alien-attack/AlientAttack.MonoGame/Things/Enemies/TealEnemy.cs

using AlienAttack.MonoGame.Things.Bullets;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Audio;
using Microsoft.Xna.Framework.Graphics;

namespace AlienAttack.MonoGame.Things.Enemies;

internal class TealEnemy : EnemyShip
{
    protected int FireThreshold => 20;
    protected int CurrentFireThreshold { get; set; } = 20;
    protected int Health { get; set; } = 5;

    public TealEnemy(int x, int y) : base(x, y)
    {
        BoundBox = new Rectangle(0, 0, 64, 64);
        YVelocity = 1;
        XVelocity = 3;
    }

    public override void Draw(SpriteDrawArgs args)
    {
        int frame = XVelocity > 0 ? 2 : XVelocity < 0 ? 3 : 1;
        SpriteEffects spriteEffects = XVelocity > 0 ? SpriteEffects.FlipHorizontally : SpriteEffects.None;
        Texture2D texture = args.Content.Load<Texture2D>(@$"Sprites\Enemy01_Teal_Frame_{frame}_png_processed");
        //SpriteEffects spriteEffects = SpriteEffects.None;

        args.SpriteBatch.Draw(texture, Position, null, DrawColor, 0, new Vector2(0, 0), 1, spriteEffects, 1);

        base.Draw(args);
    }

    public override void Update(SpriteUpdateContext context)
    {
        if (XPosition + BoundBox.Width >= context.ViewTransform.ScreenWidth)
        {
            XPosition = context.ViewTransform.ScreenWidth - BoundBox.Width;
            XVelocity *= -1;
        }
        else if (XPosition <= 0)
        {
            XPosition = 0;
            XVelocity *= -1;
        }

        if (Health <= 0)
        {
            IsDead = true;
            SpawnExplosion(context);
            return;
        }

        if (YPosition > context.ViewTransform.ScreenHeight)
        {
            IsDead = true;
            return;
        }

        //CheckMove(context);
        TryFire(context);

        base.Update(context);
    }

    private void SpawnExplosion(SpriteUpdateContext context)
    {
        context.SpawnSprite(new Explosion((int)XPosition, (int)YPosition, XVelocity, YVelocity));

        //int number = context.Random.Next(1, 7);

        //SoundEffect soundEffect = context.Content.Load<SoundEffect>(@$"Sfx\Explosions\EXPLDsgn_Explosion Impact_0{number}_SFRMS_SCIWPNS");
        //soundEffect.Play(0.95f, (float)(context.Random.NextDouble() * 0.1 - 0.05), 0);

        context.AudioManager.PlayExplosion();
    }

    private void TryFire(SpriteUpdateContext context)
    {
        if (CurrentFireThreshold > 0)
        {
            CurrentFireThreshold--;
        }

        if (CurrentFireThreshold == 0 && context.Random.Next(0, 50) == 1)
        {
            float originX = XPosition + (BoundBox.Width / 2) - (7 / 2);

            context.SpawnSprite(new MinigunBulletSmall(originX - 9, YPosition + BoundBox.Height - 12, 0, 2 + YVelocity, this));
            context.SpawnSprite(new MinigunBulletSmall(originX + 14, YPosition + BoundBox.Height - 12, 0, 2 + YVelocity, this));

            CurrentFireThreshold = FireThreshold;

            context.AudioManager.PlayEnemyFire();
        }
    }

    public override void OnCollision(SpriteCollisionContext context)
    {
        if (context.Sprite is Bullet bullet && bullet.Owner is Player)
        {
            Health -= bullet.Damage;
        }

        if (context.Sprite is Player)
        {
            Health = 0;
        }
    }
}