using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using Unity.Netcode;
using UnityEngine;
using UnityEngine.UIElements;

namespace Game {

	public enum Side { Top, Bottom }

	public class Player : NetworkBehaviour {
		
		private const float BaseSpeed = 15;
		private const float SpeedMultiplier = 1.5f;

		// Unit distance from zero
		private readonly float baseBorder = Dimensions.Singleton.PlaySize.x / 2 * 0.85f;
		private readonly float borderSummand = Dimensions.Singleton.PlaySize.x / 2 * 0.15f;

		private const float BaseWidth = 6;
		private const float WidthMultiplier = 1.5f;

		protected bool goingLeft, goingRight;

		public Side Side { get; set; }

		private VisualElement Panel { get; set; }

		private List<ModificationProperties> Modifications { get; } = new();

		private int Score { get; set; }

		private float GetModified(ModEffect effect, float baseValue, float modValue, Func<float, float, float> combineFunc, Func<float, float> invertFunc) {
			return Modifications.Where(m => m.effect == effect)
				.Aggregate(baseValue,
					(current, mod) => combineFunc(current, mod.type switch {
						ModType.Buff => modValue,
						ModType.Nerf => invertFunc(modValue),
						_ => throw new ArgumentOutOfRangeException()
					})
				);
		}

		protected float Speed {
			get {
				float value = GetModified(ModEffect.Speed, BaseSpeed, SpeedMultiplier, (f, f1) => f * f1, f => 1 / f);
				return value;
			}
		}
		protected float Border {
			get {
				float value = GetModified(ModEffect.Border, baseBorder, borderSummand, (f, f1) => f + f1, f => -f);
				return Mathf.Clamp(value, Width / 2, Dimensions.Singleton.PlaySize.x / 2);
			}
		}

		protected float Width {
			get {
				float value = GetModified(ModEffect.Width, BaseWidth, WidthMultiplier, (f, f1) => f * f1, f => 1 / f);
				return Mathf.Clamp(value, 0.1f, Dimensions.Singleton.PlaySize.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;

		private void Update() {
			transform.localScale = new Vector3(Width, 1, 1);
		}

		protected void Start() {
			var y = Side switch {
				Side.Bottom => -Dimensions.Singleton.PlaySizeBoards.y / 2,
				Side.Top => Dimensions.Singleton.PlaySizeBoards.y / 2,
				_ => throw new ArgumentOutOfRangeException()
			};
			transform.position = new Vector2(0, y);
			if (Side == Side.Top)
				transform.Rotate(transform.forward, 180);
			Panel = GameUI.Singleton.PlayerPanel(Side);
			UpdatePanel();
		}

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

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

		public IEnumerator ProcessModification(ModificationProperties properties) {
			Modifications.Add(properties);
			var element = GameUI.AddModification(Panel, properties);

			var doNothingTime = properties.activeDuration * 0.7f;
			var animateTime = properties.activeDuration * 0.3f;

			yield return new WaitForSeconds(doNothingTime);

			float current = 0;
			while (current < animateTime) {
				current += Time.deltaTime;
				element.style.opacity = new StyleFloat(1 - current / animateTime);
				yield return null;
			}

			element.RemoveFromHierarchy();
			Modifications.Remove(properties);
		}


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