// 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 "src/ast/binary_expression.h"

#include <sstream>

#include "src/ast/identifier_expression.h"
#include "src/ast/test_helper.h"

namespace tint {
namespace ast {
namespace {

using BinaryExpressionTest = TestHelper;

TEST_F(BinaryExpressionTest, Creation) {
  auto* lhs =
      create<IdentifierExpression>(Source{}, mod.RegisterSymbol("lhs"), "lhs");
  auto* rhs =
      create<IdentifierExpression>(Source{}, mod.RegisterSymbol("rhs"), "rhs");

  BinaryExpression r(Source{}, BinaryOp::kEqual, lhs, rhs);
  EXPECT_EQ(r.lhs(), lhs);
  EXPECT_EQ(r.rhs(), rhs);
  EXPECT_EQ(r.op(), BinaryOp::kEqual);
}

TEST_F(BinaryExpressionTest, Creation_WithSource) {
  auto* lhs =
      create<IdentifierExpression>(Source{}, mod.RegisterSymbol("lhs"), "lhs");
  auto* rhs =
      create<IdentifierExpression>(Source{}, mod.RegisterSymbol("rhs"), "rhs");

  BinaryExpression r(Source{Source::Location{20, 2}}, BinaryOp::kEqual, lhs,
                     rhs);
  auto src = r.source();
  EXPECT_EQ(src.range.begin.line, 20u);
  EXPECT_EQ(src.range.begin.column, 2u);
}

TEST_F(BinaryExpressionTest, IsBinary) {
  auto* lhs =
      create<IdentifierExpression>(Source{}, mod.RegisterSymbol("lhs"), "lhs");
  auto* rhs =
      create<IdentifierExpression>(Source{}, mod.RegisterSymbol("rhs"), "rhs");

  BinaryExpression r(Source{}, BinaryOp::kEqual, lhs, rhs);
  EXPECT_TRUE(r.Is<BinaryExpression>());
}

TEST_F(BinaryExpressionTest, IsValid) {
  auto* lhs =
      create<IdentifierExpression>(Source{}, mod.RegisterSymbol("lhs"), "lhs");
  auto* rhs =
      create<IdentifierExpression>(Source{}, mod.RegisterSymbol("rhs"), "rhs");

  BinaryExpression r(Source{}, BinaryOp::kEqual, lhs, rhs);
  EXPECT_TRUE(r.IsValid());
}

TEST_F(BinaryExpressionTest, IsValid_Null_LHS) {
  auto* rhs =
      create<IdentifierExpression>(Source{}, mod.RegisterSymbol("rhs"), "rhs");

  BinaryExpression r(Source{}, BinaryOp::kEqual, nullptr, rhs);
  EXPECT_FALSE(r.IsValid());
}

TEST_F(BinaryExpressionTest, IsValid_Invalid_LHS) {
  auto* lhs =
      create<IdentifierExpression>(Source{}, mod.RegisterSymbol(""), "");
  auto* rhs =
      create<IdentifierExpression>(Source{}, mod.RegisterSymbol("rhs"), "rhs");

  BinaryExpression r(Source{}, BinaryOp::kEqual, lhs, rhs);
  EXPECT_FALSE(r.IsValid());
}

TEST_F(BinaryExpressionTest, IsValid_Null_RHS) {
  auto* lhs =
      create<IdentifierExpression>(Source{}, mod.RegisterSymbol("lhs"), "lhs");

  BinaryExpression r(Source{}, BinaryOp::kEqual, lhs, nullptr);
  EXPECT_FALSE(r.IsValid());
}

TEST_F(BinaryExpressionTest, IsValid_Invalid_RHS) {
  auto* lhs =
      create<IdentifierExpression>(Source{}, mod.RegisterSymbol("lhs"), "lhs");
  auto* rhs =
      create<IdentifierExpression>(Source{}, mod.RegisterSymbol(""), "");

  BinaryExpression r(Source{}, BinaryOp::kEqual, lhs, rhs);
  EXPECT_FALSE(r.IsValid());
}

TEST_F(BinaryExpressionTest, IsValid_Binary_None) {
  auto* lhs =
      create<IdentifierExpression>(Source{}, mod.RegisterSymbol("lhs"), "lhs");
  auto* rhs =
      create<IdentifierExpression>(Source{}, mod.RegisterSymbol("rhs"), "rhs");

  BinaryExpression r(Source{}, BinaryOp::kNone, lhs, rhs);
  EXPECT_FALSE(r.IsValid());
}

TEST_F(BinaryExpressionTest, ToStr) {
  auto* lhs =
      create<IdentifierExpression>(Source{}, mod.RegisterSymbol("lhs"), "lhs");
  auto* rhs =
      create<IdentifierExpression>(Source{}, mod.RegisterSymbol("rhs"), "rhs");

  BinaryExpression r(Source{}, BinaryOp::kEqual, lhs, rhs);
  std::ostringstream out;
  r.to_str(out, 2);
  EXPECT_EQ(demangle(out.str()), R"(  Binary[not set]{
    Identifier[not set]{lhs}
    equal
    Identifier[not set]{rhs}
  }
)");
}

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