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#ifndef SRC_TINT_LANG_CORE_IR_BINARY_H_
#define SRC_TINT_LANG_CORE_IR_BINARY_H_

#include <string>

#include "src/tint/lang/core/ir/operand_instruction.h"
#include "src/tint/utils/rtti/castable.h"

namespace tint::core::ir {

/// A binary operator.
enum class BinaryOp {
    kAdd,
    kSubtract,
    kMultiply,
    kDivide,
    kModulo,

    kAnd,
    kOr,
    kXor,

    kEqual,
    kNotEqual,
    kLessThan,
    kGreaterThan,
    kLessThanEqual,
    kGreaterThanEqual,

    kShiftLeft,
    kShiftRight
};

/// A binary instruction in the IR.
class Binary final : public Castable<Binary, OperandInstruction<2, 1>> {
  public:
    /// The offset in Operands() for the LHS
    static constexpr size_t kLhsOperandOffset = 0;

    /// The offset in Operands() for the RHS
    static constexpr size_t kRhsOperandOffset = 1;

    /// Constructor (no results, no operands)
    Binary();

    /// Constructor
    /// @param result the result value
    /// @param op the binary operator
    /// @param lhs the lhs of the instruction
    /// @param rhs the rhs of the instruction
    Binary(InstructionResult* result, BinaryOp op, Value* lhs, Value* rhs);
    ~Binary() override;

    /// @copydoc Instruction::Clone()
    Binary* Clone(CloneContext& ctx) override;

    /// @returns the binary operator
    BinaryOp Op() const { return op_; }

    /// @param op the new binary operator
    void SetOp(BinaryOp op) { op_ = op; }

    /// @returns the left-hand-side value for the instruction
    Value* LHS() { return operands_[kLhsOperandOffset]; }

    /// @returns the left-hand-side value for the instruction
    const Value* LHS() const { return operands_[kLhsOperandOffset]; }

    /// @returns the right-hand-side value for the instruction
    Value* RHS() { return operands_[kRhsOperandOffset]; }

    /// @returns the right-hand-side value for the instruction
    const Value* RHS() const { return operands_[kRhsOperandOffset]; }

    /// @returns the friendly name for the instruction
    std::string FriendlyName() const override { return "binary"; }

  private:
    BinaryOp op_ = BinaryOp::kAdd;
};

/// @param kind the enum value
/// @returns the string for the given enum value
std::string_view ToString(BinaryOp kind);

/// Emits the name of the intrinsic type.
template <typename STREAM, typename = traits::EnableIfIsOStream<STREAM>>
auto& operator<<(STREAM& out, BinaryOp kind) {
    return out << ToString(kind);
}

}  // namespace tint::core::ir

#endif  // SRC_TINT_LANG_CORE_IR_BINARY_H_