// Utility functions for updating variables in the VM
// TODO (VM#1145) these should be moved to top-level VM API
const getVariable = (vm, targetId, variableId) => {
 const target = targetId ?
 vm.runtime.getTargetById(targetId) :
 vm.runtime.getTargetForStage();
 return target.variables[variableId];
};

const getVariableValue = (vm, targetId, variableId) => {
 const variable = getVariable(vm, targetId, variableId);
 // If array, return a new copy for mutating, ensuring that updates stay immutable.
 if (variable.value instanceof Array) return variable.value.slice();
 return variable.value;
};

const setVariableValue = (vm, targetId, variableId, value) => {
 getVariable(vm, targetId, variableId).value = value;
};

export {
 getVariable,
 getVariableValue,
 setVariableValue
};