using System;
using Sandbox;

[Perk( Rarity.Epic, locked: true, alwaysOfferDebug: false, IncludedCategories = new[] { PerkCategory.ArcBullets })]
public class PerkKillArcBullet : Perk
{
	private enum Mod { Chance, };


	static PerkKillArcBullet()
	{
		Register<PerkKillArcBullet>(
			name: "Parting Shot",
			imagePath: "textures/icons/vector/kill_arc_bullet.png",
			description: level => $"[+]{GetValue( level, Mod.Chance, true )}%[/+] chance to lob a\nbullet-icon from enemies you kill",
			upgradeDescription: level => $"{GetValue( level - 1, Mod.Chance, true )}→{GetValue( level, Mod.Chance, true )}% chance to lob a\nbullet-icon from enemies you kill"
		);
	}

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

		HighlightColor = new Color( 1f, 0.7f, 0.4f );
		HighlightDuration = 0.15f;
		HighlightOpacity = 0.85f;
	}

	public override void OnKill( Enemy enemy, DamageType damageType, bool countsAsKill )
	{
		base.OnKill( enemy, damageType, countsAsKill );
		if ( !countsAsKill ) return;

		if ( Game.Random.Float( 0f, 1f ) < GetValue( Level, Mod.Chance ) )
		{
			var spawnOffset = 10f;
			var towardEnemy = (enemy.Position2D - Player.Position2D).Normal;
			var dir = Utils.GetRandomVectorInCone( towardEnemy, 200f );
			var pos = enemy.Position2D + dir * spawnOffset * Player.Stats[PlayerStat.Scale];
			var damage = Player.GetBulletDamage( isFromClip: false, isLastAmmo: false );
			var bullet = Player.SpawnBullet( pos, dir, damage, isFromClip: false );
			bullet.SetupArc( arcHeight: Game.Random.Float( 220f, 280f ), Player.Stats[PlayerStat.ArcBulletBounces] );
			bullet.Velocity *= Game.Random.Float( 0.05f, 0.25f );
			bullet.Stats[BulletStat.Lifetime] *= Game.Random.Float( 1.5f, 1.8f );

			Highlight();

			IconScale = Game.Random.Float( 1.075f, 1.1f );
			IconAngleOffset = Game.Random.Float( 5f, 9f ) * (Game.Random.Int( 0, 1 ) == 0 ? -1f : 1f);

			//Manager.Instance.PlaySfxNearbyRpc( "flick2", pos, pitch: Game.Random.Float(0.85f, 0.9f), volume: 0.9f, maxDist: 300f );
		}
	}

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