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#ifndef SRC_TINT_LANG_WGSL_SEM_BUILTIN_ENUM_EXPRESSION_H_
#define SRC_TINT_LANG_WGSL_SEM_BUILTIN_ENUM_EXPRESSION_H_

#include "src/tint/lang/wgsl/sem/expression.h"

// Forward declarations
namespace tint::core::type {
class Type;
}  // namespace tint::core::type

namespace tint::sem {

/// Base class for BuiltinEnumExpression.
/// Useful for Is() queries.
class BuiltinEnumExpressionBase : public Castable<BuiltinEnumExpressionBase, Expression> {
  public:
    /// Constructor
    /// @param declaration the AST node
    /// @param statement the statement that owns this expression
    BuiltinEnumExpressionBase(const ast::Expression* declaration, const Statement* statement);

    /// Destructor
    ~BuiltinEnumExpressionBase() override;
};

/// BuiltinEnumExpression holds the semantic information for expression nodes that resolve to a
/// builtin enumerator value.
template <typename ENUM>
class BuiltinEnumExpression
    : public Castable<BuiltinEnumExpression<ENUM>, BuiltinEnumExpressionBase> {
  public:
    /// Constructor
    /// @param declaration the AST node
    /// @param statement the statement that owns this expression
    /// @param value the enumerator value
    BuiltinEnumExpression(const ast::Expression* declaration,
                          const Statement* statement,
                          ENUM value)
        : BuiltinEnumExpression<ENUM>::Base(declaration, statement), value_(value) {}

    /// Destructor
    ~BuiltinEnumExpression() override = default;

    /// @return the enumerator value
    ENUM Value() const { return value_; }

  private:
    const ENUM value_;
};

}  // namespace tint::sem

#endif  // SRC_TINT_LANG_WGSL_SEM_BUILTIN_ENUM_EXPRESSION_H_