// 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.h"
#include "src/ast/binding_decoration.h"
#include "src/ast/builtin_decoration.h"
#include "src/ast/location_decoration.h"
#include "src/ast/set_decoration.h"
#include "src/reader/wgsl/parser_impl.h"
#include "src/reader/wgsl/parser_impl_test_helper.h"

namespace tint {
namespace reader {
namespace wgsl {
namespace {

TEST_F(ParserImplTest, VariableDecoration_Location) {
  auto p = parser("location(4)");
  auto deco = p->decoration();
  EXPECT_TRUE(deco.matched);
  EXPECT_FALSE(deco.errored);
  ASSERT_NE(deco.value, nullptr);
  auto* var_deco = deco.value->As<ast::VariableDecoration>();
  ASSERT_NE(var_deco, nullptr);
  ASSERT_FALSE(p->has_error());
  ASSERT_TRUE(var_deco->Is<ast::LocationDecoration>());

  auto* loc = var_deco->As<ast::LocationDecoration>();
  EXPECT_EQ(loc->value(), 4u);
}

TEST_F(ParserImplTest, VariableDecoration_Location_MissingLeftParen) {
  auto p = parser("location 4)");
  auto deco = p->decoration();
  EXPECT_FALSE(deco.matched);
  EXPECT_TRUE(deco.errored);
  EXPECT_EQ(deco.value, nullptr);
  EXPECT_TRUE(p->has_error());
  EXPECT_EQ(p->error(), "1:10: expected '(' for location decoration");
}

TEST_F(ParserImplTest, VariableDecoration_Location_MissingRightParen) {
  auto p = parser("location(4");
  auto deco = p->decoration();
  EXPECT_FALSE(deco.matched);
  EXPECT_TRUE(deco.errored);
  EXPECT_EQ(deco.value, nullptr);
  EXPECT_TRUE(p->has_error());
  EXPECT_EQ(p->error(), "1:11: expected ')' for location decoration");
}

TEST_F(ParserImplTest, VariableDecoration_Location_MissingValue) {
  auto p = parser("location()");
  auto deco = p->decoration();
  EXPECT_FALSE(deco.matched);
  EXPECT_TRUE(deco.errored);
  EXPECT_EQ(deco.value, nullptr);
  EXPECT_TRUE(p->has_error());
  EXPECT_EQ(p->error(),
            "1:10: expected signed integer literal for location decoration");
}

TEST_F(ParserImplTest, VariableDecoration_Location_MissingInvalid) {
  auto p = parser("location(nan)");
  auto deco = p->decoration();
  EXPECT_FALSE(deco.matched);
  EXPECT_TRUE(deco.errored);
  EXPECT_EQ(deco.value, nullptr);
  EXPECT_TRUE(p->has_error());
  EXPECT_EQ(p->error(),
            "1:10: expected signed integer literal for location decoration");
}

struct BuiltinData {
  const char* input;
  ast::Builtin result;
};
inline std::ostream& operator<<(std::ostream& out, BuiltinData data) {
  out << std::string(data.input);
  return out;
}

class BuiltinTest : public ParserImplTestWithParam<BuiltinData> {};

TEST_P(BuiltinTest, VariableDecoration_Builtin) {
  auto params = GetParam();
  auto p = parser(std::string("builtin(") + params.input + ")");

  auto deco = p->decoration();
  EXPECT_TRUE(deco.matched);
  EXPECT_FALSE(deco.errored);
  ASSERT_NE(deco.value, nullptr);
  auto* var_deco = deco.value->As<ast::VariableDecoration>();
  ASSERT_FALSE(p->has_error()) << p->error();
  ASSERT_NE(var_deco, nullptr);
  ASSERT_TRUE(var_deco->Is<ast::BuiltinDecoration>());

