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#include "src/tint/fuzzers/tint_ast_fuzzer/expression_size.h"

#include <string>

#include "gtest/gtest.h"

#include "src/tint/lang/wgsl/ast/binary_expression.h"
#include "src/tint/lang/wgsl/ast/expression.h"
#include "src/tint/lang/wgsl/ast/int_literal_expression.h"
#include "src/tint/lang/wgsl/program/program.h"
#include "src/tint/lang/wgsl/reader/reader.h"

namespace tint::fuzzers::ast_fuzzer {
namespace {

TEST(ExpressionSizeTest, Basic) {
    std::string content = R"(
    fn main() {
      let a = (0 + 0) * (0 + 0);
    }
  )";
    Source::File file("test.wgsl", content);
    auto program = wgsl::reader::Parse(&file);
    ASSERT_TRUE(program.IsValid()) << program.Diagnostics();

    ExpressionSize expression_size(program);
    for (const auto* node : program.ASTNodes().Objects()) {
        const auto* expr = node->As<ast::Expression>();
        if (expr == nullptr) {
            continue;
        }
        if (expr->Is<ast::IntLiteralExpression>()) {
            ASSERT_EQ(1, expression_size(expr));
        } else {
            const auto* binary_expr = expr->As<ast::BinaryExpression>();
            ASSERT_TRUE(binary_expr != nullptr);
            switch (binary_expr->op) {
                case core::BinaryOp::kAdd:
                    ASSERT_EQ(3, expression_size(expr));
                    break;
                case core::BinaryOp::kMultiply:
                    ASSERT_EQ(7, expression_size(expr));
                    break;
                default:
                    FAIL();
            }
        }
    }
}

}  // namespace
}  // namespace tint::fuzzers::ast_fuzzer