using System.Collections.Generic;
using UnityEngine;

// Use this Script in parent folder of all Humans
public class ChangeModelMaterial : MonoBehaviour
{
    [Header("Highlighting Materials:")]
    public Material highlightRed;
    public Material highlightGreen;
    public Material highlightYellow;

    [Header("Thresholds:")]
    [Tooltip("The maximum number of people (including the observed) that will be colored green.\n Threshold Green = 1 means that no further person is allowed to approach.")]
    public int thresholdGreen = 1;
    [Tooltip("The maximum number of people (including the observed) that will be colored yellow.\n Threshold Yellow = 2 means that only one other person may approach.")]
    public int thresholdYellow = 2;
    
    [Space]
    public float radius = 1f;

    private Vector3 center;
    private Collider[] hitHumans;
    private List<Component> allHumansTransform = new List<Component>(); // only first depth children of parent (Humans)

    // Start is called before the first frame update
    private void Start()
    {
        Component[] allTransform = GetComponentsInChildren<Transform>(); // all possible children of parent object
        foreach (Transform child in allTransform)
        {
            if (child.parent == allTransform[0])
            {
                allHumansTransform.Add(child);
            }
        }
    }

    //private void OnDrawGizmos()
    //{
    //    Gizmos.color = Color.red;
    //    Gizmos.DrawWireSphere(center, radius);
    //}

    private void FixedUpdate()
    {
        foreach (Component lst in allHumansTransform)
        {
            center = lst.GetComponent<Transform>().position;
            // only collisions with Layer "Humans" are listed in "hitHumans"
            hitHumans = Physics.OverlapSphere(center, radius, LayerMask.GetMask("Humans"));

            // if Human hits lesser then thresholdYellow but is hitting minimum 1 other human, then Material change to Green
            if (hitHumans.Length <= thresholdGreen)
            {
                Debug.Log(lst.gameObject.name + " set to Green");
                lst.transform.GetChild(0).GetChild(0).gameObject.GetComponent<SkinnedMeshRenderer>().material = highlightGreen;
            }
            // if Human hits lesser then thresholdYellow but is hitting minimum 1 other human, then Material change to Yellow
            else if (hitHumans.Length <= thresholdYellow)
            {
                Debug.Log(lst.gameObject.name + " set to Yellow");
                lst.transform.GetChild(0).GetChild(0).gameObject.GetComponent<SkinnedMeshRenderer>().material = highlightYellow;
            }
            else
            {
                // if Humans hits somebody else (threshold >= 1), then Material change to Red
                foreach (Collider hitHuman in hitHumans)
                {
                    if (lst.gameObject.name != hitHuman.gameObject.name) // overlap with themselves
                    {
                        if (hitHuman.transform.GetChild(0).GetChild(0).gameObject.GetComponent<SkinnedMeshRenderer>().material != highlightRed
                            || lst.transform.GetChild(0).GetChild(0).gameObject.GetComponent<SkinnedMeshRenderer>().material != highlightRed)
                        {
                            hitHuman.transform.GetChild(0).GetChild(0).gameObject.GetComponent<SkinnedMeshRenderer>().material = highlightRed;
                            lst.transform.GetChild(0).GetChild(0).gameObject.GetComponent<SkinnedMeshRenderer>().material = highlightRed;
                        }
                    }
                }
            }
        }
    }
}