Pong/Assets/Scripts/Game/GameManager.cs

using System;
using System.Collections;
using System.Collections.Generic;
using Unity.Netcode;
using Unity.VisualScripting;
using UnityEngine;
using Object = UnityEngine.Object;
using Random = UnityEngine.Random;

namespace Game {
	public class GameManager : NetworkBehaviour {

		public Object ballPrefab;
		public Object playerPrefab;
		public Object modificationPrefab;
		public ModificationProperties[] modifications;
		public Object wormholePrefab;
		public Object newBallPrefab;

		public static GameManager Singleton { get; private set; }

		public List<Ball> Balls { get; } = new();

		public Player Player1 { get; private set; }

		public Player Player2 { get; private set; }

		private void Awake() {
			SetupPlayers();
			SpawnBall(Player1, true);
		}

		private void OnEnable() {
			Singleton = this;

			// Move this to settings
			Application.targetFrameRate = 144;
			QualitySettings.vSyncCount = 0;
		}

		private IEnumerator Start() {
			while (Application.isPlaying) {
				yield return new WaitForSeconds(1);
				SpawnModification();
				yield return new WaitForSeconds(2);
				SpawnWormhole();
				yield return new WaitForSeconds(1);
				SpawnNewBall();
			}
		}

		private void SetupPlayers() {
			Settings.Type = Type.Hybrid;
			Settings.AIDifficulty = Difficulty.VeryHard;

			var p1Obj = Instantiate(playerPrefab);
			var p2Obj = Instantiate(playerPrefab);

			Player p1, p2;
			switch (Settings.Type) {
				case Type.AI:
					p1 = p1Obj.AddComponent<AIPlayer>();
					p2 = p2Obj.AddComponent<AIPlayer>();
					((AIPlayer) p1).Difficulty = Settings.AIDifficulty;
					((AIPlayer) p2).Difficulty = Settings.AIDifficulty;
					break;
				case Type.RealOnline:
					p1 = p1Obj.AddComponent<RealPlayer>();
					p2 = p2Obj.AddComponent<RealPlayer>();
					((RealPlayer) p1).isThisClient = true;
					break;
				case Type.RealOffline:
					p1 = p1Obj.AddComponent<RealPlayer>();
					p2 = p2Obj.AddComponent<RealPlayer>();
					((RealPlayer) p1).isThisClient = true;
					((RealPlayer) p2).isThisClient = true;
					break;
				case Type.Hybrid:
					p1 = p1Obj.AddComponent<RealPlayer>();
					p2 = p2Obj.AddComponent<AIPlayer>();
					((RealPlayer) p1).isThisClient = true;
					((AIPlayer) p2).Difficulty = Settings.AIDifficulty;
					break;
				default:
					throw new ArgumentOutOfRangeException();
			}

			p1.Side = Side.Bottom;
			p2.Side = Side.Top;

			Player1 = p1;
			Player2 = p2;
		}

		private void SpawnNewBall() {
			var pos = new Vector2(Random.Range(0, Dimensions.Singleton.PlaySize.x) - Dimensions.Singleton.PlaySize.x / 2, Random.Range(-5, 5));
			Instantiate(newBallPrefab, pos, Quaternion.identity).GetComponent<NewBall>().IsPermanent = Random.value > 0.8f;
		}

		private void SpawnWormhole() {
			var pos = new Vector2(Random.Range(0, Dimensions.Singleton.PlaySize.x) - Dimensions.Singleton.PlaySize.x / 2, Random.Range(-5, 5));
			Instantiate(wormholePrefab, pos, Quaternion.identity);
		}

		private void SpawnModification() {
			var pos = new Vector2(Random.Range(0, Dimensions.Singleton.PlaySize.x) - Dimensions.Singleton.PlaySize.x / 2, Random.Range(-2, 2));
			var properties = modifications[Random.Range(0, modifications.Length)];
			var mod = Instantiate(modificationPrefab, pos, Quaternion.identity).GetComponent<Modification>();
			mod.Properties = properties;
		}

		public void SpawnBall(Player towards, bool isPermanent) {
			const float startSpeed = 15;
			var position = new Vector2(0, -towards.transform.position.y * 0.5f);
			var ball = Instantiate(ballPrefab, position, Quaternion.identity).GetComponent<Ball>();
			ball.Rb.velocity = RandomDirectionTowards(towards) * startSpeed;
			ball.IsPermanent = isPermanent;
			ball.Radius = 0.5f;

			Balls.Add(ball);
		}

		private static Vector2 RandomDirectionTowards(Player player) {
			const float maxAngle = 45;
			var radians = Random.Range(-maxAngle, maxAngle) * Mathf.PI / 180;
			var x = Mathf.Sin(radians);
			var y = Mathf.Cos(radians) * player.Side switch {
				Side.Top => 1,
				Side.Bottom => -1,
				_ => throw new ArgumentOutOfRangeException()
			};
			return new Vector2(x, y);
		}

		public void RemoveBall(Ball ball) {
			Balls.Remove(ball);
			Destroy(ball.gameObject);
		}
	}
}