// 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/tint/ast/if_statement.h"

#include "gtest/gtest-spi.h"
#include "src/tint/ast/discard_statement.h"
#include "src/tint/ast/test_helper.h"

namespace tint::ast {
namespace {

using IfStatementTest = TestHelper;

TEST_F(IfStatementTest, Creation) {
  auto* cond = Expr("cond");
  auto* stmt = If(Source{Source::Location{20, 2}}, cond,
                  Block(create<DiscardStatement>()));
  auto src = stmt->source;
  EXPECT_EQ(src.range.begin.line, 20u);
  EXPECT_EQ(src.range.begin.column, 2u);
}

TEST_F(IfStatementTest, IsIf) {
  auto* stmt = If(Expr(true), Block());
  EXPECT_TRUE(stmt->Is<IfStatement>());
}

TEST_F(IfStatementTest, Assert_Null_Condition) {
  EXPECT_FATAL_FAILURE(
      {
        ProgramBuilder b;
        b.If(nullptr, b.Block());
      },
      "internal compiler error");
}

TEST_F(IfStatementTest, Assert_Null_Body) {
  EXPECT_FATAL_FAILURE(
      {
        ProgramBuilder b;
        b.If(b.Expr(true), nullptr);
      },
      "internal compiler error");
}

TEST_F(IfStatementTest, Assert_InvalidElse) {
  EXPECT_FATAL_FAILURE(
      {
        ProgramBuilder b;
        b.If(b.Expr(true), b.Block(), b.CallStmt(b.Call("foo")));
      },
      "internal compiler error");
}

TEST_F(IfStatementTest, Assert_DifferentProgramID_Cond) {
  EXPECT_FATAL_FAILURE(
      {
        ProgramBuilder b1;
        ProgramBuilder b2;
        b1.If(b2.Expr(true), b1.Block());
      },
      "internal compiler error");
}

TEST_F(IfStatementTest, Assert_DifferentProgramID_Body) {
  EXPECT_FATAL_FAILURE(
      {
        ProgramBuilder b1;
        ProgramBuilder b2;
        b1.If(b1.Expr(true), b2.Block());
      },
      "internal compiler error");
}

TEST_F(IfStatementTest, Assert_DifferentProgramID_ElseStatement) {
  EXPECT_FATAL_FAILURE(
      {
        ProgramBuilder b1;
        ProgramBuilder b2;
        b1.If(b1.Expr(true), b1.Block(), b2.If(b2.Expr("ident"), b2.Block()));
      },
      "internal compiler error");
}

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