Day 6 of AoC 2019 in unity.

day6.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.Linq;

public class Day6 : MonoBehaviour
{

    public TextAsset input;

    public class Node
    {
        public Node parent;
        public string name;
        public int depth;
        public List<Node> children = new List<Node>();
        public GameObject gameObj;
        public void SetChild(Node child)
        {
            children.Add(child);
            child.gameObj.transform.SetParent(gameObj.transform);
            child.gameObj.transform.position = gameObj.transform.position + ((new Vector3(Random.Range(-1, 1f), Random.Range(-1, 1f), 0).normalized * Random.Range(5,30)));
            child.parent = this;
        }

    }

    public GameObject nodePref;

    public Node root;

    private List<Node> allNodes = new List<Node>();


    // Start is called before the first frame update
    void Start()
    {
        string[] orbs = input.text.Split('\n');

        StartCoroutine("Part1", orbs);

    }


    void Part2()
    {
        Node you = GetNode("YOU");
        Node san = GetNode("SAN");

        List<Node> path1 = new List<Node>();
        Node n = you.parent;
        while (n.parent != null)
        {
            path1.Add(n);
            n = n.parent;
        }
        List<Node> path2 = new List<Node>();
        Node j = san.parent;
        while (j.parent != null)
        {
            path2.Add(j);
            j = j.parent;
        }
        Node lowestParent = you;
        for(int i = 0; i <path1.Count; i++)
        {
            if (path2.Contains(path1[i]))
            {
                Debug.Log("Highest common parent: " + path1[i].name);
                lowestParent = path1[i];
                break;
            }
        }
        n = you.parent;
        int chain = 0;
        while(n != lowestParent)
        {
            n.gameObj.GetComponent<SphereRotate>().SetColor(Color.blue);
            chain++;
            n = n.parent;
            
        }
        n = san.parent;
        while (n != lowestParent)
        {
            n.gameObj.GetComponent<SphereRotate>().SetColor(Color.blue);
            chain++;
            n = n.parent;

        }

        Debug.Log(chain);

    }


    IEnumerator Part1(string[] orbs)
    {
        foreach (string o in orbs)
        {
            string[] objs = o.Split(')');
            
            Node center = GetNode(objs[0]);
            Node child = GetNode(objs[1]);
            if(center.name == "YOU")
            {
                center.gameObj.GetComponent<SphereRotate>().SetColor(Color.green);
            }
            if (child.name == "YOU")
            {
                child.gameObj.GetComponent<SphereRotate>().SetColor(Color.green);
            }


            if (center.name == "SAN")
            {
                center.gameObj.GetComponent<SphereRotate>().SetColor(Color.red);
            }
            if (child.name == "SAN")
            {
                child.gameObj.GetComponent<SphereRotate>().SetColor(Color.red);
            }
            center.SetChild(child);

            yield return null;
            Debug.Log("Tick");
            
        }

        int totalOrbs = 0;
        foreach(Node n in allNodes)
        {
            int depth = 0;
            Node p = n;
            while (p.parent != null)
            {
                p = p.parent;
                depth++;
            }
            n.depth = depth;
            totalOrbs += depth;
        }

        Debug.Log(totalOrbs);

        Part2();

    }


    Node GetNode(string n)
    {
        if (root == null)
        {
            GameObject g = Instantiate(nodePref);
            g.name = n;
            root = new Node() { depth = 0, name = n, gameObj = g };
            allNodes.Add(root);
            return root;
        }
        else
        {
            Node search = (from Node nn in allNodes where nn.name == n select nn).FirstOrDefault();
            if (search == null)
            {
                GameObject g = Instantiate(nodePref);
                g.name = n;
                Node nn = new Node() { depth = 0, name = n, gameObj = g };
                allNodes.Add(nn);
                return nn;
            }
            else
            {
                return search;

            }
        }
    }

}