using Sandbox;

[Library( "weapon_flashlight", Title = "Flashlight", Spawnable = true )]
partial class Flashlight : Weapon
{
	public override string ViewModelPath => "weapons/rust_flashlight/v_rust_flashlight.vmdl";
	public override float SecondaryRate => 2.0f;

	protected virtual Vector3 LightOffset => Vector3.Forward * 10;

	private SpotLightEntity worldLight;
	private SpotLightEntity viewLight;

	[Net, Local, Predicted]
	private bool LightEnabled { get; set; } = true;

	TimeSince timeSinceLightToggled;

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

		SetModel( "weapons/rust_pistol/rust_pistol.vmdl" );

		worldLight = CreateLight();
		worldLight.SetParent( this, "slide", new Transform( LightOffset ) );
		worldLight.EnableHideInFirstPerson = true;
		worldLight.Enabled = false;
	}

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

		viewLight = CreateLight();
		viewLight.SetParent( ViewModelEntity, "light", new Transform( LightOffset ) );
		viewLight.EnableViewmodelRendering = true;
		viewLight.Enabled = LightEnabled;
	}

	private SpotLightEntity CreateLight()
	{
		var light = new SpotLightEntity
		{
			Enabled = true,
			DynamicShadows = true,
			Range = 512,
			Falloff = 1.0f,
			LinearAttenuation = 0.0f,
			QuadraticAttenuation = 1.0f,
			Brightness = 2,
			Color = Color.White,
			InnerConeAngle = 20,
			OuterConeAngle = 40,
			FogStength = 1.0f,
			Owner = Owner,
		};

		light.UseFog();

		return light;
	}

	public override void Simulate( Client cl )
	{
		if ( cl == null )
			return;

		base.Simulate( cl );

		bool toggle = Input.Pressed( InputButton.Flashlight ) || Input.Pressed( InputButton.Attack1 );

		if ( timeSinceLightToggled > 0.1f && toggle )
		{
			LightEnabled = !LightEnabled;

			PlaySound( LightEnabled ? "flashlight-on" : "flashlight-off" );

			if ( worldLight.IsValid() )
			{
				worldLight.Enabled = LightEnabled;
			}

			if ( viewLight.IsValid() )
			{
				viewLight.Enabled = LightEnabled;
			}

			timeSinceLightToggled = 0;
		}
	}

	public override bool CanReload()
	{
		return false;
	}

	public override void AttackSecondary()
	{
		if ( MeleeAttack() )
		{
			OnMeleeHit();
		}
		else
		{
			OnMeleeMiss();
		}

		PlaySound( "rust_flashlight.attack" );
	}

	private bool MeleeAttack()
	{
		var forward = Owner.EyeRot.Forward;
		forward = forward.Normal;

		bool hit = false;

		foreach ( var tr in TraceBullet( Owner.EyePos, Owner.EyePos + forward * 80, 20.0f ) )
		{
			if ( !tr.Entity.IsValid() ) continue;

			tr.Surface.DoBulletImpact( tr );

			hit = true;

			if ( !IsServer ) continue;

			using ( Prediction.Off() )
			{
				var damageInfo = DamageInfo.FromBullet( tr.EndPos, forward * 100, 25 )
					.UsingTraceResult( tr )
					.WithAttacker( Owner )
					.WithWeapon( this );

				tr.Entity.TakeDamage( damageInfo );
			}
		}

		return hit;
	}

	[ClientRpc]
	private void OnMeleeMiss()
	{
		Host.AssertClient();

		if ( IsLocalPawn )
		{
			_ = new Sandbox.ScreenShake.Perlin();
		}

		ViewModelEntity?.SetAnimBool( "attack", true );
	}

	[ClientRpc]
	private void OnMeleeHit()
	{
		Host.AssertClient();

		if ( IsLocalPawn )
		{
			_ = new Sandbox.ScreenShake.Perlin( 1.0f, 1.0f, 3.0f );
		}

		ViewModelEntity?.SetAnimBool( "attack_hit", true );
	}

	private void Activate()
	{
		if ( worldLight.IsValid() )
		{
			worldLight.Enabled = LightEnabled;
		}
	}

	private void Deactivate()
	{
		if ( worldLight.IsValid() )
		{
			worldLight.Enabled = false;
		}
	}

	public override void ActiveStart( Entity ent )
	{
		base.ActiveStart( ent );

		if ( IsServer )
		{
			Activate();
		}
	}

	public override void ActiveEnd( Entity ent, bool dropped )
	{
		base.ActiveEnd( ent, dropped );

		if ( IsServer )
		{
			if ( dropped )
			{
				Activate();
			}
			else
			{
				Deactivate();
			}
		}
	}
}