package structures

// NestedInteger  is the interface that allows for creating nested lists.
// You should not implement it, or speculate about its implementation
type NestedInteger struct {
	Num int
	Ns  []*NestedInteger
}

// IsInteger Return true if this NestedInteger holds a single integer, rather than a nested list.
func (n NestedInteger) IsInteger() bool {
	return n.Ns == nil
}

// GetInteger Return the single integer that this NestedInteger holds, if it holds a single integer
// The result is undefined if this NestedInteger holds a nested list
// So before calling this method, you should have a check
func (n NestedInteger) GetInteger() int {
	return n.Num
}

// SetInteger Set this NestedInteger to hold a single integer.
func (n *NestedInteger) SetInteger(value int) {
	n.Num = value
}

// Add  Set this NestedInteger to hold a nested list and adds a nested integer to it.
func (n *NestedInteger) Add(elem NestedInteger) {
	n.Ns = append(n.Ns, &elem)
}

// GetList Return the nested list that this NestedInteger holds, if it holds a nested list
// The list length is zero if this NestedInteger holds a single integer
// You can access NestedInteger's List element directly if you want to modify it
func (n NestedInteger) GetList() []*NestedInteger {
	return n.Ns
}