using Sandbox;
using System;
using System.Drawing;
using static Sandbox.VertexLayout;

[Perk( Rarity.Legendary, locked: true, minUnlocksReq: 2, alwaysOfferDebug: false )]
public class PerkXpStillGain : Perk
{
	private enum Mod { XpPerSecond, ReloadSpeedStill };

	private TimeSince _timeSinceHighlight;

	private GameObject _particlesGo;
	private ParticleEmitter _particleEmitter;

	// todo: every X seconds, Y chance to spawn an xp coin, + remove the non-animated logic for xp bar?

	private bool _isStill;

	static PerkXpStillGain()
	{
		Register<PerkXpStillGain>(
			name: "Researcher",
			imagePath: "textures/icons/vector/xp_still_gain.png",
			description: level => $"While not moving,\n+{GetValue( level, Mod.XpPerSecond ).ToString( "0.##" )} xp/s and -{GetValue( level, Mod.ReloadSpeedStill, true )}% reload speed",
			upgradeDescription: level => $"While not moving, +{GetValue( level - 1, Mod.XpPerSecond ).ToString( "0.##" )}→{GetValue( level, Mod.XpPerSecond ).ToString( "0.##" )} xp/s and -{GetValue( level - 1, Mod.ReloadSpeedStill, true )}%→-{GetValue( level, Mod.ReloadSpeedStill, true )}% reload speed"
		);
	}

	public override void Start()
	{
		base.Start();

		ShouldUpdate = true;

		HighlightColor = new Color( 0.3f, 0.3f, 1f );
		HighlightDuration = 0.25f;
		HighlightOpacity = 0.75f;

		DisplayCooldownColor = new Color( 0f, 0f, 0.5f, 0.3f );
		DisplayTextColor = new Color( 0.4f, 0.4f, 1f );

		_particlesGo = GameObject.Clone( "prefabs/effects/xp_still.prefab", new CloneConfig { StartEnabled = true, Parent = Player.GameObject } );
		_particlesGo.LocalPosition = new Vector3( 0f, 0f, 40f );

		_particleEmitter = _particlesGo.GetComponent<ParticleEmitter>();

		_isStill = true;
	}

	public override void Refresh()
	{
		base.Refresh();

		Player.Modify( this, PlayerStat.ReloadSpeedStill, GetValue( Level, Mod.ReloadSpeedStill ), ModifierType.Mult );
	}

	private static float GetValue( int level, Mod mod, bool isPercent = false )
	{
		switch ( mod )
		{
			case Mod.XpPerSecond:
			default:
				return 0.3f * level;
			case Mod.ReloadSpeedStill:
				return isPercent
					? 5f + 5f * level
					: 1f - (0.05f + 0.05f * level);
		}
	}

	private float _accumulatedXp;

	public override void Update( float dt )
	{
		base.Update( dt );

		if ( !Player.IsMoving )
		{
			var xp = GetValue( Level, Mod.XpPerSecond ) * Player.Stats[PlayerStat.XpGainMultiplier] * dt;

			if ( Manager.Instance.IsCommunismActive )
			{
				Manager.Instance.AddCommunismXp( xp, XpSource.Passive, spawnFloater: false, playSfx: false );

				// todo: floater?
			}
			else
			{
				Player.AddXp( xp, XpSource.Passive );

				_accumulatedXp += xp;
			}

			if( _timeSinceHighlight > 0.25f )
			{
				Highlight();
				_timeSinceHighlight = 0f;
			}

			if( _accumulatedXp > 1f )
			{
				_accumulatedXp -= 1f;

				var pos = Player.WorldPosition.WithZ( 60f );
				var color = new Color( 0.3f, 0.3f, 1f );
				float size = 1.3f;
				Manager.Instance.SpawnFloaterTextRpc( pos, $"1 XP", color, size, FloaterType.Xp );
			}

			if( !_isStill )
			{
				_isStill = true;

				ShowParticles();
			}
		}
		else
		{
			if ( _isStill )
			{
				_isStill = false;

				HideParticles();
			}
		}

		Player.Stats[PlayerStat.DisableXpBarTransition] = Player.IsMoving ? 0f : 1f;

		DisplayText = !Player.IsMoving ? $"+{GetValue( Level, Mod.XpPerSecond ).ToString( "0.#" )}" : " ";
		IconScale = 1f + (Utils.FastSin( RealTime.Now * 10f ) * 0.02f) * (Player.IsMoving ? 0f : 1f);
		DisplayCooldown = Player.IsMoving ? 0f : 1f;
		IconAngleOffset = Player.IsMoving ? 0f : Utils.FastSin( RealTime.Now * 5f ) * 3f;
	}

	void ShowParticles()
	{
		//if ( _particlesGo.IsValid() )
		//	_particlesGo.Enabled = true;

		if ( _particleEmitter.IsValid() )
			_particleEmitter.Enabled = true;
	}

	void HideParticles()
	{
		//if ( _particlesGo.IsValid() )
		//	_particlesGo.Enabled = false;

		if ( _particleEmitter.IsValid() )
			_particleEmitter.Enabled = false;
	}

	public override void Remove( bool restart = false )
	{
		base.Remove( restart );

		Player.Stats[PlayerStat.DisableXpBarTransition] = 0f;

		if ( _particlesGo.IsValid() )
			_particlesGo.Destroy();
	}

	public override void OnDie()
	{
		base.OnDie();

		HideParticles();
	}

	public override void OnRevive()
	{
		base.OnRevive();

		_isStill = true;

		ShowParticles();
	}
}