// 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/case_statement.h"
#include "src/ast/switch_statement.h"
#include "src/reader/wgsl/parser_impl.h"

namespace tint {
namespace reader {
namespace wgsl {

using ParserImplTest = testing::Test;

TEST_F(ParserImplTest, SwitchStmt_WithoutDefault) {
  ParserImpl p{R"(switch(a) {
  case 1: {}
  case 2: {}
})"};
  auto e = p.switch_stmt();
  ASSERT_FALSE(p.has_error()) << p.error();
  ASSERT_NE(e, nullptr);
  ASSERT_TRUE(e->IsSwitch());
  ASSERT_EQ(e->body().size(), 2);
  EXPECT_FALSE(e->body()[0]->IsDefault());
  EXPECT_FALSE(e->body()[1]->IsDefault());
}

TEST_F(ParserImplTest, SwitchStmt_Empty) {
  ParserImpl p{"switch(a) { }"};
  auto e = p.switch_stmt();
  ASSERT_FALSE(p.has_error()) << p.error();
  ASSERT_NE(e, nullptr);
  ASSERT_TRUE(e->IsSwitch());
  ASSERT_EQ(e->body().size(), 0);
}

TEST_F(ParserImplTest, SwitchStmt_DefaultInMiddle) {
  ParserImpl p{R"(switch(a) {
  case 1: {}
  default: {}
  case 2: {}
})"};
  auto e = p.switch_stmt();
  ASSERT_FALSE(p.has_error()) << p.error();
  ASSERT_NE(e, nullptr);
  ASSERT_TRUE(e->IsSwitch());

  ASSERT_EQ(e->body().size(), 3);
  ASSERT_FALSE(e->body()[0]->IsDefault());
  ASSERT_TRUE(e->body()[1]->IsDefault());
  ASSERT_FALSE(e->body()[2]->IsDefault());
}

TEST_F(ParserImplTest, SwitchStmt_InvalidExpression) {
  ParserImpl p{"switch(a=b) {}"};
  auto e = p.switch_stmt();
  ASSERT_TRUE(p.has_error());
  ASSERT_EQ(e, nullptr);
  EXPECT_EQ(p.error(), "1:9: expected )");
}

TEST_F(ParserImplTest, SwitchStmt_MissingExpression) {
  ParserImpl p{"switch {}"};
  auto e = p.switch_stmt();
  ASSERT_TRUE(p.has_error());
  ASSERT_EQ(e, nullptr);
  EXPECT_EQ(p.error(), "1:8: expected (");
}

TEST_F(ParserImplTest, SwitchStmt_MissingBracketLeft) {
  ParserImpl p{"switch(a) }"};
  auto e = p.switch_stmt();
  ASSERT_TRUE(p.has_error());
  ASSERT_EQ(e, nullptr);
  EXPECT_EQ(p.error(), "1:11: missing { for switch statement");
}

TEST_F(ParserImplTest, SwitchStmt_MissingBracketRight) {
  ParserImpl p{"switch(a) {"};
  auto e = p.switch_stmt();
  ASSERT_TRUE(p.has_error());
  ASSERT_EQ(e, nullptr);
  EXPECT_EQ(p.error(), "1:12: missing } for switch statement");
}

TEST_F(ParserImplTest, SwitchStmt_InvalidBody) {
  ParserImpl p{R"(switch(a) {
  case: {}
})"};
  auto e = p.switch_stmt();
  ASSERT_TRUE(p.has_error());
  ASSERT_EQ(e, nullptr);
  EXPECT_EQ(p.error(), "2:7: unable to parse case conditional");
}

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