  auto* builtin = var_deco->As<ast::BuiltinDecoration>();
  EXPECT_EQ(builtin->value(), params.result);
}
INSTANTIATE_TEST_SUITE_P(
    ParserImplTest,
    BuiltinTest,
    testing::Values(
        BuiltinData{"position", ast::Builtin::kPosition},
        BuiltinData{"vertex_idx", ast::Builtin::kVertexIdx},
        BuiltinData{"instance_idx", ast::Builtin::kInstanceIdx},
        BuiltinData{"front_facing", ast::Builtin::kFrontFacing},
        BuiltinData{"frag_coord", ast::Builtin::kFragCoord},
        BuiltinData{"frag_depth", ast::Builtin::kFragDepth},
        BuiltinData{"local_invocation_id", ast::Builtin::kLocalInvocationId},
        BuiltinData{"local_invocation_idx", ast::Builtin::kLocalInvocationIdx},
        BuiltinData{"global_invocation_id",
                    ast::Builtin::kGlobalInvocationId}));

TEST_F(ParserImplTest, VariableDecoration_Builtin_MissingLeftParen) {
  auto p = parser("builtin position)");
  auto deco = p->decoration();
  EXPECT_FALSE(deco.matched);
  EXPECT_TRUE(deco.errored);
  EXPECT_EQ(deco.value, nullptr);
  EXPECT_TRUE(p->has_error());
  EXPECT_EQ(p->error(), "1:9: expected '(' for builtin decoration");
}

TEST_F(ParserImplTest, VariableDecoration_Builtin_MissingRightParen) {
  auto p = parser("builtin(position");
  auto deco = p->decoration();
  EXPECT_FALSE(deco.matched);
  EXPECT_TRUE(deco.errored);
  EXPECT_EQ(deco.value, nullptr);
  EXPECT_TRUE(p->has_error());
  EXPECT_EQ(p->error(), "1:17: expected ')' for builtin decoration");
}

TEST_F(ParserImplTest, VariableDecoration_Builtin_MissingValue) {
  auto p = parser("builtin()");
  auto deco = p->decoration();
  EXPECT_FALSE(deco.matched);
  EXPECT_TRUE(deco.errored);
  EXPECT_EQ(deco.value, nullptr);
  EXPECT_TRUE(p->has_error());
  EXPECT_EQ(p->error(), "1:9: expected identifier for builtin");
}

TEST_F(ParserImplTest, VariableDecoration_Builtin_InvalidValue) {
  auto p = parser("builtin(other_thingy)");
  auto deco = p->decoration();
  EXPECT_FALSE(deco.matched);
  EXPECT_TRUE(deco.errored);
  EXPECT_EQ(deco.value, nullptr);
  EXPECT_TRUE(p->has_error());
  EXPECT_EQ(p->error(), "1:9: invalid value for builtin decoration");
}

TEST_F(ParserImplTest, VariableDecoration_Builtin_MissingInvalid) {
  auto p = parser("builtin(3)");
  auto deco = p->decoration();
  EXPECT_FALSE(deco.matched);
  EXPECT_TRUE(deco.errored);
  EXPECT_EQ(deco.value, nullptr);
  EXPECT_TRUE(p->has_error());
  EXPECT_EQ(p->error(), "1:9: expected identifier for builtin");
}

TEST_F(ParserImplTest, VariableDecoration_Binding) {
  auto p = parser("binding(4)");
  auto deco = p->decoration();
  EXPECT_TRUE(deco.matched);
  EXPECT_FALSE(deco.errored);
  ASSERT_NE(deco.value, nullptr);
  auto* var_deco = deco.value->As<ast::VariableDecoration>();
  ASSERT_NE(var_deco, nullptr);
  ASSERT_FALSE(p->has_error());
  ASSERT_TRUE(var_deco->Is<ast::BindingDecoration>());

  auto* binding = var_deco->As<ast::BindingDecoration>();
  EXPECT_EQ(binding->value(), 4u);
}

TEST_F(ParserImplTest, VariableDecoration_Binding_MissingLeftParen) {
  auto p = parser("binding 4)");
  auto deco = p->decoration();
  EXPECT_FALSE(deco.matched);
  EXPECT_TRUE(deco.errored);
  EXPECT_EQ(deco.value, nullptr);
  EXPECT_TRUE(p->has_error());
  EXPECT_EQ(p->error(), "1:9: expected '(' for binding decoration");
}

