using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Terraria;
using Terraria.ID;
using Terraria.ModLoader;
using Terraria.GameContent;

namespace ForgottenWawiTech.Content.Projectiles
{
    // Short-lived beam projectile emitted rapidly by BeamAttackWand.
    // Simple straight projectile with minor dust and fade-out.
    public class BeamAttackWandBeam : ModProjectile
    {
        private const int FrameCount = 3;
        public override void SetStaticDefaults()
        {
            Main.projFrames[Type] = FrameCount; // 3 vertical frames
        }

        public override void SetDefaults()
        {
            Projectile.width = 28; // frame width
            Projectile.height = 28; // frame height
            Projectile.friendly = true;
            Projectile.penetrate = 1; // single hit per beam
            Projectile.timeLeft = 15; // very short duration
            Projectile.DamageType = DamageClass.Melee;
            Projectile.tileCollide = true;
            Projectile.light = 0.4f;
            Projectile.alpha = 40;
        }

        public override void AI()
        {
            // Frame animation: advance every 4 ticks for subtle flicker
            Projectile.frameCounter++;
            if (Projectile.frameCounter >= 4)
            {
                Projectile.frameCounter = 0;
                Projectile.frame = (Projectile.frame + 1) % FrameCount;
            }

            // Slight acceleration forward for a snappy feel
            Projectile.velocity *= 1.02f;

            // Simple fade: become more transparent near end
            if (Projectile.timeLeft < 6)
                Projectile.alpha += 25;

            // Spawn light dust
            if (Main.rand.NextBool(3))
            {
                int d = Dust.NewDust(Projectile.position, Projectile.width, Projectile.height, DustID.PurpleTorch,
                    Projectile.velocity.X * 0.2f, Projectile.velocity.Y * 0.2f, 150, default, 0.9f);
                Main.dust[d].noGravity = true;
            }
        }

        public override bool OnTileCollide(Vector2 oldVelocity)
        {
            // So beams feel crisp: slight bounce spark then die
            Projectile.timeLeft = 5;
            Projectile.velocity *= 0.4f;
            return false; // don't kill immediately; fade
        }

        public override bool PreDraw(ref Color lightColor)
        {
            Texture2D tex = TextureAssets.Projectile[Type].Value;
            int frameHeight = tex.Height / FrameCount;
            Rectangle frameRect = new(0, frameHeight * Projectile.frame, tex.Width, frameHeight);
            Vector2 origin = new(tex.Width / 2f, frameHeight / 2f);
            float baseScale = 1f;
            float stretchX = 0.6f + Projectile.velocity.Length() / 30f; // elongate horizontally
            Color drawColor = Color.White * (1f - Projectile.alpha / 255f);

            // Slight additive trail effect: draw faint previous frame positions
            for (int i = 0; i < 3; i++)
            {
                Vector2 trailPos = Projectile.Center - Projectile.velocity * i * 0.8f;
                float trailAlpha = (0.4f - i * 0.12f) * (1f - Projectile.alpha / 255f);
                Main.EntitySpriteDraw(tex, trailPos - Main.screenPosition, frameRect,
                    drawColor * trailAlpha, Projectile.rotation, origin,
                    new Vector2(stretchX, baseScale), SpriteEffects.None);
            }

            // Main frame (bright)
            Main.EntitySpriteDraw(tex, Projectile.Center - Main.screenPosition, frameRect,
                drawColor, Projectile.rotation, origin,
                new Vector2(stretchX, baseScale), SpriteEffects.None);
            return false;
        }
    }
}