public async Task ChangeParentAsync(string nodeId, string newParentId)
{
if (nodeId == null)
{
throw new ArgumentNullException(nameof(nodeId));
}
if (newParentId == null)
{
throw new ArgumentNullException(nameof(newParentId));
}
var node = await _repository.GetAsync(nodeId);
if (node == null)
{
throw new ArgumentException(nameof(node));
}
var parent = await _repository.GetAsync(newParentId);
if (parent == null)
{
throw new ArgumentException(nameof(parent));
}
if (nodeId == newParentId)
{
return;
}
//handling situation when there is a new root node
if (node.ParentId == null)
{
var children = _repository.GetAsync(x => x.ParentId == node.Id).ToList();
if (children.Count != 1)
{
throw new ArgumentException($"Root should have only one child to be replaced.");
}
var newRoot = children.First();
Task.Run(async() => await _worker.ChangeRoot(newRoot, node, parent));
}
else
{
Task.Run(async() => await _worker.PropagateChanges(node, parent));
}
}
