namespace GeometryTD.Procedure
{
    public static class RunStateAdvanceService
    {
        public static bool TryCompleteCurrentNode(
            RunState runState,
            RunNodeCompletionStatus completionStatus,
            RunNodeCompletionSnapshot completionSnapshot)
        {
            if (runState == null || runState.IsCompleted)
            {
                return false;
            }

            RunNodeState currentNode = runState.CurrentNode;
            if (currentNode == null || currentNode.Status != RunNodeStatus.Available)
            {
                return false;
            }

            runState.ApplyCompletionSnapshot(completionSnapshot);

            if (completionStatus == RunNodeCompletionStatus.Exception)
            {
                currentNode.Status = RunNodeStatus.Exception;
                return true;
            }

            if (completionStatus != RunNodeCompletionStatus.Completed)
            {
                return false;
            }

            currentNode.Status = RunNodeStatus.Completed;

            int nextIndex = runState.CurrentNodeIndex + 1;
            if (nextIndex >= runState.Nodes.Count)
            {
                runState.CurrentNodeContinueChallengeLayer = 0;
                runState.CurrentNodeIndex = runState.Nodes.Count;
                runState.IsCompleted = true;
                return true;
            }

            runState.CurrentNodeIndex = nextIndex;
            runState.CurrentNodeContinueChallengeLayer = 0;
            RunNodeState nextNode = runState.CurrentNode;
            if (nextNode != null && nextNode.Status == RunNodeStatus.Locked)
            {
                nextNode.Status = RunNodeStatus.Available;
            }

            return true;
        }
    }
}