using Sandbox;
using System;

public sealed class BloodSprayer : Component
{
	[Property] public ParticleEmitter Emitter { get; set; }
	[Property] public ParticleEffect ParticleEffect { get; set; }

	private TimeSince _timeSinceSpawn;
	private float _bloodRateStart;

	private float _bloodStartTime;
	private float _bloodStopTime;
	private EasingType _bloodEasingType;

	private ModelRenderer _parentRenderer;

	public bool StopSpraying { get; set; } = false;

	protected override void OnStart()
	{
		base.OnStart();

		Emitter.Rate = 0f;
		_timeSinceSpawn = 0f;
		_bloodStartTime = Game.Random.Float( 0.15f, 0.4f );
		_bloodStopTime = Game.Random.Float( 1.5f, 5f );
		_bloodRateStart = Game.Random.Float( 8f, 50f );

		int rand = Game.Random.Int( 0, 5 );
		switch( rand )
		{
			case 0: _bloodEasingType = EasingType.SineOut; break;
			case 1: _bloodEasingType = EasingType.SineOut; break;
			case 2: _bloodEasingType = EasingType.Linear; break;
			case 3: _bloodEasingType = EasingType.Linear; break;
			case 4: _bloodEasingType = EasingType.SineIn; break;
			case 5: _bloodEasingType = EasingType.QuadIn; break;
		}

		if ( GameObject.Parent == null )
			return;

		//var gibFader = GameObject.Parent.GetComponent<GibFader>();
		//gibFader.BloodSprayer = this;

		_parentRenderer = GameObject.Parent.GetComponent<ModelRenderer>();
	}

	protected override void OnUpdate()
	{
		if ( StopSpraying || !_parentRenderer.IsValid() )
			return;

		//Gizmo.Draw.Color = Color.White;
		//Gizmo.Draw.Text( $"{_timeSinceSpawn} / {_bloodStopTime}\n{Emitter.Rate.ConstantValue}\nparentAlpha: {parentAlpha}", new global::Transform( WorldPosition ) );

		if ( _timeSinceSpawn > _bloodStartTime )
		{
			Emitter.Rate = Utils.Map(_timeSinceSpawn, _bloodStartTime, _bloodStopTime, _bloodRateStart, 0f, _bloodEasingType );
		}

		//Log.Info($"Emitter.Rate: {Emitter.Rate.ConstantValue}" );

		ParticleEffect.Gradient = ParticleEffect.Gradient.ConstantValue.WithAlpha( MathX.Clamp( Utils.Map( _parentRenderer.Tint.a, 1f, 0f, 1f, 0f, EasingType.QuadIn ), 0f, 1f ) );

		//ParticleEffect.Gradient = Color.Lerp( Color.Red, Color.Blue, Utils.Map( parentAlpha, 1f, 0f, 0f, 1f ) );
	}

	public static void OnParticleHitGround( Particle particle )
	{
		if ( Game.IsEditor && !Game.IsPlaying ) // necessary?
			return;

		if ( particle.Position.z > 10f )
			return;

		var vel2D = new Vector2( particle.Velocity.x, particle.Velocity.y );
		float yaw = Utils.GetAngleDegreesFromVectorAlt( vel2D );

		//Log.Info( $"{(Vector2)particle.Velocity} --  yaw: {yaw}" );

		var sidewaysSpeed = vel2D.Length;
		//Log.Info( $"sidewaysSpeed: {sidewaysSpeed}" );
		float skew = Utils.Map( sidewaysSpeed, 0f, 1000f, 1f, Game.Random.Float(2f, 2.5f), EasingType.SineIn );

		var pos = new Vector3( particle.Position.x, particle.Position.y, MathF.Min( particle.Position.z, 5f ) + 0.5f );
		var rot = new Angles( 90f, yaw, 0f );
		//var scale = Game.Random.Float( 0.3f, 0.45f );
		var scale = Game.Random.Float( 0.4f, 0.45f );
		//scale = 1f;
		var bloodDecalSplatGo = GameObject.Clone( "prefabs/effects/decal_blood_splat.prefab", new global::Transform( pos, rot, new Vector3( 2f, scale * skew, scale ) ) );
		var bloodDecalSplat = bloodDecalSplatGo.GetComponent<BloodSplatDecal>();
		bloodDecalSplat.Lifetime = Game.Random.Float( 2.25f, 3.25f ) * Utils.Map( Manager.Instance.NumEnemies, 0, 120, 2f, 0.75f );
		bloodDecalSplat.FullAlpha = MathX.Clamp( particle.Color.a, 0f, 1f );

		//Gizmo.Draw.Color = Color.White;
		//Gizmo.Draw.Line(particle.Position, particle.Position - particle.Velocity * 50f);
		//Log.Info( $"vel2D: {vel2D} velZ: {particle.Velocity.z} horizontalness: {vel2D.Length / particle.Velocity.z}" );

		//Log.Info( $"OnParticleHitGround: {particle.Velocity}" );
		//Log.Info( $"particle.Color: {particle.Color}" );
	}

	public void StopSprayingBlood()
	{
		StopSpraying = true;
		Emitter.Rate = 0f;
	}
}