using System;
using System.Collections;
using System.Collections.Generic;
using System.Transactions;
using Unity.Netcode;
using UnityEditor;
using UnityEditor.UIElements;
using UnityEngine;
using UnityEngine.InputSystem;
using UnityEngine.UIElements;

namespace Game {
	
	public enum Side {Top, Bottom}
	
	public class Player : NetworkBehaviour {

		public Side Side { get; set; }

		protected bool goingLeft, goingRight;

		public VisualElement Panel { get; private set; }

		public List<ActiveModification> Modifications { get; } = new();
		
		[SerializeField]
		public int score = 0;
		
		// Units per second
		protected float Speed => 15;
		
		// Unit distance from zero
		protected float Border => Dimensions.Singleton.Width / 2;

		protected float Width => transform.localScale.x;
		
		private float LeftEdge => X - Width / 2;
		private float RightEdge => X + Width / 2;

		protected float X => transform.position.x;

		protected float Y => transform.position.y;

		public void GainScore() {
			score++;
			UpdatePanel();
		}

		private void UpdatePanel() {
			Panel.Q<TextElement>("score").text = score.ToString();
		}

		protected void ClampInsideBorders() {
			if (LeftEdge < -Border)
				transform.Translate(Vector2.right * (-Border - LeftEdge), Space.World);
			if (RightEdge > Border) 
				transform.Translate(Vector2.left * (RightEdge - Border), Space.World);
		}

		protected void TryLinearMove(float h) {
			Vector2 trans = new Vector2((goingLeft ? -1 : 0) + (goingRight ? 1 : 0), 0);
			trans *= Speed * h;
			transform.Translate(trans, Space.World);
			ClampInsideBorders();
		}

		private void Start() {
			float y = Side switch {
				Side.Bottom => Dimensions.Singleton.boardBottom,
				Side.Top => Dimensions.Singleton.boardTop,
				_ => throw new ArgumentOutOfRangeException()
			};
			transform.position = new Vector2(0, y);
			if (Side == Side.Top)
				transform.Rotate(transform.forward, 180);
			Panel = GameUI.Singleton.PlayerPanel(Side);
			UpdatePanel();
		}

		private void OnCollisionEnter2D(Collision2D other) {
			other.gameObject.GetComponent<Ball>().LastContactPlayer = this;
		}
	}
	
	public class RealPlayer : Player {
		public bool isThisClient;
		
		private void FixedUpdate() {
			if (!isThisClient)
				return;
			
			var keyboard = Keyboard.current;
			goingLeft = keyboard.aKey.isPressed;
			goingRight = keyboard.dKey.isPressed;

			TryLinearMove(Time.fixedDeltaTime);
		}
	}
}