using Sandbox;
using System;
using System.Numerics;

[Perk( Rarity.Epic, locked: true, minUnlocksReq: 2, alwaysOfferDebug: false, IncludedCategories = new[] { PerkCategory.Aoe })]
public class PerkAcidBlood : Perk
{
	private enum Mod { DmgPercent, Cooldown };

	private TimeSince _timeSinceBlood;

	private bool _isActive;

	private GameObject _particlesGo;
	private ParticleEffect _particleEffect;
	private ParticleEmitter _particleEmitter;

	static PerkAcidBlood()
	{
		Register<PerkAcidBlood>(
			name: "Acid Blood",
			imagePath: "textures/icons/vector/acid_blood.png",
			description: level => $"When hit, spawn acid that\ndoes {(int)GetValue( level, Mod.DmgPercent, true )}% of the hit's dmg\n(cooldown: {GetValue( level, Mod.Cooldown )}s)",
			upgradeDescription: level => $"When hit, spawn acid that\ndoes {(int)GetValue( level - 1, Mod.DmgPercent, true )}%→{(int)GetValue( level, Mod.DmgPercent, true )}% of the hit's dmg\n(cooldown: {GetValue( level - 1, Mod.Cooldown )}→{GetValue( level, Mod.Cooldown )}s)"
		);
	}

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

		DisplayCooldownColor = new Color( 0.7f, 0.7f, 1f, 0.5f );

		_particlesGo = GameObject.Clone( "prefabs/effects/acid_blood.prefab", new CloneConfig { StartEnabled = true, Parent = Player.GameObject } );
		_particlesGo.LocalPosition = new Vector3( 0f, 0f, 35f );

		_particleEffect = _particlesGo.GetComponent<ParticleEffect>();
		_particleEmitter = _particlesGo.GetComponent<ParticleEmitter>();
	}

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

		BecomeReady();
	}

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

	}

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

		var cooldown = GetValue( Level, Mod.Cooldown );
		if ( _timeSinceBlood > cooldown )
		{
			BecomeReady();
		}
		else
		{
			DisplayCooldown = Utils.Map( _timeSinceBlood, 0f, cooldown, 1f, 0f );
		}
	}

	private static float GetValue( int level, Mod mod, bool isPercent = false )
	{
		switch ( mod )
		{
			case Mod.DmgPercent:
			default:
				return isPercent
					? 25f * level
					: 0.25f * level;
			case Mod.Cooldown:
				return 14f - level * 2f;
		}
	}

	public override void OnHit( float amount, DamageType damageType, bool isSelfInflicted, Vector2 dir, float force, Enemy enemySource, EnemyType enemyType, float previousHealth )
	{
		base.OnHit( amount, damageType, isSelfInflicted, dir, force, enemySource, enemyType, previousHealth );

		if ( damageType == DamageType.Self )
			return;

		if ( !_isActive )
			return;

		var dmg = Math.Max( amount * GetValue( Level, Mod.DmgPercent ), 1f );

		var pos = Player.Position2D - dir * Player.Radius;
		var scale = 1.5f * Player.Stats[PlayerStat.RadiusMultiplier];
		var lifetime = Game.Random.Float( 10f, 11f );
		Manager.Instance.SpawnAcidPuddleRpc( pos, lifetime, dmg, scale, new Color( 0.1f, 0.2f, 0.6f ), new Color( 0.3f, 0.3f, 0.9f ),
			damagePlayers: false, damageEnemies: true, playerSource: Player, enemySource: null, enemyType: EnemyType.None );

		_timeSinceBlood = 0f;

		HighlightColor = new Color( 0.3f, 0.4f, 1f );
		HighlightDuration = 0.3f;
		HighlightOpacity = 4f;
		Highlight();

		IconScale = Game.Random.Float( 1.2f, 1.3f );
		IconAngleOffset = Game.Random.Float( 10f, 20f ) * (Game.Random.Int( 0, 1 ) == 0 ? -1f : 1f);

		// todo: sfx

		BecomeNotReady();
	}

	void BecomeReady()
	{
		_isActive = true;
		DisplayCooldown = 0f;
		ShouldUpdate = false;

		HighlightColor = new Color( 0.5f, 0.5f, 1f );
		HighlightDuration = 0.2f;
		HighlightOpacity = 2f;
		Highlight();

		IconScale = Game.Random.Float( 1.05f, 1.1f );
		IconAngleOffset = Game.Random.Float( 3f, 6f ) * (Game.Random.Int( 0, 1 ) == 0 ? -1f : 1f);

		if ( _particlesGo.IsValid() )
			_particlesGo.Enabled = true;

		Player.ScaleHeightRpc( amount: 1.5f, time: Game.Random.Float( 0.05f, 0.06f ) );

		// todo: sfx
	}

	void BecomeNotReady()
	{
		_isActive = false;
		ShouldUpdate = true;
		DisplayCooldown = 1f;

		if ( _particleEmitter.IsValid() && _particleEffect.IsValid() )
			_particleEmitter.Emit( _particleEffect );

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

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

		BecomeNotReady();
	}

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

		BecomeNotReady();
	}

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

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