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#ifndef SRC_TINT_LANG_CORE_IR_CALL_H_
#define SRC_TINT_LANG_CORE_IR_CALL_H_

#include <span>
#include <string>

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

namespace tint::core::ir {

/// A Call instruction in the IR.
class Call : public Castable<Call, OperandInstruction<4, 1>> {
  public:
    ~Call() override;

    /// @returns the offset of the arguments in Operands()
    virtual size_t ArgsOperandOffset() const { return 0; }

    /// Sets the explicit template params for the call
    void SetExplicitTemplateParams(VectorRef<const core::type::Type*> params) {
        explicit_template_params_ = params;
    }

    /// Retrieves the explicit template params for the call
    tint::VectorRef<const core::type::Type*> ExplicitTemplateParams() const {
        return explicit_template_params_;
    }

    /// @returns the call arguments
    std::span<Value* const> Args() { return operands_.AsSpan().subspan(ArgsOperandOffset()); }

    /// @returns the call arguments
    std::span<const Value* const> Args() const {
        return operands_.AsSpan().subspan(ArgsOperandOffset());
    }

    /// Sets the argument at `idx` of `arg`. `idx` must be within bounds of the current argument
    /// set.
    void SetArg(size_t idx, ir::Value* arg) { SetOperand(ArgsOperandOffset() + idx, arg); }

    /// Append a new argument to the argument list for this call instruction.
    /// @param arg the argument value to append
    void AppendArg(ir::Value* arg) { AddOperand(operands_.Length(), arg); }

    /// @returns the side effects for this instruction
    Accesses GetSideEffects() const override { return Accesses{Access::kLoad, Access::kStore}; }

  protected:
    /// Constructor
    explicit Call(Id id);

    Vector<const core::type::Type*, 1> explicit_template_params_;
};

}  // namespace tint::core::ir

#endif  // SRC_TINT_LANG_CORE_IR_CALL_H_
