Var("my_var", ty.i32(), StorageClass::kFunction, nullptr,
                  AttributeList{
                      create<LocationAttribute>(1),
                      create<BuiltinAttribute>(Builtin::kPosition),
                      create<IdAttribute>(1200),
                  });

  auto& attributes = var->attributes;
  EXPECT_TRUE(ast::HasAttribute<ast::LocationAttribute>(attributes));
  EXPECT_TRUE(ast::HasAttribute<ast::BuiltinAttribute>(attributes));
  EXPECT_TRUE(ast::HasAttribute<ast::IdAttribute>(attributes));

  auto* location = ast::GetAttribute<ast::LocationAttribute>(attributes);
  ASSERT_NE(nullptr, location);
  EXPECT_EQ(1u, location->value);
}

TEST_F(VariableTest, BindingPoint) {
  auto* var = Var("my_var", ty.i32(), StorageClass::kFunction, nullptr,
                  AttributeList{
                      create<BindingAttribute>(2),
                      create<GroupAttribute>(1),
                  });
  EXPECT_TRUE(var->BindingPoint());
  ASSERT_NE(var->BindingPoint().binding, nullptr);
  ASSERT_NE(var->BindingPoint().group, nullptr);
  EXPECT_EQ(var->BindingPoint().binding->value, 2u);
  EXPECT_EQ(var->BindingPoint().group->value, 1u);
}

TEST_F(VariableTest, BindingPointAttributes) {
  auto* var = Var("my_var", ty.i32(), StorageClass::kFunction, nullptr,
                  AttributeList{});
  EXPECT_FALSE(var->BindingPoint());
  EXPECT_EQ(var->BindingPoint().group, nullptr);
  EXPECT_EQ(var->BindingPoint().binding, nullptr);
}

TEST_F(VariableTest, BindingPointMissingGroupAttribute) {
  auto* var = Var("my_var", ty.i32(), StorageClass::kFunction, nullptr,
                  AttributeList{
                      create<BindingAttribute>(2),
                  });
  EXPECT_FALSE(var->BindingPoint());
  ASSERT_NE(var->BindingPoint().binding, nullptr);
  EXPECT_EQ(var->BindingPoint().binding->value, 2u);
  EXPECT_EQ(var->BindingPoint().group, nullptr);
}

TEST_F(VariableTest, BindingPointMissingBindingAttribute) {
  auto* var = Var("my_var", ty.i32(), StorageClass::kFunction, nullptr,
                  AttributeList{create<GroupAttribute>(1)});
  EXPECT_FALSE(var->BindingPoint());
  ASSERT_NE(var->BindingPoint().group, nullptr);
  EXPECT_EQ(var->BindingPoint().group->value, 1u);
  EXPECT_EQ(var->BindingPoint().binding, nullptr);
}

}  // namespace
}  // namespace ast
}  // namespace tint