// 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 <string>

#include "gmock/gmock.h"
#include "src/reader/spirv/parser_impl.h"
#include "src/reader/spirv/parser_impl_test_helper.h"
#include "src/reader/spirv/spirv_tools_helpers_test.h"

namespace tint {
namespace reader {
namespace spirv {
namespace {

using ::testing::HasSubstr;
using ::testing::Not;

TEST_F(SpvParserTest, ModuleScopeVar_NoVar) {
  auto p = parser(test::Assemble(""));
  EXPECT_TRUE(p->BuildAndParseInternalModule());
  EXPECT_TRUE(p->error().empty());
  const auto module_ast = p->module().to_str();
  EXPECT_THAT(module_ast, Not(HasSubstr("Variable")));
}

TEST_F(SpvParserTest, ModuleScopeVar_BadStorageClass) {
  auto p = parser(test::Assemble(R"(
    %float = OpTypeFloat 32
    %ptr = OpTypePointer CrossWorkgroup %float
    %52 = OpVariable %ptr CrossWorkgroup
  )"));
  EXPECT_TRUE(p->BuildInternalModule());
  // Normally we should run ParserImpl::RegisterTypes before emitting
  // variables. But defensive coding in EmitModuleScopeVariables lets
  // us catch this error.
  EXPECT_FALSE(p->EmitModuleScopeVariables()) << p->error();
  EXPECT_THAT(p->error(), HasSubstr("unknown SPIR-V storage class: 5"));
}

TEST_F(SpvParserTest, ModuleScopeVar_BadPointerType) {
  auto p = parser(test::Assemble(R"(
    %float = OpTypeFloat 32
    %fn_ty = OpTypeFunction %float
    %3 = OpTypePointer Private %fn_ty
    %52 = OpVariable %3 Private
  )"));
  EXPECT_TRUE(p->BuildInternalModule());
  // Normally we should run ParserImpl::RegisterTypes before emitting
  // variables. But defensive coding in EmitModuleScopeVariables lets
  // us catch this error.
  EXPECT_FALSE(p->EmitModuleScopeVariables());
  EXPECT_THAT(p->error(), HasSubstr("internal error: failed to register Tint "
                                    "AST type for SPIR-V type with ID: 3"));
}

TEST_F(SpvParserTest, ModuleScopeVar_AnonWorkgroupVar) {
  auto p = parser(test::Assemble(R"(
    %float = OpTypeFloat 32
    %ptr = OpTypePointer Workgroup %float
    %52 = OpVariable %ptr Workgroup
  )"));

  EXPECT_TRUE(p->BuildAndParseInternalModule());
  EXPECT_TRUE(p->error().empty());
  const auto module_str = p->module().to_str();
  EXPECT_THAT(module_str, HasSubstr(R"(
  Variable{
    x_52
    workgroup
    __f32
  })"));
}

TEST_F(SpvParserTest, ModuleScopeVar_NamedWorkgroupVar) {
  auto p = parser(test::Assemble(R"(
    OpName %52 "the_counter"
    %float = OpTypeFloat 32
    %ptr = OpTypePointer Workgroup %float
    %52 = OpVariable %ptr Workgroup
  )"));

  EXPECT_TRUE(p->BuildAndParseInternalModule());
  EXPECT_TRUE(p->error().empty());
  const auto module_str = p->module().to_str();
  EXPECT_THAT(module_str, HasSubstr(R"(
  Variable{
    the_counter
    workgroup
    __f32
  })"));
}

TEST_F(SpvParserTest, ModuleScopeVar_PrivateVar) {
  auto p = parser(test::Assemble(R"(
    OpName %52 "my_own_private_idaho"
    %float = OpTypeFloat 32
    %ptr = OpTypePointer Private %float
    %52 = OpVariable %ptr Private
  )"));

  EXPECT_TRUE(p->BuildAndParseInternalModule());
  EXPECT_TRUE(p->error().empty());
  const auto module_str = p->module().to_str();
  EXPECT_THAT(module_str, HasSubstr(R"(
  Variable{
    my_own_private_idaho
    private
    __f32
  })"));
}

TEST_F(SpvParserTest, ModuleScopeVar_BuiltinVerteIndex) {
  auto p = parser(test::Assemble(R"(
    OpDecorate %52 BuiltIn VertexIndex
    %uint = OpTypeInt 32 0
    %ptr = OpTypePointer Input %uint
    %52 = OpVariable %ptr Input
  )"));

  EXPECT_TRUE(p->BuildAndParseInternalModule());
  EXPECT_TRUE(p->error().empty());
  const auto module_str = p->module().to_str();
  EXPECT_THAT(module_str, HasSubstr(R"(
  DecoratedVariable{
    Decorations{
      BuiltinDecoration{vertex_idx}
    }
    x_52
    in
    __u32
  })"));
}

}  // namespace
}  // namespace spirv
}  // namespace reader
}  // namespace tint