TEST_F(ParserImplTest, VariableDecoration_Binding_MissingRightParen) {
  auto p = parser("binding(4");
  auto deco = p->decoration();
  EXPECT_FALSE(deco.matched);
  EXPECT_TRUE(deco.errored);
  EXPECT_EQ(deco.value, nullptr);
  EXPECT_TRUE(p->has_error());
  EXPECT_EQ(p->error(), "1:10: expected ')' for binding decoration");
}

TEST_F(ParserImplTest, VariableDecoration_Binding_MissingValue) {
  auto p = parser("binding()");
  auto deco = p->decoration();
  EXPECT_FALSE(deco.matched);
  EXPECT_TRUE(deco.errored);
  EXPECT_EQ(deco.value, nullptr);
  EXPECT_TRUE(p->has_error());
  EXPECT_EQ(p->error(),
            "1:9: expected signed integer literal for binding decoration");
}

TEST_F(ParserImplTest, VariableDecoration_Binding_MissingInvalid) {
  auto p = parser("binding(nan)");
  auto deco = p->decoration();
  EXPECT_FALSE(deco.matched);
  EXPECT_TRUE(deco.errored);
  EXPECT_EQ(deco.value, nullptr);
  EXPECT_TRUE(p->has_error());
  EXPECT_EQ(p->error(),
            "1:9: expected signed integer literal for binding decoration");
}

TEST_F(ParserImplTest, VariableDecoration_set) {
  auto p = parser("set(4)");
  auto deco = p->decoration();
  EXPECT_TRUE(deco.matched);
  EXPECT_FALSE(deco.errored);
  ASSERT_NE(deco.value, nullptr);
  auto* var_deco = deco.value->As<ast::VariableDecoration>();
  ASSERT_FALSE(p->has_error());
  ASSERT_NE(var_deco, nullptr);
  ASSERT_TRUE(var_deco->Is<ast::SetDecoration>());

  auto* set = var_deco->As<ast::SetDecoration>();
  EXPECT_EQ(set->value(), 4u);
}

TEST_F(ParserImplTest, VariableDecoration_Set_MissingLeftParen) {
  auto p = parser("set 2)");
  auto deco = p->decoration();
  EXPECT_FALSE(deco.matched);
  EXPECT_TRUE(deco.errored);
  EXPECT_EQ(deco.value, nullptr);
  EXPECT_TRUE(p->has_error());
  EXPECT_EQ(p->error(), "1:5: expected '(' for set decoration");
}

TEST_F(ParserImplTest, VariableDecoration_Set_MissingRightParen) {
  auto p = parser("set(2");
  auto deco = p->decoration();
  EXPECT_FALSE(deco.matched);
  EXPECT_TRUE(deco.errored);
  EXPECT_EQ(deco.value, nullptr);
  EXPECT_TRUE(p->has_error());
  EXPECT_EQ(p->error(), "1:6: expected ')' for set decoration");
}

TEST_F(ParserImplTest, VariableDecoration_Set_MissingValue) {
  auto p = parser("set()");
  auto deco = p->decoration();
  EXPECT_FALSE(deco.matched);
  EXPECT_TRUE(deco.errored);
  EXPECT_EQ(deco.value, nullptr);
  EXPECT_TRUE(p->has_error());
  EXPECT_EQ(p->error(),
            "1:5: expected signed integer literal for set decoration");
}

TEST_F(ParserImplTest, VariableDecoration_Set_MissingInvalid) {
  auto p = parser("set(nan)");
  auto deco = p->decoration();
  EXPECT_FALSE(deco.matched);
  EXPECT_TRUE(deco.errored);
  EXPECT_EQ(deco.value, nullptr);
  EXPECT_TRUE(p->has_error());
  EXPECT_EQ(p->error(),
            "1:5: expected signed integer literal for set decoration");
}

}  // namespace
}  // namespace wgsl
}  // namespace reader
}  // namespace tint