Untitled

using System.Collections.Generic;
using UnityEngine;

public class SkillNode : MonoBehaviour
{
    public char nodeName;
    public List<SkillNode> previousNode;
    public List<SkillNode> nextNode;
    public bool isActive;

    public List<LineRenderer> lineRenderers;
    private void Start()
    {
        DrawEdges();
    }
    private void DrawEdges()
    {
        // DRAWS EDGES BETWEEN EACH NODE
        lineRenderers = new List<LineRenderer>();

        for (int i = 0; i < nextNode.Count; i++)
        {
            GameObject lineObject = new GameObject(nextNode[i].name);
            lineObject.transform.SetParent(transform);

            LineRenderer line = lineObject.AddComponent<LineRenderer>();
            lineRenderers.Add(line);

            line.startWidth = 1f;
            line.endWidth = 1f;
            line.material = new Material(Shader.Find("Unlit/Color")) { color = Color.white };

            line.positionCount = 2;
            line.SetPosition(0, transform.position);
            line.SetPosition(1, nextNode[i].transform.position);
        }
    }

    public bool CanBeActivated()
    {
        if (PreviousNodeIsActive() || NextNodeIsActive())
        {
            return true;
        }
        else
        {
            return false;
        }  
    }

    /*
     * If any of the previous nodes are active, through the structure of the graph
     * this node should also be able to be activated by default
     */
    private bool PreviousNodeIsActive()
    {
        // If the node has no previous nodes, this node is a master node
        if(previousNode.Count == 0) return false;
      
        foreach(SkillNode node in previousNode) 
        {
            if (node.isActive) return true;
        }
        return false;
    }
    private bool NextNodeIsActive()
    {
        // If the node has no next nodes, this node is a leaf node
        if(nextNode.Count == 0) return false;

        foreach(SkillNode node in nextNode)
        {
            if(node.isActive) return true;
        }
        return false;
    }
}