// Copyright 2022 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/reader/wgsl/parser_impl_test_helper.h"

namespace tint::reader::wgsl {
namespace {

TEST_F(ParserImplTest, ElementCountExpression_Math) {
    auto p = parser("a * b");
    auto e = p->element_count_expression();
    EXPECT_TRUE(e.matched);
    EXPECT_FALSE(e.errored);
    EXPECT_FALSE(p->has_error()) << p->error();
    ASSERT_NE(e.value, nullptr);

    ASSERT_TRUE(e->Is<ast::BinaryExpression>());
    auto* rel = e->As<ast::BinaryExpression>();
    EXPECT_EQ(ast::BinaryOp::kMultiply, rel->op);

    ASSERT_TRUE(rel->lhs->Is<ast::IdentifierExpression>());
    auto* ident = rel->lhs->As<ast::IdentifierExpression>();
    EXPECT_EQ(ident->symbol, p->builder().Symbols().Get("a"));

    ASSERT_TRUE(rel->rhs->Is<ast::IdentifierExpression>());
    ident = rel->rhs->As<ast::IdentifierExpression>();
    EXPECT_EQ(ident->symbol, p->builder().Symbols().Get("b"));
}

TEST_F(ParserImplTest, ElementCountExpression_Bitwise) {
    auto p = parser("a | true");
    auto e = p->element_count_expression();
    EXPECT_TRUE(e.matched);
    EXPECT_FALSE(e.errored);
    EXPECT_FALSE(p->has_error()) << p->error();
    ASSERT_NE(e.value, nullptr);

    ASSERT_TRUE(e->Is<ast::BinaryExpression>());
    auto* rel = e->As<ast::BinaryExpression>();
    EXPECT_EQ(ast::BinaryOp::kOr, rel->op);

    ASSERT_TRUE(rel->lhs->Is<ast::IdentifierExpression>());
    auto* ident = rel->lhs->As<ast::IdentifierExpression>();
    EXPECT_EQ(ident->symbol, p->builder().Symbols().Get("a"));

    ASSERT_TRUE(rel->rhs->Is<ast::BoolLiteralExpression>());
    ASSERT_TRUE(rel->rhs->As<ast::BoolLiteralExpression>()->value);
}

TEST_F(ParserImplTest, ElementCountExpression_NoMatch) {
    auto p = parser("if (a) { }");
    auto e = p->element_count_expression();
    EXPECT_FALSE(e.matched);
    EXPECT_FALSE(e.errored);
    EXPECT_FALSE(p->has_error()) << p->error();
    ASSERT_EQ(e.value, nullptr);
}

TEST_F(ParserImplTest, ElementCountExpression_InvalidRHS) {
    auto p = parser("a * if");
    auto e = p->element_count_expression();
    EXPECT_FALSE(e.matched);
    EXPECT_TRUE(e.errored);
    EXPECT_TRUE(p->has_error());
    ASSERT_EQ(e.value, nullptr);
    EXPECT_EQ("1:5: unable to parse right side of * expression", p->error());
}

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