Pong/Assets/Scripts/Game/GameManager.cs

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

namespace Game {
	public class GameManager : NetworkBehaviour {

		public BalanceValues balanceValues;

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

		public static GameManager Singleton { get; private set; }

		public static BalanceValues BalanceValues => Singleton.balanceValues;

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

		public Player Player1 { get; private set; }

		public Player Player2 { get; private set; }

		private void Awake() {
			Singleton = this;
			
			SetupPlayers();
		}

		private void OnEnable() {
			// Move this to settings
			Application.targetFrameRate = 144;
			QualitySettings.vSyncCount = 0;
		}

		private IEnumerator SpawnLoop(Spawnable spawnable) {
			SpawnRate required = RoomSettings.SpawnRates[spawnable];
			if (required == SpawnRate.Never)
				yield break;
			float baseSeconds = balanceValues.spawnRates.First(s => s.spawnable == spawnable).values.First(v => v.spawnRate == required).baseSeconds;
			while (Application.isPlaying) {
				yield return new WaitForSeconds(baseSeconds);
				switch (spawnable) {
					case Spawnable.NewBallTemporary:
						SpawnNewBall(false);
						break;
					case Spawnable.NewBallPermanent:
						SpawnNewBall(true);
						break;
					case Spawnable.Modification:
						SpawnModification();
						break;
					case Spawnable.Wormhole:
						SpawnWormhole();
						break;
				}
			}
		}

		private void Start() {
			SpawnBall(Player1, true);
			StartCoroutine(SpawnLoop(Spawnable.NewBallTemporary));
			StartCoroutine(SpawnLoop(Spawnable.NewBallPermanent));
			StartCoroutine(SpawnLoop(Spawnable.Modification));
			StartCoroutine(SpawnLoop(Spawnable.Wormhole));
		}

		private void SetupPlayers() {
			var p1Obj = Instantiate(playerPrefab);
			var p2Obj = Instantiate(playerPrefab);

			Player p1, p2;
			switch (RoomSettings.Type) {
				case Type.AI:
					p1 = p1Obj.AddComponent<AIPlayer>();
					p2 = p2Obj.AddComponent<AIPlayer>();
					((AIPlayer) p1).Difficulty = RoomSettings.AIDifficulty;
					((AIPlayer) p2).Difficulty = RoomSettings.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 = RoomSettings.AIDifficulty;
					break;
				default:
					throw new ArgumentOutOfRangeException();
			}

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

			Player1 = p1;
			Player2 = p2;

			p1.borderZonePrefab = p2.borderZonePrefab = borderZonePrefab;
		}

		private Vector2 GetSpawnPosition() {
			Vector2 area = balanceValues.spawnArea * Dimensions.Singleton.playGroundSize * 0.5f;
			float x = Random.Range(-area.x, area.x);
			float y = Random.Range(-area.y, area.y);
			return new Vector2(x, y);
		}

		private void SpawnNewBall(bool permanent) {
			Instantiate(newBallPrefab, GetSpawnPosition(), Quaternion.identity).GetComponent<NewBall>().IsPermanent = permanent;
		}

		private void SpawnWormhole() {
			Instantiate(wormholePrefab, GetSpawnPosition(), Quaternion.identity);
		}

		private void SpawnModification() {
			var properties = modifications[Random.Range(0, modifications.Length)];
			var mod = Instantiate(modificationPrefab, GetSpawnPosition(), Quaternion.identity).GetComponent<Modification>();
			mod.Properties = properties;
		}

		public void SpawnBall(Player towards, bool isPermanent) {
			float startSpeed = balanceValues.ballSpeed;
			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);
		}
	}
}