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

namespace Game {
	public class GameManager : NetworkBehaviour {

		public static GameManager Singleton { get; private set; }

		private void OnEnable() {
			Singleton = this;
		}

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

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

		private static void Tests() {
			var v1 = new Vector2(1, 3);
			var v2 = new Vector2(3, 2);
			var v3 = new Vector2(4, 4);
			var v4 = new Vector2(1, 1);
			var v5 = new Vector2(4, 1);
			var v6 = new Vector2(2, 5);
			var v7 = new Vector2(2, 3);
			var v8 = new Vector2(-1, 4);
			var v9 = new Vector2(-2, 1);
			var v10 = new Vector2(3, -1);
			Vector2 p, rs;
			Assert.IsTrue(AIPlayer.Intersect(v8, v4, v1, v9, out p, out rs));
			Assert.IsTrue(AIPlayer.Intersect(v1, v2, v4, v7, out p, out rs));
			Assert.IsTrue(AIPlayer.Intersect(v10, v6, v9, v2, out p, out rs));
			Assert.IsTrue(AIPlayer.Intersect(v9, v5, v8, v10, out p, out rs));
			Assert.IsFalse(AIPlayer.Intersect(v8, v4, v6, v5, out p, out rs));
			Assert.IsFalse(AIPlayer.Intersect(v3, v5, v6, v8, out p, out rs));
			Assert.IsFalse(AIPlayer.Intersect(v10, v4, v8, v9, out p, out rs));
			Assert.IsFalse(AIPlayer.Intersect(v1, v7, v3, v2, out p, out rs));

			var v11 = new Vector2(0, 0);
			var v12 = new Vector2(0, 5);
			var v13 = new Vector2(-2, 2);
			var v14 = new Vector2(2, 2);
			Assert.IsTrue(AIPlayer.Intersect(v11, v12, v13, v14, out p, out rs));
			Assert.AreApproximatelyEqual(rs.x, 0.4f);
			Assert.AreApproximatelyEqual(rs.y, 0.5f);
		}

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

			var ball = Instantiate(ballPrefab).GetComponent<Ball>();
			Balls.Add(ball);
			ball.Radius = 0.5f;

			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.Real:
					p1 = p1Obj.AddComponent<RealPlayer>();
					p2 = p2Obj.AddComponent<RealPlayer>();
					((RealPlayer) p1).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;

			Tests();
		}

		private IEnumerator Start() {
			while (Application.isPlaying) {
				yield return new WaitForSeconds(5);
				SpawnModification();
			}
		}

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

		private void FixedUpdate() {
			foreach (var ball in Balls.Where(b => !b.IsAlive))
				Destroy(ball.gameObject);
			
			int count = Balls.RemoveAll(b => !b.IsAlive);
			for (int _ = 0; _ < count; _++) {
				Balls.Add(Instantiate(ballPrefab).GetComponent<Ball>());
			}
		}

	}
}