using System;
using System.Collections.Generic;
using System.Linq;
using Unity.VisualScripting;
using UnityEngine;
using static System.Math;
using static UnityEngine.Mathf;

public class CameraOperator : MonoBehaviour
{
	private Dictionary<int, GameObject> players = new Dictionary<int, GameObject>();

	public void AddPlayer(GameObject player)
	{
		players[player.GetInstanceID()] = player;
	}

	public void RemovePlayer(int id)
	{
		players.Remove(id);
	}

	/// <summary>
	/// Rotates the camera to point at the center between the players.
	/// </summary>
	void LateUpdate()
	{
		if (players.Count < 1)
		{
			return;
		}
		float x = 0;
		float y = 0;
		float z = 30;
		foreach (GameObject p in players.Values)
		{
			if (p.IsDestroyed())
				continue;
			Vector3 position = p.transform.localPosition;
			z = position.z;
			x += position.x;
			y += position.y;
		}
		x /= players.Count();
		y /= players.Count();
		float a = z - transform.localPosition.z;
		float cXAxis = (float)Sqrt(Pow(a, 2) + Pow(x, 2));
		float cYAxis = (float)Sqrt(Pow(a, 2) + Pow(y, 2));
		Vector3 xyRotation = new Vector3(Rad2Deg * Acos(a / cYAxis) * -Math.Sign(y),
										 Rad2Deg * Acos(a / cXAxis) * Math.Sign(x), 0);
		if (transform.localEulerAngles != xyRotation / 2)
		{
			transform.localEulerAngles = xyRotation / 2;
		}
	}
}