// 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/switch_statement.h"

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

namespace tint::ast {
namespace {

using SwitchStatementTest = TestHelper;

TEST_F(SwitchStatementTest, Creation) {
    CaseSelectorList lit;
    lit.push_back(create<SintLiteralExpression>(1));

    auto* ident = Expr("ident");
    CaseStatementList body;
    auto* case_stmt = create<CaseStatement>(lit, Block());
    body.push_back(case_stmt);

    auto* stmt = create<SwitchStatement>(ident, body);
    EXPECT_EQ(stmt->condition, ident);
    ASSERT_EQ(stmt->body.size(), 1u);
    EXPECT_EQ(stmt->body[0], case_stmt);
}

TEST_F(SwitchStatementTest, Creation_WithSource) {
    auto* ident = Expr("ident");

    auto* stmt =
        create<SwitchStatement>(Source{Source::Location{20, 2}}, ident, CaseStatementList());
    auto src = stmt->source;
    EXPECT_EQ(src.range.begin.line, 20u);
    EXPECT_EQ(src.range.begin.column, 2u);
}

TEST_F(SwitchStatementTest, IsSwitch) {
    CaseSelectorList lit;
    lit.push_back(create<SintLiteralExpression>(2));

    auto* ident = Expr("ident");
    CaseStatementList body;
    body.push_back(create<CaseStatement>(lit, Block()));

    auto* stmt = create<SwitchStatement>(ident, body);
    EXPECT_TRUE(stmt->Is<SwitchStatement>());
}

TEST_F(SwitchStatementTest, Assert_Null_Condition) {
    EXPECT_FATAL_FAILURE(
        {
            ProgramBuilder b;
            CaseStatementList cases;
            cases.push_back(b.create<CaseStatement>(CaseSelectorList{b.Expr(1)}, b.Block()));
            b.create<SwitchStatement>(nullptr, cases);
        },
        "internal compiler error");
}

TEST_F(SwitchStatementTest, Assert_Null_CaseStatement) {
    EXPECT_FATAL_FAILURE(
        {
            ProgramBuilder b;
            b.create<SwitchStatement>(b.Expr(true), CaseStatementList{nullptr});
        },
        "internal compiler error");
}

TEST_F(SwitchStatementTest, Assert_DifferentProgramID_Condition) {
    EXPECT_FATAL_FAILURE(
        {
            ProgramBuilder b1;
            ProgramBuilder b2;
            b1.create<SwitchStatement>(b2.Expr(true), CaseStatementList{
                                                          b1.create<CaseStatement>(
                                                              CaseSelectorList{
                                                                  b1.Expr(1),
                                                              },
                                                              b1.Block()),
                                                      });
        },
        "internal compiler error");
}

TEST_F(SwitchStatementTest, Assert_DifferentProgramID_CaseStatement) {
    EXPECT_FATAL_FAILURE(
        {
            ProgramBuilder b1;
            ProgramBuilder b2;
            b1.create<SwitchStatement>(b1.Expr(true), CaseStatementList{
                                                          b2.create<CaseStatement>(
                                                              CaseSelectorList{
                                                                  b2.Expr(1),
                                                              },
                                                              b2.Block()),
                                                      });
        },
        "internal compiler error");
}

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