using System;
using System.Collections.Generic;
using System.Linq;
using Unity.Netcode;
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();

		private int Score { get; set; }

		// Units per second
		private const float BaseSpeed = 15;
		private const float SpeedMultiplier = 1.5f;
		protected float Speed {
			get {
				return Modifications.Where(m => m.Properties.effect == ModEffect.Speed)
					.Aggregate(BaseSpeed, (current, speedMod) => current * speedMod.Properties.type switch {
						ModType.Buff => SpeedMultiplier,
						ModType.Nerf => 1 / SpeedMultiplier,
						_ => throw new ArgumentOutOfRangeException()
					});
			}
		}

		// Unit distance from zero
		private readonly float baseBorder = Dimensions.Singleton.Width / 2 * 0.9f;
		private readonly float borderSummand = Dimensions.Singleton.Width / 2 * 0.1f;
		protected float Border {
			get {
				return Mathf.Min(Modifications.Where(m => m.Properties.effect == ModEffect.Border)
						.Aggregate(baseBorder, (current, borderMod) => current + borderMod.Properties.type switch {
							ModType.Buff => borderSummand,
							ModType.Nerf => -borderSummand,
							_ => throw new ArgumentOutOfRangeException()
						}), 
					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();
			GameUI.Singleton.buttonDown += (side, direction) => {
				if (!side.Equals(Side))
					return;
				if (direction == "left")
					goingLeft = true;
				else
					goingRight = true;
			};
			GameUI.Singleton.buttonUp += (side, direction) => {
				if (!side.Equals(Side))
					return;
				if (direction == "left")
					goingLeft = false;
				else
					goingRight = false;
			};
		}
	}
	
	public class RealPlayer : Player {
		public bool isThisClient;
		
		private void FixedUpdate() {
			if (!isThisClient)
				return;

			if (Application.isEditor) {
				var keyboard = Keyboard.current;
				goingLeft = keyboard.aKey.isPressed;
				goingRight = keyboard.dKey.isPressed;
			}

			TryLinearMove(Time.fixedDeltaTime);
		}
	}
}